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| − | == TUTORIAL QUESTIONS ==
| + | Check out the [[Finding cluster members]] page for information about why light curves are beneficial. Also see [[Monitoring young stars]], which is a general introduction to, well, monitoring young stars. |
| − | ''X-Dani-''
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| − | 1) is it giong to be interactive or informational?
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| − | a) are people going to be able to "plug in" the information and it's going to spit out a light curve?
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| − | b) is it just going to be a "follow along paper" telling them how to do it step by step?
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| − | == practice light curve data ==
| + | ''Click on the "discussion" tab above to find the conversations about this.'' |
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| − | ''....DANIELLEYEAGER.. 11/15/2007_23:55EST
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| | + | --[[User:Rebull|Rebull]] 10:22, 19 December 2007 (PST) Hi guys - i still think it makes sense to have some overview information here, even if you really really really want to keep all the conversations on the 'talk' page.... so put in some stuff here about the big picture -- you have a link to the finding cluster members page, and that's great. but you might also add stuff on, for example, frequently asked questions that you're asking each other during this process. Again, think of yourselves as mentors to the students in California and maybe Texas who will also be working on this project. You need to put enough information here so that they can join in your conversation, or at least understand what it is that you are doing. cheers, luisa [END] |
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| − | Would you like our practice light curves posted on here? If so, do you want our entire spread sheets as well as the graph; or just one or the other?........''
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| − | RESPONSE: Dani, yes if you can post them here that would be great. Thanks, Mr. Spuck
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| − | == practice light curve .... == | + | ='''Q & A'''= |
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| | + | Q - ''Why are light curves important?'' |
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| | + | A - '''Light curves help to determine variability and rotation rates, both of which can help to determine whether or not candidates are indeed T-Tauri stars.''' |
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| − | '''''........DANIELLEYEAGER.... 11/19/07 15:11EST'''''
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| − | today during 7th period mr.spuck pulled the IC2118 group aside and discussed how far we had gotten with the practice light curve and the wiki.
| + | Q - ''What is the difference between magnitude and intensity?'' |
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| − | i am almost done with my light curve. i used the HOU [hands on universe] program to collect my data. fast and easy. However, there were only 4 constants in the images, two of which being my targets. once I create the spread sheets along with the graph, I will try to find a way to get them on here along with a step by step on how I did it.
| + | A - '''Magnitude and Intensity are both measurenments of brightness.''' |
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| − | '''''15:22EST'''''
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| − | mr.spuck saved a file into the practice folder showing 13 reference points, he also posted them on the wiki in section 17 of the discussion. i'm going to have to go back into my data and force HOU to spit out that information.
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| − | '''''[END]'''''
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| − | == Location of image files for practice light curve .... ==
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| − | '''''........Spuck.... 11/19/07 15:30EST'''''
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| − | All image files are locatde here: http://web.ipac.caltech.edu/staff/rebull/ic2118/monitoring/
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| − | == X,Y postion of YSO targets and REF objects in images .... ==
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| − | '''''........Spuck.... 11/19/07 15:30EST'''''
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| − | Using MaxIm DL or Hands On Universe Image Processing Software
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| − | These are the image coordinates for the two YSO targets and 13 common reference objects in the practice light curve data set.
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| − | X Y
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| − | YSO 1: 176, 182 +/- 3 pixels
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| − | YSO 2: 179, 144 +/- 3 pixels
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| − | REF 1: 52, 436 +/- 3 pixels
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| − | REF 2: 94, 124 +/- 3 pixels
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| − | REF 3: 99, 222 +/- 3 pixels
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| − | REF 4: 129, 399 +/- 3 pixels
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| − | REF 5: 131, 309 +/- 3 pixels
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| − | REF 6: 156, 23 +/- 3 pixels
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| − | REF 7: 164, 286 +/- 3 pixels
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| − | REF 8: 201, 35 +/- 3 pixels
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| − | REF 9: 213, 295 +/- 3 pixels
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| − | REF 10: 220, 304 +/- 3 pixels
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| − | REF 11: 290, 36 +/- 3 pixels
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| − | REF 12: 379, 449 +/- 3 pixels
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| − | REF 13: 428, 359 +/- 3 pixels
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| − | == 11-27-17_1333EST ==
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| − | .............DANIELLEYEAGER.....
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| − | FIRST ATTEMPT AT POSTING PRACTICE LIGHT CURVE.
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| − | note... to load in picture, must upload file to wiki then recall.
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| − | data table
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| − | DATE------------------A------B-------C-------D----RATIO--RATIO C--RATIO D
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| − | 03-13-0803-002...818..1510..5207..8083...1164......4.47.......6.94
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| − | 03-13-0803-001...869..1429..5144..8316...1149......4.48.......7.76
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| − | 03-09-0848-001...760..2853..8800..17440..1806.5....4.73.......9.65
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| − | 03-09-0844-001...727..1024..3927..7418...884.5.....4.44.......8.39
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| − | 03-09-0806-001...976..911...4144..7703...943.5.....4.39.......8.16
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| − | 03-16-0803-001..1271..1179..5153..7797...1225......4.21.......6.36
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| − | 03-15-0810-002..1046..1340..3302..8867...1193......2.77.......7.43
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| − | 03-14-0800-003..1721..2731..10831..19584..2226......4.87......8.8
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| − | 03-14-0800-002..1028..700...5026...8916...864.......5.82.....10.32
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| − | 03-14-0800-001..1158..658...4760...8565...908.......5.24......9.43
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| − | 03-13-0803-003...942..1634..5424...7877...1288......4.21......6.12
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| − | revised data table
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| − | DATE----------------RATIO C-----RATIO D
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| − | 03-13-0803-002----- 4.47----- 6.94
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| − | 03-13-0803-001----- 4.48----- 7.76
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| − | 03-09-0848-001----- 4.73----- 9.65
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| − | 03-09-0844-001----- 4.44----- 8.39
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| − | 03-09-0806-001----- 4.39----- 8.16
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| − | 03-16-0803-001----- 4.21----- 6.36
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| − | 03-15-0810-002----- 2.77----- 7.43
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| − | 03-14-0800-003----- 4.87----- 8.8
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| − | 03-14-0800-002----- 5.82----- 10.32
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| − | 03-14-0800-001----- 5.24----- 9.43
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| − | 03-13-0803-003----- 4.21----- 6.12
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| − | [[Image:GRAPH.jpg]]
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| − | GRAPH IS IMAGE LOADED INTO PHOTOBUCKET.COM AND THEN SAVED TO THE WIKI AS GRAPH.JPG.... THIS IS THE ONLY SOLUTION I COULD COME UP WITH AS TO POSTING A PICTURE OF THE GRAPH. ANY IDEAS OR OTHER OPTIONS??
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| − | .......11/30/07 1017est......... okay, so I made a really REALLY beginner mistake and completly forgot about the fact that I had to use julian date. SOOO.. I will post a new thread with the updated information.
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| − | .....11/30/07 1042EST.............. i guess it's just a day for mistakes. i was using the file image name rather than the date and time from the header. so, i have to do the dates over again AND THEN convert into julian time.
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| − | [END OF DANIELLEYEAGER POST]
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| − | --[[User:Spuck|Spuck]] 10:45, 4 December 2007 (PST) Dani, when you write ratio C and ratio D, what do you mean? You are dividing what by what? Also, did you follow the directions from the activity we are working showing you how to generate a light curve. In the activity one of the things you are asked to do is convert to Julian time.
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| − | --[[User:Danielle|Dani]] 10:49, 4 December 2007 (PST) TSpuck, Ratio C means the Candidate C divided by the average of the references. Ratio D means the Candidate D divided by the average of the references. And no, I did not use the activity worksheet. [end]
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| − | == Practice Light Curve and Loop Problem ==
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| − | ..............DANIELLEYEAGER 11/30/07 1336EST
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| − | After figuring the Julian Date for the data, the light curve started to loop. By loop, I mean that the dates stacked fairly close to right above one another and circled through them forming a loop. By this loop problem, I've made the assumption that if a set of data has several points that are seconds or minutes apart, the data will loop. To solve the loop problem I averaged together the points that formed the loop and had that as my point. Doing so decreased my data points severely, but did work in achieving my desired goal.
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| − | NOTE .... when uploading pictures make sure to use EXACT title. example.. if the file name is uploaded as graph2.JPG you must type exactly, example capatalizing the JPG.
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| − | NEW DATA TABLE AND GRAPH
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| − | JULIAN DATE..... RATIO C..... RATIO D
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| − | 2454168.838........ 4.52............ 8.73
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| − | 2454172.835........ 4.386...........6.94
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| − | 2454173.833........ 5.31............ 9.52
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| − | 2454174.84.......... 2.77............ 7.43
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| − | 2454175.835........ 4.21............ 6.36
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| − | [[Image:graph2.JPG]]
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| − | --[[User:Spuck|Spuck]] 11:03, 4 December 2007 (PST) Dani, Can you double check the last two data points on your graph (2454174.84 and 2454175.835)? The curves seem to match up except for one of these two sets.
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| − | Also, does anyone know how to set up a graph in excel so that you only connect some of the data points being graphed? Thanks.
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| − | [END OF DANIELLYEAGER POST]
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| − | == Matt's Light Curve using Beth Thomas's Method==
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| − | [[Image:Matt.JPG]]
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| − | HJD YSO 1 in R YSO 1 in I
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| − | 2454168.838______7703________17560
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| − | 2454172.833______7418________17440
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| − | 2454174.844______8038________19293
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| − | 2454175.835______7869________19316
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| − | 2454177 856______8565________18534
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| − | 2454178 8820_____8820________19204
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| − | 2454179 8820_____8820________18871
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| − | 2454180 8820_____8258________18534
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| − | 2454181 8258_____7820________18310
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| − | 2454182 7820_____7708________18729
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| − | == Practice curve ==
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| − | Nick's light curve, 12/04/07 1:34
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| − | Julian Date Ratio 1 Ratio 2
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| − | 2454172.835 4.4 7
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| − | 2454173.833 5.3 9.5
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| − | 2454174.843 3.6 7.2
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| − | 2454175.835 4.2 6.4
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| − | [[Image:Graph3.JPG]]
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| − | Once again Perth is down.
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| − | --[[User:Spuck|Spuck]] 11:39, 4 December 2007 (PST) Nick, Perth will probably be down for a bit. See my previous post to Dani. Also, your light curve looks similar to Dani's. That's good and bad. :) Can you check with Dani and answer the following question for me and then post your responses:
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| − | 1. Did the two of you use all the same reference stars?
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| − | 2. Did the two of you use the same software to get the brightness values for your reference stars and YSO candidates?
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| − | Also, I'd like to se you modify your graph a bit. Label the Y axis more clearly (don't just say ratio ... ratio of what?). Also, turn the julian dates (ie. like I had Dani do hers). And use the scatter plot with the line connecting the data points. Also correct your spelling error in the graph title. Thanks.
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| − | --[[User:Nicholas|Nicholas]] 10:36, 6 December 2007 (PST) Well Mr. Spuck Dani walked me through what to do with the Light Curve so it would be understandable why our light curves would be similar. [end]
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| − | --[[User:Danielle|DanielleYeager]] 09:59, 7 December 2007 (PST) 1.) I don't know if we used the same reference stars, but I do know that he used MORE reference stars than I did.
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| − | 2.) I used HOU.
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| − | == Light Curve Correction ==
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| − | --[[User:Danielle|DanielleYeager]] 10:44, 7 December 2007 (PST) In study of both Nick's and my own light curve, we have discovered why the peaks are not matching up. The graphs show two different candidates rather than two different filters for the same candidate. Both light curves need redone, focusing on one candidate in both the I and the R filters. Each graph needs to show the I and R light curve for one candidate. [end]
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| − | == Nick's Project ==
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| − | --[[User:Nicholas|NicholasJamesKelley]] 10:17, 11 December 2007 (PST)This area will be used to show the current progress I am making toward proving that Candidates 415 and 416 are T-Tauri Stars.
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| − | --[[User:Nicholas|NicholasJamesKelley]] 10:47, 7 December 2007 (PST) These are my light curves for the 2 candidates that I am monitoring for Spitzer and the Sceince fair. I am currently monitoring to get more accurate curves to take with me.
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| − | Candidate
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| − | 415 Julian Date I Ratio R Ratio
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| − | 12-Feb 2454144.168 1.20
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| − | 21-Feb 2454153.051 1.32 0.6
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| − | 22-Feb 2454154.144 1.6 0.63
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| − | 23-Feb 2454155.121 1.76 0.84
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| − | 27-Feb 2454158.9 1.27 0.53
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| − | 6-Mar 2454166.035 1.33 0.56
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| − | 9-Mar 2454169.047 1.66 0.73
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| − | 11-Mar 2454171.074 1.49 0.68
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| − | 12-Mar 2454172.013 1.5 0.65
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| − | 16-Mar 2454176.01 0.96 0.45
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| − | [[Image:415.JPG]]
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| − | Candidate
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| − | 416 Julian Date I ratio R ratio
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| − | 12-Feb 2454144.168 3
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| − | 21-Feb 2454153.051 3.04 1.3
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| − | 22-Feb 2454154.144 3.06 1.19
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| − | 23-Feb 2454155.121 2.86 1.31
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| − | 27-Feb 2454158.9 3.24 1.4
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| − | 6-Mar 2454166.035 3.26 1.52
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| − | 9-Mar 2454169.047 3.07 1.31
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| − | 11-Mar 2454171.074 3.07 1.33
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| − | 12-Mar 2454172.013 3.36 1.44
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| − | 16-Mar 2454176.01 3.2 1.38
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| − | [[Image:416.JPG]]
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| | + | <br> |
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| | + | Q - ''What is Julian Time?'' |
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| | + | A - '''Scientific conversion of time.''' |
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| | Go back to [[IC 2118 Current Research Activities]]. | | Go back to [[IC 2118 Current Research Activities]]. |
