Playing Around with Clusters - Revision history

Rebull at 02:07, 4 June 2024

2024-06-04T02:07:19Z

Rebull at 18:16, 30 June 2023

2023-06-30T18:16:59Z

Rebull at 18:16, 30 June 2023

2023-06-30T18:16:49Z

Rebull at 18:13, 30 June 2023

2023-06-30T18:13:14Z

Rebull at 18:41, 6 October 2022

2022-10-06T18:41:18Z

Rebull at 18:40, 6 October 2022

2022-10-06T18:40:57Z

Rebull at 17:35, 6 October 2022

2022-10-06T17:35:27Z

Rebull at 17:15, 6 October 2022

2022-10-06T17:15:54Z

Rebull at 18:30, 18 May 2022

2022-05-18T18:30:40Z

Rebull at 16:21, 17 May 2022

2022-05-17T16:21:30Z

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 =Finding the relative ages=
-[https://caltech.box.com/s/0n4d8l4rotxl77otkfeg01oe9rm70t43 This tarfile] has several files. It has pleiades.tbl, praesepe.tbl, and ngc6774.tbl. Load them into IRSA Viewer as catalogs. IRSA Viewer will recognize the positions and plot them on the sky on an image on the left, but also plot positions on the sky on the right. Change what is plotted to be an optical color-magnitude diagram, G vs. B-R, for each catalog (gmag vs. bpmag-rpmag). No need to compensate for distance if you don't want to. (Why do you think that is? What happens if you do compensate for distance?) Pin each CMD so that you can see all three CMDs at once. You may wish to make sure the titles are marked so that you know which diagram is which.
+[https://caltech.box.com/s/pkfawopfzinmmmjfpjc7msquhnvcvxfk This tarfile] has several files. It has pleiades.tbl, praesepe.tbl, and ngc6774.tbl. Load them into IRSA Viewer as catalogs. IRSA Viewer will recognize the positions and plot them on the sky on an image on the left, but also plot positions on the sky on the right. Change what is plotted to be an optical color-magnitude diagram, G vs. B-R, for each catalog (gmag vs. bpmag-rpmag). No need to compensate for distance if you don't want to. (Why do you think that is? What happens if you do compensate for distance?) Pin each CMD so that you can see all three CMDs at once. You may wish to make sure the titles are marked so that you know which diagram is which.
 Which cluster is the oldest? Which is the youngest? How do you know?

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 =Preamble=
-There are a lot of astronomy exercises that can be done once you have a list of cluster members. Now that there is plenty of Gaia data, there are lots of lists of stars that people think are members of various clusters. Some of the prep work that has to be done is extracting the data and converting it into a state that is straightforward for your students to use. Along with a framework of things to do with the clusters, I've done the prep work here for three clusters, along with an explanation of what I've done "behind the scenes" to get these data to this point. I've provided the data from the papers I've used, and then pointers to even more data that you could use to expand this project. Students, if you're reading this, this page could be the seeds for a really impressive science fair project.
+There are a lot of astronomy exercises that can be done once you have a list of cluster members. Now that there are plenty of Gaia data, there are lots of lists of stars that people think are members of various clusters. Some of the prep work that has to be done is extracting the data and converting it into a state that is straightforward for your students to use. Along with a framework of things to do with the clusters, I've done the prep work here for three clusters, along with an explanation of what I've done "behind the scenes" to get these data to this point. I've provided the data from the papers I've used, and then pointers to even more data that you could use to expand this project. Students, if you're reading this, this page could be the seeds for a really impressive science fair project.
 First, I just have the skeleton for the lab exercise, then I have more of the infrastructure stuff below that.

@@ Line 1: / Line 1: @@
 =Preamble=
-There is a lot of astronomy exercises that can be done once you have a list of cluster members. Now that there is plenty of Gaia data, there are lots of lists of stars that people think are members of various clusters. Some of the prep work that has to be done is extracting the data and converting it into a state that is straightforward for your students to use. Along with a framework of things to do with the clusters, I've done the prep work here for three clusters, along with an explanation of what I've done "behind the scenes" to get these data to this point. I've provided the data from the papers I've used, and then pointers to even more data that you could use to expand this project. Students, if you're reading this, this page could be the seeds for a really impressive science fair project.
+There are a lot of astronomy exercises that can be done once you have a list of cluster members. Now that there is plenty of Gaia data, there are lots of lists of stars that people think are members of various clusters. Some of the prep work that has to be done is extracting the data and converting it into a state that is straightforward for your students to use. Along with a framework of things to do with the clusters, I've done the prep work here for three clusters, along with an explanation of what I've done "behind the scenes" to get these data to this point. I've provided the data from the papers I've used, and then pointers to even more data that you could use to expand this project. Students, if you're reading this, this page could be the seeds for a really impressive science fair project.
 First, I just have the skeleton for the lab exercise, then I have more of the infrastructure stuff below that.

@@ Line 15: / Line 15: @@
 =Finding the relative ages=
-[https://caltech.box.com/s/p27611bs6et5uqglozcg6kykj216znzk This directory] has several files. Grab pleiades.tbl, praesepe.tbl, and ngc6774.tbl. Load them into IRSA Viewer as catalogs. IRSA Viewer will recognize the positions and plot them on the sky on an image on the left, but also plot positions on the sky on the right. Change what is plotted to be an optical color-magnitude diagram, G vs. B-R, for each catalog (gmag vs. bpmag-rpmag). No need to compensate for distance if you don't want to. (Why do you think that is? What happens if you do compensate for distance?) Pin each CMD so that you can see all three CMDs at once. You may wish to make sure the titles are marked so that you know which diagram is which.
+[https://caltech.box.com/s/0n4d8l4rotxl77otkfeg01oe9rm70t43 This tarfile] has several files. It has pleiades.tbl, praesepe.tbl, and ngc6774.tbl. Load them into IRSA Viewer as catalogs. IRSA Viewer will recognize the positions and plot them on the sky on an image on the left, but also plot positions on the sky on the right. Change what is plotted to be an optical color-magnitude diagram, G vs. B-R, for each catalog (gmag vs. bpmag-rpmag). No need to compensate for distance if you don't want to. (Why do you think that is? What happens if you do compensate for distance?) Pin each CMD so that you can see all three CMDs at once. You may wish to make sure the titles are marked so that you know which diagram is which.
 Which cluster is the oldest? Which is the youngest? How do you know?

@@ Line 56: / Line 56: @@
 Places with cluster membership (far from exhaustive list; get into ADS to find more [[Literature searching]])
-https://ui.adsabs.harvard.edu/abs/2018A%26A...616A..10G/abstract
+*https://ui.adsabs.harvard.edu/abs/2018A%26A...616A..10G/abstract
-And extract the source list (cluster, ra, dec) for each star from the relevant tables
+*And extract the source list (cluster, ra, dec) for each star from the relevant tables
-http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/616/A10#/browse
+*http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/616/A10#/browse
-Separating them out into one source list per cluster, in the right IPAC table format. Then bounce that ra, dec against IRSA’s copy of the Gaia catalogs to get G, B, and R, then use that to make the CMDs.
+*Separating them out into one source list per cluster, in the right IPAC table format. Then bounce that ra, dec against IRSA’s copy of the Gaia catalogs to get G, B, and R, then use that to make the CMDs.
-http://cdsarc.u-strasbg.fr/ftp/J/A+A/616/A10/ReadMe
+*http://cdsarc.u-strasbg.fr/ftp/J/A+A/616/A10/ReadMe
-https://academic.oup.com/mnras/article/512/3/4464/6563713
+*https://academic.oup.com/mnras/article/512/3/4464/6563713
-https://www.aanda.org/articles/aa/full_html/2018/08/aa32843-18/aa32843-18.html#T3
+*https://www.aanda.org/articles/aa/full_html/2018/08/aa32843-18/aa32843-18.html#T3
-https://www.aanda.org/articles/aa/full_html/2018/08/aa32843-18/F16.html
+*https://www.aanda.org/articles/aa/full_html/2018/08/aa32843-18/F16.html
-pc gaia catalog https://ui.adsabs.harvard.edu/abs/2021A%26A...649A...6G/abstract
+*100 pc gaia catalog https://ui.adsabs.harvard.edu/abs/2021A%26A...649A...6G/abstract
-https://academic.oup.com/mnras/article/478/4/5184/5033414 and https://cdsarc.cds.unistra.fr/ftp/J/MNRAS/478/5184/ReadMe
+*https://academic.oup.com/mnras/article/478/4/5184/5033414 and https://cdsarc.cds.unistra.fr/ftp/J/MNRAS/478/5184/ReadMe

@@ Line 29: / Line 29: @@
 Are these plots different? How? (hint: Look at the range of the x axis.) Why are they so different?
-'''Challenge''': Make optical and NIR CMDs from the same catalog. Find the giants and WDs in both plots by using IRSA Viewer's capabilities. Where are they in both plots?
+'''Challenge''': Make optical and NIR CMDs from the same catalog such that once you click on a giant or a white dwarf in a cluster in an optical CMD then it is also highlighted in the corresponding NIR CMD. Where are they in both plots -- are they where you expect?
-If you want to read more about what these authors did to get these members, the papers are these:
+If you want to read more about what these particular authors did to get these members, the papers are these:
 *https://ui.adsabs.harvard.edu/abs/2021ApJ...912..162P/abstract
 *https://ui.adsabs.harvard.edu/abs/2022ApJ...931..156P/abstract

← Older revision		Revision as of 18:30, 18 May 2022
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	do the same thing against 2mass and explore why the NIR CMDs look so different than the optical ones.		do the same thing against 2mass and explore why the NIR CMDs look so different than the optical ones.
		+
		+	100 pc gaia catalog https://ui.adsabs.harvard.edu/abs/2021A%26A...649A...6G/abstract