Difference between revisions of "Talk:Main Page"
(T-Tauri/IC2118 Presentation for Astroblast 2007)
|Line 105:||Line 105:|
0.7 cm 0.05 0.15 0.47 1
0.7 cm 0.05 0.15 0.47 1
Revision as of 18:53, 30 June 2007
Planning for work session June 29 and/or June 30th for Oil City Students
Matt, Matt, Nick, Greg, Danni, Alexis, and Sandy,
We had tentatively planned to meet to work on Spitzer stuff and get ready for California on Friday June 29 and/or Saturday June 30. We could meet at the high school something that might be a bit more relaxed is to meet here at my house near Pine City. Please make comments here at the Wiki site as to what your schedule is like and whether or not you can make a work session. Please do this ASAP so we can decide what will work.
Thanks, Mr. Spuck
Anytime on Saturday the 30th is good for me. I can not make it on the 29th because my brother is arriving from New Jersey that day. Where exactly in Pine City do you live? Could you send directions to my email? Matt H.
FROM SPUCK - - Turn LEFT onto E 1ST ST / US-62 N. Continue to follow US-62 N. Go 2.9 miles Map
- US-62 N becomes PA-157. Go 13.5 miles Map
- Turn SLIGHT RIGHT onto PA-208. Go 3.7 miles Map
- Turn RIGHT onto MILLERSTOWN RD. Go 1.4 miles
- Gravel lane is on right hand side. Come up lane about 1000 feet.
How late into saturday are you planning to work saturday b/c i can't be there until like 1 o'clock earliest!! MATT W.
FROM SPUCK - Is there another day that works better for everyone ... for example Monday morning July 2 into MOnday afternoon??? Please let me know what your schedule is. Also, keep in mind when you make comments that this discussion page is something that can be viewed by the entire world. This is ok, because we want other teacher/student research teams to see first hand the both the good and bad of trying to conduct student teacher research. We are kind of like the "reality TV show" only on the web. :) Thanks, please respond ASAP. Mr. Spuck
I am gonna be gone from the July 1st to the 6th in Virginia. I was talking to Nick Kelley and he was saying that he can make it on the 30th anytime like me. Whatever time Matt W. can make the meeting is fine with me and Nick!! Also Greg is currently in Washington DC with a biology seminar and will not be back till July 3rd. He wanted me to fill him in with all the info he is gonna miss when he gets back. Matt H.
FROM SPUCK - Ok ... it looks like we will meet on Saturday (June 30th). Has anyone spoken to Danni or Alexis?? So where do we want to meet and what time? I'm not sure what condition my room is at the high school because of summer cleaning. I will know more tomorrow when I go up to the school. If we meet at my place, I think we should start BY 10:00 AM and plan on going till about 5:00 PM. If your parents could bring you out, then I could get you back to the Oil City area by 6:00 PM on Saturday, or they can pick you up. Let me know what you think. Matt H. ... have you been in recent contact with Nick? Why has he not posted on the Wiki? Thanks.
I have been talking to Nick about our upcoming meeting this weekend. However right now Nick is grounded and I believe he can not use the internet.(not sure totally) Also that time at your house is fine with me. Though I might have to be leaving an hour early but right now I'm not certain, I will find out tomorrow and post it up here. Also I will try to get a hold of Nick to tell him about the meeting. Matt H.
SaturdaY IS THE BEST DAy for me i work 11pm to 7am sundaye night and i work 11pm 7am monday night so that wont work
FROM SPUCK - I'll assume the comments above are from Nick Kelley. I'f wrong please let me know. I checked my room out yesterday at the high school and everything has been removed for cleaning. So I guess it is my house (see directions above). Plan on arriving between 9:30 and 10:00 AM and we will plan on stopping right around 5:00 PM. Either your parents could pick you up at 5:00 PM or I'll be going to Oil City around 6:00 PM on Saturday and I could give you a ride. If I have this correct it will be Nick at Matt H, with Matt W coming by in the afternoon. Anyone else?
Sounds right to me... Matt W.
DANI- account up and running. w00o
Proposal for Radio Observations of T-Tauri Candidates in IC2118
SUPPORT INFORMATION - T-Tauri Candidates Emit Radio
FROM MATT WALENTOSKY 6/30/2007 @ 2:30 PM - Two Abstracts Below
Title: Radio emission from pre-main-sequence stars Authors: Skinner, Stephen Lee
Affiliation: AA(Colorado Univ., Boulder.) Publication: Ph.D. Thesis Colorado Univ., Boulder. Publication Date: 01/1992 Category: Space Radiation Origin: STI
Abstract This study focuses on the properties and physical origin of radio continuum emission from pre-main-sequence (PMS) stars. These are young stars, typically less than a few million years old, and are still in a phase of gravitational contraction that will ultimately be halted by the onset of hydrogen burning in their cores. First, I address the question of the origin of centimeter continuum emission in intermediate mass (approx. equal to 3-20 solar mass) PMS stars, the so-called 'Herbig Ae/Be stars'. A high-sensitivity radio survey of 57 such stars was undertaken using the Very Large Array and Australia Telescope, resulting in the detection of twelve stars. These observations provide a homogenous data base consisting of information on source sizes, radio luminosities, variability timescales, circular polarization, and spectral energy distributions in the wavelength range 2-20 cm. Using these data along with previously published spectroscopy, I conclude that centimeter radio emission from Herbig Ae/Be stars is predominantly thermal and in many cases wind-related. An unexpected result of the above program was the serendipitous detection of circularly polarized radio emission in the low mass (approx. equal to 1 solar mass) PMS star Hubble 4, a member of the class of 'weak-lined T Tauri stars' (WTTS). This provides some of the most convincing evidence to date for the existence of ordered magnetic fields in WTTS. In a second observing program, I have searched for evidence of cold (less than or equal to 50 K) circumstellar dust around WTTS, which might exist in the form of remnant disks. Of the sixteen WTTS that were observed in the wavelength range 450-1100 microns using the James Clerk Maxwell Telescope, only V836 Tau was detected. Its spectral energy distribution longward of 10 microns is consistent with that expected for a flat, axisymmetric circumstellar disk of mass approx. equal to 0.04 solar mass (= 42 Jupiter masses). This star may be a rare example of an object in which disk dispersal is underway, but not yet complete.
Title: Centimeter Radio Emission from Low-Mass Weak T Tauri Stars in Taurus-Auriga Authors: Chiang, Eugene; Phillips, R. B.
Affiliation: AA(MIT), AB(MIT Haystack Observatory) Publication: American Astronomical Society, 185th AAS Meeting, #48.08; Bulletin of the American Astronomical Society, Vol. 26, p.1388 Publication Date: 12/1994 Origin: AAS Abstract Copyright:(c) 1994: American Astronomical Society
Abstract We report on the results of a sensitive survey for lambda 3.6 cm radio emission from low-mass, weak T Tauri (WTT) stars in the Taurus-Auriga cloud complex. The target population consists of stars in the Herbig and Bell Catalog of spectral type K7 or later, and W(Hα ) <= 10 Angstroms. Of the 28 such stars surveyed using the Very Large Array down to detection thresholds of ~ 0.1 mJy, 7 (possibly 8) are observed to emit at strengths ranging from 0.1 to 2 mJy. Five of these young radio stars are newly discovered in our survey: V827 Tau and V710 Tau B are discovered to be relatively strong sources of mJy emission, while IW Tau, UX Tau B, and the possible detection LkHa 332-G1 form a new population of relatively weak emitters. Our radio survey and complementary surveys are pooled, and of 43 WTT stars K7 or later in Tau-Aur, 14 are now known to be radio emitters at lambda 6 and lambda 3.6 cm. Correlations between radio luminosity and other stellar parameters have been attempted but generally yield null results. Wide binarity (component separations in excess of 0.13, 20 AU) appears unrelated to radio emission, as does spectral type. Furthermore, we find no convincing evidence for the extreme youth of radio stars, contrary to claims in the literature over the past decade. While we do find that radio-loud stars in our sample are formally younger than the radio-quiet stars by about 0.5 Myr, the reality of this relatively small age difference is highly suspect given uncertainties in the placement of these stars on the HR diagram. Moreover, Monte Carlo-type calculations involving distributing the stars on both the HR diagram and local CO gas density cast doubts on any differences between the radio stars and the general WTT population. We conclude that the age effect for low-mass radio WTT stars in Tau-Aur, if real, is much smaller than previous estimations by factors of 4-10. It is also possible centimeter wavelength surveys to date have still not properly described the radio luminosity function of low-mass WTT stars in Tau-Aur, and we urge future observations of these young stars with denser temporal coverage.
FROM SPUCK 6/30/2007 @ 2:35pm
I'm not sure that we will be able to use the GBT telescope in Green Bank for observations. The beamwidth at 10-15 GHz is probably too big.
Here are the specs for the GBT Beamwidth (Table 3) Diffraction beamwidth (FWHM) 8 GHz it is 90", 20 GHz it is 36", 50 GHz it is 14"
Here are some questions from Sue Ann Heatherly at NRAO-Green Bank - One question I have is: is the resolving power of the GBT sufficient to distinguish spatially between individual stars? Does large scale emission exist within the nebula that will confuse your results?
The VLA is probably the only instrument that can be used. nick kelley
Synthesized Beamwidth (arcsec)depending on configuration
400 cm 24.0" 80.0" 260.0" 850.0"
90 cm 6.0" 17.0" 56.0" 200.0"
20 cm 1.4 " 3.9" 12.5" 44.0"
6 cm 0.4 " 1.2""" 3.9 " 14.0 "
3.6 cm 0.24 " 0.7" 2.3 " 8.4 "
2 cm 0.14 " 0.4 " 1.2" 3.9"
1.3 cm 0.08 " 0.3" 0.9 "2.8"
0.7 cm 0.05 0.15 0.47 1
T-Tauri/IC2118 Presentation for Astroblast 2007
Oil City High School students will be presenting August 11 at the Oil Region Astronomical Observatory