Difference between revisions of "Talk:CG4 Spring work"
| Line 5: | Line 5: | ||
*''Main Point'' | *''Main Point'' | ||
| − | + | Found 8 new YSOs in Gum Nebula (near CG4 and Sa101 and CG13) using IR photometry, UBV photometry and spectroscopy. | |
*''High Level Summary'' | *''High Level Summary'' | ||
| Line 18: | Line 18: | ||
Point source spectroscopy ESO 1.52m and 3.6m 3700A to 7000A 10-40 min | Point source spectroscopy ESO 1.52m and 3.6m 3700A to 7000A 10-40 min | ||
| − | + | found there are different ages (spectra and movement away from globule) | |
| − | + | Found late-type premain sequence stars | |
Identified spectral type using spectra | Identified spectral type using spectra | ||
| Line 26: | Line 26: | ||
*''Most Interesting'' | *''Most Interesting'' | ||
Introduction: | Introduction: | ||
| − | + | Good description of cometary nebulae | |
| − | + | Good rundown of CG formation theory | |
| − | + | 1. OB starformed nearby and the UV radiation scrunched and eroded nearby nebula (some evidence in this paper for this method) | |
| − | + | 2. or SN went off nearby and shockwave scrunched and eroded nearby nebula | |
CG4 might have been evaporating for 1,000,000years | CG4 might have been evaporating for 1,000,000years | ||
Revision as of 22:15, 14 April 2010
For Apr 14:
* KEVIN -- Reipurth and Pettersson 1993
http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1993A%26A...267..439R&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf
- Main Point
Found 8 new YSOs in Gum Nebula (near CG4 and Sa101 and CG13) using IR photometry, UBV photometry and spectroscopy.
*High Level Summary
Surveyed 5 fields with 15 cometary globules Found 8 new YSOs Confirmed one previous YSO
Equipment Used
Ha spectroscopy CTIO 60/90cm Curtis Schmidt telescope with 6deg prism 1-2hrs
JHK IR photometry (sort of like us) ESO 1m J-H and H-K
UBV photometry (like us) ESO 1m
Point source spectroscopy ESO 1.52m and 3.6m 3700A to 7000A 10-40 min
found there are different ages (spectra and movement away from globule) Found late-type premain sequence stars
Identified spectral type using spectra ruled out forground/background with spectra and
- Most Interesting
Introduction: Good description of cometary nebulae Good rundown of CG formation theory 1. OB starformed nearby and the UV radiation scrunched and eroded nearby nebula (some evidence in this paper for this method) 2. or SN went off nearby and shockwave scrunched and eroded nearby nebula CG4 might have been evaporating for 1,000,000years
CG4 might have been a shade for Sa101 to hide behind. Until the
CG4 evaporation may have started >1,000,000 years ago.
In faint background stars they found stars becoming more prominent as they used longer wavelength filters (good for us)
Spectral class
M3 to K7
M2, M3-4, K7-M0, K7, K2-5, K5, M1-2, K2
- Not sure about this
Quesitons and Kevin trying to dodge the questions
TiO and MgH
using the width and
Ha
width of line (spinning?)
Balmer series
forbidden [OI] linesat 6300 and 6363A
prominent absorption at 5577A
absorbtion trough at 6200A deeper
- I agree with this
found eight new YSOs in the area confirmed one previous YSO found there are different ages (spectra and movement away from globule) Found late-type premain sequence stars
- I disagree with this
found there are different ages (spectra and movement away from globule)
probably continuous (from 8 stars?)
- Why we should care
found seven new YSOs in the area confirmed one previous YSO Used some of the same techniques we will Found YSOs and confirmed previous ones Found faint background stars getting more prominent in longer wavelength filters Not all CG had star formation but CG4 was one that had some nearby
For Apr 21:
*VIVIAN -- Kim et al 2003 http://adsabs.harvard.edu/abs/2003csss...12..799K Full Paper link click here. [1]
- Main Point
- High Level Summary
- Most Interesting
- I agree with this
- I disagree with this
- Why we should care
For Apr 28:
*CHELEN -- Kim 2005 http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?2003ASPC..287..275K&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf
- Main Point
- High Level Summary
- Most Interesting
- I agree with this
- I disagree with this
- Why we should care
For May 5:
*CAROLYN -- Choudhury and Bhatt 2008 http://arxiv.org/PS_cache/arxiv/pdf/0811/0811.4389v1.pdf the ADS entry is http://adsabs.harvard.edu/abs/2009MNRAS.393..959C and I downloaded the real journal article for you (easier to read!) here: media:choud.pdf
- Main Point
- High Level Summary
- Most Interesting
- I agree with this
- I disagree with this
- Why we should care
