Talk:CG4 Spring work

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

   Looked for and found YSOs in Gum Nebula (near CG4 and Sa101 and CG13)
   Used
       JHK IR photometry (sort of like us)  ESO 1m        J-H and H-K
       UBV photometry (like us)             ESO 1m
       Ha spectroscopy                      CTIO 60/90cm Curtis Schmidt telescope with 6deg prism    1-2hrs
       Point source spectroscopy            ESO 1.52m and 3.6m        3700A to 7000A                    10-40 min

• High Level Summary

• Most Interesting

Introduction:

   Good description of cometary nebulae
   Good rundown of CG formation theory
       OB starformed nearby and the UV radiation scrunched and eroded nearby nebula (some evidence in this paper for this method)
       or SN went off nearby and shockwave scrunched and eroded nearby nebula

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 seven 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 did have it

For Apr 21:

   *VIVIAN -- Kim et al 2003 http://adsabs.harvard.edu/abs/2003csss...12..799K 
    Full Paper link click here. [1]

• Main Point

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• 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

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• I agree with this

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• 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

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• I agree with this

• I disagree with this

• Why we should care