Difference between revisions of "Talk:CG4 Spring work"

From CoolWiki
Jump to navigationJump to search
Line 5: Line 5:
  
 
*''Main Point''
 
*''Main Point''
 +
    Looked for 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
 +
 +
 +
Findings:
 +
   
 +
       
 +
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
 +
 +
   
 +
 +
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
 +
       
  
 
*''High Level Summary''
 
*''High Level Summary''
Line 13: Line 55:
  
 
*''I disagree with this''
 
*''I disagree with this''
 +
    found there are different ages (spectra and movement away from globule)
 +
        probably continuous (from 8 stars?)
 +
       
 +
    Found late-type premain sequence stars
  
 
*''Why we should care''
 
*''Why we should care''
 +
 +
    found seven new YSOs in the area
 +
    confirmed one previous YSO
  
  

Revision as of 21:53, 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
   Looked for 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

Findings:


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

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
  • High Level Summary
  • Most Interesting
  • I agree with this
  • I disagree with this
   found there are different ages (spectra and movement away from globule) 
       probably continuous (from 8 stars?)
       
   Found late-type premain sequence stars
  • Why we should care
   found seven new YSOs in the area
   confirmed one previous YSO


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
Retrieved from "https://vmcoolwiki.ipac.caltech.edu/index.php?title=Talk:CG4_Spring_work&oldid=4118"