Difference between revisions of "Talk:CG4 Spring work"

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For Apr 14:
+
=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
  
    * KEVIN -- Reipurth and Pettersson 1993 
+
==''Main Point''==
    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
+
Found 8 new YSOs in Gum Nebula (near CG4 and Sa101 and CG13) using IR photometry, UBV photometry and spectroscopy.
  
*''Main Point''
+
==''High Level Summary''==
    Looked for and found YSOs in Gum Nebula (near CG4 and Sa101 and CG13)
+
Surveyed 5 fields with 15 cometary globules
    Used
+
Found 8 new YSOs
        JHK IR photometry (sort of like us)  ESO 1m        J-H and H-K
+
Confirmed one previous YSO
        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''
+
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:
 
Introduction:
    Good description of cometary nebulae
+
Good description of cometary nebulae
    Good rundown of CG formation theory
+
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)
+
1.  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
+
2.  or SN went off nearby and shockwave scrunched and eroded nearby nebula
+
CG4 might have been evaporating for 1,000,000years
  
  
Line 27: Line 37:
 
   
 
   
 
   
 
   
Spectral class
+
Spectral classes
    M3 to K7
+
M3 to K7
        M2, M3-4, K7-M0, K7, K2-5, K5, M1-2, K2
+
M2, M3-4, K7-M0, K7, K2-5, K5, M1-2, K2
 
    
 
    
*''Not sure about this''
+
==''Not sure about this''==
Quesitons and Kevin trying to dodge the questions
+
Questions and Kevin trying to dodge the answers
    TiO and MgH
+
 
        using the width and  
+
TiO and MgH
    Ha  
+
using the width and  
        width of line (spinning?)
+
 
 +
Ha  
 +
 
 +
width of line (spinning?)
 
   
 
   
    Balmer series
+
Balmer series
    forbidden [OI] linesat 6300 and 6363A
+
forbidden [OI] linesat 6300 and 6363A
    prominent absorption at 5577A
+
prominent absorption at 5577A
    absorbtion trough at 6200A deeper
+
absorbtion trough at 6200A deeper
 
          
 
          
  
+
==''I agree with this''==
   
 
 
 
 
*''I agree with this''
 
  
    found seven new YSOs in the area
+
found eight new YSOs in the area
    confirmed one previous YSO
+
confirmed one previous YSO
    found there are different ages (spectra and movement away from globule)  
+
found there are different ages (spectra and movement away from globule)  
    Found late-type premain sequence stars
+
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?)
  
*''I disagree with this''
+
==''Why we should care''==
    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
  
    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. [http://origins.colorado.edu/cs12/proceedings/poster/kimxx.pdf]
  
For Apr 21:
+
==''Main Point''==
    *VIVIAN -- Kim et al 2003 http://adsabs.harvard.edu/abs/2003csss...12..799K
+
High mass stars can terminate low mass star formation (LMSF) or they can trigger it.
    Full Paper link click here. [http://origins.colorado.edu/cs12/proceedings/poster/kimxx.pdf]
 
  
*''Main Point''
+
==''High Level Summary''==
 +
Pressure induced by winds and radiation from high mass stars and by radiation can sweep away low density clouds surrounding low mass stars, but can also collapse the surrounding clouds and start low mass star formation (LMSF) in the cores of these remnant clouds. Cometary globules in places like the Gum Nebula are perfect places to study this triggered LMSF. CGs are evaporating molecular cloud cores with head-tail geometry.  The head points towards the HMS source of the winds and radiation causing the evaporation.
  
*''High Level Summary''
+
==''What they did''==
 +
They analyzed X-Ray ROSAT/HRI data, Optical Data for photometry from CTIO/0.9m, and Near-IR using JHK images from the CIRIM detector on the CTIO/1.5m telescope.
  
*''Most Interesting''
+
==''Most Interesting''==
 +
Section 3.2 addresses our CG4.  They did optical photometry.
  
*''I agree with this''
+
==''I agree with this''==
  
*''I disagree with this''
+
==''I disagree with this''==
 +
Did they get different object data on different telescopes of the same or different regions.  I'll explain better on the phone.
  
*''Why we should care''
+
==''Why we should care''==
 +
Summary states that "There are indeed candidate PMS stars in .... CG4 .....  They think there are a few PMS stars in CG4; that there are none around the eroded head of CG4 and suggest that there is an age gradient from the head to the tail. The suggested explanation is that the LMSF in the region may have been gradual and under the influence of the high mass stars in Vela OB2.
  
  
For Apr 28:  
+
=For Apr 28: CHELEN -- Kim 2005 =
    *CHELEN -- Kim 2005  
+
http://adsabs.harvard.edu/abs/2005AJ....129.1564K
    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''
+
==''Main Point''==
  
*''High Level Summary''
+
==''High Level Summary''==
  
*''Most Interesting''
+
==''Most Interesting''==
  
*''I agree with this''
+
==''I agree with this''==
  
*''I disagree with this''
+
==''I disagree with this''==
  
*''Why we should care''
+
==''Why we should care''==
  
  
For May 5:
+
=For May 5: CAROLYN -- Choudhury and Bhatt 2008  =
    *CAROLYN -- Choudhury and Bhatt 2008   
+
http://arxiv.org/PS_cache/arxiv/pdf/0811/0811.4389v1.pdf   
    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]]
    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''
+
==''Main Point''==
  
*''High Level Summary''
+
==''High Level Summary''==
  
*''Most Interesting''
+
==''Most Interesting''==
  
*''I agree with this''
+
==''I agree with this''==
  
*''I disagree with this''
+
==''I disagree with this''==
  
*''Why we should care''
+
==''Why we should care''==

Latest revision as of 22:57, 21 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 classes M3 to K7 M2, M3-4, K7-M0, K7, K2-5, K5, M1-2, K2

Not sure about this

Questions and Kevin trying to dodge the answers

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 mass stars can terminate low mass star formation (LMSF) or they can trigger it.

High Level Summary

Pressure induced by winds and radiation from high mass stars and by radiation can sweep away low density clouds surrounding low mass stars, but can also collapse the surrounding clouds and start low mass star formation (LMSF) in the cores of these remnant clouds. Cometary globules in places like the Gum Nebula are perfect places to study this triggered LMSF. CGs are evaporating molecular cloud cores with head-tail geometry. The head points towards the HMS source of the winds and radiation causing the evaporation.

What they did

They analyzed X-Ray ROSAT/HRI data, Optical Data for photometry from CTIO/0.9m, and Near-IR using JHK images from the CIRIM detector on the CTIO/1.5m telescope.

Most Interesting

Section 3.2 addresses our CG4. They did optical photometry.

I agree with this

I disagree with this

Did they get different object data on different telescopes of the same or different regions. I'll explain better on the phone.

Why we should care

Summary states that "There are indeed candidate PMS stars in .... CG4 ..... They think there are a few PMS stars in CG4; that there are none around the eroded head of CG4 and suggest that there is an age gradient from the head to the tail. The suggested explanation is that the LMSF in the region may have been gradual and under the influence of the high mass stars in Vela OB2.


For Apr 28: CHELEN -- Kim 2005

http://adsabs.harvard.edu/abs/2005AJ....129.1564K

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