Classsification of Pre main sequence(PMS) stars

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The classification of pre-main sequence (PMS) stars is based on color-color diagrams, categorized into class 0, class I, and class II. Participants discuss the applicability of this classification to PMS stars, emphasizing its relevance and referencing the appendix of Koenig et al. (2012) for further details. There is a request for better references to support the discussion, as some participants are unfamiliar with the cited papers. Additional resources, including various research papers and notes on young stellar objects, are shared to aid understanding. The conversation highlights the importance of accurate references in astrophysical research.
vrinda mukund
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Hello everyone,
there is a classification of PMS based on color-color diagram as class 0, class I and class II. can some one please explain more about this classification or provide me with some useful link. I am trying to plot color-color diagram of an Open cluster using Wise Band data.
 
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That applies to main sequence stars, not protostars.
 
no, its applicable to PMS. see the appendix portion of the paper by Koenig et.al(2012).
 
@vrinda - please post a better reference - meaning we did not happen to read the paper you have in mind, so how can we read it, too?
 
vrinda mukund said:
no, its applicable to PMS. see the appendix portion of the paper by Koenig et.al(2012).
This paper?

Koenig, X. P. and Leisawitz, D. T. and Benford, D. J. and Rebull, L. M. and Padgett, D. L. and Assef, R. J. (2012) Wide-field Infrared Survey Explorer Observations of the Evolution of Massive Star-forming Regions. Astrophysical Journal, 744 (2). p. 130. ISSN 0004-637X
http://resolver.caltech.edu/CaltechAUTHORS:20120130-115037613

There is a paper by Koenig (2008) http://arxiv.org/abs/0808.3284 that is referenced by:

Wide-Field Survey of Emission-line Stars in IC 1396
http://arxiv.org/pdf/1201.2761.pdf

Pre-main-sequence population in NGC 1893 region
http://arxiv.org/pdf/1207.5632.pdf


Perhaps this is of interest: Introduction to Young Stellar Objects
http://astro.berkeley.edu/~ay216/08/NOTES/Lecture24-08.pdf

http://hubblesite.org/hubble_discoveries/science_year_in_review/pdf/2007/progressive_star_formation_in_the_magellanic_clouds.pdf
 
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