Classsification of Pre main sequence(PMS) stars

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In summary, there is a classification of PMS based on color-color diagram as class 0, class I and class II. This classification is applicable to PMS and can be found in the appendix portion of the paper by Koenig et.al(2012). The paper also discusses the evolution of massive star-forming regions and includes references to other studies on pre-main-sequence populations in different regions. Additional resources on young stellar objects and progressive star formation in the Magellanic Clouds are also provided.
  • #1
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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  • #2
That applies to main sequence stars, not protostars.
 
  • #3
no, its applicable to PMS. see the appendix portion of the paper by Koenig et.al(2012).
 
  • #4
@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?
 
  • #5
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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1. What is the definition of a pre-main sequence star?

A pre-main sequence (PMS) star is a young star that is still in the process of forming and has not yet reached the main sequence stage of its evolution. These stars are typically less than 10 million years old and are still contracting and heating up as they fuse hydrogen in their cores.

2. How are pre-main sequence stars classified?

PMS stars are classified based on their spectral type, which is determined by the star's surface temperature and luminosity. This information is obtained through spectroscopy, which analyzes the star's electromagnetic radiation.

3. What are the different types of pre-main sequence stars?

There are two main types of PMS stars: T Tauri stars and Herbig Ae/Be stars. T Tauri stars are low-mass stars that are still contracting and have not yet begun fusion in their cores. Herbig Ae/Be stars are more massive and have already begun fusion, but are still surrounded by a disk of gas and dust.

4. What factors determine the evolution of a pre-main sequence star?

The evolution of a PMS star is primarily determined by its initial mass and the amount of gas and dust in its surrounding disk. Higher mass stars evolve faster and are more likely to become main sequence stars, while lower mass stars may take longer to reach the main sequence or may never become main sequence stars at all.

5. How do pre-main sequence stars affect their surrounding environment?

PMS stars play a crucial role in the formation of planetary systems. As they contract and heat up, they emit strong winds and radiation that can shape and disperse the gas and dust in their surrounding disks. This process can lead to the formation of planets and other objects in the disk.

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