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Discovery of Par 1802 as a Low‐Mass, Pre‐Main‐Sequence Eclipsing Binary in the Orion Star‐Forming Region
- Source :
- The Astrophysical Journal. 674:329-335
- Publication Year :
- 2008
- Publisher :
- American Astronomical Society, 2008.
-
Abstract
- We report the discovery of a pre-main-sequence, low-mass, double-lined, spectroscopic, eclipsing binary in the Orion star-forming region. We present our observations including radial velocities derived from optical high-resolution spectroscopy, and present an orbit solution that permits the determination of precise empirical masses for both components of the system. We measure that Par 1802 is composed of two equal mass (0.39+-0.03, 0.40+-0.03 Msun) stars in a circular, 4.7 day orbit. There is strong evidence, such as the system exhibiting strong Li lines and a center-of-mass velocity consistent with cluster membership, that this system is a member of the Orion star-forming region and quite possibly the Orion Nebula Cluster, and therefore has an age of only a few million years. As there are currently only a few empirical mass and radius measurements for low-mass, PMS stars, this system presents an interesting test for the predictions of current theoretical models of pre-main sequence stellar evolution.<br />21 pages, 6 figures, 2 tables; Fig 2 caption edited
- Subjects :
- Physics
010504 meteorology & atmospheric sciences
Astrophysics (astro-ph)
FOS: Physical sciences
Binary number
Astronomy and Astrophysics
Radius
Astrophysics
01 natural sciences
Stars
Orbit
Space and Planetary Science
0103 physical sciences
Orion Nebula
Cluster (physics)
Astrophysics::Solar and Stellar Astrophysics
Astrophysics::Earth and Planetary Astrophysics
10. No inequality
Low Mass
010303 astronomy & astrophysics
Stellar evolution
Astrophysics::Galaxy Astrophysics
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 15384357 and 0004637X
- Volume :
- 674
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal
- Accession number :
- edsair.doi.dedup.....5ef13fe8961f0955c86a6715d29354e6