Issue |
A&A
Volume 481, Number 3, April III 2008
|
|
---|---|---|
Page(s) | 747 - 755 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20078585 | |
Published online | 05 February 2008 |
The pre-main-sequence eclipsing binary ASAS J052821+0338.5*
1
School of Physics & Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, Scotland e-mail: Eric.Stempels@st-andrews.ac.uk
2
Physics and Astronomy Department, Vanderbilt University, Nashville, TN 37235, USA
3
Astronomy Department, New Mexico State University, Las Cruces, NM 88003, USA
4
Nordic Optical Telescope, Apartado 474, 38700 Santa Cruz de La Palma, Spain
5
Department of Physics and Astronomy, Århus University, Denmark
Received:
31
August
2007
Accepted:
30
January
2008
Aims. In this paper we present the first results of a detailed spectroscopic and
photometric analysis of the eclipsing binary
ASAS J052821+0338.5.
Methods. With the FIES spectrograph at the Nordic Optical Telescope, we obtained
a series of high-resolution spectra () covering the
entire orbit of the system. In addition we obtained simultaneous broadband
photometry from three small aperture telescopes. From these spectroscopic and
photometric data we have derived the system's orbital parameters and
determined the fundamental stellar parameters of the two components.
Results. Our results indicate that ASAS J052821+0338.5 is a K1/K3 pre-main-sequence
eclipsing binary, with component masses of and
and a period of 3.87 days, located at a distance of
pc. The kinematics, physical location, and the evolutionary
status of the two stars suggest that ASAS J052821+0338.5 is a member of the ~11 Myr old Orion OB1a subassociation. The systems also exhibits smooth
~
out-of-eclipse variations that are similar to those found
in RS CVn binaries. Furthermore, the parameters we derived are consistent with
the
Myr isochrones of the popular Baraffe stellar evolutionary
models.
Key words: stars: pre-main sequence / stars: binaries: eclipsing / stars: binaries: spectroscopic / stars: fundamental parameters / stars: individual: ASAS J052821+0338.5
© ESO, 2008
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