| Issue |
A&A
Volume 429, Number 2, January II 2005
|
|
|---|---|---|
| Page(s) | 625 - 629 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20041300 | |
| Published online | 17 December 2004 | |
First spectra of the W UMa system V524 Monocerotis*
European Southern Observatory, Casilla 19001, Santiago 19, Chile e-mail: tdall@eso.org
Received:
16
May
2004
Accepted:
27
August
2004
We present the first high-resolution spectra of the W UMa contact binary
V524 Mon. The spectra of the two components are very similar, resembling
a G5 and a K0. We find the radial velocities and rotational velocities consistent with corotation. We estimate the radii and the masses
and derive a mass ratio 
. We confirm that V524 Mon is a W-type contact system,
likely enclosed in a common convective envelope, as found
by [CITE]. We do not find evidence for the expected level of emission in
the chromospheric 
H and K lines, neither Hα, indicating
that the magnetic activity is much weaker than expected or that other processes are hampering chromospheric emission.
Key words: stars: binaries: symbiotic / stars: binaries: spectroscopic / stars: chromospheres / stars: activity
© ESO, 2005
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