EDP Sciences
Free access
Volume 395, Number 3, December I 2002
Page(s) 885 - 890
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20021316

A&A 395, 885-890 (2002)
DOI: 10.1051/0004-6361:20021316

The radial velocities and physical parameters of HD 553

R. Duemmler1, I. Kh. Iliev2 and L. Iliev3

1  Astronomy Division, PO Box 3000, 90014 University of Oulu, Finland
2  National Astronomical Observatory (NAO) Rozhen, and Isaac Newton Institute of Chile, Bulgarian Branch, PO Box 136, 4700 Smolyan, Bulgaria
3  Institute of Astronomy, Bulgarian Academy of Sciences, and Isaac Newton Institute of Chile, Bulgarian Branch, Tsarigradsko Shosse Blvd. 72, 1184 Sofia, Bulgaria

(Received 3 June 2002 / Accepted 5 September 2002 )

HD 553 was discovered as an eclipsing binary by Hipparcos. Here, we present the first radial velocity curve for this system. It is found, that HD 553 is a double-lined spectroscopic binary. Despite the large luminosity difference, the two components of this system are of very similar mass. The primary, a K0-giant, fills a large fraction of its Roche-lobe. The secondary is, despite its very similar mass, still a late-type dwarf. The radial velocity curve allows to constrain several stellar and system parameters.

Key words: stars: individual: HD 553 -- binaries: spectroscopic -- binaries: eclipsing -- stars: late-type -- stars: starspots -- techniques: radial velocities

Offprint request: L. Iliev, liliev@libra.astro.bas.bg

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