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
Corresponding author: L. Iliev, firstname.lastname@example.org
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
© ESO, 2002