Volume 404, Number 2, June III 2003
|Page(s)||611 - 620|
|Section||Stellar structure and evolution|
|Published online||02 June 2003|
Spectroscopic and photometric observations of the short-period RS CVn-type star ER Vulpeculae*
Department of Physics, Shoumen University, 9700 Shoumen, Bulgaria and Isaac Newton Institute of Chile, Bulgarian Branch e-mail: email@example.com; firstname.lastname@example.org
2 Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Cracow, Poland
3 Mt. Suhora Observatory of the Pedagogical University, ul. Podchorazych 2, 30-084 Cracow, Poland
Corresponding author: S. Zola, email@example.com
Accepted: 25 March 2003
Spectroscopic observations around the Hα line and BVR photometry of the eclipsing, short-period, RS CVn-type star ER Vul are presented. The solutions of new radial velocity and light curves yielded the following masses and radii of the components: , , , . The equatorial velocities corresponding to the measured rotational broadenings of the spectral lines are: km s-1 and km s-1. Their ratio is just equal to the ratio of the stellar radii. We detected excess emission in the Hα and CaI 6494 lines that changes during the orbital cycle. Our spectral data show the presence of absorbing matter around the mass center of the system.
Key words: stars: activity / binaries: eclipsing / binaries: spectroscopic / stars: chromospheres / stars: individual: ER Vul / stars: starspots
© ESO, 2003
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