Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...404..611k&link_type=abstract
Astronomy and Astrophysics, v.404, p.611-620 (2003)
Astronomy and Astrophysics
Astrophysics
8
Stars: Activity, Binaries: Eclipsing, Binaries: Spectroscopic, Stars: Chromospheres, Stars: Individual: Er Vul, Stars: Starspots
Scientific paper
Spectroscopic observations around the Halpha 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: M1=1.16 Msun, M2=1.05 Msun, R1=1.25 Rsun, R2=1.12 Rsun. The equatorial velocities corresponding to the measured rotational broadenings of the spectral lines are: Veq1=90 km s-1 and Veq2=80 km s-1. Their ratio is just equal to the ratio of the stellar radii. We detected excess emission in the Halpha 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.
Based on spectral observations collected at the National Astronomical Observatory, Bulgaria.
Kjurkchieva Diana P.
Marchev Dragomir V.
Zola St.
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