Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010a%26a...517a..24k&link_type=abstract
Astronomy and Astrophysics, Volume 517, id.A24
Astronomy and Astrophysics
Astrophysics
2
Binaries: Close, Binaries: Spectroscopic, Stars: Emission-Line, Be, Stars: Fundamental Parameters, Stars: Individual: O Cas
Scientific paper
The analysis of radial velocities of the Be star o Cas from spectra taken between 1992 and 2008 at the Ondřejov Observatory and the Dominion Astrophysical Observatory allowed us to reconfirm the binary nature of this object, first suggested by Abt and Levy in 1978, but later refuted by several authors. The orbital parameters of this SB1 system imply a very high mass function of about one solar mass. This in turn leads to a very high mass of the secondary, possibly higher than that of the primary. In order to look for such a massive secondary, o Cas was observed with the Navy Prototype Optical Interferometer, which allowed the binary components to be spatially resolved for the first time. The interferometric observations lead to the detection of a secondary, about 3 mag fainter than the primary. The possible properties of this peculiar binary system and the reasons why the massive secondary does not dominate the optical spectrum are discussed.
Based on new spectroscopic, photometric and interferometric observations from the following observatories: Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council of Canada, Hvar, Navy Prototype Optical Interferometer, and Astronomical Institute AS CR Ondřejov.Appendices are only available in electronic form at http://www.aanda.org
Bozic Hrvoje
Harmanec Petr
Hummel Christian A.
Koubsky Pavel
Ruzdjak Domagoj
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