Three long-period contact or semi-detached binary systems

Details Three long-period contact or semi-detached binary systems Three long-period contact or semi-detached binary systems

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989cha%26a..13..181l&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 13, Issue 2, p. 181-187.

Astronomy and Astrophysics

Astrophysics

Scientific paper

In this paper we analyse the photometric data of three long-period binaries and point out that 5 Ceti and CoD-30 5135 are contact systems with respective periods of 96.41 and 158.0 days, and that HD 104901 B is a semi-detached system of period 106.6 days. Combining all the available spectroscopic observations, we derived the absolute dimensions of 5 Ceti: the main star has a mass of 94 Msolar and a radius of 246 Rsolar. If this is confirmed then 5 Ceti will be the star with the largest known mass. On the mass-radius diagram, 5 Ceti is located far from the ZAMS line, showing that it is a highly evolved system. Containing a supergiant or giant component may be a common characteristic of long-period, contact or semi-detached systems. These provide a good opportunity for studying the matter exchange and chromospheric and coronal activities in close binaries.

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