Remarks on the period variation of HS Herculis and SW Cygni

Details Remarks on the period variation of HS Herculis and SW Cygni Remarks on the period variation of HS Herculis and SW Cygni

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994an....315..349t&link_type=abstract

Astronomische Nachrichten (ISSN 0004-6337), vol. 315, no. 5, p. 349-352

Astronomy and Astrophysics

Astronomy

11

Eccentric Orbits, Eclipsing Binary Stars, Periodic Variations, Apsides, Minima

Scientific paper

In order to get a satisfactory understanding of the periodic variation of the orbital period in the binary system HS Herculis, the study of this problem is resumed. Using recently observed primary and secondary minima, it is evident that after 1955 (E greater than -2000) the corresponding O - C diagram reflects the effect of apsidal motion. Any assumption on the presence of a third body is rejected, at least as long as the current aspect of the O- C diagram is concerned. For the interpretation of the sinusoidal period variation of the semi-detached system SW Cygni, 130 primary minima were compiled from the literature. Though it is considered as very likely that this variation of the period is primarily caused by apsidal motion, the hypothesis of a third body is analyzed too. Further precise photometric and spectroscopic observations are recommended.

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