The Case for Third Bodies as the Cause of Period Changes in Selected Algol Systems

Details The Case for Third Bodies as the Cause of Period Changes in Selected Algol Systems The Case for Third Bodies as the Cause of Period Changes in Selected Algol Systems

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aj....132.2260h&link_type=abstract

The Astronomical Journal, Volume 132, Issue 6, pp. 2260-2267.

Astronomy and Astrophysics

Astronomy

16

Stars: Binaries: Eclipsing, Stars: Individual: Constellation Name: Ab Andromedae, Stars: Individual (Tv Cassiopeiae), Stars: Individual (Xx Cephei), Stars: Individual (Ak Herculis), Stars: Individual (Y Camelopardalis)

Scientific paper

Many eclipsing binary star systems show long-term variations in their orbital periods, evident in their O-C (observed minus calculated period) diagrams. With data from the Robotic Optical Transient Search Experiment (ROTSE-I) compiled in the SkyDOT database, New Mexico State University 1 m data, and recent American Association of Variable Star Observers (AAVSO) data, we revisit Borkovits and Hegedüs's best-case candidates for third-body effects in eclipsing binaries: AB And, TV Cas, XX Cep, and AK Her. We also examine the possibility of a third body orbiting Y Cam. Our new data support their suggestion that a third body is present in all systems except AK Her, as is revealed by the sinusoidal variations of the O-C residuals. Our new data suggest that a third body alone cannot explain the variations seen in the O-C residuals of AK Her. We also provide a table of 143 eclipsing binary systems that have historical AAVSO O-C data with new values computed from the SkyDOT database.

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