Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97.1139f&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, April 1989, p. 1139-1146.
Astronomy and Astrophysics
Astronomy
34
Binary Stars, Chromosphere, Stellar Activity, Stellar Composition, Stellar Orbits, Cygnus Constellation, Orbital Elements, Stellar Rotation
Scientific paper
Improved orbital elements have been determined for 39 Ceti and HD 185151.39 Cet has a circular orbit with an orbital period of 56.82 days, which differs substantially from its rotational period of 75-78 days. An observation of the lithium region of 39 Cet shows that the G5 III component has almost no lithium in its outer atmosphere. HD 185151 has a circular orbit with an orbital period of 40.142 days and has a nearly identical rotational period. The large mass function suggests that the secondary is a late A to mid F type star whose continuum should be visible at ultraviolet wavelengths. The orbital inclination is estimated to be 62 + or - 12, while the distance is about 390 pc. Orbital and rotational periods are compared for 114 chromospherically active binaries.
Eitter Joseph J.
Fekel Francis C.
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