The binary Cepheid DL CAS and the open cluster NGC 129

Details The binary Cepheid DL CAS and the open cluster NGC 129 The binary Cepheid DL CAS and the open cluster NGC 129

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94..403h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 94, Aug. 1987, p. 403-408.

Other

16

A Stars, Binary Stars, Cepheid Variables, Open Clusters, Supergiant Stars, Orbital Elements, Radial Velocity, Stellar Rotation

Scientific paper

The cepheid DL Cas and the nonvariable supergiant Star A are confirmed as members of NGC 129, and both are found to be spectroscopic binaries with orbital periods of a few years. Periods and orbits are determined for both stars. Star A is apparently rotating; tidal interaction with its companion is discussed and then rejected as the probable cause of the rotation. The membership of other stars and the velocity of the cluster are redetermined.

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