Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90..333e&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 90, Feb. 1985, p. 333-340.
Astronomy and Astrophysics
Astronomy
30
Red Giant Stars, Star Clusters, A Stars, Astrometry, Astronomical Catalogs, Astronomical Photometry, Radial Velocity, Stellar Luminosity, Variable Stars
Scientific paper
The membership of bright, red giants in the Hyades Supercluster is determined by studying their proper motions and their radial velocities. At least 44 of the giants in the Bright Star Catalogue are found to be members of the Supercluster, including the known variables R Hya, Pi' Grum TW Hor, NP Pup, R Lyr, VZ Cam, and AD Cet. The nearest member at 29 pc is HR 2715, which is also the oldest at 10 to the 9th yr. The variables contain a mixture of modes of pulsation and no period-luminosity relation is found. The majority of the members are G8 to K0 stars and the lone billion-yr old member is all that is expected from the number of A stars of that age in the Supercluster. The available intermediate-band photometry gives luminosities in reasonable agreement with the astrometric values and, together with DDO photometry, shows consistency in the heavy-element abundance of G- and K-type Supercluster members.
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