New UBV photometry for the open cluster Stock 14 and its Cepheid-like variable V810 Centauri /= HR 4511/

Astronomy and Astrophysics – Astronomy

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Cepheid Variables, Open Clusters, Supergiant Stars, Ubv Spectra, Companion Stars, Early Stars, Stellar Color, Stellar Winds

Scientific paper

New UBV photometry is presented for stars brighter than V of about 14 lying in the central portion of the open cluster Stock 14. These data help to strengthen the cluster main-sequence fit, and result in a newly-determined cluster distance of 2.78 kpc within 0.12 kpc, and an inferred cluster age of around 4-8 million years. The derived luminosity for the member, Cepheid-like, supergiant variable V810 Cen, which has a characteristic period of about 130 days is equal to -7.9. Its recently-discovered, hot, blue companion is comparable in luminosity to bright, giant, B-type stars lying on the evolved portion of the cluster main sequence, a result which is reasonably consistent with estimates of the star's luminosity inferred from published ultraviolet spectroscopic observations, provided that it has an abnormally strong stellar wind for its luminosity.

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