Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...345..505k&link_type=abstract
Astronomy and Astrophysics, v.345, p.505-513 (1999)
Astronomy and Astrophysics
Astrophysics
16
Stars: Binaries: Eclipsing, Stars: Oscillations, Stars: Variables: General, Galaxy: Open Clusters And Associations: Individual: Ngc 869 = H Per
Scientific paper
In the course of the search for B-type pulsators in the central region of h Persei, we discovered two beta Cephei stars, Oo 692 and Oo 992, and one SPB star, Oo 893. The first two stars are monoperiodic pulsators with periods of 0.1716946 and 0.1326359 d respectively, and semi-amplitudes smaller than 0.01 mag. The light curve of Oo 893 can be described by a single 1.193633-day period, slightly non-sinusoidal in shape, and having semi-amplitudes from 19 mmag in I to 48 mmag in U. Oo 893 is the first SPB star found in h and chi Persei. In addition, we discovered seven other variables, including three eclipsing binaries and one lambda Eri star. One of the binaries is a W UMa-type star and a likely cluster member. We also present new UBV photometry for 258 stars in the field. The average reddening, estimated from the cluster colour-colour diagram, amounts to E(B-V) = 0.52 mag. A 0.1 mag dispersion of reddenings within the cluster is also seen. The `Oo' numbers are following Oosterhoff (\cite{oost}).
Kołaczkowski Zbigniew
Krzesi'nski Jurek
Pigulski Andrzej
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