Geneva photometry of stars in the double cluster H and Chi Persei

Details Geneva photometry of stars in the double cluster H and Chi Persei Geneva photometry of stars in the double cluster H and Chi Persei

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26as...83...11w&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 83, no. 1, April 1990, p. 11-25. Research supported by the B

Astronomy and Astrophysics

Astronomy

30

Astronomical Photometry, B Stars, Open Clusters, Variable Stars, Color-Magnitude Diagram, Interstellar Extinction, Sky Surveys (Astronomy)

Scientific paper

Results are presented of a campaign of photometric observations of stars in the double cluster h and Chi Persei that spanned eight years. The long-time scale of the data has made it possible to discover that at least half of the brighter stars in h and Chi Persei are variable stars. It appears that most of these variables are Be stars or related objects. Accurate color-magnitude diagrams for the brightest stars of the double cluster show that the reddening is not as uniform as was assumed so far; that the observed parameters of many stars are very much affected by the high rotational velocities, and thus cannot be easily interpreted in terms of physical quantities; and that the reported age and distance differences of both clusters are probably spurious. It is noted that the large intrinsic scatter of the colors and magnitudes of the h and Chi Persei stars casts doubt on the validity of photometric calibrations that rely heavily on observations of the double cluster.

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