Main-sequence broadening in the double cluster H and Chi Persei

Details Main-sequence broadening in the double cluster H and Chi Persei Main-sequence broadening in the double cluster H and Chi Persei

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.169..109d&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 169, no. 1-2, July 1990, p. 109-111. Research supported by FRFC.

Astronomy and Astrophysics

Astrophysics

3

Color-Magnitude Diagram, Main Sequence Stars, Star Clusters, Astronomical Photometry, B Stars, Variable Stars

Scientific paper

Precise photometric observations of stars in the double cluster h and Chi Persei reveal a large spread in the colors and magnitudes of the upper main sequence; half of the stars are variables that are Be stars or related stars. The reported age difference between both clusters is found to be spurious. Rotation apparently affects both the intrinsic and the observed colors of the early-type stars in h and Chi Persei. This result questions the validity of photometric calibrations that heavily rely on h and Chi Persei or similar clusters.

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