Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....97..403t&link_type=abstract
Astronomy and Astrophysics, vol. 97, no. 2, Apr. 1981, p. 403-406.
Astronomy and Astrophysics
Astrophysics
4
Binary Stars, Open Clusters, Star Distribution, Stellar Rotation, Astronomical Photometry, F Stars, Hertzsprung-Russell Diagram, Main Sequence Stars, Mass Ratios
Scientific paper
Rotating stars and binaries, both of which fall above the normal main sequence in an HR diagram, can, in principle, be distinguished using Stromgren four-color photometry. An attempt is made here to make this distinction for unevolved stars in six young open clusters. A straightforward interpretation of the data implies that the approximately 45-50% of A and F stars lying more than 0.07 magnitude above the main sequence are about equally divided between binaries with secondary/primary mass ratios greater than approximately 0.5 and stars rotating greater than approximately 30% (greater than approximately 75 km/s) faster than their cluster averages. This is in reasonable agreement with other determinations of binary incidence in young clusters and the field. But, because the six cluster do not define the same main sequence in a c0, b-y diagram (Praesepe especially being discordant), the possibility should be left open that some other parameter may be influencing colors of main sequence stars in young clusters at the 0.05 magnitude level. As a result, it may not be practical to determine binary incidence from photometry of distant, young clusters.
Ostriker Jeremiah P.
Trimble Virginia Louise
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