Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99.1089g&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, Oct. 1987, p. 1089-1092. Research supported by the
Astronomy and Astrophysics
Astronomy
4
Open Clusters, Radial Velocity, Stellar Rotation, Stellar Spectra, Charge Coupled Devices, Stellar Color, Stellar Evolution
Scientific paper
Photographic spectra of 16 stars in NGC 2281 (= C0645+411) have been used to derive a mean E(B-V) = 0.11 mag and a true distance modulus of 8.3, in agreement with earlier studies. Radial velocities of most of the same stars were derived from low-resolution CCD spectra to yield a mean cluster velocity of +5 km/s. Rotational velocities estimated from low-dispersion photographic spectra yield a distribution of the mean v sin i's as a function of absolute magnitude typical of intermediate-age open clusters. The latter result suggests that stellar evolutionary effects largely eliminate differences in the cluster mean rotational velocity distributions by the time clusters are between 50-100 x 10 to the 6th years old.
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