Astronomy and Astrophysics – Astronomy
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89..655a&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 89, May 1984, p. 655-662.
Astronomy and Astrophysics
Astronomy
5
A Stars, B Stars, Star Clusters, Stellar Luminosity, Stellar Spectra, Stellar Spectrophotometry, F Stars, Stellar Evolution, Stellar Rotation, Ubv Spectra
Scientific paper
Photoelectric uvby observations have been obtained for stars in the mid-B to early-A spectral range in the fields of M39 and δ Lyrae. The color and luminosity calibrations of Crawford for B, A, and F stars have been employed, as well as the new calibration for A0 stars of Hilditch et al. (1983). The resulting distance modulus for M39 is 7.23, with a mean E(b-y) color excess of 0.025. A distance modulus of 7.29 and a mean reddening of 0.032 has been derived for ten stars in the field of δ Lyrae, but the existence of a cluster is not strongly indicated in the present study. Comparison of photometric and rotational velocity data for the M39 stars confirms a correlation between δc0 and rotational velocity for A and A0 stars, and suggests that an evolutionary correction of only -3δc0 be employed for stars in both spectral classes.
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