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- W1968909892 abstract "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 δc<SUB>0</SUB> and rotational velocity for A and A0 stars, and suggests that an evolutionary correction of only -3δc<SUB>0</SUB> be employed for stars in both spectral classes." @default.
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- W1968909892 date "1984-05-01" @default.
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- W1968909892 title "UVBY photometry in M39 and Delta Lyrae" @default.
- W1968909892 doi "https://doi.org/10.1086/113562" @default.
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