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A SURVEY FOR SMALL-AMPLITUDE VARIABILITY AMONG POPULATION II STARS
R. S. McMILLAN, M. BREGER, G. J. FERLAND and G. L. LOUMOS
Publications of the Astronomical Society of the Pacific
Vol. 88, No. 524 (August 1976), pp. 495-509
Published by: Astronomical Society of the Pacific
Stable URL: http://www.jstor.org/stable/40675958
Page Count: 15
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A search for small-amplitude variability among members of old stellar populations reveals no variability > 0ṃ01 among 15 metal-deficient or high-velocity F- and G-type subdwarfs, 13 old-disk main-sequence F stars, four cluster blue stragglers, and seven blue horizontal-branch field stars. Variability was detected in two A-type stars: A metal-deficient main-sequence A star, BDS 1269A = HD 15165 is shown to have Î´ Scuti-like variability, and the variability of the high-velocity field blue straggler HD 100363 reported by Eggen (1971) is confirmed. The high-velocity sdAp star GD-210, a suspected variable, showed no amplitude > 0ṃ017 for three hours. Teff and log g of ten high-velocity, short-period variables are similar to those of the δ Scuti stars with Teff ≤ 7800° K, although the low-mass variables in the sample probably do not share the same evolutionary history as the higher-mass field blue stragglers.
Publications of the Astronomical Society of the Pacific © 1976 The University of Chicago Press