Abstract
ABSTRACT A search for small-amplitude variability among members of old stellar populations reveals no variability 0'!'01 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 8 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 0'!'017 for three hours. Teff and log g of ten high-velocity, short-period variables are similar to those of the 8 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. Key words: stellar pulsation - subdwarfs - dwarf cepheids - 8 Scuti stars
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