Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aj.....87.1395k&link_type=abstract
Astronomical Journal, vol. 87, Oct. 1982, p. 1395-1408.
Astronomy and Astrophysics
Astronomy
54
Abundance, Blue Stars, Carbon Stars, Giant Stars, Horizontal Branch Stars, Stellar Color, Stellar Temperature, Helium, Metals, Stellar Spectra
Scientific paper
Image tube scanner observations have been made for a sample of field c-type RR Lyraes. Using these spectra, it is shown how Preston's metal abundance indicator Delta-S can be applied to the RRc's to derive (Fe/H) on Butler's system. Mean temperatures for the field RRc's based on reddening free colors determined from the strength of the H-beta line. These abundances and temperatures allow the delineation of Oosterhoff groups among field stars. It is shown that, as in clusters, the Oosterhoff effect for field stars occurs star by star and not just for mean properties of the group. There is a temperature region in the field-star instability strip where the RRc's and RRab's can both exist at the same temperature. Data on the temperature boundaries of the instability strip provide no convincing case for helium abundance differences among field RR Lyraes with differing metal abundances.
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