Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....99l...1p&link_type=abstract
Astronomy and Astrophysics, vol. 99, no. 1, June 1981, p. L1-L4.
Astronomy and Astrophysics
Astrophysics
30
Abundance, Cepheid Variables, Magellanic Clouds, Metallic Stars, Stellar Spectrophotometry, Color, Stellar Luminosity, Stellar Structure
Scientific paper
A description is given of results which were obtained in studies of the photometry of SMC Cepheids conducted with the aid of the Walraven VBLUW photometric system. Twenty variables outside the dense central regions had been selected in the SMC. The results confirm the differences in VBLUW colors between galactic and SMC Cepheids reported by van Genderen (1977). They also support similar color effects found in other photometric systems. Composition is not the only possible cause of these color differences, however. An alternative has been proposed by DeYoreo and Karp (1979), who ascribe the blueness of SMC Cepheids to contamination by companions. Such an explanation is not supported by the presented data. A metal deficiency of a factor 5 with respect to the sun is obtained. This value agrees with data reported by Wallerstein (1980) and Smith (1980).
Lub Jan
Pel Jan Willem
van Genderen Arnout M.
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