Properties of Am, Delta Del and Delta SCT stars in the VBLUW system

Details Properties of Am, Delta Del and Delta SCT stars in the VBLUW system Properties of Am, Delta Del and Delta SCT stars in the VBLUW system

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...121...35w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 121, no. 1, May 1983, p. 35-41.

Astronomy and Astrophysics

Astrophysics

4

A Stars, Cepheid Variables, Metallic Stars, Stellar Spectrophotometry, Binary Stars, Interstellar Extinction, Stellar Color

Scientific paper

VBLUW photometric observations of 115 Am, δ Del, and δ Sct stars are presented and discussed. The spread with respect to the main sequence in the two-colour diagrams is mainly attributed to gravity effects. Temperatures and gravities compare reasonably well with those of Davis Philip et al. (1976) based on uvbyß photometry. However, the temperatures derived by Babu and Shylaja (1981, 1982) and based on spectral energy distribution, reveal that the photometric temperatures (and thus also gravities) are underestimated. The relation between the temperature sensitive colour indices V-B (of the VBLUW system), b-y (ubvyß system) and B2-V1 (Geneva system) for A/F type stars is investigated. A PLC relation for the colour V-B is derived using Breger's (1979) relation for the colour b-y.

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