Uvby-beta photometry of stars in the Michigan Spectral Catalogue. I - The Delta Del stars

Details Uvby-beta photometry of stars in the Michigan Spectral Catalogue. I - The Delta Del stars Uvby-beta photometry of stars in the Michigan Spectral Catalogue. I - The Delta Del stars

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.189....1k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 189, Oct. 1979, p. 1-11.

Astronomy and Astrophysics

Astronomy

16

Astronomical Catalogs, Giant Stars, Stellar Spectrophotometry, Ubv Spectra, F Stars, Line Spectra, Metallic Stars, Stellar Luminosity, Stellar Magnitude

Scientific paper

uvby-beta photometry of 74 stars classified as Delta Del in Volume 1 of the Michigan Spectral Catalogue is presented. The photometry is in agreement with the spectral classification in that it indicates Delta Del stars are metal-line-enhanced stars with equivalent-temperature types of A9 + or - 2 subtypes. There is a discrepancy between the luminosity implied from the delta c1 index and the spectral classification. It is argued that c1 is an inadequate luminosity indicator for some late A- to early F-type stars. Several of the Delta Del stars are known Delta Scuti pulsators, and some comments on the metallicism-pulsation relation are made.

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