Studies of large-amplitude Delta Scuti variables. I - A case study of EH Librae

Details Studies of large-amplitude Delta Scuti variables. I - A case study of EH Librae Studies of large-amplitude Delta Scuti variables. I - A case study of EH Librae

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105..809w&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 690, p. 809-820.

Astronomy and Astrophysics

Astronomy

9

Stellar Oscillations, Variable Stars, Error Analysis, Light Curve, Stellar Luminosity, Stellar Spectrophotometry

Scientific paper

We determine the radii and luminosities of a selection of the large-amplitude Delta Sct stars. Optical and IR photometry and cross-correlated radial-velocity data have been obtained for the large-amplitude Delta Sct stars DY Herculis, EH Librae, and DY Pegasi. Fourier representations for B, V, I, and J light curves and for the radial-velocity curves were used in Baade-Wesselink analyses to derive minimum radii over the pulsation cycles. The resulting radii and their errors, mean bolometric luminosity, and mean absolute bolometric magnitudes are discussed. The Baade-Wesselink analysis yielded R(min) - 2.54 +/- 0.35 solar radii for EH Lib with a radius excursion of 0.098 solar radius. When combined with Joner's (1986) effective temperatures, we found a mean bolometric luminosity of 22.2 solar luminosities and a mean absolute bolometric magnitude of 1.38.

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