Ultraviolet photometry of the Cepheid Beta Doradus from the A.N.S. satellite

Details Ultraviolet photometry of the Cepheid Beta Doradus from the A.N.S. satellite Ultraviolet photometry of the Cepheid Beta Doradus from the A.N.S. satellite

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....72...82l&link_type=abstract

Astronomy and Astrophysics, vol. 72, no. 1-2, Feb. 1979, p. 82-87. Research sponsored by the Koninklijke Nederlandse Akademie v

Astronomy and Astrophysics

Astronomy

16

Astronomical Netherlands Satellite, Cepheid Variables, Stellar Luminosity, Stellar Spectrophotometry, Ultraviolet Photometry, Light Curve, Radiant Flux Density, Shock Waves, Spectral Energy Distribution, Stellar Atmospheres, Ubv Spectra, Ultraviolet Astronomy

Scientific paper

Extensive satellite (ANS) and ground-based VBLUW photometry is presented for the Cepheid Beta Dor. These data cover the wavelength range 5500-1800 A. The ANS photometry does not confirm the evidence for shock waves as found by Hutchinson et al. (1975) from OAO 2 ultraviolet photometry of Beta Dor. A comparison of the theoretical fluxes of Kurucz (1975, 1978) with the observed energy distributions of Beta Dor gives very good agreement in the wavelength range 5500-3300 A. In the ultraviolet the agreement is still satisfactory around maximum light, but towards lower temperatures there appear discrepancies, particularly shortly after light minimum. The difference in these discrepancies on the rising and falling branches of the light curve indicates that the observed excess ultraviolet flux is probably partly due to dynamical effects in the moving atmosphere of the Cepheid.

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