Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97..153j&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, Feb. 1985, p. 153-157. Research supported by Brigha
Astronomy and Astrophysics
Astronomy
9
Dwarf Stars, Stellar Spectrophotometry, Ubv Spectra, Variable Stars, Abundance, Cepheid Variables, Hertzsprung-Russell Diagram, Stellar Temperature
Scientific paper
Photometric observations have been carried out over ninety percent of the pulsation cycle for the variable star HD 200925. The observations were obtained using a single-channel photometer, and a photomultiplier attached to a 61-cm reflecting telescope. The instrumental indices were reduced to the standard Stromgren and beta-systems of 13 standard stars. The photometric data show that HD 200925 is multiperiodic. A reddening value of 0.040 mag was derived as the average of the variable and comparison star observations. Analysis of the intrinsic (b-y) and cl values for one primary pulsation cycle indicated a mean effective temperature of 7470 K, and a mean surface gravity of 3.87 log g. HD 200925 is found to have a somewhat higher (+0.33) Fe/H abundance ratio than stars in the Hyades. The observed magnitude and color variations of HD 200925 are reproduced in graphic form.
Johnson Scott B.
Joner Michael D.
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