Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98..581j&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, June 1986, p. 581-598. Research supported by Brigha
Astronomy and Astrophysics
Astronomy
16
Stellar Spectrophotometry, Variable Stars, Color-Magnitude Diagram, Light Curve, Metallicity, Spectrum Analysis, Stellar Temperature, Turbulence
Scientific paper
The spectroscopic data collected on the HD 200925 variable star in the uvby and beta systems have been analyzed. The results indicate that this variable is multiperiodic, with a reddening value, E(b-y), equal to 0.029 mag. The reddening-corrected normals for y, (b-y), and c(1) yielded a mean effective temperature of 7020 K, mean log surface gravity of 3.44, and a mean bolometric magnitude of 0.8 mag. A preliminary mean radius of 4.1 solar radii has been determined. The m(1) data show that the blanketing is high, but this index varied in an anomalous way which precluded a definitive determination of Fe/H. Two possible explanations are considered for the behavior of the m(1) index: (1) a high microturbulence excited by the secondary pulsation mode, and (2) the Am/Fm phenomenon.
Johnson Scott B.
Joner Michael D.
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