Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...272..196a&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 272, Sept. 1, 1983, p. 196-201. Research supported by the Research Corp.
Astronomy and Astrophysics
Astrophysics
23
F Stars, Light Curve, Starspots, Stellar Models, Stellar Rotation, Variable Stars, Binary Stars, Radial Velocity, Stellar Spectrophotometry, Ubv Spectra
Scientific paper
This star shows light variations by 0.05 mag in a period of about 0.815 deg, but there are substantial differences from cycle to cycle. Various possible explanations for the variations were explored. First, the star is not an Ap variable because its spectrum is normal (F2 IV) and it does not have the color variations that are typical of an Ap star. It is not an ellipsoidal primary because the radial velocity does not change; a lack of change in line widths excludes the possibility of its being a double-lined binary with unresolved lines. It is probably not a pulsating star because of the lack of color and velocity changes. However, the hypothesis of a single rotating spotted star fits because the rotational period (1.7 deg sin i) is compatible with the light period (0.815 deg) and it offers a natural explanation for changes from cycle to cycle in terms of changes in spot activity. It has not been possible to determine whether the spots are bright or dark ones in this rapid rotator.
Abt Helmut A.
Bollinger G.
Burke Edward W. Jr.
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