Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247..975v&link_type=abstract
Astrophysical Journal, Part 1, vol. 247, Aug. 1, 1981, p. 975-983. Research supported by the University of California
Astronomy and Astrophysics
Astrophysics
115
Binary Stars, Line Spectra, Starspots, Stellar Magnetic Fields, Stellar Spectra, Stellar Spectrophotometry, Absorption Spectra, Abundance, Emission Spectra, H Alpha Line, Light Curve, Lithium, Molecular Absorption, Stellar Motions, Stellar Temperature, Variable Stars, Zeeman Effect
Scientific paper
A description is presented of extensive observations of II Peg during 1977 and 1978, taking into account multicolor broad-band photometry, high-dispersion spectroscopy, low-dispersion spectrophotometry, and Zeeman analysis. During this time the star showed periodic light variations in excess of a 0.4 mag range attributable to the presence of a large starspot or an equivalent nonuniform surface brightness distribution. The high-precision multicolor photometry, which differed greatly from previous photometric results, illustrates that the starspots on II Peg are continually evolving on time scales of approximately 1 year or less. A low-dispersion spectrum of the large spot showed pronounced VO and TiO molecular adsorption features. A high-resolution, high signal-to-noise Reticon spectrum at lambda 6707 does not show any compelling evidence of previously reported lithium in this star.
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