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A spectroscopic, photometric, and magnetic study of the starspot on II PegasiA 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.
Document ID
19810061592
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Vogt, S. S. (Lick Observatory Santa Cruz, CA, United States)
Date Acquired
August 11, 2013
Publication Date
August 1, 1981
Publication Information
Publication: Astrophysical Journal
Subject Category
ASTRONOMY
Funding Number(s)
CONTRACT_GRANT: NGR-40-012-152
CONTRACT_GRANT: NSF AST-75-02404
Distribution Limits
Public
Copyright
Other