Evolution of the starspots in V478 Lyrae from 1980 to 1988

Details Evolution of the starspots in V478 Lyrae from 1980 to 1988 Evolution of the starspots in V478 Lyrae from 1980 to 1988

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..396h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 99, Jan. 1990, p. 396-404.

Astronomy and Astrophysics

Astronomy

37

Light Curve, Lyra Constellation, Starspots, Stellar Evolution, Ubv Spectra, Ultraviolet Photometry, Companion Stars, Eclipsing Binary Stars, Stellar Mass, Stellar Rotation

Scientific paper

Differential UBV photometry of V478 Lyrae from 1980 to 1988 is given and analyzed as 22 separate light curves, each spanning an average of a dozen rotation cycles. It is shown that spots on V478 Lyr appear to have lifetimes on the order of several months to a year. The amplitude of the light loss produced by a spot can change by a factor of 2 within 20 days. In the only four determinate cases, a spot came into existence at one of the two conjunctions, that is, in the middle of the hemisphere facing (or opposing) the companion star. This finding provides additional support for the picture of a four-sector longitudinal structure, aligned with the major axis of the binary, which determines where magnetically active regions develop.

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