Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26as...96..497p&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 96, no. 3, p. 497-504.
Astronomy and Astrophysics
Astrophysics
24
Binary Stars, Late Stars, Starspots, Stellar Luminosity, Stellar Spectrophotometry, Light Curve, Stellar Rotation
Scientific paper
We present a decade of new starspot photometry of BY Draconis and EV Lacertae and analyze the longterm behavior in combination with data from the literature. Both stars show brightness suppression as well as brightness modulation which we interpret to imply that spots exist both near the poles and at lower latitudes. There have been spots continuously located in the polar region of BY Dra for the last 14 years. (O-C) diagrams for lightcurve minima reveal systematic, sinusoidal variations in BY Dra with a period of 13-14 years. In EV Lac the spots have been located on the same hemisphere for the last ten years. When starspot areas restructure from time to time and the lightcurve flattens, there are sometimes noticeable changes in the (O-C) diagram when the 'new' spot modulation of brightness begins.
Oláh Katalin
Pettersen Bjorn Ragnvald
Sandmann William H.
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