1988–1991 photometry of the chromospherically active double-lined binary system HD 163621 = V835 Herculis |
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| Authors: | Douglas S Hall Gregory W Henry |
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| Institution: | (1) Dyer Observatory, Vanderbilt University, 37235 Nashville, Tennessee, USA;(2) Center of Excellence in Information Systems, Tennessee State University, 37203 Nashville, Tennessee, USA |
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| Abstract: | Photometry inV andB with a 16inch automatic telescope from 1988 to 1991 confirms the synchronous rotation suspected earlier and reveals variability
up to 0M.10 in theB bandpass at one epoch. Five spots formed with lifetimes ranging from 0.15 to 0.77 years. As with other rapid rotators, the
differential rotation coefficient (k = 0.03) is significantly smaller than that of the Sun (k = 0.19). |
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| Keywords: | Photometry individual stars HD 163621 V835Herculis variable stars binary stars starspots chromospheric activity |
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