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Issue A&A
Volume 383, Number 1, February III 2002
Page(s) 197 - 201
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20011725



A&A 383, 197-201 (2002)
DOI: 10.1051/0004-6361:20011725

Research Note

Time series analysis of V511 Lyrae photometry

J. Lyytinen1, P. Johansson1, L. Jetsu1, E. Esko1, T. Hackman1, D. S. Hall2, G. W. Henry3, S. Kontinen1, P. Könönen1, 4, S. Maisala1, A. Palviainen1 and K. Ryynänen1

1  Observatory, PO Box 14, 00014 University of Helsinki, Finland
2  Dyer Observatory, Vanderbilt University, Nashville, TN 37235, USA
3  Center of Excellence in Information Systems, Tennessee State University, 330 10th Ave. North, Nashville, TN 37203-3401, USA
4  Helsinki University of Technology, Metsähovi Radio Research Station, Metsähovintie, 02540 Kylmälä, Finland

(Received 25 August 2000 / Accepted 26 November 2001)

Abstract
Our time series analysis of sixteen BV light curves of the chromospherically active binary V511 Lyr confirmed the $2\fd7$ rotation period uniquely. The seasonal periodicity changes of 3.8% indicated the presence of detectable surface differential rotation. The significant $2\fd67455$ periodicity in the light curve minimum epochs suggested that the strongest starspot formation in V511 Lyr was concentrated on one stable active longitude.


Key words: stars: individual: V511 Lyr (HDE 337518) -- stars: variable: general -- stars: activity -- techniques: photometric

Offprint request: L. Jetsu, jetsu@astro.helsinki.fi

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