Journal
ASTRONOMY & ASTROPHYSICS
Volume 468, Issue 3, Pages 1039-1044Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20066793
Keywords
stars : rotation; stars : fundamental parameters; stars : starspots
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Aims. We wanted to determine the rotation parameters of GQ Lup A, thereby constraining the evolutionary history of the GQ Lup system. Methods. We have undertaken a photometric monitoring campaign on GQ Lup A consisting of two epochs spaced one year apart. We also searched the photometric archives to enlarge the data set. Results. We were able to determine the photometric period (8.45 +/- 0.2 days) in both epochs in several photometric bands. This periodicity could also be found in some of the archival data. The combined false-alarm probability is 0.015. The variation is most likely caused by hot spots on the surface of GQ Lup A. This, combined with high-resolution spectra (upsilon sin i) allows calculation of GQ Lup A's inclination (i = 27 +/- 5 degrees). Radial velocity data also contains this period but is inconclusive. Nevertheless, the RV data supports the interpretation that hot spots cause the photometric variation. We use the known K-band variability, amplitude, and phase of GQ Lup A together with a new image of GQ Lup A+b, taken quasi-simultaneously with our monitoring of the star, to confirm the magnitude and, hence, luminosity of the companion.
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