SIMBAD references

2007A&A...468.1039B - Astronomy and Astrophysics, volume 468, 1039-1044 (2007/6-4)

Rotational period of GQ Lupi.

BROEG C., SCHMIDT T.O.B., GUENTHER E., GAEDKE A., BEDALOV A., NEUHAEUSER R. and WALTER F.M.

Abstract (from CDS):

We wanted to determine the rotation parameters of GQ Lup A, thereby constraining the evolutionary history of the GQ Lup system. 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. We were able to determine the photometric period (8.45±0.2days) 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 (vsini) allows calculation of GQ Lup A's inclination (i=27±5°). 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.

Abstract Copyright:

Journal keyword(s): stars: rotation - stars: fundamental parameters - stars: starspots

VizieR on-line data: <Available at CDS (J/A+A/468/1039): phot.dat photmid.dat>

Simbad objects: 10

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2020.02.19-09:26:51

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