Radial velocities of giant stars: an investigation of line profile variations

Details Radial velocities of giant stars: an investigation of line profile variations Radial velocities of giant stars: an investigation of line profile variations

2007-10-22

arxiv.org/abs/0710.4134v1

J.Phys.Conf.Ser.118:012058,2008

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings of the Helas II workshop: Helioseismology, Asteroseismology and MHD Connections; published in the

Scientific paper

10.1088/1742-6596/118/1/012058

Since 1999, a radial velocity survey of 179 red giant stars is ongoing at Lick Observatory with a one month cadence. At present ~20-100 measurements have been collected per star with an accuracy of 5 to 8 m/s. Of the stars monitored, 145 (80%) show radial velocity (RV) variations at a level >20 m/s, of which 43 exhibit significant periodicities. Here, we investigate the mechanism causing the observed radial velocity variations. Firstly, we search for a correlation between the radial velocity amplitude and an intrinsic parameter of the star, in this case surface gravity (log g). Secondly, we investigate line profile variations and compare these with theoretical predictions.

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