Title: Radial velocities of giant stars: an investigation of line profile variations. - art. no. 012058
Authors: Hekker, S
Snellen, I. A. G
Aerts, Conny
Quirrenbach, A
Reffert, S
Mitchell, D. S #
Issue Date: 2008
Publisher: Iop publishing ltd
Host Document: Proceedings of the second helas international conference: helioseismology, asteroseismology and mhd connections vol:118 pages:12058-12058
Series Title: Journal of Physics Conference Series
Conference: International Conference on Helioseismology, Asteroseismology and MHD Connections (HELAS II) Gottingen, GERMANY, AUG 20, 2007-AUG 24, 2008
Abstract: Since 1999, a radial velocity survey of 179 red giant stars is ongoing at Lick Observatory with a one month cadence. At present similar to 20-100 measurements have been collected per star with an accuracy of 5 to 8 m s(-1). Of the stars monitored, 145 (80%) show radial velocity (RV) variations at a level >20 m s(-1), 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.
ISBN: *****************
ISSN: 1742-6588
Publication status: published
KU Leuven publication type: IC
Appears in Collections:Institute of Astronomy
# (joint) last author

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