Radial velocity variations of G and K giants

Details Radial velocity variations of G and K giants Radial velocity variations of G and K giants

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006tafp.conf..138d&link_type=abstract

"Tenth Anniversary of 51 Peg-b: Status of and prospects for hot Jupiter studies. Colloquium held at Observatoire de Haute Proven

Computer Science

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Scientific paper

G and K giants are a new class of radial velocity (RV) variables. In order to reveal the reasons of this variability we started in February 2004 a program to observe a northern sample of 62 K giants from the Thüringer Landessternwarte Tautenburg (TLS) with the aim of using accurate radial velocity measurements to determine the fraction of K giants showing long-term and short-period variations. Our first results show a typical RV precision of 3 to 5 m s^{-1}. About 15 % of the star sample exhibits long-term RV variations on time scales of several hundreds of days. Among these, for one program star we have a good time coverage, and the long-term variations may be due to a planetary companion.

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