Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.2104h&link_type=abstract
American Astronomical Society, AAS Meeting #211, #21.04; Bulletin of the American Astronomical Society, Vol. 39, p.772
Astronomy and Astrophysics
Astronomy
Scientific paper
Recently a number of giant extrasolar planets have been discovered around K giant stars. These discoveries are important because many of
these giant stars have intermediate masses in the range 1-3 Msun. Early-type main sequence stars of this mass range have been avoided by radial velocity planet search surveys due the difficulty of getting the requisite precision for planet discoveries. Thus, K giant stars can tell us about planet formation for stars more massive than the sun. However, the determination of stellar masses for giant stars is difficult due to the fact that evolutionary tracks for stars covering a wide range of masses converges to the same region of the H-R diagram. We report here the discovery of stellar oscillations around a number of planet hosting giant stars. In particularly, we present radial velocity measurements for Beta Gem that show at least 6 pulsation modes centered on a frequency of 89 micro Hz. The frequency spacing of these modes are consistent with p-mode oscillations for a giant star having a mass of 1.9 Msun. An investigation of stellar oscillations in planet hosting K giant stars offers us the possiblity of getting an independent determination of the stellar mass for these objects which are of crucial importance for extrasolar planet studies.
Hatzes Artie P.
Zechmeister Mathias
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