Chapter

Precision Spectroscopy in Astrophysics

Part of the series ESO Astrophysics Symposia pp 201-204

Planets Around Active Stars

  • J. SetiawanAffiliated withMax-Planck-Institut für Astronomie
  • , P. WeiseAffiliated withMax-Planck-Institut für Astronomie
  • , Th. HenningAffiliated withMax-Planck-Institut für Astronomie
  • , A. P. HatzesAffiliated withThüringer Landessternwarte
  • , L. PasquiniAffiliated withEuropean Southern Observatory
  • , L. da SilvaAffiliated withObservatório Nacional
  • , L. GirardiAffiliated withOsservatorio Astronomico di Padova-INAF
  • , O. von der LüheAffiliated withKiepenheuer-Institut für Sonnenphysik
  • , M. P. DöllingerAffiliated withEuropean Southern Observatory
    • , A. WeissAffiliated withMax-Planck-lnstitut für Astrophysik
    • , K. BiazzoAffiliated withEuropean Southern ObservatoryOsservatorio Astrofisico di Catania-INAF

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Abstract

We present the results of radial velocity measurements of two samples of active stars. The first sample contains field G and K giants across the Red Giant Branch, whereas the second sample consists of nearby young stars (d < 150 pc) with ages between 10 and 300 Myrs. The radial velocity monitoring program has been carried out with FEROS at 1.52 m ESO telescope (1999 – 2002) and continued since 2003 at 2.2 m MPG/ESO telescope. We observed stellar radial velocity variations which originate either from the stellar activity or the presence of stellar/substellar companions. By means of a bisector technique we are able to distinguish the sources of the radial velocity variation. Among them we found few candidates of planetary companions, both of young stars and G-K giants sample.