Long-Period Radial Velocity Variations in Three K Giants (original) (raw)

ADS

Abstract

Precise relative radial velocities were measured for three K giants Alpha Tau, Alpha Boo, and Beta Gem to detect planetary companions. Results reveal strong evidence for long term periodic behavior in the radial velocities: 233 days for Alpha Boo, 643 days for Alpha Tau, and 558 days for Beta Gem. These periods are considered to be too long to be due to radial pulsations. The fact that all three stars exhibit similar periods and give comparable companion masses suggests that the variability is intrinsic to the star (either rotational modulation or pulsations).

Publication:

The Astrophysical Journal

Pub Date:

August 1993

DOI:

10.1086/173002

Bibcode:

1993ApJ...413..339H

Keywords:

• Giant Stars;
• K Stars;
• Radial Velocity;
• Stellar Motions;
• Velocity Measurement;
• Long Term Effects;
• Stellar Oscillations;
• Stellar Spectra;
• Astrophysics;
• STARS: BINARIES: SPECTROSCOPIC;
• STARS: GIANTS;
• STARS: OSCILLATIONS