Short Timescale Variations in the Atmosphere of Antares A
Abstract
We analyze three years of high-resolution spectroscopic data and find radial velocity variations with a characteristic timescale of 100 ± 6 days that are nearly sinusoidal. Simultaneous variations in line-depth ratios imply temperature variations of up to 100 K. No photometric variation is seen on a 100 day timescale. The timescale of the variation and its resonant nature suggest solar-like oscillations driven by large-scale convection.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 2013
- DOI:
- 10.1088/0004-637X/777/1/10
- Bibcode:
- 2013ApJ...777...10P
- Keywords:
-
- convection;
- stars: individual: alpha Sco A;
- stars: late-type;
- supergiants;
- techniques: radial velocities;
- techniques: spectroscopic