Journal
ASTRONOMY & ASTROPHYSICS
Volume 596, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201628531
Keywords
binaries: visual; stars: activity; techniques: radial velocities; techniques: spectroscopic
Categories
Funding
- National Aeronautics and Space Administration
- PRIN-INAF Environmental effects in the formation and evolution of extrasolar planetary systems
Ask authors/readers for more resources
Stellar activity influences radial velocity (RV) measurements and can also mimic the presence of orbiting planets. As part of the search for planets around the components of wide binaries performed with the SARG High Resolution Spectrograph at the TNG, it was discovered that HD 200466A shows strong variation in RV that is well correlated with the activity index based on H-alpha. We used SARG to study the H-alpha line variations in each component of the binaries and a few bright stars to test the capability of the H-alpha index of revealing the rotation period or activity cycle. We also analysed the relations between the average activity level and other physical properties of the stars. We finally tried to reveal signals in the RVs that are due to the activity. At least in some cases the variation in the observed RVs is due to the stellar activity. We confirm that H-alpha can be used as an activity indicator for solar-type stars and as an age indicator for stars younger than 1.5 Gyr.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available