Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-12-14
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Accepted by A&A, 5 pages, 2 figures, 4 tables
Scientific paper
Solar-like oscillations have been observed by {{\it Kepler}} and CoRoT in several solar-type stars. We study the variations of stellar p-mode linewidth as a function of effective temperature. Time series of 9 months of Kepler data have been used. The power spectra of 42 cool main-sequence stars and subgiants have been analysed using both Maximum Likelihood Estimators and Bayesian estimators, providing individual mode characteristics such as frequencies, linewidths and mode heights. Here we report on the mode linewidth at maximum power and at maximum mode height for these 42 stars as a function of effective temperature. We show that the mode linewidth at either maximum mode height or maximum amplitude follows a scaling relation with effective temperature, which is a combination of a power law plus a lower bound. The typical power law index is about 13 for the linewidth derived from the maximum mode height, and about 16 for the linewidth derived from the maximum amplitude while the lower bound is about 0.3 microHz and 0.7 microHz, respectively. We stress that this scaling relation is only valid for the cool main-sequence stars and subgiants, and does not have predictive power outside the temperature range of these stars.
Aguirre Victor Silva
Antia H. M.
Appourchaux Thierry
Bedding Tim R.
Benomar Othman
No associations
LandOfFree
Oscillation mode linewidths of main-sequence and subgiant stars observed by Kepler does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Oscillation mode linewidths of main-sequence and subgiant stars observed by Kepler, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Oscillation mode linewidths of main-sequence and subgiant stars observed by Kepler will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-228089