Analysis of the Gravity Mode of a Pulsating Gamma Doradus-type Star
JOURNAL OF OCCULTATION AND ECLIPSE (JOE); ISSN 2522-7955; No. 6, 2019
F. Davoudi1, D M. Jassur1
1Department of Theoretical Physics and Astrophysics, Tabriz University, Tabriz 51664, Iran
Abstract
In recent decades, asteroseismology has become a powerful tool in checking models for the structure and evolution of stars. From the perspective of asteroseismology, pulsating stars are invaluable. For this type of star, Doradus-type stars have a special feature. Since the atmosphere of such stars is in the transition phase from radiant state to convection state, gravity mode oscillations are visible in these stars. Since gravity modes are originated from central stellar regions, detecting them provides valuable information about these regions.
In this study, photometric data of KIC11826272 provided by the Kepler satellite has been analyzed. The gravity mode’s pattern and the average period have been determined. Deviation from the uniform in the form of a pattern is due to the mean rotation of the star. The rotational frequency splitting effect has increased the gravity mode’s frequency. A decaying deviation found in the pattern represents prograde modes that are moving in the direction of rotation of the star. Finally, the degree of gravity mode has been determined.
Keyword: Asteroseismology, Gravity modes
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1Department of Theoretical Physics and Astrophysics, Tabriz University, Tabriz 51664, Iran
Abstract
In recent decades, asteroseismology has become a powerful tool in checking models for the structure and evolution of stars. From the perspective of asteroseismology, pulsating stars are invaluable. For this type of star, Doradus-type stars have a special feature. Since the atmosphere of such stars is in the transition phase from radiant state to convection state, gravity mode oscillations are visible in these stars. Since gravity modes are originated from central stellar regions, detecting them provides valuable information about these regions.
In this study, photometric data of KIC11826272 provided by the Kepler satellite has been analyzed. The gravity mode’s pattern and the average period have been determined. Deviation from the uniform in the form of a pattern is due to the mean rotation of the star. The rotational frequency splitting effect has increased the gravity mode’s frequency. A decaying deviation found in the pattern represents prograde modes that are moving in the direction of rotation of the star. Finally, the degree of gravity mode has been determined.
Keyword: Asteroseismology, Gravity modes
