Kepler Detected Gravity-Mode Period Spacings in a Red Giant Star
P.G.Beck, Paul × Bedding, T. R Mosser, B Stello, D Garcia, R. A Kallinger, T Hekker, S Elsworth, Y Frandsen, S Carrier, Fabien De Ridder, Joris Aerts, Conny White, T. R Huber, D Dupret, M-A Montalban, J Miglio, A Noels, A Chaplin, W. J Kjeldsen, H Christensen-Dalsgaard, J Gilliland, R. L Brown, T. M Kawaler, S. D Mathur, S Jenkins, J. M #
American Association for the Advancement of Science
Science vol:332 issue:6026 pages:205-205
Stellar interiors are inaccessible through direct observations. For this reason, helioseismologists made use of the Sun’s acoustic oscillation modes to tune models of its structure. The quest to detect modes that probe the solar core has been ongoing for decades. We report the detection of mixed modes penetrating all the way to the core of an evolved star from 320 days of observations with the Kepler satellite. The period spacings of these mixed modes are directly dependent on the density gradient between the core region and the convective envelope.