現在の位置 : TOPページ談話会案内2013年度 > 第1369回 天文学教室談話会

第1369回 天文学教室談話会

日時

2013年10月21日(月) 13:30

場所

大輪講室

講演者

Prof. Don Kurtz(Jeremiah Horrocks Institute, University of Central Lancashire, UK)

題目

Asteroseismology: A New Keplerian Revolution

要旨

In 1926 in the opening paragraph of his now-classic book, The Internal Constitution of the Stars, Sir Arthur Eddington lamented, “What appliance can pierce through the outer layers of a star and test the conditions within?” While he considered theory to be the proper answer to that question, there is now an observational answer: asteroseismology. We are in a time of a significant advance in our understanding of stellar astrophysics with data from the Kepler Mission. >From its rich 4-year data set more than 3500 exoplanet candidates were discovered - the majority of all known. Kepler has also improved our ability to see pulsations and variability in stars by 100 to 1000 times compared with ground-based telescopes, allowing us to probe stars using asteroseismology. We are seeing as never before: heartbeat stars, novel eclipsing stars, spots, flares and magnetic cycles as in our own Sun. Astrophysics that used to be theoretical is now also observational: gravitational lensing in eclipsing binary stars; Doppler boosting; multiple pulsation axes; period doubling; tidal excitation. Kepler data for solar-like stars are now comparable to data for the Sun seen as a star, giving us masses, radii and ages for hundreds of single stars, allowing determination of their orbiting planets’ sizes, and giving new constraints on stellar evolution theory. This talk will introduce the concepts of asteroseismology and show a selection of exciting observational results from the Kepler mission.

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【The Colloquium Committee in 2013】
Shijun Yoshida (yoshida<at>astr.tohoku.ac.jp)
Takahiro Masuda (takahiro.masuda<at>astr.tohoku.ac.jp)
Mihoko Kato (m.kato<at>astr.tohoku.ac.jp)
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