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Astron. Astrophys. 321, 1024-1026 (1997)

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Response of a star to gravitational waves

H.G. Khosroshahi 1 and Y. Sobouti 1, 2, 3

1 Institute for Advanced Studies in Basic Sciences, P.O. Box 45195-159, Zanjan, Iran (iasbsgz1@rose.ipm.ac.ir, sobouti@rose.ipm.ac.ir)
2 Department of physics, Shiraz University, Shiraz, Iran
3 Center for Theoretical Physics and Mathematics, AEOI, Tehran, Iran

Received 12 June 1996 / Accepted 21 October 1996


We investigate the possibility of the excitation of the oscillation modes of polytropic stars by gravitational waves. We decompose the displacement vector field of a normal mode into its irrotational and solenoidal components and show that the interaction with the gravitational waves takes place through the irrotational component. We calculate the absorption cross section of the waves for different modes and find that the cross section for [FORMULA] modes are orders of magnitudes larger than the [FORMULA] modes. In the [FORMULA] sequence the cross section is largest for the fundamental mode and decreases with increasing mode order.

Key words: gravitational waves – stars: oscillation – methods: numerical

Send offprint requests to: H.G. Khosroshahi

© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998