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J. Astrophys. Astr. (0000) 00, 000000 Pulsations in Subdwarf B stars

Summary: J. Astrophys. Astr. (0000) 00, 000000
Pulsations in Subdwarf B stars
C. Simon Jeffery1
Armagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland
2005 May 6
Abstract. Subdwarf B stars play a significant role in close binary
evolution and in the hot star content of old stellar populations, in par-
ticular in giant elliptical galaxies. While the question of their origin
poses several problems for stellar evolution theory, one of their most
fascinating properties is the presence of multi-periodic 23 minute os-
cillations. Interpreting these oscillations optimally requires the correct
identification of the modes. Partial identifications can be obtained us-
ing high-speed observations of radial velocity and colour variations.
We review some of the several attempts to make such observations,
most recently with the Multi-Site Spectroscopic Telescope campaign
and with ULTRACAM.
Key words: stars: oscillations stars: variables: other (EC14026/sdBV)
stars: individual: KPD2109+4401, PB8783, PG1605+072, HS0039
+4302, PG0014+067.


Source: Armagh Observatory


Collections: Physics