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A&A 437, L51L54 (2005) DOI: 10.1051/0004-6361:200500136

Summary: A&A 437, L51L54 (2005)
DOI: 10.1051/0004-6361:200500136
c ESO 2005
Discovery of pulsation in a helium-rich subdwarf B star
A. Ahmad and C. S. Jeffery
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland, UK
e-mail: amir@star.arm.ac.uk
Received 7 January 2005 / Accepted 1 June 2005
Abstract. Helium-rich subdwarf B (He-sdB) stars form a very small inhomogeneous group of subluminous stars showing
varying degrees of helium enrichment. They have been found in the field of our galaxy as well as in globular clusters. Here we
report the first discovery of pulsation in a He-sdB star LS IV-14
116. Two pulsation periods can be clearly identified (1950
and 2900 s) and are more likely to be due to high-order non-radial g-mode oscillations than to radial or non-radial p-modes.
Key words. stars: chemically peculiar stars: early-type subdwarfs stars: individual: LS IV-14
116 stars: oscillations
1. Introduction
Pulsations in stars can arise when a local maximum in opac-


Source: Armagh Observatory
Jeffery, Simon - Armagh Observatory


Collections: Physics