Photometry of balloon 090100001 with the Himalayan Chandra Telescope

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Title:	Photometry of balloon 090100001 with the Himalayan Chandra Telescope
Author(s):	Ahmad, A.; Jeffery, C.S.; Aerts, C.C. ; Fontaine, G.; Charpinet, S.
Publication year:	2007
Source:	Bulletin of the Astronomical Society of India, vol. 35, (2007), pp. 67-75
ISSN:	0304-9523
Related links:	http://ukads.nottingham.ac.uk/abs/2007BASI...35...67A
Publication type:	Article / Letter to editor
Please use this identifier to cite or link to this item : http://hdl.handle.net/2066/36320
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Subject:	Astronomy
Organization:	Astrophysics
Journal title:	Bulletin of the Astronomical Society of India
Volume:	vol. 35
Page start:	p. 67
Page end:	p. 75
Abstract:	About one tenth of all hot subluminous B stars pulsate non-radially with periods of 80 -- 600s; the oscillations are identified with pressure modes. At lower effective temperatures, another group pulsates non-radially with periods > 3,000,s; these oscillations have been identified with gravity modes. If sufficient modes can be identified, such oscillations can provide information about the interior of a star. One pulsating sdB star -- balloon 090100001 -- lies at the boundary of the hot and cool groups, and shows both short and long-period oscillations. To study its interior structure in detail, we carried out a multi-site observing campaign in 2005 August in order to obtain a very precise light curve and hence to identify the modes of oscillation. This campaign involved four telescopes including the Himalayan Chandra Telescope (HCT), the William Herschel Telescope (in La Palma), the Canada France Hawaii Telescope and the Faulkes Telescope North (both in Hawaii). Here we report the HCT observations of balloon 090100001.