Radial velocity variations of the pulsating subdwarf B star PG 1605+072 |
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| Authors: | Vincent M Woolf C Simon Jeffery Donald L Pollacco |
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| Institution: | 1Armagh Observatory, College Hill, Armagh BT61 9DG;2Isaac Newton Group, La Palma, Apartado de correos 321, E-38700 Santa Cruz de la Palma, Tenerife, Spain;3Queens University Belfast, Belfast BT7 1NN |
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| Abstract: | We present an analysis of high-speed spectroscopy of the pulsating subdwarf B star PG 1605+072. Periodic radial motions are detected at frequencies similar to those reported for photometric variations in the star, with amplitudes of up to 6 km s?1. Differences between relative strengths for given frequency peaks for our velocity data and previously measured photometry are probably a result of shifting of power between modes over time. Small differences in the detected frequencies may also indicate mode-shifting. We report the detection of line-shape variations using the moments of the cross-correlation function profiles. It may be possible to use the moments to identify the pulsation modes of the star. |
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| Keywords: | stars: individual: PG 1605+072 stars: oscillations subdwarfs stars: variables: other |
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