Time-series Spectroscopy of Pulsating sdB stars III: Line Indices of PG1605+072

Details Time-series Spectroscopy of Pulsating sdB stars III: Line Indices of PG1605+072 Time-series Spectroscopy of Pulsating sdB stars III: Line Indices of PG1605+072

2002-12-10

arxiv.org/abs/astro-ph/0212220v1

Mon.Not.Roy.Astron.Soc. 340 (2003) 856

Astronomy and Astrophysics

Astrophysics

8 pages, 9 figures, to appear in MNRAS. A high resolution version of Figure 3 can be found at http://www.sternwarte.uni-erla

Scientific paper

10.1046/j.1365-8711.2003.06343.x

We present the detection and analysis of line index variations in the pulsating sdB star PG 1605+072. We have found a strong dependence of line index amplitude on Balmer line order, with high-order Balmer line amplitudes up to 10 times larger than H-beta. Using a simple model, we have found that the line index may not only be dependent on temperature, as is usually assumed for oscillating stars, but also on surface gravity. This information will provide another set of observables that can be used for mode identification of sdBs.

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