Open AccessTime‐series spectroscopy of pulsating sdB stars – III. Line indices of PG 1605+072
Author(s) -
O'Toole S. J.,
Jørgensen M. S.,
Kjeldsen H.,
Bedding T. R.,
Dall T. H.,
Heber U.
Publication year - 2003
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2003.06343.x
Subject(s) - balmer series , physics , astrophysics , stars , line (geometry) , amplitude , spectroscopy , star (game theory) , surface gravity , observable , spectral line , emission spectrum , astronomy , optics , geometry , quantum mechanics , mathematics
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 Hβ. 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.