Open AccessRadial velocity variations of the pulsating subdwarf B star PG 1605+072
Author(s) -
Woolf Vincent M.,
Jeffery C. Simon,
Pollacco Donald L.
Publication year - 2002
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.1365-8711.2002.04995.x
Subject(s) - physics , astrophysics , subdwarf , radial velocity , photometry (optics) , amplitude , star (game theory) , astronomy , stars , optics , white dwarf
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.