Simultaneous time-series spectroscopy and multi-band photometry of the sdBV PG 1605+072

Details Simultaneous time-series spectroscopy and multi-band photometry of the sdBV PG 1605+072 Simultaneous time-series spectroscopy and multi-band photometry of the sdBV PG 1605+072

2003-01-30

arxiv.org/abs/astro-ph/0301604v1

Astron.Astrophys.401:289-296,2003

Astronomy and Astrophysics

Astrophysics

8 pages, 12 figures, accepted by A&A

Scientific paper

10.1051/0004-6361:20030122

We present time-series spectroscopy and multi-band photometry of the sdBV PG 1605+072 carried out simultaneously at the Calar Alto 2.2m and 3.5m telescopes. The periodogram analysis of the radial velocity curves reveals three frequencies at 2.078, 2.756, and 1.985 mHz for Hbeta and at 2.076, 2.753, and 1.978 mHz for Hgamma. The corresponding radial velocity amplitudes are 12.7, 8.0, and 7.9 km/s for Hbeta and 14.3, 6.5, and 7.2 km/s for Hgamma. Furthermore, we found five frequencies that are present in all wavelength bands of the BUSCA photometer. The frequencies detected in the radial velocity curves are recovered by the photometric measurements. Moreover, additional frequencies were present in the periodograms which could not be identified in all four bands simultaneously. The comparison of the amplitudes presented here with previous results from radial velocity and photometric observations of PG 1605+072 shows a significant change or even switch in the power of the modes within short time scales, i. e. about one year. No changes in frequency were registered and the phases of the modes show no wavelength dependency within our multi-band photometry.

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