Long-term spectroscopic monitoring of the Luminous Blue Variable HD160529

Details Long-term spectroscopic monitoring of the Luminous Blue Variable HD160529 Long-term spectroscopic monitoring of the Luminous Blue Variable HD160529

2002-12-20

arxiv.org/abs/astro-ph/0212473v1

Astron.Astrophys. 400 (2003) 279-292

Astronomy and Astrophysics

Astrophysics

14 pages, 15 figures, accepted for publication in Astronomy & Astrophysics

Scientific paper

10.1051/0004-6361:20021908

We have spectroscopically monitored the galactic Luminous Blue Variable HD 160529 and obtained an extensive high-resolution data set that covers the years 1991 to 2002. During this period, the star evolved from an extended photometric minimum phase towards a new visual maximum. In several observing seasons, we covered up to four months with almost daily spectra. Our spectra typically cover most of the visual spectral range with a high spectral resolution (about 20,000 or more). This allows us to investigate the variability in many lines and on many time scales from days to years. We find a correlation between the photospheric HeI lines and the brightness of the star, both on a time scale of months and on a time scale of years. The short-term variations are smaller and do not follow the long-term trend, strongly suggesting different physical mechanisms. Metal lines also show both short-term and long-term variations in strength and also a long-term trend in radial velocity. Most of the line-profile variations can be attributed to changing strengths of lines. Propagating features in the line profiles are rarely observed. We find that the mass-loss rate of HD 160529 is almost independent of temperature, i.e. visual brightness.

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