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Long-term spectroscopic monitoring of the Luminous Blue Variable HD160529 | | Otmar Stahl
; Thomas Gaeng
; Chris Sterken
; Andreas Kaufer
; Thomas Rivinius
; Thomas Szeifert
; Bernhard Wolf
; | | Date: |
20 Dec 2002 | | Journal: | Astron.Astrophys. 400 (2003) 279-292 | | Subject: | astro-ph | | Abstract: | 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. | | Source: | arXiv, astro-ph/0212473 | | Services: | Forum | Review | PDF | Favorites | |
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