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Title:
Long-term spectroscopic monitoring of the Luminous Blue Variable HD 160529
Authors:
Stahl, O.; Gäng, T.; Sterken, C.; Kaufer, A.; Rivinius, T.; Szeifert, T.; Wolf, B.
Affiliation:
AA(Landessternwarte Königstuhl, 69117 Heidelberg, Germany), AB(L-3 Communications, NASA/GSFC, Greenbelt, MD 20771, USA), AC(Astronomy Group, Vrije Universiteit Brussel, Pleinlan 2, 1050 Brussels, Belgium), AD(European Southern Observatory, 85748 Garching, Karl-Schwarzschild-Str. 2, Germany), AE(Landessternwarte Königstuhl, 69117 Heidelberg, Germany; European Southern Observatory, 85748 Garching, Karl-Schwarzschild-Str. 2, Germany), AF(European Southern Observatory, 85748 Garching, Karl-Schwarzschild-Str. 2, Germany), AG(Landessternwarte Königstuhl, 69117 Heidelberg, Germany)
Publication:
Astronomy and Astrophysics, v.400, p.279-291 (2003) (A&A Homepage)
Publication Date:
03/2003
Origin:
A&A
A&A Keywords:
stars: individual: HD 160529, stars: early-type, stars: emission-line, Be, stars: variables: general, stars: mass-loss
DOI:
10.1051/0004-6361:20021908
Bibliographic Code:
2003A&A...400..279S

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 (lambda /Delta lambda ~ 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.

Based on observations collected at the European Southern Observatory at La Silla, Chile (proposals 69.D-0378, 269.D-5038).

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