Article (Scientific journals)
What is the real nature of HD 108?
Nazé, Yaël; Vreux, Jean-Marie; Rauw, Grégor
2001In Astronomy and Astrophysics, 372, p. 195-207
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Keywords :
STARS: EARLY-TYPE; STARS: MASS-LOSS; STARS: INDIVIDUAL: HD 108
Abstract :
[en] Since the beginning of the past century, the nature of HD 108 has been a subject of intense debate. One after another, astronomers explored its variability and attributed it either to binarity, or to changes in the stellar wind of a single star. In this article, we analyse a 30 year campaign of spectroscopic observations of this star with special emphasis on the last 15 years during which photographic plates have been replaced by CCD detectors. Our investigation of the radial velocities of HD 108 yields no significant short- or long-term period and does not confirm the published periodicities either. Though the radial velocity of HD 108 appears clearly variable, the variations cannot be explained by the orbital motion in a spectroscopic binary. However, our data reveal spectacular changes in the H I Balmer lines and some He I profiles over the years. These lines continuously evolved from P Cygni profiles to ``pure'' absorption lines. A similar behaviour has already been observed in the past, suggesting that these changes are recurrent. HD 108 seems to share several characteristics of Oe stars and we discuss different hypotheses for the origin of the observed long-term variations. As we are now in a transition period, a continuous monitoring of HD 108 should be considered for the next few years. Based on observations collected at the Observatoire de Haute-Provence (France).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Nazé, Yaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales
Vreux, Jean-Marie ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO)
Rauw, Grégor  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales
Language :
English
Title :
What is the real nature of HD 108?
Publication date :
01 June 2001
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
372
Pages :
195-207
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 02 July 2009

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