Article (Scientific journals)
The strange case of the massive binary HD 149404
Rauw, Grégor; Nazé, Yaël; Carrier, F. et al.
2001In Astronomy and Astrophysics, 368, p. 212-224
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Keywords :
STARS: EARLY-TYPE; BINARIES: SPECTROSCOPIC; STARS: INDIVIDUAL: HD 149404
Abstract :
[en] We report the analysis of an extensive set of high-resolution spectroscopic observations of the massive binary system HD 149404. We compare different techniques to measure the radial velocities of the heavily blended absorption lines and we derive a new orbital solution. The absorption lines display strong variability that slightly affects the orbital solution and the determination of the spectral types of the components of the binary. We find that the primary is probably of spectral type O7.5 I(f), while the secondary is most likely an ON9.7 I supergiant. The secondary seems to be the most evolved component of the system and its current evolutionary status could best be explained if the system has undergone a Roche lobe overflow episode during the past. The secondary could actually still be rather close to filling its critical volume and this could lead to an enhanced mass loss of the secondary. The spectrum of HD 149404 displays many emission lines some of which show phase-locked line profile variations. In particular, the Halpha line displays a double-peaked morphology at orbital phases near conjunction. We investigate the radial velocity behaviour of the emission lines and we find that some of them must be formed in an interaction region. We propose a simple model where some of the optical emission lines arise in a heavily bended shock region. Based on observations collected at the European Southern Observatory (La Silla, Chile) and at the Cerro Tololo Inter-American Observatory (CTIO).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Rauw, Grégor  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales
Nazé, Yaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales
Carrier, F.;  Observatoire de Genève, 1290 Sauverny, Switzerland
Burki, G.;  Observatoire de Genève, 1290 Sauverny, Switzerland
Gosset, Eric ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Vreux, Jean-Marie ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO)
Language :
English
Title :
The strange case of the massive binary HD 149404
Publication date :
01 March 2001
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
368
Pages :
212-224
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 02 July 2009

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