[en] We discuss the first results of our ongoing optical spectroscopic monitoring campaign of the two O-type stars 9 Sgr and HD 168112. Both objects display a non-thermal radio emission and were considered as single stars. Based on a large set of high-resolution spectra, we find that 9 Sgr is clearly an eccentric SB2 binary with an orbital period of several years. On the other hand, no evidence for radial velocity variations attributable to binary motion is found in our spectra of HD 168112.
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
Sana, H.
Gosset, Eric ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
De Becker, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales
Arias, J.
Morrell, N.
Eenens, P.
Stickland, D.
Language :
English
Title :
On the multiplicity of the non-thermal radio emitters 9 Sgr and HD 168112
Publication date :
November 2005
Event name :
JENAM 2005, "Distant Worlds"
Event organizer :
Université de Liège, IAGL
Event place :
Liège, Belgium
Event date :
du 4 au 7 juillet 2005
Audience :
International
Main work title :
Massive Stars and High-Energy Emission in OB Associations
