Reference : HD 152248: Evidence for a colliding wind interaction
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/15963
HD 152248: Evidence for a colliding wind interaction
English
Sana, H. [Institut d'Astrophysique et de Géophysique, Université de Liège, 5 avenue de Cointe, 4000 Liège, Belgium]
Rauw, Grégor mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales >]
Gosset, Eric mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
1-Apr-2001
Astronomy and Astrophysics
EDP Sciences
370
121-135
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] BINARIES: CLOSE ; BINARIES: SPECTROSCOPIC ; STARS: EARLY-TYPE ; STARS: FUNDAMENTAL PARAMETERS ; STARS: INDIVIDUAL: HD 152248\ ; STARS: WINDS ; OUTFLOWS
[en] We present the results of a four year spectroscopic campaign on the early-type binary system HD 152248. Our analysis yields a new classification as O7.5III(f) + O7III(f), in contradiction with previous classifications of the components as supergiants. We derive improved orbital elements and the corresponding masses (M_1=29.6 M[SUB]sun[/SUB] and M_2=29.9 M[SUB]sun[/SUB]) are somewhat larger than previously reported in the literature, although they are still significantly lower than the ones expected from evolutionary tracks. Both components of the system are close to filling their Roche lobe at periastron passage. We also investigate the equivalent width variations of the lines of the two components and we discuss their relation to the Struve-Sahade effect. Finally, we show that the line profile variability of the He Iil4686 and Halpha lines is consistent with a strong wind interaction between the two stars, quite as predicted by current colliding wind models. Based on data collected at the European Southern Observatory (La Silla, Chile) and at the Cerro Tololo Inter-American Observatory (Cerro Tololo, Chile).
http://hdl.handle.net/2268/15963
10.1051/0004-6361:20010221
http://adsabs.harvard.edu/abs/2001A%26A...370..121S

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