binaries : spectroscopic; stars : early-type; stars : fundamental parameters; stars : individual : HD 93161 (A,B); X-rays : individual : HD 93161; X-rays : stars
Abstract :
[en] We present the analysis of an extensive set of high-resolution spectroscopic observations of HD 93161, a visual binary with a separation of 2 arcsec. HD 93161 A is a spectroscopic binary, with both components clearly detected throughout the orbit. The primary star is most probably of spectral type O8V, while the secondary is likely an O9V. We obtain the first orbital solution for this system, characterized by a period of 8.566 +/- 0.004 d. The minimum masses of the primary and secondary stars are 22.2 +/- 0.6 and 17.0 +/- 0.4 M-., respectively. These values are quite large, suggesting a high inclination of the orbit. The second object, HD 93161 B, displays an O6.5V(f) spectral type and is thus slightly hotter than its neighbour. This star is at first sight single but presents radial velocity variations. Finally, we study HD 93161 in the X-ray domain. No significant variability is detected. The X-ray spectrum is well described by a 2T model with kT(1) similar to 0.3 keV and kT(2) similar to 0.7 keV. The X-ray luminosity is rather moderate, without any large emission excess imputable to a wind interaction.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Nazé, Yaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Antokhin, I. I.
Sana, H.
Gosset, Eric ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Rauw, Grégor ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Language :
English
Title :
Optical spectroscopy of X-Mega targets - V. The spectroscopic binary HD 93161 A and its visual companion HD 93161 B
Corcoran M. F., Pittard J. M., Marchenko S. V., in van der Hucht K. A., Koenigsberger G., Eenens P. R. J., eds, Proc. IAU Symp. 193, Wolf-Rayet Phenomena in Massive Stars and Starburst Galaxies. Astron. Soc. Pac., San Francisco, p. 772
Diplas A., Savage B. D., 1994, ApJS, 93, 211
Feinstein A., Marraco H. G., Muzzio J. C., 1973, A&AS, 12, 331
Forte J. C., 1978, AJ, 83, 1199
Freyhammer L. M., Clausen J. V., Arentoft J., Sterken C., 2001, A&A, 369, 561
Gies D. R., 2003, in van der Hucht K. A., Herrero A., Esteban C., eds, Proc. IAU Symp. 212, A Massive Star Odyssey: From Main Sequence to Supernova. Astron. Soc. Pac., San Francisco, p. 91
Luna G. J., Levato H., Malaroda S., Grosso M., 2003, Inf. Bull. Var. Stars, 5375, 1
Martins F., Schaerer D., Millier D. J., 2002, A&A, 382, 999
Mason B.D., Gies D. R., Hartkopf W. I., Bagnuolo W. G., Jr, ten Brummelaar T., McAlister H. A., 1998, AJ, 115, 821
Massey P., Johnson J., 1993, AJ, 105, 980
Mathys G., 1988, A&AS, 76, 427
Mathys G., 1989, A&AS, 81, 237
Mermilliod J.-C., 1988, Bulletin d'Information du Centre de Données Stellaires (CDS), 35, 77
Mermilliod J.-C., 1992, Bulletin d'Information du Centre de Données Stellaires (CDS), 40, 115
Mewe R., Gronenschild E. H. B. M., van den Oord G. H. J., 1985, A&AS, 62, 197
Morrell N. I. et al., 2001, MNRAS, 326, 85 (Paper II)
Penny L. R., 1996, ApJ, 463, 737
Pittard J. M., Stevens I. R., 2002, A&A, 388, L20
Raassen A. J. J., van der Hucht K. A., Mewe R., Antokhin I. I., Rauw G., Vreux J.-M., Schmutz W., Güdel M., 2003, A&A, 402, 653
Rauw G., Sana H., Antokhin I. I., Morrell N. I., Niemela V. S., Albacete Colombo J. F., Gosset E., Vreux J.-M., 2001, MNRAS, 326, 1149 (Paper III)
Sana H., Rauw G., Gosset E., 2001, A&A, 370, 121
Sana H., Hensberge H., Rauw G., Gosset E., 2003, A&A, 405, 1063
Sana H., Stevens I. R., Gosset E., Rauw G., Vreux J.-M., 2004, MNRAS, 350, 809
Sana H., Nazé Y., Gosset E., Rauw G., Sung H., Vreux J.-M., 2005a, in Moffat A. F. J., St Louis N., eds, ASP Conf. Ser., Massive Stars in Interacting Binaries. Astron, Soc. Pac., San Francisco, in press
Sana H., Antokhina E., Royer P., Manfroid J., Gosset E., Rauw G., Vreux J.-M. 2005b, A&A, in press
Schaller G., Schaerer D., Meynet G., Maeder A., 1992, A&AS, 96, 269
Tapia M., Roth M., Vázquez R. A., Feinstein A., 2003, MNRAS, 339, 44
Thaller M. L., 1997, ApJ, 487, 380
Turatto M., Tighe R., Castillo R., 1997, ESO Technical Report, no. E15-TRE-ESO-22201-00001
Turner M. J. L. et al., 2001, A&A, 365, L27
Vázquez R. A., Baume G., Feinstein A., Prado P., 1996, A&AS, 116, 75
Vink J. S., de Koter A., Lamers H. J. G. L. M., 2000, A&A, 362, 295
Vink J. S., de Koter A., Lamers H. J. G. L. M., 2001, A&A, 369, 574
Vreux J.-M., Andrillat Y., 1974, A&A, 34, 313
Walborn N. R., 1973, ApJ, 179, 517
Walborn N. R., 1995, in Niemala V., Morrell N., Feinstein A., eds, Rev. Mex. Astron. Astrofis. Ser. Conf. Vol. 2, The Eta Carinae Region: Laboratory of Stellar Evolution. UNAM, Mexico, p. 51
Walborn N. R., Fitzpatrick E. L., 1990, PASP, 102, 379
Wolfe R. H., Jr, Horak H. G., Storer N. W., 1967, in Hack M., ed., Modern Astrophysics. Gordon & Breach, New York, p. 251