Abstract
We aim to study the effect of the fast rotation, stellar wind and circumstellar disks around active hot stars and their effects on the formation and evolution of these massive stars. For that purpose, we obtained, for the first time, interferometric measurements of three active hot stars, namely α Arae, κ CMa and Achernar, using the VLTI /AMBER and VLTI/MIDI instruments which allow us to study the kinematics of the central star and its surrounding circumstellar matter. These data coupled with our numerical code SIMECA (SIMulation pour Etoiles Chaudes Actives) seem to indicate that the presence of equatorial disks and polar stellar wind around Be stars are not correlated. A polar stellar wind was detected for α Arae and Achernar whereas κ CMa seems to exhibit no stellar wind. On the other hand, these two first Be stars are certainly nearly critical rotators whereas the last one seems to be far from the critical rotation. Thus a polar stellar wind may be due to the nearly critical rotation which induces a local effective temperature change following the von Zeipel theorem, producing a hotter polar region triggering a polar stellar wind. This critical rotation may also explain the formation of a circumstellar disk which is formed by the centrifugal force balancing the equatorial effective gravity of the central star. Following these results we try to investigate if critical rotation may be the clue for the Be phenomenon.
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Martayan, C., Hubert, A.-M., Floquet, M., et al.: A&A 445, 931 (2006a)
Martayan, C., Frémat, Y., Hubert, A.-M., et al.: A&A 452, 273 (2006b)
Meilland, A., Stee, Ph., Vannier, M., et al.: A&A 464, 59 (2007)
Kervella, P., Domiciano de Souza, A.: A&A 453, 1059 (2006)
Perryman, M.A.C., Lindegren, L., Kovalevsky, J., et al.: A&A 323, 49 (1997)
Chesneau, O., Meilland, A., Rivinius, T., et al.: A&A 435, 275 (paper I) (2005)
Stee, Ph.: A&A 403, 1023 (2003)
Townsend, R.H., Owocki, S.P., Howarth, I.D.: MNRAS 350, 189 (2004)
Owocki, S.P.: ASPC 337, 101 (2005)
Domiciano de Souza, A., Kervella, P., Jankov, S., et al.: A&A 407, L47 (2003)
Struve, O.: ApJ 73, 94 (1931)
Cranmer, S.R., Owocki, S.P.: ApJ 440, 308 (1995)
Owocki, S.P., Gayley, K.G.: ASPC 131, 237 (1998)
Porter, J.M., Rivinius, Th.: PASP 115, 1153 (2003)
Dachs, J., Poetzel, R., Kaiser, D. A&AS 78, 487 (1989)
Mennickent, R.E., Vogt, N., Barrera, L.H.: A&AS 106, 427 (1994)
Okazaki, A.: A&A 318, 548 (1997)
Prinja, R.K.: MNRAS 241, 721 (1989)
Zorec, J., Frémat, Y., Cidale, L.: A&A 441, 235 (2005)
Vakili, F., Mourard, D., Stee, Ph., et al.: A&A 335, 261 (1998)
Berio, Ph., Stee, Ph., Vakili, F., et al.: A&A 345, 203 (1999)
Meilland, A., Millour, F., Stee, Ph., et al.: A&A 464, 73 (2007)
Slettebak, A.: ApJ 50, 55 (1982)
Balona, L.A., Engelbrecht, C.A., Marang, F.: MNRAS 227, 123 (1987)
Chauville, J., Zorec, J., Ballereau, D., et al.: A&A 378, 861 (2001)
Vinicius, M.M.F., Zorec, J., Leister, N.V., et al.: A&A 446, 643 (2006)
von Zeipel, H.: MNRAS 84, 665 (1924)
Kervella, P., Domiciano de Souza, A.: A&A 474, L49 (2007)
Kanaan, S., Meilland, A., Stee, Ph., et al.: A&A 486, 785 (2008)
Meilland, A.: Evolution, gèomètrie et cinèmatique des enveloppes circumstellaires des ètoiles chaudes: Apport des instruments AMBER et MIDI, Thesis, 2007, Université Nice Sophia Antipolis-UFR Science
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Stee, P., Meilland, A. (2009). Is the Critical Rotation of Be Stars Really Critical for the Be Phenomenon?. In: Rozelot, JP., Neiner, C. (eds) The Rotation of Sun and Stars. Lecture Notes in Physics, vol 765. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-87831-5_8
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DOI: https://doi.org/10.1007/978-3-540-87831-5_8
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