Počet záznamů: 1

Neutral material around the B[e] supergiant star LHA115-S 65 An outflowing disk or a detached Keplerian rotating disk?

  1. 1.
    0354843 - ASU-R 2011 RIV FR eng J - Článek v odborném periodiku
    Kraus, Michaela - Borges Fernandes, M. - de Araújo, F. X.
    Neutral material around the B[e] supergiant star LHA115-S 65 An outflowing disk or a detached Keplerian rotating disk?.
    Astronomy & Astrophysics. July, č. 517 (2010), A30/1-A30/13 ISSN 0004-6361
    Grant CEP: GA AV ČR KJB300030701
    Výzkumný záměr: CEZ:AV0Z10030501
    Klíčová slova: supergiants * circumstellar matter * outflows
    Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
    Impakt faktor: 4.410, rok: 2010

    The B[e] supergiant LHA 115-S 65 (in short: S 65) in the Small Magellanic Cloud is one of the two most rapidly rotating B[e] stars known. Its almost edge-on orientation allows a detailed kinematical study of its optically thin forbidden emission lines. With a focus on the rather strong [Oi] lines, we intend to test the two plausible disk scenarios: the outflowing and the Keplerian rotating disk. Both disk scenarios deliver reasonably good fits to the line luminosities and profiles of the [Oi] lines. Nevertheless, the Keplerian disk model seems to be the more realistic one, because it also agrees with the kinematics derived from the large number of additional lines in the spectrum. As additional support for the presence of a high-density, gaseous disk, the spectrum shows two very intense and clearly double-peaked [Caii] lines. We discuss a possible disk-formation mechanism, and similarities between S 65 and the group of Luminous Blue Variables.
    Trvalý link: http://hdl.handle.net/11104/0193756