On the ring nebulae around runaway Wolf-Rayet stars

被引:12
作者
Meyer, D. M-A [1 ]
Oskinova, L. M. [1 ,2 ]
Pohl, M. [1 ,3 ]
Petrov, M. [4 ]
机构
[1] Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany
[2] Kazan Fed Univ, Dept Astron, Kremlevskaya Str 18, Kazan, Russia
[3] DESY, Platanenallee 6, D-15738 Zeuthen, Germany
[4] Max Planck Comp & Data Facil MPCDF, Giessenbachstr 2, D-85748 Garching, Germany
关键词
MHD-radiative transfer; methods: numerical; stars: circumstellar matter; MASSIVE STARS; BOW SHOCKS; WN STARS; EVOLUTION; CONSTRAINTS; MODELS; DUST;
D O I
10.1093/mnras/staa1700
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Wolf-Rayet stars are advanced evolutionary stages of massive stars. Despite their large mass-loss rates and high wind velocities, none of them displays a bow shock, although a fraction of them are classified as runaway. Our 2.5-D numerical simulations of circumstellar matter around a 60-M-circle dot runaway star show that the fast Wolf-Rayet stellar wind is released into a wind-blown cavity filled with various shocks and discontinuities generated throughout the preceding evolutionary phases. The resulting fast-wind-slow-wind interaction leads to the formation of spherical shells of swept-up dusty material similar to those observed in the near-infrared at 24 mu m with Spitzer, which appear to be comoving with the runaway massive stars, regardless of their proper motion and/or the properties of the local ambient medium. We interpret bright infrared rings around runaway Wolf-Rayet stars in the Galactic plane as an indication of their very high initial masses and complex evolutionary history. Stellar-wind bow shocks become faint as stars run in diluted media, therefore our results explain the absence of bow shocks detected around Galactic Wolf-Rayet stars, such as the high-latitude, very fast-moving objects WR71, WR124 and WR148. Our results show that the absence of a bow shock is consistent with the runaway nature of some Wolf-Rayet stars. This questions the in situ star formation scenario of high-latitude Wolf-Rayet stars in favour of dynamical ejection from birth sites in the Galactic plane.
引用
收藏
页码:3906 / 3911
页数:6
相关论文
共 45 条
  • [1] The Chemical Composition of the Sun
    Asplund, Martin
    Grevesse, Nicolas
    Sauval, A. Jacques
    Scott, Pat
    [J]. ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, VOL 47, 2009, 47 : 481 - 522
  • [2] Two extremely luminous WN stars in the Galactic center with circumstellar emission from dust and gas
    Barniske, A.
    Oskinova, L. M.
    Hamann, W. -R.
    [J]. ASTRONOMY & ASTROPHYSICS, 2008, 486 (03): : 971 - 984
  • [3] Bestenlehner J. M., 2014, AA, V570, P38, DOI [10.1051/0004-6361/201423643, DOI 10.1051/0004-6361/201423643]
  • [4] Bohannan B, 1997, ASTR SOC P, V120, P3
  • [5] EVOLUTION OF WR RING NEBULAE GENERATED BY MOVING CENTRAL STARS .1. THE PARADIGM OF G2.4+1.4
    BRIGHENTI, F
    DERCOLE, A
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1995, 273 (02) : 443 - 448
  • [6] BRIGHENTI F, 1995, MON NOT R ASTRON SOC, V277, P53
  • [7] Multiple ring nebulae around blue supergiants
    Chita, S. M.
    Langer, N.
    van Marle, A. J.
    Garcia-Segura, G.
    Heger, A.
    [J]. ASTRONOMY & ASTROPHYSICS, 2008, 488 (02) : L37 - U9
  • [8] Physical properties of Wolf-Rayet stars
    Crowther, Paul A.
    [J]. ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, 2007, 45 : 177 - 219
  • [9] Discovery of an OB runaway star inside SNR S147
    Dincel, B.
    Neuhaeuser, R.
    Yerli, S. K.
    Ankay, A.
    Tetzlaff, N.
    Torres, G.
    Mugrauer, M.
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2015, 448 (04) : 3196 - 3205
  • [10] Dullemond C. P., 2012, ASCL1108016