A Large H I Shell surrounding the Wolf-Rayet Star HD 191765
作者： Simon Gervais , Nicole St-Louis
DOI: 10.1086/301065
关键词: Local standard of rest 、 Position angle 、 Proper motion 、 Interstellar medium 、 Line-of-sight 、 Supersonic speed 、 Astronomy 、 Sky 、 Wolf–Rayet star 、 Astrophysics 、 Physics
摘要: Our H I maps reveal the existence of a nearly complete shell at velocity vsys = -11.44 km s-1 (Rs ≈ 20.9 pc, vexp 9.9 s-1, MH 1830 M⊙), which, mainly for morphological reasons, we associate with HD 191765 (although contribution from nearby W-R star 192103 cannot be totally excluded). The dynamical age this bubble (~1.3 × 106 yr) suggests that it was blown during main-sequence progenitor O-star phase. kinematic distance corresponding to local standard rest -11 is approximately 5 kpc, which incompatible association 2.1 kpc. Therefore, conclude have detected in gas already movement respect normal Galactic rotation region. There independent evidence present line sight. Recent Hipparcos data analyzed by Moffat et al. give supersonic proper motion (projected ~52 position angle on sky P.A. -38°). This vector points away very close center bubble, strengthens hypothesis physical link star. interstellar medium might generated some compression southwest region, rendering Hα brighter direction surroundings.
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sci-hub.se 参考文章(30)
Guillermo Garcia-Segura, Mordecai-Mark Mac Low, Wolf-Rayet Bubbles. I. Analytic Solutions The Astrophysical Journal. ,vol. 455, pp. 145- ,(1995) , 10.1086/176563
Y.-H. Chu, R. R. Treffers, K. B. Kwitter, Galactic ring nebulae associated with Wolf-Rayet stars. VIII: Summary and atlas Astrophysical Journal Supplement Series. ,vol. 53, pp. 937- 944 ,(1983) , 10.1086/190914
Michel Fich, Leo Blitz, Antony A. Stark, The rotation curve of the Milky Way to 2 R(0) The Astrophysical Journal. ,vol. 342, pp. 272- 284 ,(1989) , 10.1086/167591
C. Cappa de Nicolau, V. S. Niemela, The interstellar bubble around Theta MUSCAE The Astronomical Journal. ,vol. 89, pp. 1398- 1403 ,(1984) , 10.1086/113641
P. E. Dewdney, T. A. Lozinskaya, Large scale 21 CM H I observations of the CYG OB1/OB3 supershell The Astronomical Journal. ,vol. 108, pp. 2212- 2219 ,(1994) , 10.1086/117233
Dave van Buren, Mordecai-Mark Mac Low, Douglas O. S. Wood, Ed Churchwell, Cometary compact H II regions are stellar-wind bow shocks The Astrophysical Journal. ,vol. 353, pp. 570- 578 ,(1990) , 10.1086/168645
R. R. Treffers, Y.-H. Chu, Galactic ring nebulae associated with Wolf-rayet stars. V. The stellar wind blown bubbles. The Astrophysical Journal. ,vol. 254, pp. 569- 577 ,(1982) , 10.1086/159767
C. E. Cappa de Nicolau, V. S. Niemela, G. M. Dubner, E. M. Arnal, The H I bubble around the Wolf-Rayet star HD 156385 and its environs The Astronomical Journal. ,vol. 96, pp. 1671- ,(1988) , 10.1086/114918
Y.-H. Chu, Galactic ring nebulae associated with Wolf-rayet stars. I. Introduction and classification. The Astrophysical Journal. ,vol. 249, pp. 195- ,(1981) , 10.1086/159275
Cristina E. Cappa, Gloria M. Dubner, Chris Rogers, Nicole St-Louis, The Interaction of NGC 6888 and HD 192163 With the Surrounding Interstellar Medium The Astronomical Journal. ,vol. 112, pp. 1104- ,(1996) , 10.1086/118082