W75N(B)-VLA2
W75N(B)-VLA2
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
Constellation | Cygnus |
Right ascension | 20h 38m 36.482s[1] |
Declination | +42° 37′ 34.09″[1] |
| Characteristics | |
Spectral type | Be |
| Details | |
| Mass | ~9[2] M☉ |
| Luminosity | 300 L☉ |
| Database references | |
| SIMBAD | data |
| Star formation |
|---|
 |
Object classes |
Interstellar medium Molecular cloud Bok globule Dark nebula Young stellar object Protostar T Tauri star Pre-main-sequence star Herbig Ae/Be star Herbig–Haro object |
Theoretical concepts |
Accretion Initial mass function Jeans instability Kelvin–Helmholtz mechanism Nebular hypothesis Planetary migration |
 Star portal |
W75N(B)-VLA2 is a massive protostar some 4,200 light-years from Earth, about 8 times more massive[2] and 300 times brighter than our Sun, observed in 1996 and 2014 by the Karl G. Jansky Very Large Array (VLA). In 2014 its stellar wind had changed from a compact spherical form to a larger thermal, ionized elliptical one outlining collimated motion, giving critical insight into the very early stages of the formation of a massive star.[1][3] Being able to observe its rapid growth as it happens (in real time in an astronomical context) is unique, according to Huib van Langevelde of Leiden University, one of the authors of a study of the object.
The authors of the study believe W75N(B)-VLA2 is forming in a dense, gaseous environment, surrounded by a dusty torus. The star intermittently ejects a hot, ionized wind for several years. Initially the wind can expand in all directions and forms a spherical shell; later it hits the dusty torus, which slows it. There is less resistance along the poles of the torus, so the wind moves more quickly there, giving rise to an elongated shape.[2]
References[edit]
^ abc Carrasco-Gonzalez, C.; Torrelles, J. M.; Canto, J.; Curiel, S.; Surcis, G.; Vlemmings, W. H. T.; Van Langevelde, H. J.; Goddi, C.; Anglada, G.; Kim, S. - W.; Kim, J. - S.; Gomez, J. F. (2015). "Observing the onset of outflow collimation in a massive protostar". Science. 348 (6230): 114–7. arXiv:1507.05285. Bibcode:2015Sci...348..114C. doi:10.1126/science.aaa7216. PMID 25838383..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
^ abc phys.org: VLA images 18 years apart show dramatic difference in young stellar system, 2 April 2015
^ BBC News: Star's birth glimpsed 'in real time', 3 April 2015
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Categories:
- Cygnus (constellation)
- Protostars
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