VFTS 102

VFTS 102

Artistic depiction of VFTS 102
Observation data
Epoch J2000      Equinox J2000
Constellation Dorado
Right ascension 05h 37m 39.248s[1]
Declination −69° 09′ 51.04″[1]
Apparent magnitude (V) 15.806[2]
Characteristics
Evolutionary stage Main Sequence
Spectral type O9:Vnnne[3]
U−B color index −0.879[2]
B−V color index +0.293[2]
Astrometry
Radial velocity (Rv)228[3] km/s
Proper motion (μ) RA: 7.3[1] mas/yr
Dec.: 2.1[1] mas/yr
Distance164,000 ly
(50,000 pc)
Details[3]
Mass~ 25 M☉
Luminosity100,000 L☉
Surface gravity (log g)3.6 ± 0.5 cgs
Temperature36,000 ± 5000 K
Rotational velocity (v sin i)600±100 km/s
Other designations
2MASS J05373924-6909510
Database references
SIMBADdata
The position of VFTS 102 in Tarantula nebula.

VFTS 102 is a star located in the Tarantula nebula, a star forming region in the Large Magellanic Cloud, a satellite galaxy of the Milky Way.

The peculiarity of this star is its projected equatorial velocity of ~600 km/s (about 2.000.000 km/h), making it the fastest rotating massive star known.[4] The resulting centrifugal force tend to flatten the star; material can be lost in the loosely bound equatorial regions, allowing for the formation of a disk. The spectroscopic observations seem to confirm this, and the star is classified as Oe, possibly due to emission from such an equatorial disk of gas.

This star was observed by the VLT Flames Tarantula Survey collaboration using the VLT, Very Large Telescope in Chile. One member of this team is Matteo Cantiello, an Italian astrophysicist who emigrated to the United States and is currently working at the Kavli Institute for Theoretical Physics at University of California Santa Barbara. In 2007, together with a few collaborators, he predicted the existence of massive stars with properties very similar to VFTS 102. In its theoretical model, the extreme rotational speed is caused by the transfer of material from a companion star in a binary system. After this "cosmic dance", the donor star is predicted to explode as a supernova. The spun-up companion instead is likely to be launched out of the orbit and move away from its stellar neighbors at high speed. Such a star is called a runaway. VFTS 102 fits this theoretical model very well, being found to be a rapidly rotating runaway star and lying close to a pulsar and a supernova remnant. Other scenarios, like a dynamical ejection from the core of the star cluster R136, are also possible.[5]

References

  1. 1 2 3 4 Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T.; Fowler, J.; Gizis, J.; Howard, E.; Huchra, J.; Jarrett, T.; Kopan, E. L.; Kirkpatrick, J. D.; Light, R. M.; Marsh, K. A.; McCallon, H.; Schneider, S.; Stiening, R.; Sykes, M.; Weinberg, M.; Wheaton, W. A.; Wheelock, S.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". VizieR On-line Data Catalog: II/246. Originally published in: 2003yCat.2246....0C 2246. Bibcode:2003yCat.2246....0C.
  2. 1 2 3 Bonanos, A. Z.; Massa, D. L.; Sewilo, M.; Lennon, D. J.; Panagia, N.; Smith, L. J.; Meixner, M.; Babler, B. L.; Bracker, S.; Meade, M. R.; Gordon, K. D.; Hora, J. L.; Indebetouw, R.; Whitney, B. A. (2009). "Spitzer SAGE Infrared Photometry of Massive Stars in the Large Magellanic Cloud". The Astronomical Journal 138 (4): 1003. arXiv:0905.1328. Bibcode:2009AJ....138.1003B. doi:10.1088/0004-6256/138/4/1003.
  3. 1 2 3 Dufton, P. L.; Dunstall, P. R.; Evans, C. J.; Brott, I.; Cantiello, M.; De Koter, A.; De Mink, S. E.; Fraser, M.; Hénault-Brunet, V.; Howarth, I. D.; Langer, N.; Lennon, D. J.; Markova, N.; Sana, H.; Taylor, W. D. (2011). "The VLT-FLAMES Tarantula Survey: The Fastest Rotating O-type Star and Shortest Period LMC Pulsar—Remnants of a Supernova Disrupted Binary?". The Astrophysical Journal Letters 743: L22. arXiv:1111.0157. Bibcode:2011ApJ...743L..22D. doi:10.1088/2041-8205/743/1/L22.
  4. ↑ Jiang, Dengkai; Han, Zhanwen; Yang, Liheng; Li, Lifang (2013). "The binary merger channel for the progenitor of the fastest rotating O-type star VFTS 102". Monthly Notices of the Royal Astronomical Society 428 (2): 1218. arXiv:1302.6296. Bibcode:2013MNRAS.428.1218J. doi:10.1093/mnras/sts105.
  5. ↑ Cantiello, M.; Yoon, S.-C.; Langer, N.; Livio, M. (2007). "Binary star progenitors of long gamma-ray bursts". Astronomy and Astrophysics 465 (2): L29. arXiv:astro-ph/0702540. Bibcode:2007A&A...465L..29C. doi:10.1051/0004-6361:20077115.

External links

This article is issued from Wikipedia - version of the Thursday, April 28, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.