VFTS 352

VFTS 352
Observation data
Epoch J2000      Equinox J2000
Constellation Dorado
Right ascension 05h 38m 28.456s[1]
Declination −69° 11′ 19.18″[1]
Apparent magnitude (V) 14.38[2]
Characteristics
Evolutionary stage Main Sequence[3]
Spectral type O4.5 V(n)((fc)):z: + O5.5 V(n)((fc)):z:

[3]

B−V color index −0.10[2]
Astrometry
Radial velocity (Rv)262.8[4] km/s
Distance164,000 ly
(50,000[4] pc)
Orbit[4]
PrimaryVFTS 3521
CompanionVFTS 3522
Period (P)1.124 days
Semi-major axis (a)17.55 R☉
Eccentricity (e)0
Inclination (i)55.60°
Longitude of the node (Ω)3.584°
Semi-amplitude (K1)
(primary)		324.9 km/s
Semi-amplitude (K2)
(secondary)		315.6 km/s
Details[4]
VFTS 3521
Mass28.63 ± 0.30 M☉
Radius7.22 ± 0.02 R☉
Luminosity180,000 L☉
Surface gravity (log g)4.18 ± 0.01 cgs
Temperature42,540 ± 280 K
Age1 Myr
VFTS 3522
Mass28.85 ± 0.30 M☉
Radius7.25 ± 0.02 R☉
Luminosity150,000 L☉
Surface gravity (log g)4.18 ± 0.01 cgs
Temperature41,120 ± 290 K
Age1 Myr
Other designations
VFTS 352, 2MASS J05382845-6911191, IRSF J05382846-6911192
Database references
SIMBADdata
Artist's rendering of VFTS 352 binary star. They could be heading for either the formation of a single giant star or as a future binary black hole.[5]
This view shows part of the very active star-forming region around the Tarantula Nebula in the Large Magellanic Cloud, where VFTS 352 is located

VFTS 352 is a contact binary star system 160,000 light-years (49,000 pc) away in the Tarantula Nebula, which is part of the Large Magellanic Cloud.[5] It is the most massive and earliest spectral type overcontact system known.[4]

The discovery of this O-type binary star system made use of the European Southern Observatory's Very Large Telescope,[6] and the description was published on 13 October 2015.[4] VFTS 352 is composed of two very hot (40,000 °C), bright and massive stars of equal size that orbit each other in little more than a day. The stars are so close that their surfaces overlap.[6] Extreme stars like the two components of VFTS 352, are thought to be the main producers of elements such as oxygen.[6]

The future of VFTS 352 is uncertain, and there are two possible scenarios. If the two stars merge, a very rapidly rotating star will be produced. If it keeps spinning rapidly it might end its life in a long-duration gamma-ray burst. In a second hypothetical scenario, the components would end their lives in supernova explosions, forming a close binary black hole system, hence a potential gravitational wave source through black hole–black hole merger.[4]

See also

References

  1. 1 2 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 Evans, C. J.; Taylor, W. D.; Hénault-Brunet, V.; Sana, H.; De Koter, A.; et al. (June 2011). "The VLT-FLAMES Tarantula Survey. I. Introduction and observational overview". Astronomy & Astrophysics 530: A108. arXiv:1103.5386. Bibcode:2011A&A...530A.108E. doi:10.1051/0004-6361/201116782.
  3. 1 2 Walborn, N. R.; Sana, H.; Simón-Díaz, S.; Maíz Apellániz, J.; Taylor, W. D.; Evans, C. J.; Markova, N.; Lennon, D. J.; De Koter, A. (2014). "The VLT-FLAMES Tarantula Survey. XIV. The O-type stellar content of 30 Doradus". Astronomy & Astrophysics 564: A40. arXiv:1402.6969. Bibcode:2014A&A...564A..40W. doi:10.1051/0004-6361/201323082.
  4. 1 2 3 4 5 6 7 Almeida, L. A.; Sana, H.; Mink, S. E. de; Tramper, F.; Soszyn´Ski, I.; Langer, N.; Barbá, R. H.; Cantiello, M.; Damineli, A.; Koter, A. de; Garcia, M.; Gräfener, G.; Herrero, A.; Howarth, I.; Apellániz, J. Maíz; Norman, C.; Ramírez-Agudelo, O. H.; Vink, J. S. (2015). "Discovery of the Massive Overcontact Binary Vfts 352: Evidence for Enhanced Internal Mixing". The Astrophysical Journal 812 (2): 102. arXiv:1509.08940. Bibcode:2015ApJ...812..102A. doi:10.1088/0004-637X/812/2/102.
  5. 1 2 "Final Kiss of Two Stars Heading for Catastrophe". EPB. 15 October 2015. Retrieved 17 October 2015.
  6. 1 2 3 "Final kiss of two stars heading for catastrophe". Astronomy Now. 21 October 2015. Retrieved 2015-10-21.

External links


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