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VFTS 352

Artist's rendering of VFTS 352 binary star
Credit: ESO/L. Calçada
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
SIMBAD data
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 atmospheres overlap. [6] Both stars are rotating at a rate equal to their orbital period; that is, they are tidally locked. [7] 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. ^ a b Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode: 2003yCat.2246....0C.
  2. ^ a b 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. S2CID  54501763.
  3. ^ a b 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. S2CID  119302111.
  4. ^ a b c d e f g Almeida, L. A.; Sana, H.; Mink, S. E. de; Tramper, F.; Soszyński, 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. S2CID  53653307.
  5. ^ "Final Kiss of Two Stars Heading for Catastrophe". EPB. 15 October 2015. Retrieved 17 October 2015.
  6. ^ a b c "Final kiss of two stars heading for catastrophe". Astronomy Now. 21 October 2015. Retrieved 2015-10-21.
  7. ^ Abdul-Masih, Michael; Sana, Hugues; Hawcroft, Calum; Almeida, Leonardo A.; Brands, Sarah A.; De Mink, Selma E.; Justham, Stephen; Langer, Norbert; Mahy, Laurent; Marchant, Pablo; Menon, Athira; Puls, Joachim; Sundqvist, Jon (2021). "Constraining the Overcontact Phase in Massive Binary Evolution I. Mixing in V382 Cyg, VFTS 352, and OGLE SMC-SC10 108086". Astronomy & Astrophysics. 651: A96. arXiv: 2104.07621. Bibcode: 2021A&A...651A..96A. doi: 10.1051/0004-6361/202040195. S2CID  233240917.
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