Astronomy:LS 5039

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Short description: Binary star system in the constellation Scutum

Coordinates: Sky map 18h 26m 15.0568s, −14° 50′ 54.242″

LS 5039
250px
A broad-band optical light curve for V479 Scuti, adapted from Sarty et al. (2011)[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Scutum
Right ascension  18h 26m 15.0568s[2]
Declination −14° 50′ 54.242″[2]
Apparent magnitude (V) 11.27[3]
Characteristics
Spectral type O(f)N6.5V + Black hole[4]
Astrometry
Radial velocity (Rv)17.2 ± 0.7[4] km/s
Proper motion (μ) RA: 6.826[2] mas/yr
Dec.: −8.515[2] mas/yr
Distance8200±300[4] ly
(2500±100[4] pc)
Orbit[4]
Period (P)3.90603 ± 0.00017 d
Eccentricity (e)0.31 ± 0.04
Inclination (i)24.9 ± 2.8°
Periastron epoch (T)HJD 2451943.09 ± 0.10
Argument of periastron (ω)
(secondary)		226 ± 8°
Semi-amplitude (K1)
(primary)		19.4 ± 0.9 km/s
Details[4]
O star
Mass22.9+3.4
−2.9 M☉
Radius9.3+0.7
−0.6 R☉
Luminosity182000 L☉
Surface gravity (log g)3.85 cgs
Temperature39000 K
Rotational velocity (v sin i)113 km/s
Black hole
Mass3.7+1.3
−1.0 M☉
RadiusProbably 10.93 km
Other designations
V479 Sct, TYC 5702-1197-1, 2MASS J18261505-1450542[5]
Database references
SIMBADdata

LS 5039 is a binary system in the constellation of Scutum. It has an apparent magnitude of 11.27,[3] and it is about 8,200 light-years away.[4]

The "LS" in the system's name refers to the Luminous Stars catalogue which was published by Charles Bruce Stephenson and Nicholas Sanduleak in 1971.[6][7] In 2001, J. Simon Clark et al. announced that LS 5039 varies in brightness.[8] For that reason, it was given the variable star designation V479 Scuti, in 2006.[9] It is considered to be a possible microquasar.[10]

LS 5039 consists of a massive O-type main-sequence star, and a compact object (likely a black hole)[4] that emits HE (high energy) and VHE (very high energy) gamma rays. It is one of the only three known star systems of this kind, together with LS I +61 303 and PSR B1259-63. The two objects orbit each other every 3.9 days, along a moderately eccentric orbit.[4] Additionally, it is one of the few massive X-ray binaries known to be associated with radio emission.[11]

References

  1. ↑ Sarty, Gordon E.; Szalai, Tamás; Kiss, László; Matthews, Jaymie M.; Wu, Kinwah; Kuschnig, Rainer; Guenther, David B.; Moffat, Anthony F. J. et al. (February 2011). "The γ-ray binary LS 5039: mass and orbit constraints from MOST observations". Monthly Notices of the Royal Astronomical Society 411 (2): 1293–1300. doi:10.1111/j.1365-2966.2010.17757.x. Bibcode: 2011MNRAS.411.1293S. 
  2. ↑ 2.0 2.1 2.2 2.3 Gaia Collaboration (2016). "Gaia Data Release 1". Astronomy & Astrophysics 595: A2. doi:10.1051/0004-6361/201629512. Bibcode: 2016A&A...595A...2G. 
  3. ↑ 3.0 3.1 Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. Bibcode: 2012yCat.1322....0Z. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 Casares, J; Ribo, M; Ribas, I; Paredes, J. M; Marti, J; Herrero, A (2005). "A possible black hole in the γ-ray microquasar LS 5039". Monthly Notices of the Royal Astronomical Society 364 (3): 899–908. doi:10.1111/j.1365-2966.2005.09617.x. Bibcode: 2005MNRAS.364..899C. 
  5. ↑ "V* V479 Sct". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+V479+Sct. 
  6. ↑ Collmar, W.; Zhang, S. (May 2014). "LS 5039 - the counterpart of the unidentified MeV source GRO J1823-12". Astronomy & Astrophysics 565: A39. doi:10.1051/0004-6361/201323193. Bibcode: 2014A&A...565A..38C. https://www.aanda.org/articles/aa/pdf/2014/05/aa23193-13.pdf. Retrieved 13 September 2025. 
  7. ↑ Steph.enson, C. B.; Sanduleak, N. (1971). "Luminous stars in the Southern Milky Way". Publication of the Warner and Swasey Observatory, Cleveland, Ohio: Case Western Reserve University 1: 1. Bibcode: 1971PW&SO...1a...1S. https://ui.adsabs.harvard.edu/abs/1971PW%26SO...1a...1S/abstract. Retrieved 13 September 2025. 
  8. ↑ Clark, J. S.; Reig, P.; Goodwin, S. P.; Larionov, V. M.; Blay, P.; Coe, M. J.; Fabregat, J.; Negueruela, I. et al. (September 2001). "On the radio emitting high mass X-ray binary LS 5039". Astronomy and Astrophysics 376 (2): 476–483. doi:10.1051/0004-6361:20010919. https://www.aanda.org/articles/aa/pdf/2001/35/aa1418.pdf. Retrieved 13 September 2025. 
  9. ↑ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (August 2006). "The 78th Name-List of Variable Stars". Information Bulletin on Variable Stars 5721: 1–45. Bibcode: 2006IBVS.5721....1K. https://ibvs.konkoly.hu/pub/ibvs/5701/5721.pdf. Retrieved 13 September 2025. 
  10. ↑ Yoneda, Hiroki; Bosch-Ramon, Valenti; Enoto, Teruaki; Khangulyan, Dmitry; Ray, Paul S.; Strohmayer, Tod; Tamagawa, Toru; Wadiasingh, Zorawar (May 2023). "Unveiling Properties of the Nonthermal X-Ray Production in the Gamma-Ray Binary LS 5039 Using the Long-term Pattern of Its Fast X-Ray Variability". The Astrophysical Journal 948 (2): 77. doi:10.3847/1538-4357/acc175. Bibcode: 2023ApJ...948...77Y. 
  11. ↑ Trigueros Páez, E.; Barbá, R. H.; Negueruela, I.; Maíz Apellániz, J.; Simón-Díaz, S.; Holgado, G. (2021). "MONOS: Multiplicity of Northern O-type Spectroscopic systems". Astronomy & Astrophysics 655: A4. doi:10.1051/0004-6361/202141018. 

See also

  • LS I +61 303, the only other known VHE gamma ray producing system




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