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LS 5039
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 |
| Distance | 8200±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 | |
| Mass | 22.9+3.4 −2.9 M☉ |
| Radius | 9.3+0.7 −0.6 R☉ |
| Luminosity | 182000 L☉ |
| Surface gravity (log g) | 3.85 cgs |
| Temperature | 39000 K |
| Rotational velocity (v sin i) | 113 km/s |
| Black hole | |
| Mass | 3.7+1.3 −1.0 M☉ |
| Radius | Probably 10.93 km |
| Other designations | |
| V479 Sct, TYC 5702-1197-1, 2MASS J18261505-1450542[5] | |
| Database references | |
| SIMBAD | data |
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
[edit]- ^ Sarty, Gordon E.; Szalai, Tamás; Kiss, László; Matthews, Jaymie M.; Wu, Kinwah; Kuschnig, Rainer; Guenther, David B.; Moffat, Anthony F. J.; Rucinski, Slavek M.; Sasselov, Dimitar; Weiss, Werner W.; Huziak, Richard; Johnston, Helen M.; Phillips, Andre; Ashley, Michael C. B. (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. arXiv:1009.5150. Bibcode:2011MNRAS.411.1293S. doi:10.1111/j.1365-2966.2010.17757.x. S2CID 13234345.
- ^ a b c d Gaia Collaboration (2016). "Gaia Data Release 1". Astronomy & Astrophysics. 595: A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. S2CID 1828208.
- ^ a b Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. Bibcode:2012yCat.1322....0Z.
- ^ a b c d e f g h i 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. arXiv:astro-ph/0507549. Bibcode:2005MNRAS.364..899C. doi:10.1111/j.1365-2966.2005.09617.x. S2CID 8393701.
- ^ "V* V479 Sct". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2 May 2018.
- ^ Collmar, W.; Zhang, S. (May 2014). "LS 5039 - the counterpart of the unidentified MeV source GRO J1823-12" (PDF). Astronomy & Astrophysics. 565: A39. arXiv:1402.2525. Bibcode:2014A&A...565A..38C. doi:10.1051/0004-6361/201323193. Retrieved 13 September 2025.
- ^ 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. Retrieved 13 September 2025.
- ^ Clark, J. S.; Reig, P.; Goodwin, S. P.; Larionov, V. M.; Blay, P.; Coe, M. J.; Fabregat, J.; Negueruela, I.; Papadakis, I.; Steele, I. A. (September 2001). "On the radio emitting high mass X-ray binary LS 5039" (PDF). Astronomy and Astrophysics. 376 (2): 476–483. doi:10.1051/0004-6361:20010919. Retrieved 13 September 2025.
- ^ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (August 2006). "The 78th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 5721: 1–45. Bibcode:2006IBVS.5721....1K. Retrieved 13 September 2025.
- ^ 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. arXiv:2303.12587. Bibcode:2023ApJ...948...77Y. doi:10.3847/1538-4357/acc175.
- ^ 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. arXiv:2106.08865. doi:10.1051/0004-6361/202141018. S2CID 235446900.
External links
[edit]- Discovery of Very High Energy Gamma Rays Associated with an X-ray Binary (Science Express) July 7, 2005
- Astronomers Discovery Very High Energy Gamma-ray Emission From Microquasar (ScienceDaily) May 19, 2006
See also
[edit]- LS I +61 303, the only other known VHE gamma ray producing system
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