Astronomy:LS 5039
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Short description: Binary star system in the constellation Scutum
Coordinates: 
18h 26m 15.0568s, −14° 50′ 54.242″
| 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 |
| 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 | |
| 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]
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.[6]
References
- ↑ 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. https://ui.adsabs.harvard.edu/abs/2011MNRAS.411.1293S. Retrieved 24 March 2022.
- ↑ 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.
- ↑ 3.0 3.1 Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. Bibcode: 2012yCat.1322....0Z.
- ↑ 4.0 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.
- ↑ "V* V479 Sct". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+V479+Sct.
- ↑ 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.
External links
- 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
- LS I +61 303, the only other known VHE gamma ray producing system
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