LS 5039
Template:Short description Template:Sky
File:V479SctLightCurve.png A broad-band optical light curve for V479 Scuti, adapted from Sarty et al. (2011)[1] | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scutum |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[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 | Script error: No such module "val".[4] ly (Script error: No such module "val".[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 | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Surface gravity (log g) | 3.85 cgs |
| Temperature | 39000 K |
| Rotational velocity (v sin i) | 113 km/s |
| Black hole | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Probably 10.93 km |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[5] | |
| Database references | |
| SIMBAD | data |
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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
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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