HD 109749
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 8.08[2] |
| Characteristics | |
| Spectral type | G3 IV[3] or G3 V + K5 V[4] |
| B−V Template:Engvar | 0.714±0.021[2] |
| Astrometry | |
| Radial velocity (Rv) | −13.24±0.18[2] km/s |
| Proper motion (μ) | RA: −157.308 mas/yr[1] Dec.: −6.357 mas/yr[1] |
| Parallax (π) | 15.8134±0.0263 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 4.34[2] |
| Details | |
| HD 109749 A | |
| Mass | 1.10[5] Template:Solar mass |
| Radius | 1.21±0.02[6] Template:Solar radius |
| Luminosity | 1.55±0.02[6] Template:Solar luminosity |
| Surface gravity (log g) | 4.32±0.02[6] cgs |
| Temperature | 5,860±39[6] K |
| Metallicity [Fe/H] | 0.25±0.05[3] dex |
| Rotation | Script error: No such module "val".[3] |
| Rotational velocity (v sin i) | 2.5±0.5[3] km/s |
| Age | 4.10±0.70[6] Gyr |
| HD 109749 B | |
| Mass | 0.78[5] Template:Solar mass |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[7] | |
| Database references | |
| SIMBAD | data |
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HD 109749 is a binary star system about 206 light years away in the constellation of Centaurus. The pair have a combined apparent visual magnitude of 8.08,[2] which is too faint to be visible to the naked eye. The primary component has a close orbiting exoplanet companion. The system is drifting closer with a heliocentric radial velocity of −13.2 km/s.[2]
The primary component, HD 109749 A, is a G-type subgiant star with a spectral type of G3IV,[3] indicating it is an evolved star with a luminosity higher than that of a main sequence star. It has a mass of Template:Solar mass and a radius of Template:Solar radius. The star is shining with a luminosity of Template:Solar luminosity and has an effective temperature of 5,860 K. Evolutionary models estimate an age of 4.1 billion years.[6] HD 109749 A is chromospherically inactive and has a high metallicity, with an iron abundance 178% of Sun's.[3]
The secondary, HD 109749 B, is a K-type main sequence star with an apparent magnitude of 10.3.[8] It has a mass of about Template:Solar mass and is located at a separation of 8.4 arcseconds, which corresponds to a projected separation of 490 AU.[5] This star has the same proper motion as the primary and seems to be at the same distance, confirming they form a physical binary system.[9]
Planetary system
In 2005, an exoplanet was discovered around HD 109749 A. It was detected by the radial velocity method as part of the N2K Consortium. It is a hot Jupiter with a minimum mass of Template:Jupiter mass and a semimajor axis of 0.06 AU.[3]
Template:OrbitboxPlanet begin Template:OrbitboxPlanet
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See also
References
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