HD 109749
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 12h 37m 16.3781s |
| Declination | −40° 48′ 43.619″ |
| Apparent magnitude (V) | 8.1 |
| Distance | 192 ly (59 pc) |
| Spectral type | G3IV |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Extrasolar Planets Encyclopaedia | data |
HD 109749 is a binary star about 192 light years away in the constellation of Centaurus.
Stellar system
The primary star, HD 109749 A, is a G-type subgiant with a spectral type of G3IV,[1] indicating it is an evolved star with a luminosity higher than that of a main sequence star. It has a mass of 1.14 M☉ and a radius of 1.21 R☉. The star is shining with a luminosity of 1.55 L☉ and has an effective temperature of 5,860 K. Evolutionary models estimate an age of 4.1 billion years.[2] HD 109749 A is chromospherically inactive and has a high metallicity, with an iron abundance 78% larger than the Sun's.[1]
The secondary star, HD 109749 B, is a K-type main sequence star with an apparent magnitude of 10.3.[3] It has a mass of about 0.78 M☉ and is located at a separation of 8.4 arcseconds, which corresponds to a projected separation of 500 AU. 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.[4]
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 0.28 MJ and an semimajor axis of 0.06 AU.[1]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >0.28 ± 0.016 MJ | 0.0635 | 5.240 ± 0.002 | 0.01 ± 0.01 | — | — |
See also
References
- 1 2 3 4 Fischer, Debra A.; et al. (2006). "The N2K Consortium. III. Short-Period Planets Orbiting HD 149143 and HD 109749". The Astrophysical Journal. 637 (2): 1094–1101. Bibcode:2006ApJ...637.1094F. doi:10.1086/498557.
- ↑ Bonfanti, A.; Ortolani, S.; Nascimbeni, V. (2016). "Age consistency between exoplanet hosts and field stars". Astronomy & Astrophysics. 585: A5, 14 pp. arXiv:1511.01744. Bibcode:2016A&A...585A...5B. doi:10.1051/0004-6361/201527297.
- ↑ "HD 109749B -- High proper-motion Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2018-01-20.
- ↑ Desidera, S.; Barbieri, M. (January 2007). "Properties of planets in binary systems. The role of binary separation". Astronomy and Astrophysics. 462 (1): 345–353. arXiv:astro-ph/0610623. Bibcode:2007A&A...462..345D. doi:10.1051/0004-6361:20066319.
