HD 13189 is a star with an orbiting companion in the northern constellation of Triangulum constellation. With an apparent visual magnitude of +7.57,[2] it is too faint to be visible to the normal human eye. The distance to this system is approximately 1,590 light years based on parallax measurements, and it is drifting further away with a radial velocity of 25.39 km/s.[5] In 2005, a planetary companion or brown dwarf was announced in orbit around this star.[2]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Triangulum |
| Right ascension | 02h 09m 40.1723s[1] |
| Declination | +32° 18′ 59.161″[1] |
| Apparent magnitude (V) | +7.57[2] |
| Characteristics | |
| Spectral type | K1II-III[3] |
| B−V color index | 1.465±0.016[4] |
| Astrometry | |
| Radial velocity (Rv) | 25.39[5] km/s |
| Proper motion (μ) | RA: 2.306±0.024 mas/yr[1] Dec.: 4.935±0.022 mas/yr[1] |
| Parallax (π) | 2.0450 ± 0.0240 mas[1] |
| Distance | 1,590 ± 20 ly (489 ± 6 pc) |
| Absolute magnitude (MV) | −0.3[6] |
| Details | |
| Mass | 1.2[7] M☉ |
| Radius | 38[8] R☉ |
| Luminosity | 503[1] L☉ |
| Surface gravity (log g) | 1.21[7] cgs |
| Temperature | 4,035[7] K |
| Metallicity [Fe/H] | −0.18[7] dex |
| Age | 4.4[9] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
It has a spectral classification of K1II-III, making it a giant star that has evolved away from the main sequence after exhausting the hydrogen at its core. The mass is 1.2 times the Sun's, while measurements of the star's radius give estimates of 38 R☉. The atmosphere of the star displays short period radial velocity variations with a primary period of 4.89 days. This behavior is typical for giant K-type stars such as this and it is not the result of a close-orbit planetary companion.[11]
HD 13189 b edit
| Discovery | |
|---|---|
| Discovered by | Hatzes et al. |
| Discovery site | Tautenburg, Germany |
| Discovery date | 2005 |
| Radial Velocity | |
| Orbital characteristics | |
| 1.85 ± 0.35 AU (277,000,000 ± 52,000,000 km) | |
| Eccentricity | 0.28 ± 0.06 |
| 471.6 ± 6 d | |
| 2452327.9 ± 20.2 | |
| 160.7 ± 12 | |
| Semi-amplitude | 6.8 ± 1.5 |
| Physical characteristics | |
| Mass | >14 ± 6 MJ |
HD 13189 b is an exoplanet or brown dwarf with mass ranges from 8 to 20 Jupiter mass. This object is located at a mean distance of 277 Gm (1.85 AU) from the star, taking 472 days to make one elliptical orbit.
This object was discovered in Tautenburg, Germany in 2005.[12]
References edit
- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c Hatzes, A. P.; et al. (2005). "A giant planet around the massive giant star HD 13189". Astronomy and Astrophysics. 437 (2): 743–751. Bibcode:2005A&A...437..743H. doi:10.1051/0004-6361:20052850.
- ^ Lee, B.-C.; et al. (May 2011). "A likely exoplanet orbiting the oscillating K-giant α Arietis". Astronomy & Astrophysics. 529: A134. arXiv:1104.4431. Bibcode:2011A&A...529A.134L. doi:10.1051/0004-6361/201016293. S2CID 58906630.
- ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- ^ a b Famaey, B.; et al. (January 2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430 (1): 165–186. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. S2CID 17804304.
- ^ Gontcharov, G. A. (2011). "The red giant branch in the Tycho-2 catalogue". Astronomy Letters. 37 (10): 707–717. arXiv:1607.00557. Bibcode:2011AstL...37..707G. doi:10.1134/S1063773711090040. S2CID 119272127.
- ^ a b c d Anders, F.; et al. (2022). "VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)". Vizier Online Data Catalog. Bibcode:2022yCat.1354....0A.
- ^ Stassun, Keivan G.; Collins, Karen A.; Gaudi, B. Scott (2017). "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes". The Astronomical Journal. 153 (3): 136. arXiv:1609.04389. Bibcode:2017AJ....153..136S. doi:10.3847/1538-3881/aa5df3. S2CID 119219062.
- ^ Maldonado, J.; Villaver, E. (2016). "Evolved stars and the origin of abundance trends in planet hosts". Astronomy and Astrophysics. 588: A98. arXiv:1602.00835. Bibcode:2016A&A...588A..98M. doi:10.1051/0004-6361/201527883. S2CID 119212009.
- ^ "HD 13189 -- Star". SIMBAD. Retrieved 2011-12-13.
- ^ Hatzes, Artie P.; Zechmeister, Mathias (October 2008). "Stellar oscillations in planet-hosting giant stars". Journal of Physics: Conference Series. 118 (1): 012016. Bibcode:2008JPhCS.118a2016H. doi:10.1088/1742-6596/118/1/012016.
- ^ A Giant Planet Around The Massive Giant Star HD 13189 Archived 2015-07-20 at the Wayback Machine
External links edit
- "HD 13189 -- Star". SIMBAD. Retrieved December 21, 2007.
- "HD 13189 b -- Extra-solar Planet Candidate". SIMBAD. Retrieved December 21, 2007.