| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aries |
| Right ascension | 02 30 54.39715 |
| Declination | +17° 42′ 13.8908″ |
| Apparent magnitude (V) | 6.21 |
| Characteristics | |
| Spectral type | G8 III-IV Fe-2 |
| B−V color index | 0.908±0.002 |
| Astrometry | |
| Radial velocity (Rv) | −122.71±0.28 km/s |
| Proper motion (μ) | RA: +33.774 mas/yr Dec.: −82.912 mas/yr |
| Parallax (π) | 11.6403 ± 0.1172 mas |
| Distance | 280 ± 3 ly (85.9 ± 0.9 pc) |
| Absolute magnitude (MV) | 1.48 |
| Orbit | |
| Period (P) | 130.706±0.008 d |
| Eccentricity (e) | 0.366±0.007 |
| Periastron epoch (T) | 53,480.1±0.4 MJD |
| Argument of periastron (ω) (secondary) | 275.5±0.7° |
| Semi-amplitude (K1) (primary) | 5.98±0.05 km/s |
| Details | |
| Mass | 1.29 M☉ |
| Radius | 7.04+0.29 −0.28 R☉ |
| Luminosity | 28.43 L☉ |
| Surface gravity (log g) | 2.77±0.21 cgs |
| Temperature | 4,788±49 K |
| Metallicity | −0.65±0.02 dex |
| Rotational velocity (v sin i) | 1.6 km/s |
| Age | 5.44 Gyr |
| Other designations | |
| 27 Ari, BD+17°380, FK5 1069, HD 15596, HIP 11698, HR 731, SAO 92983 | |
| Database references | |
| SIMBAD | data |
27 Arietis is a binary star system in the northern constellation of Aries. 27 Arietis is the Flamsteed designation. It is a dim, yellow-hued star that is close to the lower limit of what can be viewed with the naked eye, having an apparent visual magnitude is 6.21. The annual parallax shift of 11.64±0.12 mas corresponds to a physical distance of approximately 280 light-years (86 parsecs) from Earth. It is advancing closer to the Earth with a heliocentric radial velocity of −122.7 km/s, and may come as close as 84 light-years in around 643,000 years.
This appears to be a single-lined spectroscopic binary system with an orbital period of 130.7 days and an eccentricity of 0.366. It has an "a sin i" value of 10.00 ± 0.08 Gm (0.06685 ± 0.00053 AU), where a is the semimajor axis and i is the inclination to the line of sight from the Earth. This value provides a lower bound on the actual semimajor axis. The visible component has a stellar classification of G8 III-IV Fe-2, displaying mixed spectral traits of an evolved subgiant and a giant star, with a strong underabundance of iron. The CN bands of this star are very weak.
References
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ 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.
- ^ Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
- ^ Griffin, R. F. (October 2011), "Spectroscopic binary orbits from photoelectric radial velocities - Paper 220: 60 Piscium, 27 Arietis, EZ Ursae Majoris, and 4 Equulei", The Observatory, 131 (5): 294–314, Bibcode:2011Obs...131..294G.
- ^ Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
- Prugniel, P.; et al. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769, S2CID 54940439.
- "27 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-02.
External links
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