| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| Right ascension | 03 09 36.74277 |
| Declination | +29° 04′ 37.4872″ |
| Apparent magnitude (V) | 5.72 |
| Characteristics | |
| Spectral type | B8 III |
| U−B color index | –0.15 |
| B−V color index | +0.115±0.005 |
| Astrometry | |
| Radial velocity (Rv) | −2.0±4.3 km/s |
| Proper motion (μ) | RA: +19.192 mas/yr Dec.: −12.057 mas/yr |
| Parallax (π) | 3.5853 ± 0.1194 mas |
| Distance | 910 ± 30 ly (279 ± 9 pc) |
| Absolute magnitude (MV) | −1.75 |
| Details | |
| Mass | 4.1 M☉ |
| Radius | 9.49+0.32 −0.56 R☉ |
| Luminosity | 326±13 L☉ |
| Surface gravity (log g) | 2.948±0.023 cgs |
| Temperature | 7,961+246 −128 K |
| Rotational velocity (v sin i) | 196±10 km/s |
| Other designations | |
| 55 Ari, BD+28°499, FK5 1088, GC 3762, HD 19548, HIP 14677, HR 944, SAO 75757 | |
| Database references | |
| SIMBAD | data |
55 Arietis is a single star in the northern zodiac constellation of Aries. 55 Arietis is the Flamsteed designation. It is faintly visible to the naked eye as a dim, blue-white hued point of light with an apparent visual magnitude of 5.72. Based upon an annual parallax shift of 3.6 mas, it is approximately 910 light-years (280 parsecs) distant from Earth, give or take a 30 light-year margin of error. Eggen (1995) listed it as a proper motion candidate for membership in the IC 2391 supercluster. It may be a runaway star, having a peculiar velocity of 25.9+3.9
−6.1 km/s relative to its neighbors.
The spectrum of this star matches a B-type giant with a stellar classification of B8 III. It has a high rate of spin, showing a projected rotational velocity of 196 km/s. The star has 4.1 times the mass of the Sun but 9.5 times the Sun's radius. It is radiating 326 times as much luminosity as the Sun from its photosphere at an effective temperature of 7,961 K.
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.
- ^ Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N.
- ^ Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- ^ 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.
- ^ Huang, W.; et al. (2010), "A Stellar Rotation Census of B Stars: From ZAMS to TAMS", The Astrophysical Journal, 722 (1): 605–619, arXiv:1008.1761, Bibcode:2010ApJ...722..605H, doi:10.1088/0004-637X/722/1/605, S2CID 118532653.
- "55 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-31.
- Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- Eggen, Olin J. (December 1995), "Reality Tests of Superclusters in the Young Disk Population", Astronomical Journal, 110: 2862, Bibcode:1995AJ....110.2862E, doi:10.1086/117734.
- Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
External links
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