Epsilon Piscis Austrini
star in the constellation Piscis Austrinus
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Epsilon Piscis Austrini, also known as ε Piscis Austrini, is a blue-white star in the constellation of Piscis Austrinus. It can be seen with the naked eye and has an apparent visual magnitude of +4.17.[1] The system is located about 400 light years from the Sun and has an annual parallax shift of 8.0981 ± 0.3582 mas as seen from the GAIA satellite.[2]
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Piscis Austrinus |
| Right ascension | 22h 40m 39.34075s[3] |
| Declination | −27° 02′ 37.0157″[3] |
| Apparent magnitude (V) | +4.17[1] |
| Characteristics | |
| Spectral type | B8 Ve[4] or B8 IVe[5] |
| U−B color index | −0.31[1] |
| B−V color index | −0.11[1] |
| Astrometry | |
| Radial velocity (Rv) | +1.1±2.8 km/s |
| Proper motion (μ) | RA: +23.22[3] mas/yr Dec.: −0.16[3] mas/yr |
| Parallax (π) | 8.0981 ± 0.3582[2] mas |
| Distance | 400 ± 20 ly (123 ± 5 pc) |
| Absolute magnitude (MV) | −1.66[5] |
| Details | |
| Mass | 4.10±0.19[6] M☉ |
| Radius | 3.2[7] R☉ |
| Luminosity | 661[6] L☉ |
| Surface gravity (log g) | 3.93[8] cgs |
| Temperature | 11,066[6] K |
| Rotational velocity (v sin i) | 216[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
References
change- ↑ 1.0 1.1 1.2 1.3 Feinstein, A.; Marraco, H. G. (November 1979), "The photometric behavior of Be Stars", Astronomical Journal, 84: 1713–1725, Bibcode:1979AJ.....84.1713F, doi:10.1086/112600.
- ↑ 2.0 2.1 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.
- ↑ 3.0 3.1 3.2 3.3 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ↑ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
- ↑ 5.0 5.1 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.
- ↑ 6.0 6.1 6.2 6.3 Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ↑ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (3rd ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ↑ Chauville, J.; et al. (November 2001), "High and intermediate-resolution spectroscopy of Be stars 4481 lines", Astronomy and Astrophysics, 378: 8618–82, Bibcode:2001A&A...378..861C, doi:10.1051/0004-6361:20011202.
- ↑ "eps PsA -- Be Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-05-18.