Epsilon Antliae, Latinized from ε Antliae, is the Bayer designation for a single[8] star in the southern constellation of Antlia, being positioned near the western constellation border and forming part of the main asterism.[9] The apparent visual magnitude of this star is 4.51,[2] which means it is visible to the naked eye. From parallax measurements, the distance to this star is known to be 590 ± 30 light-years (180.9 ± 9.2 parsecs). It is drifting further away from the Sun with a radial velocity of 22 km/s.[2]
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Antlia |
| Right ascension | 09h 29m 14.71968s[1] |
| Declination | –35° 57′ 04.8074″[1] |
| Apparent magnitude (V) | 4.51[2] |
| Characteristics | |
| Spectral type | K3 IIIa[3] |
| U−B color index | 1.68[4] |
| B−V color index | 1.44[4] |
| Astrometry | |
| Radial velocity (Rv) | 22.2[2] km/s |
| Proper motion (μ) | RA: −24.774±0.306[5] mas/yr Dec.: 5.702±0.357[5] mas/yr |
| Parallax (π) | 5.5233 ± 0.2778 mas[5] |
| Distance | 590 ± 30 ly (181 ± 9 pc) |
| Absolute magnitude (MV) | −2.17[6] |
| Details | |
| Radius | 56.3 3.7 −7.5[5] R☉ |
| Luminosity | 919±52[5] L☉ |
| Temperature | 4,237 315 −134[5] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
The stellar classification of this star is K3 IIIa,[3] where the luminosity class of III indicates that this is an evolved giant star that has exhausted the supply of hydrogen at its core. It has expanded to around 56 times the radius of the Sun and radiates approximately 919 times the Sun's luminosity from its photosphere at an effective temperature of 4,237 K.[5] Photometry measurements during the Hipparcos mission indicate that this star is undergoing periodic variability by 0.0034 magnitudes over an 11.07941 day cycle.[10]
See also
editReferences
edit- ^ a b van Leeuwen, F. (November 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.
- ^ a b c d Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg, 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode:1999VeARI..35....1W.
- ^ a b 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.
- ^ a b Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
- ^ a b c d e f g 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.
- ^ "eps Ant". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-06-25.
{{cite web}}: CS1 maint: postscript (link) - ^ 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.
- ^ Streicher, Magda (June 2010), "Antlia, the Machine Pneumatique", Monthly Notes of the Astronomical Society of South Africa, 69 (5 and 6): 107–112, Bibcode:2010MNSSA..69..107S.
- ^ Koen, Chris; Eyer, Laurent (March 2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331 (1): 45–59, arXiv:astro-ph/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x, S2CID 10505995.