Astronomy:Epsilon Antliae
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Antlia[1] |
| Right ascension | 09h 29m 14.720s[2] |
| Declination | −35° 57′ 04.81″[2] |
| Apparent magnitude (V) | +4.51[3] |
| Characteristics | |
| Spectral type | K3 IIIa[4] |
| U−B color index | +1.68[5] |
| B−V color index | +1.44[5] |
| Astrometry | |
| Radial velocity (Rv) | +22.2[3] km/s |
| Proper motion (μ) | RA: −24.844[2] mas/yr Dec.: +5.720[2] mas/yr |
| Parallax (π) | 4.6349 ± 0.0920[2] mas |
| Distance | 700 ± 10 ly (216 ± 4 pc) |
| Absolute magnitude (MV) | −2.17[1] |
| Details | |
| Mass | 2.3[6] M☉ |
| Radius | 53[7] R☉ |
| Luminosity | 901[7] L☉ |
| Surface gravity (log g) | 1.86[6] cgs |
| Temperature | 4.348[7] K |
| Metallicity [Fe/H] | −0.14[6] dex |
| Rotational velocity (v sin i) | 3.3[8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Epsilon Antliae is a single[10] star in the southern constellation of Antlia.[1] It is positioned near the western constellation border and forms part of the main asterism.[11] The Bayer designation is Latinized from ε Antliae, and abbreviated Eps Ant or ε Ant, respectively. The apparent visual magnitude of this star is +4.51,[3] which means it is visible to the naked eye at night. From parallax measurements, the distance to this star is approximately 700 light-years (210 parsecs).[2] It is drifting further away from the Sun with a radial velocity of +22 km/s.[3]
The stellar classification of this star is K3 IIIa,[4] 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.[2] Photometry measurements during the Hipparcos mission indicate that this star is undergoing periodic luminosity variation by 0.0034 magnitudes over an 11.07941 day cycle.[12]
See also
- Antlia 2
References
- ↑ 1.0 1.1 1.2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 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 (Astronomisches Rechen-Institut Heidelberg) 35 (35): 1, Bibcode: 1999VeARI..35....1W.
- ↑ 4.0 4.1 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
- ↑ 5.0 5.1 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.
- ↑ 6.0 6.1 6.2 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G. et al. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics 691: A98. doi:10.1051/0004-6361/202451427. Bibcode: 2024A&A...691A..98K.
- ↑ 7.0 7.1 7.2 Fetherolf, Tara; Pepper, Joshua; Simpson, Emilie; Kane, Stephen R.; Močnik, Teo; English, John Edward; Antoci, Victoria; Huber, Daniel et al. (2023). "Variability Catalog of Stars Observed during the TESS Prime Mission". The Astrophysical Journal Supplement Series 268 (1): 4. doi:10.3847/1538-4365/acdee5. Bibcode: 2023ApJS..268....4F.
- ↑ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy and Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. Bibcode: 2014A&A...561A.126D.
- ↑ "eps Ant". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=eps+Ant.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 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, doi:10.1046/j.1365-8711.2002.05150.x, Bibcode: 2002MNRAS.331...45K.
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