ε Gruis, Latinised as Epsilon Gruis, is a blue-white hued star in the southern constellation of Grus. It is visible to the naked eye, having an apparent visual magnitude of 3.5.[2] Based upon an annual parallax shift of 25.30 mas as measured from Earth,[1] it is located around 129 light years from the Sun. The system may be moving closer to the Sun with a radial velocity of about −0.4 km/s.[4]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Grus |
| Right ascension | 22h 48m 33.29833s[1] |
| Declination | −51° 19′ 00.7001″[1] |
| Apparent magnitude (V) | 3.466[2] |
| Characteristics | |
| Spectral type | A2 IVn[3] |
| B−V color index | 0.09[2] |
| Astrometry | |
| Radial velocity (Rv) | −0.4±2.1[4] km/s |
| Proper motion (μ) | RA: +108.43[1] mas/yr Dec.: −64.83[1] mas/yr |
| Parallax (π) | 25.30 ± 0.48 mas[1] |
| Distance | 129 ± 2 ly (39.5 ± 0.7 pc) |
| Absolute magnitude (MV) | +0.52[5] |
| Details | |
| Mass | 1.85[6] M☉ |
| Surface gravity (log g) | 3.47±0.14[6] cgs |
| Temperature | 8,685±295[6] K |
| Metallicity [Fe/H] | −0.16[3] dex |
| Rotational velocity (v sin i) | 235.1±11.8[5] km/s |
| Age | 249[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an A-type subgiant of spectral type A2IVn,[3] a star that has used up its core hydrogen and has begun to expand off the main sequence. At the estimated age of 249 million years,[6] it is spinning rapidly with a projected rotational velocity of 235 km/s.[5] This is giving the star an oblate shape with an equatorial bulge that is an estimated 18% larger than the polar radius.[8] The star displays an infrared excess, suggesting the presence of a circumstellar disk of orbiting dust.[9]
Epsilon Gruis is suspected of having a moderately active[10] close companion,[11] which is most likely the source of the weak X-ray emission from these coordinates with a luminosity of 1.3×1028 erg s−1.[10]
References
edit- ^ a b c d e f 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.
- ^ a b c Høg, E.; et al. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics, 355: L27, Bibcode:2000A&A...355L..27H, doi:10.1888/0333750888/2862, ISBN 978-0333750889.
- ^ a b c Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
- ^ a b Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
- ^ a b c Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID 53666672.
- ^ a b c d e David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ "eps Gru". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-22.
- ^ Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
- ^ Ertel, S.; et al. (October 2014), "A near-infrared interferometric survey of debris-disk stars. IV. An unbiased sample of 92 southern stars observed in H band with VLTI/PIONIER", Astronomy & Astrophysics, 570: 20, arXiv:1409.6143, Bibcode:2014A&A...570A.128E, doi:10.1051/0004-6361/201424438, S2CID 9594917, A128.
- ^ a b Schröder, C.; et al. (June 2008), "Magnetic fields in A-type stars associated with X-ray emission", Astronomy and Astrophysics, 484 (2): 479–486, Bibcode:2008A&A...484..479S, doi:10.1051/0004-6361:20078963.
- ^ 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.