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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]

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.[10] The star displays an infrared excess, suggesting the presence of a circumstellar disk of orbiting dust.[11]

Epsilon Gruis is suspected of having a moderately active[12] close companion,[13] 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.[12]

References

  1. ^ 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.
  2. ^ 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.{{citation}}: CS1 maint: work parameter with ISBN (link)
  3. ^ 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.
  4. ^ 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.
  5. ^ 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.
  6. ^ 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.
  7. ^ a b Tuchow, Noah W.; Stark, Christopher C.; Mamajek, Eric (2024). “HPIC: The Habitable Worlds Observatory Preliminary Input Catalog”. The Astronomical Journal. 167 (3): 139. Bibcode:2024AJ….167..139T. doi:10.3847/1538-3881/ad25ec.
  8. ^ Sikora, J.; David-Uraz, A.; Chowdhury, S.; Bowman, D. M.; Wade, G. A.; Khalack, V.; Kobzar, O.; Kochukhov, O.; Neiner, C.; Paunzen, E. (2019). “MOBSTER – II. Identification of rotationally variable a stars observed with TESS in sectors 1-4”. Monthly Notices of the Royal Astronomical Society. 487 (4): 4695. arXiv:1905.08835. Bibcode:2019MNRAS.487.4695S. doi:10.1093/mnras/stz1581.
  9. ^ “eps Gru”. SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-22.
  10. ^ 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.
  11. ^ 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.
  12. ^ 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.
  13. ^ 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.