Astronomy:Phi Gruis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Grus |
| Right ascension | 23h 18m 09.88466s[1] |
| Declination | −40° 49′ 27.7034″[1] |
| Apparent magnitude (V) | 5.49[2] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | F4 V[3] |
| U−B color index | −0.05[2] |
| B−V color index | +0.47[2] |
| Astrometry | |
| Radial velocity (Rv) | +15.15±0.29[1] km/s |
| Proper motion (μ) | RA: +126.920[1] mas/yr Dec.: −122.577[1] mas/yr |
| Parallax (π) | 29.3153 ± 0.1115[1] mas |
| Distance | 111.3 ± 0.4 ly (34.1 ± 0.1 pc) |
| Absolute magnitude (MV) | 2.82[4] |
| Details[5] | |
| Mass | 1.45+0.02 −0.01 M☉ |
| Radius | 1.87+0.07 −0.04[1] R☉ |
| Luminosity | 5.84±0.03[1] L☉ |
| Surface gravity (log g) | 4.06±0.02 cgs |
| Temperature | 6,606±63 K |
| Metallicity [Fe/H] | 0.00±0.05 dex |
| Rotational velocity (v sin i) | 19.9±1.0[4] km/s |
| Age | 2.12+0.22 −0.16 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Phi Gruis, Latinised from φ Gruis, is a solitary,[7] yellow-white hued star in the southern constellation of Grus, near the eastern constellation border with Phoenix. It is faintly visible to the naked eye with an apparent visual magnitude of +5.49.[2] Based upon an annual parallax shift of 29.3 mas as seen from the Earth,[8] it lies at a distance of 111 light years from the Sun. The star is drifting further away with a radial velocity of +15 km/s.[1]
This object is an F-type main-sequence star with a stellar classification of F4 V,[3] where the luminosity class of 'V' indicates it is currently generating energy through hydrogen fusion at its core. It is 2.12[5] billion years old and is spinning with a projected rotational velocity of 20 km/s.[4] The star has 1.45[5] times the mass of the Sun and 1.87[1] times the Sun's radius. It is radiating 5.8[1] times as much luminosity as the Sun from its photosphere at an effective temperature of 6,606 km/s.[5]
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Przybylski, A.; Kennedy, P. M. (1965), "Radial velocities and three-colour photometry of 166 southern stars", Monthly Notices of the Royal Astronomical Society 131: 95–104, doi:10.1093/mnras/131.1.95, Bibcode: 1965MNRAS.131...95P.
- ↑ 3.0 3.1 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, doi:10.1086/504637, Bibcode: 2006AJ....132..161G.
- ↑ 4.0 4.1 4.2 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, doi:10.1051/0004-6361/201118724, Bibcode: 2012A&A...542A.116A.
- ↑ 5.0 5.1 5.2 5.3 Aguilera-Gómez, Claudia; Ramírez, Iván; Chanamé, Julio (June 2018), "Lithium abundance patterns of late-F stars: an in-depth analysis of the lithium desert", Astronomy & Astrophysics 614: 15, doi:10.1051/0004-6361/201732209, A55, Bibcode: 2018A&A...614A..55A.
- ↑ "phi Gru -- Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=phi+Gru, retrieved 2017-06-19.
- ↑ 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.
- ↑ van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
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