Astronomy:Phi2 Pavonis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Pavo |
| Right ascension | 20h 40m 02.63822s[1] |
| Declination | −60° 32′ 56.0200″[1] |
| Apparent magnitude (V) | +5.10[2] |
| Characteristics | |
| Spectral type | G0 V Fe-0.8 CH-0.5[3] |
| U−B color index | −0.02[2] |
| B−V color index | +0.53[2] |
| Astrometry | |
| Radial velocity (Rv) | −32.02±0.05[4] km/s |
| Proper motion (μ) | RA: +313.48[1] mas/yr Dec.: −569.91[1] mas/yr |
| Parallax (π) | 40.55 ± 0.27[1] mas |
| Distance | 80.4 ± 0.5 ly (24.7 ± 0.2 pc) |
| Details[4] | |
| Mass | 1.09±0.02 M☉ |
| Radius | 1.86±0.05 R☉ |
| Luminosity | 3.39 L☉ |
| Surface gravity (log g) | 4.20±0.02 cgs |
| Temperature | 6,091±27 K |
| Metallicity [Fe/H] | −0.38±0.04 dex |
| Rotation | 27.7±1.7 d[5] |
| Rotational velocity (v sin i) | 1.95±0.43 km/s |
| Age | 5.69±0.24 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
Phi2 Pavonis (φ2 Pav, φ2 Pavonis) is a solitary[7] star in the southern constellation of Pavo (the Peacock). It is faintly visible to the naked eye with an apparent visual magnitude of +5.10.[2] Based upon an annual parallax shift of 40.55 mas as seen from Earth, it is located 80.4 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.07 due to interstellar dust. It is a member of the thin disk population.[4]
This is a yellow-white hued G-type main sequence star with a stellar classification of G0 V Fe-0.8 CH-0.5.[3] This notation indicates the surface abundance of iron and cyanogen are below normal for this class of star. It is around 5.7[4] billion years old and is spinning with a period of around 28 days.[5] It has an estimated 1.09 times the mass of the Sun and is 1.86 times the Sun's radius. The star is radiating 3.39 times the solar luminosity from its photosphere at an effective temperature of 6,091 K.[4]
This system was in 1991 a test case for the Zeta Herculis moving group, of low metallicity stars with 5 billion years of age. This group includes besides Zeta Herculis: δ Trianguli, ζ Reticuli, 1 Hydrae, Gl 456, Gl 678, and Gl 9079.[8]
In 1998, using the European Southern Telescope in Chile, a planet was announced to be orbiting the star.[9] This team retracted this claim in 2002, but found a different periodicity of 7 days possibly due to stellar rotation.[10]
See also
References
- ↑ 1.0 1.1 1.2 1.3 1.4 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.
- ↑ 2.0 2.1 2.2 2.3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data (SIMBAD), Bibcode: 1986EgUBV........0M.
- ↑ 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 4.3 4.4 Jofré, E. et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics 574: A50, doi:10.1051/0004-6361/201424474, Bibcode: 2015A&A...574A..50J.
- ↑ 5.0 5.1 Olmedo, Manuel et al. (December 2013), "Mg II h + k Flux—Rotational Period Correlation for G-type Stars", Publications of the Astronomical Society of the Pacific 125 (934): 1436, doi:10.1086/674332, Bibcode: 2013PASP..125.1436O.
- ↑ "phi02 Pav". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=phi02+Pav.
- ↑ 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.
- ↑ de Mello, G. F. Porto; da Silva, L. (1991), "On the physical existence of the Zeta HER moving group – A detailed analysis of Phi exp 2 Pavonis", Astronomical Journal 102: 1816–1825, doi:10.1086/116006, Bibcode: 1991AJ....102.1816P
- ↑ Kürster, M. (1998), "The ESO radial velocity planet search program", Workshop: Science with Gemini: 58, Bibcode: 1998swg..work...58K.
- ↑ Endl, M. et al. (2002), "The planet search program at the ESO Coudé Echelle spectrometer III. The complete Long Camera survey results", Astronomy & Astrophysics 392 (2): 671–690, doi:10.1051/0004-6361:20020937, Bibcode: 2002A&A...392..671E.
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