Astronomy:Phi Serpentis
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Short description: Star in the constellation Serpens
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Serpens |
| Right ascension | 15h 57m 14.57093s[1] |
| Declination | +14° 24′ 52.1359″[1] |
| Apparent magnitude (V) | +5.55[2] |
| Characteristics | |
| Spectral type | K1 IV[3] |
| U−B color index | +0.997[2] |
| B−V color index | +1.142[2] |
| Astrometry | |
| Radial velocity (Rv) | −70.98±0.17[3] km/s |
| Proper motion (μ) | RA: −122.48[1] mas/yr Dec.: +88.16[1] mas/yr |
| Parallax (π) | 13.52 ± 0.44[1] mas |
| Distance | 241 ± 8 ly (74 ± 2 pc) |
| Absolute magnitude (MV) | +1.33[3] |
| Details | |
| Mass | 1.19[3] M☉ |
| Radius | 4.2[4] R☉ |
| Luminosity | 41.7[5] L☉ |
| Surface gravity (log g) | 2.65±0.09[6] cgs |
| Temperature | 4,493±22[6] K |
| Metallicity [Fe/H] | 0.01±0.05[6] dex |
| Rotational velocity (v sin i) | 2.0[7] km/s |
| Age | 3.42[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Phi Serpentis (φ Ser, φ Serpentis) is a solitary[9] star in the Serpens Caput portion of the equatorial constellation Serpens. Based upon an annual parallax shift of 13.52 mas as seen from Earth, it is located about 241 light years distant. The star is faintly visible to the naked eye with an apparent visual magnitude of +5.55.[2]
At the estimated age of 3.42 billion years,[5] this is an evolved K-type subgiant star with a stellar classification of K1 IV.[3] It has about 1.19[3] times the mass of the Sun and around 4.2[4] times the Sun's radius. The star radiates 41.7[5] times the solar luminosity from its photosphere at an effective temperature of 4,493 K.[6]
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 Jennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants", Monthly Notices of the Royal Astronomical Society 172 (3): 667–679, doi:10.1093/mnras/172.3.667, Bibcode: 1975MNRAS.172..667J.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Hekker, S. et al. (August 2006), "Precise radial velocities of giant stars. I. Stable stars", Astronomy and Astrophysics 454 (3): 943–949, doi:10.1051/0004-6361:20064946, Bibcode: 2006A&A...454..943H.
- ↑ 4.0 4.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 5.0 5.1 5.2 5.3 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal 150 (3): 88, doi:10.1088/0004-6256/150/3/88, Bibcode: 2015AJ....150...88L.
- ↑ 6.0 6.1 6.2 6.3 Wu, Yue et al. (January 2011), "Coudé-feed stellar spectral library - atmospheric parameters", Astronomy and Astrophysics 525: A71, doi:10.1051/0004-6361/201015014, Bibcode: 2011A&A...525A..71W.
- ↑ Massarotti, Alessandro et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal 135 (1): 209–231, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M.
- ↑ "phi Ser". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=phi+Ser.
- ↑ 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.
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