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Phi Serpentis 
Summary
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]
| Observation data Epoch J2000.0 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 mas[1] |
| 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 |
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 edit
- ^ a b c d e 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 d 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, Bibcode:1975MNRAS.172..667J, doi:10.1093/mnras/172.3.667.
- ^ a b c d e f Hekker, S.; et al. (August 2006), "Precise radial velocities of giant stars. I. Stable stars", Astronomy and Astrophysics, 454 (3): 943–949, arXiv:astro-ph/0604502, Bibcode:2006A&A...454..943H, doi:10.1051/0004-6361:20064946, S2CID 119529768.
- ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (3rd ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ a b c d Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
- ^ a b c d Wu, Yue; et al. (January 2011), "Coudé-feed stellar spectral library - atmospheric parameters", Astronomy and Astrophysics, 525: A71, arXiv:1009.1491, Bibcode:2011A&A...525A..71W, doi:10.1051/0004-6361/201015014, S2CID 53480665.
- ^ 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, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209, S2CID 121883397.
- ^ "phi Ser". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-23.
{{cite web}}: CS1 maint: postscript (link) - ^ 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.