Phi Serpentis

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]

Phi Serpentis
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[1] mas
Distance241 ± 8 ly
(74 ± 2 pc)
Absolute magnitude (MV)+1.33[3]
Details
Mass1.19[3] M☉
Radius4.2[4] R☉
Luminosity41.7[5] L☉
Surface gravity (log g)2.65±0.09[6] cgs
Temperature4,493±22[6] K
Metallicity [Fe/H]0.01±0.05[6] dex
Rotational velocity (v sin i)2.0[7] km/s
Age3.42[5] Gyr
Other designations
φ Ser, BD+14° 2969, HD 142980, HIP 78132, HR 5940, SAO 101834.[8]
Database references
SIMBADdata

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. 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.
  2. 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: 667–679, Bibcode:1975MNRAS.172..667J, doi:10.1093/mnras/172.3.667.
  3. 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.
  4. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (3rd ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  5. 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.
  6. 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.
  7. Massarotti, Alessandro; et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity" (PDF), The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
  8. "phi Ser". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-23.
  9. 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.
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