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60 Serpentis, also known as c Serpentis, is a single,[7] orange-hued star in Serpens Cauda, the eastern section of the constellation Serpens. It is faintly visible to the naked eye with an apparent visual magnitude of 5.38.[2] The distance to this star, as estimated from its annual parallax shift of 25.16±0.31 mas,[1] is approximately 130 light years. It is moving further from the Sun with a heliocentric radial velocity of +28 km/s,[4] having approached as close as 107 ly (32.7 pc) some 1.9 million years ago.[2]

60 Serpentis
Observation data
Epoch J2000      Equinox J2000
Constellation Serpens
Right ascension 18h 29m 40.97948s[1]
Declination −01° 59′ 07.1058″[1]
Apparent magnitude (V) 5.38[2]
Characteristics
Spectral type K0 III[3]
B−V color index 0.961±0.004[2]
Astrometry
Radial velocity (Rv)+28.36±0.34[4] km/s
Proper motion (μ) RA: −85.35[1] mas/yr
Dec.: −34.31[1] mas/yr
Parallax (π)25.16 ± 0.31 mas[1]
Distance130 ± 2 ly
(39.7 ± 0.5 pc)
Absolute magnitude (MV)1.25±0.07[5]
Details
Mass1.81±0.49[5] M☉
Radius8[4] R☉
Luminosity35[4] L☉
Surface gravity (log g)2.92±0.11[5] cgs
Temperature5,059±92[5] K
Metallicity [Fe/H]−0.08[4] dex
Rotational velocity (v sin i)3.9[4] km/s
Age1.26+0.19
−0.16[5] Myr
Other designations
c Ser, 60 Ser, BD−02° 4641, FK5 1480, HD 170474, HIP 90642, HR 6935, SAO 142348[6]
Database references
SIMBADdata

This is an evolved K-type giant star with a stellar classification of K0 III,[3] having used up its core hydrogen and expanded. At the age of around 1.26 billion years, it currently belongs to the so-called "red clump", which indicates it is on the horizontal branch and is generating energy through helium fusion at its core.[8] The star has an estimated 1.8[5] times the mass of the Sun and 8[4] times the Sun's radius. It is radiating 35[4] times the Sun's luminosity from its enlarged photosphere at an effective temperature of about 5,059 K.[5]


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, S2CID 18759600.
  2. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  3. Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
  4. 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.
  5. Feuillet, Diane K.; et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal, 817 (1): 40, arXiv:1511.04088, Bibcode:2016ApJ...817...40F, doi:10.3847/0004-637X/817/1/40, S2CID 118675933.
  6. "60 Ser". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-19.
  7. 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.
  8. Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv:astro-ph/0003329, Bibcode:2000ApJ...539..732A, doi:10.1086/309278, S2CID 16673121.


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