60 Serpentis

60 Serpentis
Observation data; Epoch J2000 Equinox ICRS
Constellation	Serpens
Right ascension	18h 29m 40.97948s
Declination	−01° 59′ 07.1058″
Apparent magnitude (V)	5.38
Characteristics
Evolutionary stage	red clump
Spectral type	K0 III
B−V color index	0.961±0.004
Astrometry
Radial velocity (Rv)	+28.36±0.34 km/s
Proper motion (μ)	RA: −85.35 mas/yr ; Dec.: −34.31 mas/yr
Parallax (π)	25.16±0.31 mas
Distance	130 ± 2 ly ; (39.7 ± 0.5 pc)
Absolute magnitude (MV)	1.25±0.07
Details
Mass	1.81±0.49 M☉
Radius	8 R☉
Luminosity	35 L☉
Surface gravity (log g)	2.92±0.11 cgs
Temperature	5,059±92 K
Metallicity [Fe/H]	−0.08 dex
Rotational velocity (v sin i)	3.9 km/s
Age	1.26+0.19; −0.16 Gyr
Other designations
	c Ser, 60 Ser, BD−02°4641, FK5 1480, HD 170474, HIP 90642, HR 6935, SAO 142348
Database references
SIMBAD	data

60 Serpentis, also known as c Serpentis, is a single, 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. The distance to this star, as estimated from its annual parallax shift of 25.16±0.31 mas, is approximately 130 light years. It is moving further from the Sun with a heliocentric radial velocity of +28 km/s, having approached as close as 107 ly (32.7 pc) some 1.9 million years ago.

This is an evolved K-type giant star with a stellar classification of K0 III, 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. The star has an estimated 1.8 times the mass of the Sun and 8 times the Sun's radius. It is radiating 35 times the Sun's luminosity from its enlarged photosphere at an effective temperature of about 5,059 K.

References

1 2 3 4 5 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.
1 2 3 4 5 6 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.
↑ Gontcharov, G. A. (2009). "Red giant clump in the Tycho-2 catalogue". Astronomy Letters. 34 (11): 785–796. arXiv:1607.00619. Bibcode:2008AstL...34..785G. doi:10.1134/S1063773708110078. S2CID 73524157.
1 2 Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
1 2 3 4 5 6 7 8 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.
1 2 3 4 5 6 7 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.
↑ "60 Ser". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-19.
↑ 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.
↑ 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.

[Anderson2012-1] 1 2 3 4 5 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.

[vanLeeuwen2007-2] 1 2 3 4 5 6 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.

[gontcharov2008-3] Gontcharov, G. A. (2009). "Red giant clump in the Tycho-2 catalogue". Astronomy Letters. 34 (11): 785–796. arXiv:1607.00619. Bibcode:2008AstL...34..785G. doi:10.1134/S1063773708110078. S2CID 73524157.

[Houk1999-4] 1 2 Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.

[Massarotti2008-5] 1 2 3 4 5 6 7 8 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.

[Feuillet2016-6] 1 2 3 4 5 6 7 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.

[SIMBAD-7] "60 Ser". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-19.

[Eggleton2008-8] 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.

[Alves2000-9] 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.