Star in the constellation Serpens
6 Serpentis Observation data Epoch J2000 Equinox J2000 |
Constellation | Serpens |
Right ascension | 15h 21m 01.99609s[1] |
Declination | +00° 42′ 55.2213″[1] |
Apparent magnitude (V) | 5.382[2] (5.54 + 9.42)[3] |
Characteristics |
Spectral type | K3 III[2] |
B−V color index | 1.224[2] |
Astrometry |
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Radial velocity (Rv) | +9.7±0.3[4] km/s |
Proper motion (μ) | RA: −42.36[1] mas/yr Dec.: −103.14[1] mas/yr |
Parallax (π) | 13.63 ± 0.73 mas[1] |
Distance | 240 ± 10 ly (73 ± 4 pc) |
Absolute magnitude (MV) | 1.03[5] |
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Details[2] |
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6 Ser A |
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Mass | 1.27 M☉ |
Radius | 12[6] R☉ |
Luminosity | 55 L☉ |
Surface gravity (log g) | 2.4[6] cgs |
Temperature | 4,417±17 K |
Metallicity [Fe/H] | −0.02[7] dex |
Rotational velocity (v sin i) | 2.4[6] km/s |
Age | 6.03 Gyr |
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Other designations |
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Database references |
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SIMBAD | data |
6 Serpentis is a binary star[3] system in the constellation Serpens. It has a combined apparent visual magnitude of 5.382,[2] which is bright enough to be faintly visible to the naked eye. The distance to this system, based upon an annual parallax shift of 13.63±0.73 mas,[1] is about 240 light years. It is moving further from the Sun with a heliocentric radial velocity of +10 km/s.[4]
The primary, component A, is an evolved red giant of spectral type K3III,[2] a star that has used up its core hydrogen and has expanded. At the age of around six billion years it is a red clump star,[7][9] indicating it is on the horizontal branch and is generating energy through helium fusion at its core. The star has 1.27[2] times the mass of the Sun and has expanded to 12[6] times the Sun's radius. It is radiating 55[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,417 K.[2]
As of 2005, the magnitude 9.42[3] secondary, component B, was at an angular separation of 3.329″±0.017″ along a position angle of 21.8°±0.3°.[10]
References
- ^ a b c d e f 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 e f g h i Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 23, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114, 88.
- ^ a b c 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.
- ^ a b de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ 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.
- ^ a b c d 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.
- ^ a b Laney, C. D.; et al. (2012), "A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars", Monthly Notices of the Royal Astronomical Society, 419 (2): 1637, arXiv:1109.4800, Bibcode:2012MNRAS.419.1637L, doi:10.1111/j.1365-2966.2011.19826.x, S2CID 117788450.
- ^ "6 Ser". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-19.
- ^ 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.
- ^ Scardia, M.; et al. (January 2007), "Speckle observations with PISCO in Merate - III. Astrometric measurements of visual binaries in 2005 and scale calibration with a grating mask", Monthly Notices of the Royal Astronomical Society, 374 (3): 965–978, Bibcode:2007MNRAS.374..965S, doi:10.1111/j.1365-2966.2006.11206.x.
Constellation of Serpens
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Stars | Bayer | |
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Flamsteed | |
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Variable | - R
- W
- X
- RT
- UZ
- VV
- VY
- WX
- AA
- AN
- AO
- AP
- AR
- AU
- BQ
- CT
- CV
- CW
- EG
- FH
- FI
- FK
- FL
- FQ
- FR
- LV
- LW
- LX
- MR
- MS
- MT
- MV
- MY
- NN
- NO
- NQ
- NW
- OO
- OU
- PS
- QV
- QX
- QY
- V382
- V411
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HR | - 5665
- 5690
- 5692
- 5706
- 5711
- 5740
- 5745
- 5783
- 5796
- 5831
- 5850
- 5859
- 5861
- 5874
- 5909
- 5913
- 5931
- 5992
- 6005
- 6011
- 6014
- 6016
- 6449
- 6496
- 6544
- 6562
- 6568
- 6600
- 6620
- 6666
- 6681
- 6755
- 6756
- 6757
- 6785
- 6830
- 6840
- 6843
- 6858
- 6890
- 6898
- 6928
- 6993 (e)
- 6999
- 7008
- 7048
- 7076
- 7144
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