From Wikipedia, the free encyclopedia
Star in the constellation Serpens
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 ± 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 ± 0.017″position angle of ± 0.3°
[10]
References
^
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doi :
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S2CID
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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 :
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doi :
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S2CID
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a b c Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems",
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arXiv :
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doi :
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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 :
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Bibcode :
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doi :
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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 .
