Nu Cassiopeiae

Nu Cassiopeiae,[11] Latinized from ν Cassiopeiae, is a solitary[12] star in the northern constellation of Cassiopeia. With an apparent visual magnitude of +4.89,[2] it is a faint star but visible to the naked eye. Based upon an annual parallax shift of 7.92 mas as seen from Earth,[1] this star is located around 410 light years from the Sun. Cowley et al. (1969) catalogued this star with a stellar classification of B9 III,[3] indicating it has the spectrum of an evolved B-type giant star. However, Palmer et al. (1968) assigned it a class of B8 V, which would instead suggest it is an ordinary B-type main-sequence star.[4]

Nu Cassiopeiae

Map of the Bayer-designated stars in Cassiopeia. Nu Cassiopeiae is circled.
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cassiopeia
Right ascension 00h 43m 28.07045s[1]
Declination +47° 01′ 28.3694″[1]
Apparent magnitude (V) +4.89[2]
Characteristics
Spectral type B9 III[3] or B8 V[4]
U−B color index −0.43[5]
B−V color index −0.11[5]
Astrometry
Radial velocity (Rv)+9.0±4.2[6] km/s
Proper motion (μ) RA: +30.84±0.22[1] mas/yr
Dec.: −10.02±0.18[1] mas/yr
Parallax (π)7.92 ± 0.32[1] mas
Distance410 ± 20 ly
(126 ± 5 pc)
Absolute magnitude (MV)−0.60[7]
Details
Mass3.90±0.07[8] M☉
Luminosity348[8] L☉
Surface gravity (log g)4.026±0.035[9] cgs
Temperature13,268±150[9] K
Rotational velocity (v sin i)134±17[9] km/s
Other designations
ν Cas, 25 Cas, BD+50° 147, HD 4636, HIP 3801, HR 223, SAO 21729[10]
Database references
SIMBADdata
ν Cassiopeiae in optical light

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. Häggkvist, L.; Oja, T. (1966), "Photoelectric photometry of bright stars", Arkiv för Astronomi, 4: 137–163, Bibcode:1966ArA.....4..137H.
  3. Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819
  4. Palmer, D. R.; et al. (1968), "The radial velocities spectral types and projected rotational velocities of 633 bright northern A stars", Royal Observatory Bulletin, 135: 385, Bibcode:1968RGOB..135..385P.
  5. Crawford, D. L. (February 1963), "U, b, v, and Hβ Photometry for the Bright B8- and B9-TYPE Stars", Astrophysical Journal, 137: 530, Bibcode:1963ApJ...137..530C, doi:10.1086/147526.
  6. 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, A61.
  7. 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.
  8. Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691.
  9. Huang, Wenjin; et al. (October 2010), "A Stellar Rotation Census of B Stars: From ZAMS to TAMS", The Astrophysical Journal, 722 (1): 605–619, arXiv:1008.1761, Bibcode:2010ApJ...722..605H, doi:10.1088/0004-637X/722/1/605.
  10. "nu. Cas". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-30.
  11. Not to be confused with NU Cassiopeiae, an eclipsing binary of the Beta Lyrae type.
  12. 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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