Jump to content

Nu3 Canis Majoris

From Wikipedia, the free encyclopedia
Nu3 Canis Majoris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Canis Major[1]
Right ascension 06h 37m 53.421s[2]
Declination −18° 14′ 14.93″[2]
Apparent magnitude (V) 4.41[3] (4.63 + 8.56)[4]
Characteristics
Evolutionary stage horizontal branch[5]
Spectral type K0 II-III[6]
U−B color index +1.04[3]
B−V color index +1.16[3]
Astrometry
Radial velocity (Rv)−1.50±0.70[7] km/s
Proper motion (μ) RA: −7.166 mas/yr[2]
Dec.: −8.777 mas/yr[2]
Parallax (π)6.7876±0.1054 mas[2]
Distance481 ± 7 ly
(147 ± 2 pc)
Absolute magnitude (MV)−1.13[1]
Details[6]
ν3 CMa A
Mass3.38±0.37[5] M
Radius32.7 R
Luminosity398 L
Surface gravity (log g)2.34 cgs
Temperature4,510 K
Metallicity [Fe/H]−0.24 dex
Rotation183 d
Rotational velocity (v sin i)8[8] km/s
Age380±20[5] Myr
Other designations
HDS 915, ν3 CMa, 8 Canis Majoris, BD−18°1492, GC 8660, HD 47442, HIP 31700, HR 2443, SAO 151730, CCDM 06379-1814, WDS J06379-1814A[9]
Database references
SIMBADdata

Nu3 Canis Majoris is a binary star[4] system in the southern constellation of Canis Major. Its name is a Bayer designation that is Latinized from ν3 Canis Majoris, and abbreviated Nu3 CMa or ν3 CMa. The star system, appearing as one star, is deemed visible to the naked eye with its combined apparent visual magnitude of 4.41.[3] Based upon an annual parallax shift of 6.79 mas as seen from Earth,[2] this system is approximately 481 light-years (147 pc) distant from the Sun.

Characteristics

[edit]

The primary member, component A, is an evolved, orange-hued giant/bright giant hybrid with an apparent magnitude of +4.63[4] and a stellar classification of K0 II-III.[6] It is most likely (96% chance) on the horizontal branch,[5] which would indicate it is generated energy through helium fusion at its core. The star has a moderate level of surface activity with a magnetic field strength of 2.2±0.4 G and is a source of X-ray emission with a luminosity of 624×1027 erg s−1.[6]

This giant has an estimated 3.4[5] times the mass of the Sun and has expanded to 33[6] times the Sun's radius. It is radiating 398 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,510 K.[6] The star is spinning with the leisurely period of 183 days.[6] Its companion, component B has been observed at 1.040 arcseconds distant along a position angle of 2.9° as of 2002,[10] and has an apparent magnitude of +8.56.[4]

References

[edit]
  1. ^ a b 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. XHIP record for this object at VizieR.
  2. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ a b c d Fernie, J. D. (May 1983), "New UBVRI photometry for 900 supergiants", Astrophysical Journal Supplement Series, 52: 7–22, Bibcode:1983ApJS...52....7F, doi:10.1086/190856.
  4. ^ a b c d 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.
  5. ^ a b c d e Reffert, Sabine; et al. (2015), "Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity", Astronomy & Astrophysics, 574: A116, arXiv:1412.4634, Bibcode:2015A&A...574A.116R, doi:10.1051/0004-6361/201322360, hdl:10722/215277, S2CID 59334290.
  6. ^ a b c d e f g Aurière, M.; et al. (2015), "The magnetic fields at the surface of active single G-K giants", Astronomy & Astrophysics, 574: A90, arXiv:1411.6230, Bibcode:2015A&A...574A..90A, doi:10.1051/0004-6361/201424579, S2CID 118504829, A90.
  7. ^ 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.
  8. ^ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1), Bibcode:1970CoAsi.239....1B.
  9. ^ "nu03 CMa", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-09-05.
  10. ^ Roberts, Lewis C. Jr.; et al. (November 2005), "Adaptive Optics Photometry and Astrometry of Binary Stars", The Astronomical Journal, 130 (5): 2262–2271, Bibcode:2005AJ....130.2262R, doi:10.1086/491586.