Nu Fornacis

A light curve for Nu Fornacis plotted from TESS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Fornax
Right ascension 02h 04m 29.43861s[2]
Declination −29° 17′ 48.5477″[2]
Apparent magnitude (V) 4.69[3] (4.68 – 4.73[4])
Characteristics
Spectral type B9.5IIIspSi[5]
U−B color index −0.51[3]
B−V color index −0.17[3]
Variable type α2 CVn[6]
Astrometry
Radial velocity (Rv)+18.50[7] km/s
Proper motion (μ) RA: +12.79[8] mas/yr
Dec.: +8.48[8] mas/yr
Parallax (π)8.79 ± 0.26 mas[2]
Distance370 ± 10 ly
(114 ± 3 pc)
Absolute magnitude (MV)−0.60[9]
Details
Mass3.65±0.18[10] M☉
Radius3.44[11] R☉
Luminosity245[10] L☉
Temperature13,400[12] K
Rotation1.89[12] d
Rotational velocity (v sin i)50±5[12] km/s
Other designations
ν For, CD−29°706, FK5 1055, GC 2506, HD 12767, HIP 9677, HR 612, SAO 167532[8]
Database references
SIMBADdata

Nu Fornacis, Latinized from ν Fornacis, is a single,[13] variable star in the southern constellation of Fornax. It is blue-white in hue and faintly visible to the naked eye with an apparent visual magnitude that fluctuates around 4.69.[3] This body is located approximately 370 light years distant from the Sun based on parallax,[2] and is drifting further away with a radial velocity of +18.5 km/s.[7] It is a candidate member of the Pisces-Eridanus stellar stream, which suggests an age of 120 million years or less.[14]

This object is an Ap star[15] with a stellar classification of B9.5IIIspSi[5] matching a late B-type giant star. The 'Si' suffix indicates an abundance anomaly of silicon. It is an Alpha2 Canum Venaticorum variable that ranges from magnitude 4.68 down to 4.73 with a period of 1.89 days – the same as its rotational period.[6][12] It is 3.65 times as massive and 245 times as luminous as the Sun,[10] with 3.44 times the Sun's diameter.[11]

References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. 1 2 3 4 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. Vizier catalog entry
  3. 1 2 3 4 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  4. ↑ Samus, N. N.; Durlevich, O. V.; et al. (2009). "General Catalogue of Variable Stars". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  5. 1 2 Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The relation between Rotational Velocities and Spectral Peculiarities among A-type stars". The Astrophysical Journal Supplement Series. 99: 135–172. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
  6. 1 2 Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
  7. 1 2 Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Washington. Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W. LCCN 54001336.
  8. 1 2 3 "* nu. For". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-04-08.
  9. ↑ 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.
  10. 1 2 3 North, P. (1998). "Do SI stars undergo any rotational braking?". Astronomy and Astrophysics. 334: 181–87. arXiv:astro-ph/9802286. Bibcode:1998A&A...334..181N.
  11. 1 2 Shulyak, D.; et al. (2014). "Interferometry of chemically peculiar stars: Theoretical predictions versus modern observing facilities". Monthly Notices of the Royal Astronomical Society. 443 (2): 1629. arXiv:1406.6093. Bibcode:2014MNRAS.443.1629S. doi:10.1093/mnras/stu1259.
  12. 1 2 3 4 Leone, F.; et al. (2000). "A spectroscopic study of the magnetic chemically peculiar star nu Fornacis". Astronomy and Astrophysics. 359: 635–38. Bibcode:2000A&A...359..635L.
  13. ↑ 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.
  14. ↑ Curtis, Jason L.; et al. (August 2019). "TESS Reveals that the Nearby Pisces─Eridanus Stellar Stream is only 120 Myr Old". The Astronomical Journal. 158 (2): 11. arXiv:1905.10588. Bibcode:2019AJ....158...77C. doi:10.3847/1538-3881/ab2899. S2CID 166228270. 77.
  15. ↑ Chen, P. S.; et al. (May 2017). "A New Photometric Study of Ap and Am Stars in the Infrared". The Astronomical Journal. 153 (5): 28. Bibcode:2017AJ....153..218C. doi:10.3847/1538-3881/aa679a. 218.
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