Nu Fornacis

Nu Fornacis, Latinized from ν Fornacis, is a single,[12] 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.[2] This body is located approximately 370 light years distant from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +18.5 km/s.[6] It is a candidate member of the Pisces-Eridanus stellar stream, which suggests an age of 120 million years or less.[13]

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

This object is an Ap star[14] with a stellar classification of B9.5IIIspSi[4] 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.[5][11] It is 3.65 times as massive and 245 times as luminous as the Sun,[9] with 3.44 times the Sun's diameter.[10]

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. Vizier catalog entry
  2. 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.
  3. 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.
  4. 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.
  5. Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S.
  6. Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Washington. Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W. LCCN 54001336.
  7. "* nu. For". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-04-08.
  8. 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.
  9. 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.
  10. 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.
  11. 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.
  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.
  13. 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. 77.
  14. 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.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.