Phi Fornacis

Phi Fornacis is a single[9] star in the southern constellation of Fornax. It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 5.13.[2] The distance to this object is approximately 154 light years based on parallax,[1] and it is drifting further away with a radial velocity of +19 km/s.[4]

Phi Fornacis
Observation data
Epoch J2000      Equinox J2000
Constellation Fornax
Right ascension  02h 28m 01.70348s[1]
Declination −33° 48′ 39.7382″[1]
Apparent magnitude (V) 5.13[2]
Characteristics
Spectral type A2.5V[3]
B−V color index +0.089±0.003[2]
Astrometry
Radial velocity (Rv)+19.0±4.2[4] km/s
Proper motion (μ) RA: +18.526[1] mas/yr
Dec.: +5.163[1] mas/yr
Parallax (π)21.1604 ± 0.1410[1] mas
Distance154 ± 1 ly
(47.3 ± 0.3 pc)
Absolute magnitude (MV)1.79[2]
Details
Mass2.11[5] M☉
Radius1.74[6] R☉
Luminosity16.66[2] L☉
Surface gravity (log g)4.27[5] cgs
Temperature9,449±321[5] K
Rotational velocity (v sin i)116.8±0.8[7] km/s
Age238[5] Myr
Other designations
φ For, CD−34°905, FK5 2168, GC 2967, HD 15427, HIP 11477, HR 724, SAO 193723[8]
Database references
SIMBADdata

This is an A-type main-sequence star with a stellar classification of A2.5V.[3] Phi Fornacis is 238[5] million years old and is spinning with a projected rotational velocity of 117 km/s.[7] It has 2.1[5] times the mass of the Sun and 1.7[6] times the Sun's radius. The star is radiating 17[2] times the luminosity of the Sun from its photosphere at an effective temperature of 9,449 km/s.[5] It displays an infrared excess, suggesting a circumstellar disk[10] of dust is orbiting the star at a distance of 30.2 AU with a mean temperature of 100 K.[6]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. 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.
  3. 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
  4. Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  5. David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
  6. Cotten, Tara H.; Song, Inseok (July 2016), "A Comprehensive Census of Nearby Infrared Excess Stars", The Astrophysical Journal Supplement Series, 225 (1): 24, arXiv:1606.01134, Bibcode:2016ApJS..225...15C, doi:10.3847/0067-0049/225/1/15, 15.
  7. Díaz, C. G.; et al. (July 2011), "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum", Astronomy & Astrophysics, 531: A143, arXiv:1012.4858, Bibcode:2011A&A...531A.143D, doi:10.1051/0004-6361/201016386.
  8. "* phi For". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-04-06.
  9. 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.
  10. Chen, Christine H.; et al. (2014), "The Spitzer Infrared Spectrograph Debris Disk Catalog. I. Continuum Analysis of Unresolved Targets", The Astrophysical Journal Supplement, 211 (2): 22, Bibcode:2014ApJS..211...25C, doi:10.1088/0067-0049/211/2/25, 25.
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