Astronomy:Delta Fornacis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Fornax |
| Right ascension | 03h 42m 14.90238s[1] |
| Declination | −31° 56′ 18.0961″[1] |
| Apparent magnitude (V) | 5.00[2] |
| Characteristics | |
| Spectral type | B5 III[3] |
| U−B color index | −0.60[2] |
| B−V color index | −0.16[2] |
| Astrometry | |
| Radial velocity (Rv) | +26.00[4] km/s |
| Proper motion (μ) | RA: +4.942[1] mas/yr Dec.: +13.326[1] mas/yr |
| Parallax (π) | 4.1125 ± 0.2114[1] mas |
| Distance | 790 ± 40 ly (240 ± 10 pc) |
| Absolute magnitude (MV) | −2.07[5] |
| Details | |
| Mass | 5.9±0.2[6] M☉ |
| Radius | 6.0[7] R☉ |
| Luminosity | 1,291[8] L☉ |
| Temperature | 16,230±930[9] K |
| Rotational velocity (v sin i) | 185[10] km/s |
| Age | 63.1±16.1[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Delta Fornacis, Latinized from δ Fornacis, is a solitary,[12] blue-white hued star near the middle of the southern constellation of Fornax. With an apparent visual magnitude of 5.00,[2] it is faintly visible to the naked eye at night. The star has an annual parallax shift of 4.1 mas,[1] indicating it lies at a distance of approximately 790 light years from the Sun. It is drifting further away with a radial velocity of +26 km/s.[4]
The stellar classification of Delta Fornacis is B5 III,[3] matching an evolved B-type giant star. It has an angular diameter of 0.215±0.015 mas,[9] which, at the estimated distance of the star, yields a physical size of around 6 times the radius of the Sun.[7] Around 63 million years old,[6] the star is spinning rapidly with a projected rotational velocity of 185 km/s.[10] It has an estimated 5.9[6] times the Sun's mass and radiates 1,291[8] times the solar luminosity from its outer atmosphere at an effective temperature of 16,230 K.[9]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1999), "UBVRIJKL photometry of the bright stars", Commission Lunar and Planetary Laboratory 4: 99, Bibcode: 1966CoLPL...4...99J.
- ↑ 3.0 3.1 Houk, N. (1982), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1982mcts.book.....H.
- ↑ 4.0 4.1 Kharchenko, N. V. et al. (2007), "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations", Astronomische Nachrichten 328 (9): 889, doi:10.1002/asna.200710776, Bibcode: 2007AN....328..889K.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 6.0 6.1 6.2 6.3 Tetzlaff, N. et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1): 190–200, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T.
- ↑ 7.0 7.1 Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1, https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41. The radius (R*) is given by:
- [math]\displaystyle{ \begin{align} 2\cdot R_* & = \frac{(259.7\cdot 0.215\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\ & \approx 12.0\cdot R_{\bigodot} \end{align} }[/math]
- ↑ 8.0 8.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ 9.0 9.1 9.2 Zorec, J. et al. (2009), "Fundamental parameters of B supergiants from the BCD system. I. Calibration of the (λ_1, D) parameters into Teff", Astronomy and Astrophysics 501 (1): 297–320, doi:10.1051/0004-6361/200811147, Bibcode: 2009A&A...501..297Z.
- ↑ 10.0 10.1 Abt, Helmut A. et al. (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal 573 (1): 359–365, doi:10.1086/340590, Bibcode: 2002ApJ...573..359A.
- ↑ "del For". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=del+For.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
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