Delta Fornacis

	Delta Fornacis (δ)
Observationsdata; Epok: J2000.0
Stjärnbild	Ugnen
Rektascension	03t 42m 14,90248s
Deklination	-31° 56′ 18,1055″
Skenbar magnitud ()	5,00
Stjärntyp
Spektraltyp	B5 III
U–B	-0,60
B–V	-0,16
Astrometri
Radialhastighet ()	26,00 km/s
Egenrörelse (µ)	RA: 4,80 mas/år; Dek.: 13,64 mas/år
Parallax ()	3,85 ± 0,25
Avstånd	850 ± 60 lå (260 ± 20 pc)
Absolut magnitud ()	-2,07
Detaljer
Massa	5,9 ± 0,2 M☉
Radie	6,0 R☉
Luminositet	1 291 L☉
Temperatur	16 230 ± 930 K
Vinkelhastighet	63,1 ± 16,1 km/s
Ålder	185 ± miljoner år
Andra beteckningar
	δ For, CD-32° 1430, FK5 133, HD 23227, HIP 17304, HR 1134, SAO 194467.

Delta Fornacis (δ Foracis, förkortat Delta For, δ For) som är stjärnans Bayerbeteckning, är en ensam stjärna^[12] belägen i den östra delen av stjärnbilden Ugnen. Den har en skenbar magnitud på 5,00^[2] och är synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 3,9^[1] mas, beräknas den befinna sig på ett avstånd på ca 850 ljusår (ca 260 parsek) från solen.

Egenskaper

Delta Fornacis är en blå till vit jättestjärna av spektralklass B5 III.^[3] Den har en massa som är ca 6^[6] gånger större än solens massa, en radie som likaledes är ca 6^[7] gånger större än solens och utsänder från dess fotosfär ca 1 300^[8] gånger mera energi än solen vid en effektiv temperatur av ca 16 200^[9] K.

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, tidigare version.

Noter

^ [a b c d e f] 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.
^ [a b c d] 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.
^ [a b] 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.
^ 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, arXiv:0705.0878, Bibcode:2007AN....328..889K, doi:10.1002/asna.200710776.
^ 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.
^ [a b c] 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, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x.
^ [a b] Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:: ${\begin{aligned}2\cdot R_{*}&={\frac {(259.7\cdot 0.215\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 12.0\cdot R_{\bigodot }\end{aligned}}$
^ [a b] McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
^ [a b] 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. arXiv:0903.5134. Bibcode:2009A&A...501..297Z. doi:10.1051/0004-6361/200811147.
^ Abt, Helmut A.; et al. (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
^ "del For -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, hämtad 2017-01-21.
^ 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.

Externa länkar

https://www.universeguide.com/star/deltafornacis

[A-1] [a b c d e f] 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.

[B-2] [a b c d] 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.

[C-3] [a b] 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] 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, arXiv:0705.0878, Bibcode:2007AN....328..889K, doi:10.1002/asna.200710776.

[5] 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.

[D-6] [a b c] 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, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x.

[E-7] [a b] Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:: ${\begin{aligned}2\cdot R_{*}&={\frac {(259.7\cdot 0.215\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 12.0\cdot R_{\bigodot }\end{aligned}}$

[F-8] [a b] McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.

[G-9] [a b] 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. arXiv:0903.5134. Bibcode:2009A&A...501..297Z. doi:10.1051/0004-6361/200811147.

[10] Abt, Helmut A.; et al. (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.

[11] "del For -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, hämtad 2017-01-21.

[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.

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