Omikron Geminorum

	Omikron Geminorum (ο)
Observationsdata; Epok: J2000.0
Stjärnbild	Tvillingarna
Rektascension	07t 39m 09,93286s
Deklination	34° 35′ 03,6443″
Skenbar magnitud ()	4,90
Stjärntyp
Spektraltyp	F3 III
U–B	0,09
B–V	0,41
Astrometri
Radialhastighet ()	7,3 km/s
Egenrörelse (µ)	RA: -33,42 mas/år; Dek.: -118,17 mas/år
Avstånd	166 ± 3 lå (51,0 ± 0,8 pc)
Absolut magnitud ()	1,35
Detaljer
Radie	3,7 R☉
Luminositet	24 L☉
Temperatur	6 309 K
Metallicitet	0,12
Vinkelhastighet	91,1
Ålder	1 miljard år
Andra beteckningar
	ο Gem, 71 Geminorum, BD+34° 1649, FK5 2592, HD 61110, HIP 37265, HR 2930, SAO 60247.

Omikron Geminorum (ο Gem) är en ensam^[10] stjärna i stjärnbilden Tvillingarna. Det är svagt synlig för blotta ögat med en skenbar magnitud på 4,90.^[2] Baserat på en årlig parallaxförskjutning av 19,61 mas,^[1] befinner den sig på ett avstånd av 166 ljusår från solen.

Egenskaper[redigera | redigera wikitext]

Omikron Geminorum är en jättestjärna av F-typ^[8] med spektraltyp F3 III.^[3] Den uppmätta vinkeldiameter är 0,68 ± 0,03 mas,^[11] som vid dess beräknade avstånd ger en fysisk storlek av cirka 3,7 gånger solens radie.^[6] Dess utstrålning från den yttre atmosfären är cirka 24 gånger större än solens vid en effektiv temperatur av 6 309 K.^[7]

Källor[redigera | redigera wikitext]

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

Referenser[redigera | redigera wikitext]

^ [a b c d e] van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
^ [a b c d] Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data, SIMBAD, Bibcode:1986EgUBV........0M.
^ [a b] Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin, 51, Bibcode:1962RGOB...51...79E.
^ Wielen, R.; et al. (2000), "Sixth Catalogue of Fundamental Stars (FK6). Part III. Additional fundamental stars with direct solutions", Veröffentlichungen Astronomisches Rechen-Institut Heidelberg, Karlsruhe: Verlag G. Braun (37), pp. 1−308, Bibcode:2000VeARI..37....1W, ISBN 3-7650-0536-3.
^ [a b c] Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982Freely accessible, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191.
^ [a b] Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, "1" (3rd), Birkhäuser, ISBN 3-540-29692-1, https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41. . The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(51.0\cdot 0.68\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 7.46\cdot R_{\bigodot }\end{aligned}}$
^ [a b c] 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:1208.2037Freely accessible. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.
^ [a b] Schröder, C.; et al. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo", Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377.
^ "omi Gem -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, hämtad 2016-12-07.
^ 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:0806.2878Freely accessible, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.

[A-1] [a b c d e] van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.

[B-2] [a b c d] Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data, SIMBAD, Bibcode:1986EgUBV........0M.

[C-3] [a b] Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin, 51, Bibcode:1962RGOB...51...79E.

[4] Wielen, R.; et al. (2000), "Sixth Catalogue of Fundamental Stars (FK6). Part III. Additional fundamental stars with direct solutions", Veröffentlichungen Astronomisches Rechen-Institut Heidelberg, Karlsruhe: Verlag G. Braun (37), pp. 1−308, Bibcode:2000VeARI..37....1W, ISBN 3-7650-0536-3.

[D-5] [a b c] Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982Freely accessible, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191.

[E-6] [a b] Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, "1" (3rd), Birkhäuser, ISBN 3-540-29692-1, https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41. . The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(51.0\cdot 0.68\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 7.46\cdot R_{\bigodot }\end{aligned}}$

[F-7] [a b c] 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:1208.2037Freely accessible. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.

[G-8] [a b] Schröder, C.; et al. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo", Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377.

[9] "omi Gem -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, hämtad 2016-12-07.

[10] 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:0806.2878Freely accessible, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.

[11] Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.

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