HD 44594

	HD 44594
Observationsdata; Epok: J2000.0
Stjärnbild	Akterskeppet
Rektascension	06t 20m 06,13530s
Deklination	-48° 44′ 27,9344″
Skenbar magnitud ()	+6,64 (V)
Stjärntyp
Spektraltyp	G1.5 V
U–B	+0,20
B–V	+0,66
Astrometri
Radialhastighet ()	+59,1 km/s
Egenrörelse (µ)	RA: +234,60 mas/år; Dek.: -267,31 mas/år
Parallax ()	39,79 ± 0,34
Avstånd	82,0 ± 0,7 lå (25,1 ± 0,2 pc)
Absolut magnitud ()	4,56
Detaljer
Massa	1,08 M☉
Radie	1,0 R☉
Temperatur	5 840 K
Metallicitet	+0,15(Fe/H) dex
Vinkelhastighet	4,4 km/s
Ålder	4,1 miljarder år
Andra beteckningar
	CD-48 2259, CPD-48 833, FK5 2486, HIC 30104, HIP 30104, HR 2290, IRAS 06187-4842, NLTT 16414, PLX 1477, PPM 310646, SAO 217861, TD1 6911, uvby98 100044594, Gaia DR1 5553647078872137088

HD 44594 är en ensam stjärna, belägen i den södra delen av stjärnbilden Akterskeppet. Den har en skenbar magnitud av ca 6,64^[2] och kräver åtminstone en handkikare för att kunna observeras. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 39,8^[1] mas, beräknas den befinna sig på ett avstånd på ca 82 ljusår (ca 25 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 59 km/s.^[4]

Egenskaper[redigera | redigera wikitext]

HD 44594 är en gul^[10] till vit stjärna i huvudserien av spektralklass G1.5 V.^[3] vilket betyder att den genererar energi genom termonukleär fusion av väte i dess kärna. Den har en massa och en radie som är ungefär lika med solens^[5]^[6] och en energiavgivning som är mycket lik solens vid en effektiv temperatur av ca 5 800.^[7] K Den betraktas därför som en solliknande stjärna.^[11] Överskottet av andra element än väte eller helium, vad astronomer kallar stjärnans metallicitet, är dock 41 procent högre än i solen.^[12]

Referenser[redigera | redigera wikitext]

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, HD 44594, 14 maj 2020.

Noter[redigera | redigera wikitext]

^ [a b c d e f] van Leeuwen, F. (November 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] Przybylski, A.; Kennedy, P. M. (1965), "Radial velocities and three-colour photometry of 166 southern stars", Monthly Notices of the Royal Astronomical Society, 131: 95–104, Bibcode:1965MNRAS.131...95P, doi:10.1093/mnras/131.1.95
^ [a b] Gray, R. O.; et al. (October 2003), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I.", The Astronomical Journal, 126 (4): 2048–2059, arXiv:astro-ph/0308182, Bibcode:2003AJ....126.2048G, doi:10.1086/378365
^ [a b c] Nordström, B.; et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics, 418 (3): 989–1019, arXiv:astro-ph/0405198, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959
^ [a b c] Sousa, S. G.; Fernandes, J.; Israelian, G.; Santos, N. C. (March 2010), "Higher depletion of lithium in planet host stars: no age and mass effect", Astronomy and Astrophysics, 512: L5, arXiv:1003.0405, Bibcode:2010A&A...512L...5S, doi:10.1051/0004-6361/201014125
^ [a b] Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics, 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451
^ [a b c] Sousa, S. G.; et al. (August 2008), "Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes", Astronomy and Astrophysics, 487 (1): 373–381, arXiv:0805.4826, Bibcode:2008A&A...487..373S, doi:10.1051/0004-6361:200809698
^ Schröder, C.; Reiners, A.; Schmitt, J. H. M. M. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo" (PDF), Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377
^ "LTT 2525 – High proper-motion Star", SIMBAD, Centre de Données astronomiques de Strasbourg, hämtad 2020-05-14.
^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 10, 2012, hämtad 2012-01-16
^ Hardorp, J.; Tueg, H.; Schmidt-Kaler, T. (March 1982), "The sun among the stars. VI – The solar analog HD 44594", Astronomy and Astrophysics, 107 (2): 311–312, Bibcode:1982A&A...107..311H
^ For a metallicity of [Fe/H] = +0,15 dex, the proportion of heavier elements relative to the abundance in the Sun is given by: 10^+0,15 = 1,4.

[A-1] [a b c d e f] van Leeuwen, F. (November 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] Przybylski, A.; Kennedy, P. M. (1965), "Radial velocities and three-colour photometry of 166 southern stars", Monthly Notices of the Royal Astronomical Society, 131: 95–104, Bibcode:1965MNRAS.131...95P, doi:10.1093/mnras/131.1.95

[C-3] [a b] Gray, R. O.; et al. (October 2003), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I.", The Astronomical Journal, 126 (4): 2048–2059, arXiv:astro-ph/0308182, Bibcode:2003AJ....126.2048G, doi:10.1086/378365

[D-4] [a b c] Nordström, B.; et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics, 418 (3): 989–1019, arXiv:astro-ph/0405198, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959

[E-5] [a b c] Sousa, S. G.; Fernandes, J.; Israelian, G.; Santos, N. C. (March 2010), "Higher depletion of lithium in planet host stars: no age and mass effect", Astronomy and Astrophysics, 512: L5, arXiv:1003.0405, Bibcode:2010A&A...512L...5S, doi:10.1051/0004-6361/201014125

[F-6] [a b] Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics, 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451

[G-7] [a b c] Sousa, S. G.; et al. (August 2008), "Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes", Astronomy and Astrophysics, 487 (1): 373–381, arXiv:0805.4826, Bibcode:2008A&A...487..373S, doi:10.1051/0004-6361:200809698

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

[I-9] "LTT 2525 – High proper-motion Star", SIMBAD, Centre de Données astronomiques de Strasbourg, hämtad 2020-05-14.

[K-10] "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 10, 2012, hämtad 2012-01-16

[J-11] Hardorp, J.; Tueg, H.; Schmidt-Kaler, T. (March 1982), "The sun among the stars. VI – The solar analog HD 44594", Astronomy and Astrophysics, 107 (2): 311–312, Bibcode:1982A&A...107..311H

[L-12] For a metallicity of [Fe/H] = +0,15 dex, the proportion of heavier elements relative to the abundance in the Sun is given by: 10^+0,15 = 1,4.

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Observationsdata Epok: J2000.0
HD 44594

Stjärnbild	Akterskeppet
Rektascension	06^t 20^m 06,13530^s^[1]
Deklination	-48° 44′ 27,9344″^[1]
Skenbar magnitud ( $V$ )	+6,64 (V)^[2]
Stjärntyp
Spektraltyp	G1.5 V^[3]
U–B	+0,20^[2]
B–V	+0,66^[2]
Astrometri
Radialhastighet ( $R_{v}$ )	+59,1^[4] km/s
Egenrörelse (µ)	RA: +234,60^[1] mas/år Dek.: -267,31^[1] mas/år
Parallax ( $\pi$ )	39,79 ± 0,34^[1]
Avstånd	82,0 ± 0,7 lå (25,1 ± 0,2 pc)
Absolut magnitud ( $M_{V}$ )	4,56^[4]
Detaljer
Massa	1,08^[5] M_☉
Radie	1,0^[6] R_☉
Temperatur	5 840^[7] K
Metallicitet	+0,15(Fe/H)^[7] dex
Vinkelhastighet	4,4^[8] km/s
Ålder	4,1^[5] miljarder år
Andra beteckningar
CD-48 2259, CPD-48 833, FK5 2486, HIC 30104, HIP 30104, HR 2290, IRAS 06187-4842, NLTT 16414, PLX 1477, PPM 310646, SAO 217861, TD1 6911, uvby98 100044594, Gaia DR1 5553647078872137088 ^[9]