HD 30479

	HD 30479
Observationsdata; Epok: J2000.0
Stjärnbild	Taffelberget
Rektascension	04t 38m 21,7254 s
Deklination	-77° 39′ 21,6185″
Skenbar magnitud ()	6,04 ± 0,01(v)
Stjärntyp
Spektraltyp	K2 III
U–B	+0,95
B–V	+1,10
Astrometri
Radialhastighet ()	+10,3 ± 0,1 km/s
Egenrörelse (µ)	RA: -6,975 mas/år; Dek.: -11,166 mas/år
Parallax ()	6,0377 ± 0,0223
Avstånd	540 ± 2 lå (165,6 ± 0,6 pc)
Absolut magnitud ()	+0,06
Detaljer
Massa	1,28 M☉
Radie	17,99 R☉
Luminositet	116 L☉
Temperatur	4 390 K
Metallicitet	-0,15 (Fe/H) dex
Vinkelhastighet	<1 km/s
Andra beteckningar
	13 G. Mensae, CPD-77 181, FK5 2350, GSC 09368-00084, HIC 21611, HIP 21611, HR 1531, IRAS 04405-7745, 2MASS J04382175-7739215, PPM 368483, SAO 256116, TYC 9368-84-1, uvby98 100030479, Gaia DR2 4624582332045559808, Gaia EDR3 4624582332045559808

HD 30479 ( eller HR 1531) är en ensam stjärna i den mellersta delen av stjärnbilden Taffelberget, som också har Bayer-beteckningen 13 G Mensae. Den har en skenbar magnitud av ca 6,04^[2] och är mycket svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 6,0^[1] mas, beräknas den befinna sig på ett avstånd på ca 540 ljusår (ca 166 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 10 km/s.^[5]

Egenskaper redigera

HD 30479 är en orange till gul jättestjärna av spektralklass K2 III.^[1] Den har en massa som är ca 1,3^[7] solmassor, en radie som, baserat på en uppmätt vinkeldiameter av 1,01 ± 0,07 mas,^[10] kompenserad för randfördunkling, är ca 18^[8] solradier och har ca 116 gånger solens utstrålning av energi^[9] från dess fotosfär vid en effektiv temperatur av ca 4 400 K.^[10]

Referenser redigera

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, HD 30479, 27 mars 2022.

Noter redigera

^ [a b c d e f g] Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
^ [a b] Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
^ Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.
^ [a b] Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
^ [a b] 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.
^ https://www.universeguide.com/star/21611/hd30479. Hämtad 2022-04-10.
^ [a b] Anders, F.; et al. (1 August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. S2CID 131780028.
^ [a b] Lang, Kenneth R. (2006). Astrophysical formulae. Astronomy and astrophysics library. Vol. 1 (3 ed.). Birkhäuser. ISBN 3-540-29692-1. The radius (R*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(165.6\cdot 1.01\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 35.98\cdot R_{\bigodot }\end{aligned}}$
^ [a b] McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433.
^ [a b c] Lafrasse, Sylvain; Mella, Guillaume; Bonneau, Daniel; Duvert, Gilles; Delfosse, Xavier; Chesneau, Olivier; Chelli, Alain (16 July 2010). "Building the 'JMMC Stellar Diameters Catalog' using SearchCal". Optical and Infrared Interferometry II. Vol. 7734. pp. 77344E. arXiv:1009.0137. Bibcode:2010SPIE.7734E..4EL. doi:10.1117/12.857024. S2CID 32097037.
^ Eggen, O. J. (February 1994). "Evolved GK stars near the Sun. 2: The young disk population". The Astronomical Journal. 107: 594. Bibcode:1994AJ....107..594E. doi:10.1086/116879. ISSN 0004-6256.
^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361.
^ HR 1531 (u-strasbg.fr)|Hämtad 2022-04-10.

Externa länkar redigera

https://www.universeguide.com/star/21611/hd30479.

[A-1] [a b c d e f g] Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.

[B-2] [a b] Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.

[C-3] Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.

[D-4] [a b] Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.

[E-5] [a b] 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.

[UG-6] ttps://www.universeguide.com/star/21611/hd30479. Hämtad 2022-04-10.

[F-7] [a b] Anders, F.; et al. (1 August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. S2CID 131780028.

[G-8] [a b] Lang, Kenneth R. (2006). Astrophysical formulae. Astronomy and astrophysics library. Vol. 1 (3 ed.). Birkhäuser. ISBN 3-540-29692-1. The radius (R*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(165.6\cdot 1.01\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 35.98\cdot R_{\bigodot }\end{aligned}}$

[H-9] [a b] McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433.

[I-10] [a b c] Lafrasse, Sylvain; Mella, Guillaume; Bonneau, Daniel; Duvert, Gilles; Delfosse, Xavier; Chesneau, Olivier; Chelli, Alain (16 July 2010). "Building the 'JMMC Stellar Diameters Catalog' using SearchCal". Optical and Infrared Interferometry II. Vol. 7734. pp. 77344E. arXiv:1009.0137. Bibcode:2010SPIE.7734E..4EL. doi:10.1117/12.857024. S2CID 32097037.

[J-11] Eggen, O. J. (February 1994). "Evolved GK stars near the Sun. 2: The young disk population". The Astronomical Journal. 107: 594. Bibcode:1994AJ....107..594E. doi:10.1086/116879. ISSN 0004-6256.

[K-12] De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361.

[SIMBAD-13] HR 1531 (u-strasbg.fr)|Hämtad 2022-04-10.

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Observationsdata Epok: J2000.0
HD 30479

Stjärnbild	Taffelberget
Rektascension	04^t 38^m 21,7254 ^s^[1]
Deklination	-77° 39′ 21,6185″^[1]
Skenbar magnitud ( $V$ )	6,04 ± 0,01(v)^[2]
Stjärntyp
Spektraltyp	K2 III^[3]
U–B	+0,95^[4]
B–V	+1,10^[4]
Astrometri
Radialhastighet ( $R_{v}$ )	+10,3 ± 0,1^[5] km/s
Egenrörelse (µ)	RA: -6,975^[1] mas/år Dek.: -11,166^[1] mas/år
Parallax ( $\pi$ )	6,0377 ± 0,0223^[1]
Avstånd	540 ± 2 lå (165,6 ± 0,6 pc)
Absolut magnitud ( $M_{V}$ )	+0,06^[6]
Detaljer
Massa	1,28^[7] M_☉
Radie	17,99^[8] R_☉
Luminositet	116^[9] L_☉
Temperatur	4 390^[10] K
Metallicitet	-0,15 (Fe/H)^[11] dex
Vinkelhastighet	<1^[12] km/s
Andra beteckningar
13 G. Mensae, CPD-77 181, FK5 2350, GSC 09368-00084, HIC 21611, HIP 21611, HR 1531, IRAS 04405-7745, 2MASS J04382175-7739215, PPM 368483, SAO 256116, TYC 9368-84-1, uvby98 100030479, Gaia DR2 4624582332045559808, Gaia EDR3 4624582332045559808 ^[13]