AH Velorum

	AH Velorum
Observationsdata; Epok: J2000.0
Stjärnbild	Seglet
Rektascension	08t 11m 59,96702s
Deklination	-46° 38′ 39,6561″
Skenbar magnitud ()	5,70 (5,50-5,89)
Stjärntyp
Spektraltyp	F7 Ib-II
B–V	+0,59
Variabeltyp	Klassisk cepheid
Astrometri
Radialhastighet ()	+26,0 ± 2,9 km/s
Egenrörelse (µ)	RA: -4,405 mas/år; Dek.: +6,768 ± 0,060 mas/år
Parallax ()	1,2170 ± 0,0570
Avstånd	2 700 ± 100 lå (820 ± 40 pc)
Absolut magnitud ()	-2,52
Detaljer
Massa	7,0 ± 0,5 M☉
Luminositet	929,98 L☉
Temperatur	6 102 K
Metallicitet	+0,09
Vinkelhastighet	10,0 ± 0,5 km/s
Ålder	50,0 ± 11,0 miljoner år
Andra beteckningar
	HD 68808, CD-46 3902, CPD-46 2254, GSC 08136-01166, HIC 40155, HIP 40155, HR 3232, IRAS 08104-4629, 2MASS J08115997-4638397, PPM 312739, SAO 219587, TYC 8136-1166-1, uvby98 100068808, AH Velorum, Gaia DR3 5519380081746387328, Gaia DR1 5519380077440172672, Gaia DR2 5519380077440172672

AH Velorum eller HD 68808, är en ensam stjärna belägen i den mellersta delen av stjärnbilden Seglet.^[12] Den har en genomsnittlig skenbar magnitud av ca 5,70^[2] och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 1,22 mas,^[1] beräknas den befinna sig på ett avstånd på ca 2 700 ljusår (820 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 26 km/s.^[6]

Egenskaper

AH Velorum är en gul till vit ljusstark jättestjärna eller superjätte av spektralklass F7 Ib-II.^[13] Den har en massa som är ca 7^[8] solmassor och utsänder från dess fotosfär energi motsvarande 930^[7] gånger solen vid en effektiv temperatur av ca 6 100 K.^[5]

AH Velorum är en Klassisk cepheidvariabel,^[3] vars skenbara magnitud varierar från 5,50 till 5,89 med en period av 4,227171 dygn.^[13] Den pulserar i första övertonen, med en fundamental period på 6,04 dygn.^[2]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, AH Velorum, 1 december 2023.

Noter

^ [a b c d e f] 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.
^ [a b c] Evans, Nancy Remage; Bond, Howard E; Schaefer, Gail H; Mason, Brian D; Tingle, Evan; Karovska, Margarita; Pillitteri, Ignazio (2016). "Hubble Space Telescope Snapshot Survey for Resolved Companions of Galactic Cepheids". The Astronomical Journal. 151 (5): 129. arXiv:1603.02224. Bibcode:2016AJ....151..129E. doi:10.3847/0004-6256/151/5/129. S2CID 119248298.
^ [a b c] Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
^ Houk, Nancy (1978). "Michigan catalogue of two-dimensional spectral types for the HD stars". Ann Arbor: Dept. Of Astronomy. Ann Arbor. 2. Bibcode:1978mcts.book.....H
^ [a b c d] Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal. 147 (6): 137. Bibcode:2014AJ....147..137L. doi:10.1088/0004-6256/147/6/137.
^ [a b] de Bruijne, J. H. J.; Eilers, A.-C. (October 2012). "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project". Astronomy & Astrophysics. 546: 14. arXiv:1208.3048. Bibcode:2012A&A...546A..61D. doi:10.1051/0004-6361/201219219. S2CID 59451347. A61.
^ [a b c] 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. S2CID 119257644.
^ [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, S2CID 118629873
^ Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID 53666672.
^ HD 68808 (unistra.fr). Hämtad 2024-02-24.
^ "HD 68808". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 16 augusti 2018.
^ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
^ [a b] Watson, Christopher (4 January 2010). "AH Velorum". AAVSO Website. American Association of Variable Star Observers. Hämtad 12 mars 2014.

Externa länkar

https://www.universeguide.com/star/star/40155/ahvelorum.

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

[B-2] [a b c] Evans, Nancy Remage; Bond, Howard E; Schaefer, Gail H; Mason, Brian D; Tingle, Evan; Karovska, Margarita; Pillitteri, Ignazio (2016). "Hubble Space Telescope Snapshot Survey for Resolved Companions of Galactic Cepheids". The Astronomical Journal. 151 (5): 129. arXiv:1603.02224. Bibcode:2016AJ....151..129E. doi:10.3847/0004-6256/151/5/129. S2CID 119248298.

[C-3] [a b c] Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.

[D-4] Houk, Nancy (1978). "Michigan catalogue of two-dimensional spectral types for the HD stars". Ann Arbor: Dept. Of Astronomy. Ann Arbor. 2. Bibcode:1978mcts.book.....H

[E-5] [a b c d] Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal. 147 (6): 137. Bibcode:2014AJ....147..137L. doi:10.1088/0004-6256/147/6/137.

[F-6] [a b] de Bruijne, J. H. J.; Eilers, A.-C. (October 2012). "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project". Astronomy & Astrophysics. 546: 14. arXiv:1208.3048. Bibcode:2012A&A...546A..61D. doi:10.1051/0004-6361/201219219. S2CID 59451347. A61.

[G-7] [a b c] 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. S2CID 119257644.

[H-8] [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, S2CID 118629873

[I-9] Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID 53666672.

[SIMBAD-10] HD 68808 (unistra.fr). Hämtad 2024-02-24.

[J-11] "HD 68808". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 16 augusti 2018.

[K-12] Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.

[L-13] [a b] Watson, Christopher (4 January 2010). "AH Velorum". AAVSO Website. American Association of Variable Star Observers. Hämtad 12 mars 2014.

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Observationsdata Epok: J2000.0
AH Velorum

Stjärnbild	Seglet
Rektascension	08^t 11^m 59,96702^s^[1]
Deklination	-46° 38′ 39,6561″^[1]
Skenbar magnitud ( $V$ )	5,70^[2] (5,50-5,89)^[3]
Stjärntyp
Spektraltyp	F7 Ib-II^[4]
B–V	+0,59^[5]
Variabeltyp	Klassisk cepheid^[3]
Astrometri
Radialhastighet ( $R_{v}$ )	+26,0 ± 2,9^[6] km/s
Egenrörelse (µ)	RA: -4,405^[1] mas/år Dek.: +6,768 ± 0,060^[1] mas/år
Parallax ( $\pi$ )	1,2170 ± 0,0570^[1]
Avstånd	2 700 ± 100 lå (820 ± 40 pc)
Absolut magnitud ( $M_{V}$ )	-2,52^[7]
Detaljer
Massa	7,0 ± 0,5^[8] M_☉
Luminositet	929,98^[7] L_☉
Temperatur	6 102^[5] K
Metallicitet	+0,09^[5]
Vinkelhastighet	10,0 ± 0,5^[9] km/s
Ålder	50,0 ± 11,0^[8] miljoner år
Andra beteckningar
HD 68808, CD-46 3902, CPD-46 2254, GSC 08136-01166, HIC 40155, HIP 40155, HR 3232, IRAS 08104-4629, 2MASS J08115997-4638397, PPM 312739, SAO 219587, TYC 8136-1166-1, uvby98 100068808, AH Velorum, Gaia DR3 5519380081746387328, Gaia DR1 5519380077440172672, Gaia DR2 5519380077440172672^[10]^[11]