Vega (réalta)

Vega
Cineál	A-type main sequence star (en) , réalta threorach, réalta athraitheach de chineál Delta Scuti, réalta dhúbailte, foinse neas-infridhearg, réalta ard-dualghluaisne, foinse UV agus réalta athraitheach
Cineál speictreach (réalta)	A0Va
Réaltbhuíon	an Lir
Aois	J2000.0
Saintréithe fisiceacha agus réaltmhéadracha
Fad ón Domhan	7.67 pc
Ga	meánchiorcal: 2.818 R☉
Trastomhas	3,770,000 km
Dearbhmhéid	0.582
Méid dhealraitheach (V)	0.03 (banda V)
Mais	2.135 M☉
Teocht éifeachtach	9,550 K
Saobhdhiallas	128.2 mas
Dualghluaisne (diallas)	285.46 mas/y
Dualghluaisne (dronairde)	201.85 mas/y
Luas rothlaithe réaltach	24 km/s
Luas gathach	−20.6 km/s
Imtharraingt dromchla	9,000 cm/s²
Dronairde (α)	18h 36m 56.3363s
Diallas (δ)	38° 47′ 1.2802″
Miotalacht	−0.5
Lonrachas	40.12 lonrachas na gréine
Aois measta	455 megaannum (en)
Cuid de	Summer Triangle (en) agus Castor Moving Group (en)
Catalóga réalteolaíochta
	SAO 67174 (Smithsonian Astrophysical Observatory Star Catalog (en) ); 2MASS J18365633+3847012 (2MASS); HD 172167 (catalóg Henry Draper); HIP 91262 (Hipparcos Catalogue (en) ); HR 7001 (Bright Star Catalogue (en) ); IRAS 18352+3844 (IRAS); GJ 721 (Gliese Catalogue of Nearby Stars (en) ); GJ 721.0 (Gliese Catalogue of Nearby Stars (en) ); α Lyr (Bayer designation (en) ); ADS 11510 A (Aitken Double Star Catalogue (en) ); ASCC 507896 (All-sky Compiled Catalogue (en) ); BD+38 3238 (Durchmusterung (en) ); CCDM J18369+3847A (Catalog of Components of Double and Multiple Stars (en) ); CEL 4636 (Celescope Catalogue of Ultraviolet Magnitudes (en) ); CSV 101745 (Catalogue of suspected variable stars (en) ); EUVE J1836+38.7 (The first Extreme Ultraviolet Explorer source catalog (en) ); FK5 699 (FK5 (en) ); GC 25466 (Boss General Catalogue (en) ); GCRV 11085 (General Catalogue of Stellar Radial Velocities (en) ); HIC 91262 (Hipparcos Input Catalogue (en) ); IDS 18336+3841 A (Index Catalogue of Visual Double Stars (en) ); IRAS F18352+3844 (IRAS); IRC +40322 (Two-Micron Sky Survey (en) ); JP11 2999 (JP11 (en) ); LSPM J1836+3847 (LSPM-NORTH catalog (en) ); LTT 15486 (Luyten Two-Tenths catalogue (en) ); N30 4138 (Catalog of 5,268 Standard Stars Based on the Normal System N30 (en) ); NLTT 46746 (New Luyten Two-Tenths catalogue (en) ); NSV 11128 (New Catalogue of Suspected Variable Stars (en) ); PLX 4293 (General Catalogue of Trigonometric Stellar Parallaxes (en) ); PLX 4293.00 (General Catalogue of Trigonometric Stellar Parallaxes (en) ); PMC 90-93 496 (Tokyo Photoelectric Meridian Circle Catalog (en) ); PPM 81558 (PPM Star Catalogue (en) ); RAFGL 2208 (The Revised AFGL (RAFGL) catalogue (en) ); ROT 2633 (Catalogue of rotational velocities of the stars (en) ); TD1 22883 (TD1 Catalog of Stellar Ultraviolet Fluxes (en) ); TYC 3105-2070-1 (Tycho Catalogue (en) ); UBV 15842 (UBV Photoelectric Photometry Catalogue (en) ); alf Lyr (General Catalogue of Variable Stars); WDS J18369+3846A (Washington Double Star Catalog (en) ); Zkh 277 (Zhakozhaj (en) ); uvby98 100172167 (uvbyβ Photoelectric Photometric Catalogue (en) ); HGAM 706 (A catalogue of Hgamma measures (en) ); WEB 15681 (Vitesses radiales. Catalogue WEB: Wilson Evans Batten. Radial velocities: The Wilson-Evans-Batten catalogue (en) ); 3 Lyr (Flamsteed designation (en) ); TIC 157587146 (TESS Input Catalog (en) ); AG+38 1711 (AGK3U (en) ); UBV M 23118 (UBV Photoelectric Photometry Catalogue (en) )

Is í Vega (nó Alpha Lyrae, α Lyr) an réalta is gile i réaltbhuíon na Líre. Tá sí ar an gcúigiú réalta is gile ar an spéir, agus ar an dara ceann is gile ar spéir oíche an Tuaiscirt, nó is é Arcturus an ceann is gile. Is minic a fheictear in aice an fhorair í i meán-domhanleithead an Tuaiscirt, agus an samhradh ann.

Níl Vega i bhfad ar shiúl uainn, nó níl sí ach faoi 25.3 solasbhliain dínn. In éineacht le Sirius agus Arcturus, tá sí ar réaltaí geala ár gcomharsanachta sa réaltra seo. Ceann de reanna Thriantán an tSamhraidh atá ann, in éineacht le hAltair i réaltbhuíon an Iolair agus le Deneb i réaltbhuíon na hEala. Is réaltlach é Triantán an tSamhraidh atá an-so-aitheanta ar spéir an Tuaiscirt, ó nach bhfuil mórán réaltaí geala ina chóngar.

Baineann Vega leis an aicme speictreach A0V, agus í beagáinín níos teo ná Sirius, atá san aicme A1V. Réalta de chuid an phríomhsheichimh atá ann, agus í ag comhleá hidrigin go héiliam. Ós rud é go bhfuil Vega chomh te sin, is dócha nach mbeidh sí leath chomh fadsaolach ná na réaltaí níos fuaire ná í, ar nós ár nGréine féin. Tá dhá uair go leith níos mó maise i Vega ná sa Ghrian, ach tá sí á dó caoga uair níos fuinniúla.

De thoradh an fheiniméin ar a dtugtar an luainíocht, tiocfaidh Vega in áit Stella Polaris mar réalta pholach, de réir a chéile. Thart ar an mbliain 14,000 i ndiaidh bhreith Chríosta, beidh Vega ina réalta pholach ar spéir an tuaiscirt.

Sonraí breathnóireachta, achoimre

(aga: J2000)

Réaltbhuíon: An Lír/Lyra

Ceartairde: 18h 36m 56.3s

Diallas: +38° 47' 01"

Méid dhealraitheach (V): 0.03

Saintréithre na réalta féin

Aicme speictreach: A0 V

Dathinnéacs B-V: 0.00

Dathinnéacs U-B: -0.01

Réalta athraitheach den chineál Delta Scuti

Saintréithre réaltmhéadrachta

Treoluas gathach (Rv): -13.5 km/s

Dualghluaisne (μ):

RA: 201.02 milleashoicind stua in aghaidh na bliana

Dec.: 287.46 milleashoicind stua in aghaidh na bliana

Saobhdhiallas (π): 129.01 ± 0.52 milleashoicind stua

Fad ón nGrian: 25.27 solasbhliain (7.751 parsoic)

Dearbhmhéid (MV): 0.58

Mionsonraí

Maise: mais na Gréine méadaithe faoi 2.6

Ga: ga na Gréine méadaithe faoi 3.1

Lonrachas: lonrachas na Gréine méadaithe faoi 51

Teocht: 9,300 K

Miotalacht: 63%

Rothlú: níl a fhios againn

Aois: 3.5 × 10⁸ bliain

Sonrúcháin eile

Alpha Lyra, α Lyra, 3 Lyr, GJ 721, HR 7001, BD +38°32

↑ Christopher J. Corbally (Deireadh Fómhair 2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I" (as Béarla) (4): 2048–2059. doi:10.1086/378365.
↑ ^2.0 ^2.1 ^2.2 ^2.3 Jinmi Yoon (8 Nollaig 2009). "A New View of Vega's Composition, Mass, and Age" (as Béarla) (1): 71–79. doi:10.1088/0004-637X/708/1/71.
↑ Henrique Schmitt (20 Nollaig 2017). "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer" (as Béarla) (1): 30-45. doi:10.3847/1538-3881/AA9D8B.
↑ George David Gatewood (13 Meitheamh 2008). "Astrometric Studies of Aldebaran, Arcturus, Vega, the Hyades, and Other Regions" (as Béarla) (1): 452–460. doi:10.1088/0004-6256/136/1/452.
↑ Ráite i: Catalogue of Stellar Photometry in Johnson's 11-color system. Stated in source according to: SIMBAD. Teanga an tsaothair nó an ainm: Béarla. Dáta foilsithe: 2002.
↑ Saul Adelman (11 Feabhra 2014). "Normal A0−A1 stars with low rotational velocities. I. Abundance determination and classification" (as Béarla). doi:10.1051/0004-6361/201322762.
↑ ^7.0 ^7.1 ^7.2 George David Gatewood (13 Meitheamh 2008). "Astrometric Studies of Aldebaran, Arcturus, Vega, the Hyades, and Other Regions" (as Béarla) (1): 452–460. doi:10.1088/0004-6256/136/1/452.
↑ "Rotational velocities of A-type stars. III. Velocity distributions" (as Béarla) (Feabhra 2007) (2): 671–682. doi:10.1051/0004-6361:20065224.
↑ "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system" (as Béarla) (Samhain 2006) (11): 759–771. doi:10.1134/S1063773706110065.
↑ Kim Venn (1990). "The chemical composition of three lambda Bootis stars" (as Béarla): 234–244. doi:10.1086/169334.
↑ ^11.0 ^11.1 Floor van Leeuwen (2007). "Validation of the new Hipparcos reduction" (as Béarla) (2): 653–664. doi:10.1051/0004-6361:20078357.
↑ "Heavy element abundances in Ap stars from ultraviolet data. I. The bright reference stars alpha Lyrae and alpha Canis Majoris A" (1978). doi:10.1086/155808.

[99376777ed08f03277fd2305e1e490f7764e49c3-1] Christopher J. Corbally (Deireadh Fómhair 2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I" (as Béarla) (4): 2048–2059. doi:10.1086/378365.

[37bfce2ec07ccd2c6f34c7521afc3801585c07c5-2] 2.0 ^2.1 ^2.2 ^2.3 Jinmi Yoon (8 Nollaig 2009). "A New View of Vega's Composition, Mass, and Age" (as Béarla) (1): 71–79. doi:10.1088/0004-637X/708/1/71.

[7239f0761649ada51aa4bb9951c94ed01e30e0d4-3] Henrique Schmitt (20 Nollaig 2017). "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer" (as Béarla) (1): 30-45. doi:10.3847/1538-3881/AA9D8B.

[918bfd0c216f9b2f4001e1d8686dedb985f58e3b-4] George David Gatewood (13 Meitheamh 2008). "Astrometric Studies of Aldebaran, Arcturus, Vega, the Hyades, and Other Regions" (as Béarla) (1): 452–460. doi:10.1088/0004-6256/136/1/452.

[a1b1b6b07c06876959d87fc2f8c07203d5b512f3-5] Ráite i: Catalogue of Stellar Photometry in Johnson's 11-color system. Stated in source according to: SIMBAD. Teanga an tsaothair nó an ainm: Béarla. Dáta foilsithe: 2002.

[7bde78db17df8849e67120e8ac13467c81a793a1-6] Saul Adelman (11 Feabhra 2014). "Normal A0−A1 stars with low rotational velocities. I. Abundance determination and classification" (as Béarla). doi:10.1051/0004-6361/201322762.

[5ae4b758e92c3d976764949fc430445f272c9254-7] 7.0 ^7.1 ^7.2 George David Gatewood (13 Meitheamh 2008). "Astrometric Studies of Aldebaran, Arcturus, Vega, the Hyades, and Other Regions" (as Béarla) (1): 452–460. doi:10.1088/0004-6256/136/1/452.

[0c2b03154767959eab917db9a35da11df417ba36-8] "Rotational velocities of A-type stars. III. Velocity distributions" (as Béarla) (Feabhra 2007) (2): 671–682. doi:10.1051/0004-6361:20065224.

[e4ae596e5e49019b6148474aa8b1d0498039646f-9] "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system" (as Béarla) (Samhain 2006) (11): 759–771. doi:10.1134/S1063773706110065.

[d95d9a81cdba70cd4dc92e773be1d8f821500b09-10] Kim Venn (1990). "The chemical composition of three lambda Bootis stars" (as Béarla): 234–244. doi:10.1086/169334.

[8edd049ced48440d6882cc10b733308727e81acc-11] 11.0 ^11.1 Floor van Leeuwen (2007). "Validation of the new Hipparcos reduction" (as Béarla) (2): 653–664. doi:10.1051/0004-6361:20078357.

[8c802b39006baccc0782ebe070baab9502d55f16-12] "Heavy element abundances in Ap stars from ultraviolet data. I. The bright reference stars alpha Lyrae and alpha Canis Majoris A" (1978). doi:10.1086/155808.

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