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C o o r d i n a t e s : 22 h 05 m 4 7 . 0 3 5 9 3 s , − 0 0 ° 1 9 ′ 1 1 . 4 5 6 8 ″
F r o m W i k i p e d i a , t h e f r e e e n c y c l o p e d i a
( R e d i r e c t e d f r o m Α A q u a r i i )
Star in the constellation Aquarius
Alpha Aquarii
Location of α Aquarii (circled)
Observation dataEpoch J2000.0 Equinox J2000.0 (ICRS )
Constellation
Aquarius
Right ascension 22 h 05 m s [1]
Declination
−00° 19 ′ 11.4634″[1]
Apparent magnitude (V )2.942[2]
Characteristics
Spectral type
G2 Ib [3]
U−B color index
+0.699[2]
B−V color index
+0.971[2]
R−I color index
+0.49[2]
Astrometry Radial velocity (R v 7.5[4] Proper motion (μ) RA: +18.59 mas /yr [1] Dec.: mas /yr [1] Parallax (π)4.9451 ± 0.4296 mas [1] Distance +37.8 ly +11.6 pc [5] Absolute magnitude (M V −3.882[6] Details Mass 6.31[7] M ☉ Radius 83 [7] R ☉ Luminosity 3,917[7] L ☉ Surface gravity (log g 1.4[7] cgs Temperature ± 74 [8] K Metallicity +0.17[6] dex Rotational velocity (v i ± 1.5[9] Age 53 [3] Myr Other designations
El Melik, Rucbah, Saad el Melik, Sadalmelek, Sadalmelik, Sadlamulk, α Aqr, Alpha Aquarii, Alpha Aqr , 34 Aquarii, 34 Aqr , BD FK5 827, Gaia DR2 2680356911815074432HD HIP 109074, HR SAO 145862, WDS 22058-00192MASS J22054703-0019114[10] [11] [12] [13]
Database references SIMBAD data
Alpha Aquarii , officially named Sadalmelik (),[14] star in the constellation of Aquarius . The apparent visual magnitude of 2.94[2] parallax measurements made by the Gaia light-years (210 parsecs ) from the Sun .[5] radial velocity of 7.5 km/s.[4]
It forms the primary or 'A' component of a double star designated WDS J22058-0019; the secondary or 'B' component is UCAC2 31789179 .[15]
Nomenclature
[ edit ]
α Aquarii (Latinised to Alpha Aquarii ) is the star's Bayer designation . WDS J22058-0019 A is its designation in the Washington Double Star Catalog .
It bore the traditional name Sadalmelik , which derived from an Arabic expression سعد الملك (sa‘d al-malik ), meaning "Luck of the king". The name Rucbah had also been applied to this star; though it shared that name with Delta Cassiopeiae .[13] celestial equator . The origin of the Arabic name is lost to history.[16] International Astronomical Union organized a Working Group on Star Names (WGSN)[17] Sadalmelik for Alpha Aquarii (WDS J22058-0019 A) on 21 August 2016, and it is now so included in the List of IAU-approved Star Names (Delta Cassiopeiae was given the name Ruchbah ).[14]
In Chinese , 危宿 Wēi Xiù Rooftop (asterism)asterism consisting of Alpha Aquarii, Theta Pegasi and Epsilon Pegasi .[18] Chinese name for Alpha Aquarii itself is 危宿一 Wēi Xiù yī the First Star of Rooftop ).[19]
Properties
[ edit ]
With an age of 53 million years,[3] evolved into a supergiant with a stellar classification of G2 Ib.[3] Cepheid instability strip of the Hertzsprung–Russell diagram , near the red (cooler) edge, but is not classified as a variable star . However, variable cores have been detected in the hydrogen lines , which are originating in a circumstellar envelope.[20] stellar wind that reaches supersonic velocity in the chromosphere .[21]
There is some uncertainty about Alpha Aquarii's distance. The original Hipparcos catalog gave a parallax of ± 0.83 mas ± 45 parsecs light-years .[22] ± 0.19 milliarcseconds± 5 pc [23] Gaia spacecraft on its second data release (DR2 ) give a parallax of ± 0.8 mas± 4.8 pc [24] Gaia DR3 ) give a parallax of ± 0.43 mas± 17 pc light-years .[1]
Alpha Aquarii has 6.3 times as much mass as the Sun and has expanded to around 80 times the Sun's radius . It is radiating 3,900 times as much luminosity as the Sun from its outer atmosphere [7] effective temperature of K [8] G-type star .[25] Chandra X-ray Observatory shows it to be significantly X-ray deficient compared to G-type main-sequence stars . This deficit is a common feature of early G-type giant stars.[9]
The visual companion (UCAC2 31789179) has an apparent visual magnitude of approximately 12.2. It is at an angular separation of 110.4 arcseconds from Alpha Aquarii along a position angle of 40°.[12]
References
[ edit ]
^ a b c d e Cousins, A. W. J. (1984), "Standardization of Broadband Photometry of Equatorial Standards", South African Astronomical Observatory Circulars , 8 Bibcode :1984SAAOC...8...59C
^ a b c d Lyubimkov, Leonid S.; et al. (February 2010), "Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood", Monthly Notices of the Royal Astronomical Society 402 (2 ): 1369–1379, arXiv :0911.1335 Bibcode :2010MNRAS.402.1369L , doi :10.1111/j.1365-2966.2009.15979.x , S2CID 119096173
^ a b Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veröff. Astron. Rechen-Inst. Heidelb , 35 35 ), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode :1999VeARI..35....1W
^ a b Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M.; Demleitner, M.; Andrae, R. (2021-03-01). "Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3" . The Astronomical Journal . 161 (3 ): 147. arXiv :2012.05220 Bibcode :2021AJ....161..147B . doi :10.3847/1538-3881/abd806 ISSN 0004-6256 . here .
^ a b Soubiran, C.; et al. (2008). "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants". Astronomy and Astrophysics . 480 (1 ): 91–101. arXiv :0712.1370 Bibcode :2008A&A...480...91S . doi :10.1051/0004-6361:20078788 . S2CID 16602121 .
^ a b c d e Ayres, Thomas (2023-05-01). "In the Trenches of the Solar-Stellar Connection. VII. Wilson-Bappu 2022" . The Astrophysical Journal Supplement Series . 266 (1 ): 6. Bibcode :2023ApJS..266....6A . doi :10.3847/1538-4365/acb535 ISSN 0067-0049 . Alpha Aquarii's database entry at VizieR .
^ a b Baines, Ellyn K.; et al. (2018). "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer" . The Astronomical Journal . 155 (1 ). 30. arXiv :1712.08109 Bibcode :2018AJ....155...30B doi :10.3847/1538-3881/aa9d8b
^ a b Ayres, Thomas R.; Brown, Alexander; Harper, Graham M. (July 2005), "Chandra Observations of Coronal Emission from the Early G Supergiants α and β Aquarii", The Astrophysical Journal , 627 (1 ): L53–L56, Bibcode :2005ApJ...627L..53A , doi :10.1086/431977 S2CID 122519436
^ HR 8414 , database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50 . Accessed on line October 3, 2008.
^ "Alpha Aquarii" . SIMBAD Centre de données astronomiques de Strasbourg .
^ a b Entry 22058-0019, The Washington Double Star Catalog Archived 2009-01-31 at the Wayback Machine , United States Naval Observatory . Accessed on line November 18, 2008.
^ a b pp. 51, 148, Star-names and Their Meanings
^ a b "Naming Stars" . IAU.org. Retrieved 25 February 2018 .
^ "UCAC2 31789179 -- Star" , SIMBAD , Centre de Données astronomiques de Strasbourg, retrieved 2018-02-25
^ Sadalmelik , Stars , Jim Kaler. Accessed on line October 3, 2008.
^ IAU Working Group on Star Names (WGSN) International Astronomical Union , retrieved 22 May 2016 .
^ (in Chinese) 中國星座神話 , written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7 .
^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived 2010-08-18 at the Wayback Machine , Hong Kong Space Museum. Accessed on line November 23, 2010.
^ Usenko, I. A.; et al. (November 2017), "Spectroscopic studies of the unique yellow supergiant α Aqr in the Cepheid instability strip", Astronomy Letters , 43 11 ): 751–767, Bibcode :2017AstL...43..751U , doi :10.1134/S1063773717110068 , S2CID 41734976 .
^ Dupree, A. K.; et al. (December 1993), "HST/GHRS Spectroscopy of the Hybrid Star Alpha Aquarii", Bulletin of the American Astronomical Society , 25 Bibcode :1993AAS...183.1807D , 18.07.
^ ESA (1997-01-01). "The HIPPARCOS and TYCHO catalogues. Astrometric and photometric star catalogues derived from the ESA HIPPARCOS Space Astrometry Mission" . ESA Special Publication . 1200 . ISSN 1609-042X .
^ 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 , S2CID 18759600
^ 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 .
^ "The Colour of Stars" , Australia Telescope, Outreach and Education , Commonwealth Scientific and Industrial Research Organisation , December 21, 2004, archived from the original on February 22, 2012, retrieved 2012-01-16
External links
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R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Alpha_Aquarii&oldid=1235929437 " C a t e g o r i e s : ● G - t y p e s u p e r g i a n t s ● D o u b l e s t a r s ● A q u a r i u s ( c o n s t e l l a t i o n ) ● 2 M A S S o b j e c t s ● B a y e r o b j e c t s ● D u r c h m u s t e r u n g o b j e c t s ● F l a m s t e e d o b j e c t s ● H e n r y D r a p e r C a t a l o g u e o b j e c t s ● H i p p a r c o s o b j e c t s ● B r i g h t S t a r C a t a l o g u e o b j e c t s ● S t a r s w i t h p r o p e r n a m e s H i d d e n c a t e g o r i e s : ● W e b a r c h i v e t e m p l a t e w a y b a c k l i n k s ● A r t i c l e s w i t h C h i n e s e - l a n g u a g e s o u r c e s ( zh ) ● A r t i c l e s w i t h s h o r t d e s c r i p t i o n ● S h o r t d e s c r i p t i o n m a t c h e s W i k i d a t a ● A r t i c l e s c o n t a i n i n g C h i n e s e - l a n g u a g e t e x t ● A r t i c l e s c o n t a i n i n g e x p l i c i t l y c i t e d E n g l i s h - l a n g u a g e t e x t
● T h i s p a g e w a s l a s t e d i t e d o n 2 1 J u l y 2 0 2 4 , a t 2 3 : 4 1 ( U T C ) . ● T e x t i s a v a i l a b l e u n d e r t h e C r e a t i v e C o m m o n s A t t r i b u t i o n - S h a r e A l i k e L i c e n s e 4 . 0 ;
a d d i t i o n a l t e r m s m a y a p p l y . B y u s i n g t h i s s i t e , y o u a g r e e t o t h e T e r m s o f U s e a n d P r i v a c y P o l i c y . W i k i p e d i a ® i s a r e g i s t e r e d t r a d e m a r k o f t h e W i k i m e d i a F o u n d a t i o n , I n c . , a n o n - p r o f i t o r g a n i z a t i o n . ● P r i v a c y p o l i c y ● A b o u t W i k i p e d i a ● D i s c l a i m e r s ● C o n t a c t W i k i p e d i a ● C o d e o f C o n d u c t ● D e v e l o p e r s ● S t a t i s t i c s ● C o o k i e s t a t e m e n t ● M o b i l e v i e w
22h05m47.03593s, −00° 19′ 11.4568″
