Albireo

Albireo
Location of Albireo (circled in red)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cygnus
Albireo Aa
Right ascension 19h 30m 43.286s[1]
Declination +27° 57′ 34.84″[1]
Apparent magnitude (V) 3.21[2]
Albireo Ac
Right ascension 19h 30m 43.295s[3]
Declination +27° 57′ 34.62″[3]
Apparent magnitude (V) 5.85[2]
Albireo B
Right ascension 19h 30m 45.3962s[4]
Declination +27° 57′ 54.989″[4]
Apparent magnitude (V) 5.11[5]
Characteristics
Albireo Aa
Evolutionary stage Bright giant
Spectral type K2II[6]
B−V color index +1.13[5]
V−R color index +0.92[7]
Albireo Ac
Spectral type B8:p[6]
B−V color index +0.09[3]
V−R color index +0.09[7]
Albireo B
Spectral type B8Ve[8]
U−B color index -0.32[5]
B−V color index -0.10[5]
Astrometry
Albireo A
Radial velocity (Rv)−23.54[2] km/s
Proper motion (μ) RA: 4.915 mas/yr[9]
Dec.: −11.127 mas/yr[9]
Parallax (π)8.9816 ± 0.4474 mas[9]
Distance364.8+15.6
−15.3 ly
(111.9+4.8
−4.7 pc)[10]
Albireo Aa
Absolute magnitude (MV)−2.45[6]
Albireo Ac
Absolute magnitude (MV)−0.25[6]
Albireo B
Radial velocity (Rv)−18.80[11] km/s
Proper motion (μ) RA: −1.078[12] mas/yr
Dec.: −1.540[12] mas/yr
Parallax (π)8.1896 ± 0.0781 mas[12]
Distance395.4+2.9
−3.3 ly
(121.3+0.9
−1 pc)[10]
Position (relative to Albireo A)
ComponentAlbireo B
Epoch of observation2006
Angular distance35.3″ [13]
Position angle54° [13]
Orbit[2]
PrimaryAa
CompanionAc
Period (P)121.65+3.34
−2.90 yr
Semi-major axis (a)0.401+0.007
−0.006″
Eccentricity (e)0.20+0.01
−0.02
Inclination (i)156.15+2.90
−2.63°
Longitude of the node (Ω)84.43+5.27
−4.50°
Periastron epoch (T)B2026.36
Argument of periastron (ω)
(secondary)		54.72+1.88
−2.24°
Semi-amplitude (K1)
(primary)		2.91+0.09
−0.12 km/s
Details
Albireo Aa
Mass5.2[2] M☉
Radius58.69+2.83
−3.12[14] R☉
Luminosity (bolometric)1,259[2] L☉
Surface gravity (log g)0.93[2] cgs
Temperature4,383[2] K
Metallicity [Fe/H]−0.1[15] dex
Rotational velocity (v sin i)8.34[2] km/s
Albireo Ac
Mass2.7[2] M☉
Radius3.0[a] R☉
Luminosity (bolometric)79[2] L☉
Temperature10,000[2] K
Albireo Ad
Mass0.085 ± 0.007[16] M☉
Albireo B
Mass3.7 ± 0.8[17] M☉
Radius2.59[18] R☉
Luminosity (bolometric)230 ± 90[17] L☉
Surface gravity (log g)4.00 ± 0.15[17] cgs
Temperature13,200 ± 600[17] K
Age100[17] Myr
Other designations
β Cygni, 6 Cygni, ADS 12540, CCDM J19307+2758, WDS 19307+2758[19][20][21]
Albireo A: β¹ Cygni, BD+27 3410, HR 7417, HD 183912/183913, HIP 95947, SAO 87301, FK5 732, MCA 55 Aac, NSV 12105
Albireo B: β² Cygni, STF 4043B, BD+27 3411, HD 183914, HIP 95951, HR 7418, SAO 87302[22]
Database references
SIMBADβ Cyg (STF 4043)
Albireo A
Albireo Aa
Albireo Ab
Albireo B

Albireo /ælˈbɪrioʊ/[23] is a binary star designated Beta Cygni (β Cygni, abbreviated Beta Cyg, β Cyg). The International Astronomical Union uses the name "Albireo" specifically for the brightest star in the system.[24] Although designated 'beta', it is fainter than Gamma Cygni, Delta Cygni, and Epsilon Cygni and is the fifth-brightest point of light in the constellation of Cygnus. Appearing to the naked eye to be a single star of magnitude 3, viewing through even a low-magnification telescope resolves it into its two components. The brighter yellow star, itself a very close trinary system, makes a striking colour contrast with its fainter blue companion.[25]

Nomenclature

Albireo is the star in the head of the constellation of Cygnus (bottom).

β Cygni (Latinised to Beta Cygni) is the system's Bayer designation. The brighter of the two components is designated β¹ Cygni or Beta Cygni A and the fainter β² Cygni or Beta Cygni B.

The origin of the star system's traditional name Albireo is unclear. Christian Ludwig Ideler traced it to the heading for the constellation we call Cygnus in Ptolemy's star catalog, in the translation of the Almagest by Gerard of Cremona: "Stellatio Eurisim: et est volans; et jam vocatur gallina. et dicitur eurisim quasi redolens ut lilium ab ireo" ("Constellation Eurisim: and it is the Flyer, and it is also called the Hen, and it is called Eurisim as if redolent like the lily from the 'ireo'"). (The original Greek just calls the constellation "Ορνιθος αστερισμος", "the constellation of the Bird".) The word "ireo" is obscure as well – Ideler suggests that Gerard took "Eurisim" to mean the plant Erysimum, which is called irio in Latin, but the ablative case of that is not "ireo" but irione.[26] In any case, Ideler proposed that (somehow) the phrase "ab ireo" was applied to the star at the head of the bird, and this became "Albireo" when an "l" was mistakenly inserted as though it was an Arabic name.[27] Ideler also supposed that the name Eurisim was a mistaken transliteration of the Arabic name "Urnis" for Cygnus (from the Greek "Ορνις").

In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[28] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[29] included a table of the first two batches of names approved by the WGSN; which included Albireo for β¹ Cygni. It is now so entered in the IAU Catalog of Star Names.[24]

Medieval Arabic-speaking astronomers called Beta Cygni minqār al-dajājah (English: the hen's beak).[30] The term minqār al-dajājah (منقار الدجاجة) or Menchir al Dedjadjet appeared in the catalogue of stars in the Calendarium of Al Achsasi Al Mouakket, which was translated into Latin as Rostrum Gallinae, meaning the hen's beak.[31]

Since Cygnus is the swan, and Beta Cygni is located at the head of the swan, it is sometimes called the "beak star".[32] With Deneb, Gamma Cygni (Sadr), Delta Cygni, and Epsilon Cygni (Gienah), it forms the asterism called the Northern Cross.[33]

Properties

Albireo A and B

Beta Cygni is about 420 light-years (129 pc) away from the Sun.[2] When viewed with the naked eye, Albireo appears to be a single star. However, in a telescope it resolves into a double star consisting of β Cygni A (amber, apparent magnitude 3.1), and β Cygni B (blue-green, apparent magnitude 5.1).[34] Separated by 35 seconds of arc,[13] the two components provide one of the best contrasting double stars in the sky due to their different colors.

It is not known whether the two components β Cygni A and B are orbiting around each other in a physical binary system, or if they are merely an optical double.[2] If they are a physical binary, their orbital period is probably at least 100,000 years.[34] Some experts, however, support the optical double argument, based on observations that suggest different proper motions for the components, which implies that they are unrelated.[35] The primary and secondary also have different measured distances from the Hipparcos mission – 434 ± 20 light-years (133 ± 6 pc) for the primary and 401 ± 13 light-years (123 ± 4 pc) for the secondary.[36] More recently the Gaia mission has measured distances of about 330–390 light years (100–120 parsecs) for both components, but noise in the astrometric measurements for the stars means that data from Gaia's second data release is not yet sufficient to determine whether the stars are physically associated.[37]

In around 3.87 million years, Albireo will become the brightest star in the night sky.[38] It will peak in brightness with an apparent magnitude of –0.53 in 4.61 million years.[38]

There are a further 10 faint companions listed in the Washington Double Star catalogue, all fainter than magnitude 10. Only one is closer to the primary than Albireo B, with the others up to 142" away.[20]

Albireo A

The spectrum of Beta Cygni A was found to be composite when it was observed as part of the Henry Draper Memorial project in the late 19th century, leading to the supposition that it was itself double.[39] This was supported by observations from 1898 to 1918 which showed that it had a varying radial velocity.[40] In 1923, the two components were identified in the Henry Draper Catalogue as HD 183912 and HD 183913.[41][42]

In 1978, speckle interferometry observations using the 1.93m telescope at the Haute-Provence Observatory resolved a companion at 0.125". This observation was published in 1980,[43] and the companion is referred to as component Ab in the Washington Double Star Catalog.[20]

In 1976 speckle interferometry was used to resolve a companion using the 2.1-meter telescope at the Kitt Peak National Observatory. It was measured at a separation of 0.44", and it is noted that the observation was inconsistent with the Haute-Provence observations and hence not of the same star.[21][44] Although these observations pre-dated those at Haute-Provence, they were not published until 1982 and this component is designated Ac in the Washington Double Star Catalog.[20] It is designated as component C in the Catalog of Components of Double and Multiple Stars,[45] not to be confused with component C in the Washington Double Star Catalog which is a faint optical companion.[20] An orbit for the pair has since been computed using interferometric measurements, but as only approximately a quarter of the orbit has been observed, the orbital parameters must be regarded as preliminary. The period of this orbit is 214 years.[21] The confirmed close pair are referred to as Aa and Ac in modern papers, with Ab being the unconfirmed third component.[2] A 2022 study treats the existence of Albireo Ab as "very unlikely".[16]

In 2022, a third component was found to be orbiting Albireo Aa, named Albireo Ad. It is a very-low-mass star with around 8.5% the Sun's mass and an orbital period of 371 days.[16]

The diameter of the primary K-type giant star has been measured using interferometry from the Navy Precision Optical Interferometer. A limb-darkened angular diameter of 4.904 mas was measured. At the parallax-derived distance of 111.4 pc, a radius equivalent to 58.69 R☉ is calculated.[14]

Albireo B

β Cygni B is a fast-rotating Be star, with an equatorial rotational velocity of at least 250 kilometers per second.[25] Its surface temperature has been spectroscopically estimated to be about 13,200 K.[17]

β Cygni B has been reported to be a very close double,[46] but the observations appear to have been incorrect.[20]

Moving group

Analysis of Gaia Data Release 2 astrometry suggests that four fainter stars may form a moving group along with the brighter visible components.[2]

Namesakes

Albireo (AK-90) was a United States Navy Crater-class cargo ship named after the star.

Notes

  1. ^ Applying the Stefan-Boltzmann Law with a nominal solar effective temperature of 5,772 K:

References

  1. ^ a b Høg, E; Fabricius, C; Makarov, V. V; Urban, S; Corbin, T; Wycoff, G; Bastian, U; Schwekendiek, P; Wicenec, A (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H.
  2. ^ a b c d e f g h i j k l m n o p Drimmel, Ronald; Sozzetti, Alessandro; Schröder, Klaus-Peter; Bastian, Ulrich; Pinamonti, Matteo; Jack, Dennis; Hernández Huerta, Missael A. (2021). "A celestial matryoshka: Dynamical and spectroscopic analysis of the Albireo system". Monthly Notices of the Royal Astronomical Society. 502 (1): 328. arXiv:2012.01277. Bibcode:2021MNRAS.502..328D. doi:10.1093/mnras/staa4038.
  3. ^ a b c Fabricius, C; Høg, E; Makarov, V. V; Mason, B. D; Wycoff, G. L; Urban, S. E (2002). "The Tycho double star catalogue". Astronomy and Astrophysics. 384: 180–189. Bibcode:2002A&A...384..180F. doi:10.1051/0004-6361:20011822.
  4. ^ a b 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. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  5. ^ a b c d Ducati, J. R (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  6. ^ a b c d Ginestet, N.; Carquillat, J. M. (2002). "Spectral Classification of the Hot Components of a Large Sample of Stars with Composite Spectra, and Implication for the Absolute Magnitudes of the Cool Supergiant Components". The Astrophysical Journal Supplement Series. 143 (2): 513. Bibcode:2002ApJS..143..513G. doi:10.1086/342942.
  7. ^ a b Ten Brummelaar, Theo; Mason, Brian D; McAlister, Harold A; Roberts, Lewis C; Turner, Nils H; Hartkopf, William I; Bagnuolo, William G (2000). "Binary Star Differential Photometry Using the Adaptive Optics System at Mount Wilson Observatory". The Astronomical Journal. 119 (5): 2403. Bibcode:2000AJ....119.2403T. doi:10.1086/301338.. See tables 4, 5, 6, and 8. Luminosity from Lbol=102(4.75−Mbol)/5.
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  9. ^ a b Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  10. ^ 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. Data about this star can be seen here.
    Beta1 Cygni = Gaia DR3 2026116260337482112
    Beta2 Cygni = Gaia DR3 2026113339752723456
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  14. ^ a b Baines, Ellyn K.; Clark, James H., III; Schmitt, Henrique R.; Stone, Jordan M.; von Braun, Kaspar (2023-12-01), "33 New Stellar Angular Diameters from the NPOI, and Nearly 180 NPOI Diameters as an Ensemble", The Astronomical Journal, 166 (6): 268, Bibcode:2023AJ....166..268B, doi:10.3847/1538-3881/ad08be, ISSN 0004-6256{{citation}}: CS1 maint: multiple names: authors list (link)
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  16. ^ a b c Jack, D.; Schröder, K.-P.; Mittag, M.; Bastian, U. (2022-05-01). "Yet another star in the Albireo system - The discovery of Albireo Ad". Astronomy & Astrophysics. 661: A49. arXiv:2203.04222. doi:10.1051/0004-6361/202243255. ISSN 0004-6361.
  17. ^ a b c d e f Table 1, Levenhagen, R. S. (2004). "Physical Parameters of Southern B- and Be-Type Stars". The Astronomical Journal. 127 (2): 1176–1180. Bibcode:2004AJ....127.1176L. doi:10.1086/381063. S2CID 121487369.
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  19. ^ NAME ALBIREO -- Star in double system , database entry, SIMBAD. Accessed on line July 9, 2008.
  20. ^ a b c d e f Entry, WDS identifier 19307+2758, Sixth Catalog of Orbits of Visual Binary Stars Archived 2017-11-12 at the Wayback Machine, William I. Hartkopf & Brian D. Mason, U.S. Naval Observatory. Accessed on line July 9, 2008. (19307+2758) Archived 2011-05-17 at the Wayback Machine
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  22. ^ HD 183914 -- Emission-line Star, database entry, SIMBAD. Accessed on line July 9, 2008.
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  27. ^ "LacusCurtius • Allen's Star Names — Cygnus". Allen quotes (in translation) a passage from Ideler's Untersuchungen über den Ursprung und die Bedeutung der Sternnamen (1809), page 75.
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Further reading

  • Webb, T. W.; McAlister, H. A.; Worley, C. E.; Burnham, S. W.; Aitken, R. G. (1980). "Albireo as a Triple Star". Sky and Telescope. 59: 210. Bibcode:1980S&T....59..210W.
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Tabletop miniature wargame Battlesystem 1st Edition Battlesystem is a tabletop miniature wargame designed as a supplement for use with the Dungeons & Dragons role-playing game. The original Battlesystem was printed as a boxed set in 1985 for use with the first edition AD&D rules. For the second edition of AD&D, a new version of Battesystem was printed as a softcover book in 1989. First edition Contents Battlesystem was first released in 1985, compatible with either Advanced Dungeo...

 

 

Синелобый амазон

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يوزف هيشت

هذه المقالة يتيمة إذ تصل إليها مقالات أخرى قليلة جدًا. فضلًا، ساعد بإضافة وصلة إليها في مقالات متعلقة بها. (أبريل 2019) يوزف هيشت معلومات شخصية الميلاد 14 ديسمبر 1891 [1][2][3]  وودج  الوفاة 19 يونيو 1951 (59 سنة) [4]  الدائرة الخامسة عشرة في باريس  الإقامة النروي�...

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Village in Zakarpattia Oblast, UkraineOnokivtsi ОноківціVillage FlagCoat of armsOnokivtsiShow map of UkraineOnokivtsiShow map of Zakarpattia OblastCoordinates: 48°39′15″N 22°20′30″E / 48.65417°N 22.34167°E / 48.65417; 22.34167Country UkraineProvince Zakarpattia OblastDistrict Uzhhorod RaionFoundation1412Population • Total2 187Time zoneUTC+2 (EET) • Summer (DST)UTC+3 (EEST)Postal code89412WebsiteOnokivtsi Information...

 

 

International Talent Support

International Talent Support (ITS) is a platform created to give support and visibility to young talents in the field of fashion design, design of accessories and jewelry. The most artistic-oriented designers are also challenged with ITS Artwork, a purely artistic contest.[1][2] The 16th edition which will be held once again in Trieste on 27 June 2018. Barbara Franchin holding the heart trophy at ITS 2015 Contestants are selected from more than 80 countries around the world. ...

 

 

2019 T20 Kwacha Cup

International cricket tournament The 2019 T20 Kwacha Cup was a men's Twenty20 International/women's Twenty20 International (T20I) cricket event between the men's and women's national cricket teams of Malawi and Mozambique. Both the men's and women's series consisted of seven T20I matches played between 6 and 10 November 2019 in Blantyre and Lilongwe, Malawi.[1][2] The venue for the first four men's T20I matches was the Lilongwe Golf Club in Lilongwe, and these were followed by...

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Blackpool Council

Blackpool CouncilTypeTypeUnitary authority LeadershipMayorPeter Hunter, Labour since 15 May 2024[1] LeaderLynn Williams, Labour since 20 July 2020[2] Chief ExecutiveNeil Jack since 21 July 2011[3] StructureSeats42 councillors[4]Political groups Administration (28)   Labour (28) Opposition (15)   Conservative (14) Length of term4 yearsElectionsVoting systemPlurality-at-large[a]Last election4 May 2023Next election6 May 2027MottoProgress...

 

 

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