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21 Aquilae

April 12, 2024

21 Aquilae is a solitary[14] variable star in the equatorial constellation of Aquila. It has the variable star designation V1288 Aql; 21 Aquilae is its Flamsteed designation. This object is visible to the naked eye as a dim, blue-white hued star with a baseline apparent visual magnitude of about 5.1. The star is located at a distance of around 680 light-years (210 parsecs) from Earth, give or take a 20 light-year margin of error. It is moving closer to the Earth with a heliocentric radial velocity of –5 km/s.[6]

21 Aquilae

An ultraviolet band light curve for V1288 Aquilae, adapted from Veto (1980)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 13m 42.70120s[2]
Declination +02° 17′ 37.3103″[2]
Apparent magnitude (V) 5.06 - 5.16[3]
Characteristics
Spectral type B8II-III(Hg?)[4]
U−B color index −0.399[5]
B−V color index −0.065[5]
Variable type α2 CVn[3]
Astrometry
Radial velocity (Rv)−5.2[6] km/s
Proper motion (μ) RA: +10.102[2] mas/yr
Dec.: −0.825[2] mas/yr
Parallax (π)4.7730 ± 0.1052 mas[2]
Distance680 ± 20 ly
(210 ± 5 pc)
Absolute magnitude (MV)−2.12[7]
Details
Mass6.7[8] M☉
Radius6.2[9] R☉
Luminosity704[8] L☉
Surface gravity (log g)3.95[8] cgs
Temperature12,014[8] K
Metallicity [Fe/H]−0.20[10] dex
Rotation9.3 d[11]
Rotational velocity (v sin i)17[10] km/s
Age165[12] Myr
Other designations
21 Aql, V1288 Aql, BD+02°3824, FK5 3537, HD 179761, HIP 94477, HR 7287, SAO 124408, WDS J19137+0218A[13]
Database references
SIMBADdata

The stellar classification of this star is B8 II-III, with the luminosity class of II-III suggesting that the spectrum displays elements of both a giant star and a bright giant. It is a chemically peculiar star of the Mercury-Manganese type (CP3),[10] although some catalogues consider that status to be doubtful.[15] This is a probable Alpha2 Canum Venaticorum variable that ranges in visual magnitude from 5.06 down to 5.16.[3] The star is radiating 704 times the luminosity of the Sun from its photosphere at an effective temperature of 12,014 K; this gives it the blue-white glow of a B-type star.[16]

21 Aquilae is catalogued as an optical double star, having a 12th magnitude companion 37″ away as of 2010. It was first identified as a double star by John Herschel.[17] The companion is a distant background object.[18]

References edit

  1. ^ Veto, B. (May 1980). "Ultraviolet Observations of the Silicon Star HD 179761". Information Bulletin on Variable Stars. 1778 (1): 1. Bibcode:1980IBVS.1778....1V.
  2. ^ a b c d e 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.
  3. ^ a b c Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
  4. ^ Cowley, A. (November 1972). "Spectral classification of the bright B8 stars". Astronomical Journal. 77: 750–755. Bibcode:1972AJ.....77..750C. doi:10.1086/111348.
  5. ^ a b Stepien, K. (December 1968). "Photometric behavior of magnetic stars". Astrophysical Journal. 154: 945. Bibcode:1968ApJ...154..945S. doi:10.1086/149815.
  6. ^ a b Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". In Batten, Alan Henry; Heard, John Frederick (eds.). Proceedings from IAU Symposium no. 30. Determination of Radial Velocities and Their Applications. Vol. 30. University of Toronto: International Astronomical Union. p. 57. Bibcode:1967IAUS...30...57E.
  7. ^ 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.
  8. ^ a b c d Fouesneau, M.; Andrae, R.; Dharmawardena, T.; Rybizki, J.; Bailer-Jones, C. A. L.; Demleitner, M. (2022). "Astrophysical parameters from Gaia DR2, 2MASS, and AllWISE". Astronomy and Astrophysics. 662: A125. arXiv:2201.03252. Bibcode:2022A&A...662A.125F. doi:10.1051/0004-6361/202141828. S2CID 245837778.
  9. ^ Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (20 December 2021). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146. eISSN 1432-0746. ISSN 0004-6361.
  10. ^ a b c Ghazaryan, S.; et al. (November 2018). "New catalogue of chemically peculiar stars, and statistical analysis". Monthly Notices of the Royal Astronomical Society. 480 (3): 2953–2962. arXiv:1807.06902. Bibcode:2018MNRAS.480.2953G. doi:10.1093/mnras/sty1912. S2CID 119062018.
  11. ^ Oelkers, Ryan J.; Rodriguez, Joseph E.; Stassun, Keivan G.; Pepper, Joshua; Somers, Garrett; Kafka, Stella; Stevens, Daniel J.; Beatty, Thomas G.; Siverd, Robert J.; Lund, Michael B.; Kuhn, Rudolf B.; James, David; Gaudi, B. Scott (2018). "Variability Properties of Four Million Sources in the TESS Input Catalog Observed with the Kilodegree Extremely Little Telescope Survey". The Astronomical Journal. 155 (1): 39. arXiv:1711.03608. Bibcode:2018AJ....155...39O. doi:10.3847/1538-3881/aa9bf4. S2CID 119515775.
  12. ^ Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. ISSN 0320-0108. S2CID 118345778.
  13. ^ "21 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-05.
  14. ^ 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.
  15. ^ Renson, P.; Manfroid, J. (May 2009). "Catalogue of Ap, HgMn and Am stars". Astronomy and Astrophysics. 498 (3): 961–966. Bibcode:2009A&A...498..961R. doi:10.1051/0004-6361/200810788.
  16. ^ . Australia Telescope, Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. December 21, 2004. Archived from the original on March 18, 2012. Retrieved 2012-01-16.
  17. ^ Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Retrieved 2015-07-22.
  18. ^ 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.

External links edit

  • Image 21 Aquilae
  • HR 7287
  • CCDM 19137+0218
  • V1288 Aquilae

April 12, 2024
aquilae, solitary, variable, star, equatorial, constellation, aquila, variable, star, designation, v1288, flamsteed, designation, this, object, visible, naked, blue, white, hued, star, with, baseline, apparent, visual, magnitude, about, star, located, distance. 21 Aquilae is a solitary 14 variable star in the equatorial constellation of Aquila It has the variable star designation V1288 Aql 21 Aquilae is its Flamsteed designation This object is visible to the naked eye as a dim blue white hued star with a baseline apparent visual magnitude of about 5 1 The star is located at a distance of around 680 light years 210 parsecs from Earth give or take a 20 light year margin of error It is moving closer to the Earth with a heliocentric radial velocity of 5 km s 6 21 AquilaeAn ultraviolet band light curve for V1288 Aquilae adapted from Veto 1980 1 Observation dataEpoch J2000 Equinox J2000Constellation AquilaRight ascension 19h 13m 42 70120s 2 Declination 02 17 37 3103 2 Apparent magnitude V 5 06 5 16 3 CharacteristicsSpectral type B8II III Hg 4 U B color index 0 399 5 B V color index 0 065 5 Variable type a2 CVn 3 AstrometryRadial velocity Rv 5 2 6 km sProper motion m RA 10 102 2 mas yr Dec 0 825 2 mas yrParallax p 4 7730 0 1052 mas 2 Distance680 20 ly 210 5 pc Absolute magnitude MV 2 12 7 DetailsMass6 7 8 M Radius6 2 9 R Luminosity704 8 L Surface gravity log g 3 95 8 cgsTemperature12 014 8 KMetallicity Fe H 0 20 10 dexRotation9 3 d 11 Rotational velocity v sin i 17 10 km sAge165 12 MyrOther designations21 Aql V1288 Aql BD 02 3824 FK5 3537 HD 179761 HIP 94477 HR 7287 SAO 124408 WDS J19137 0218A 13 Database referencesSIMBADdataThe stellar classification of this star is B8 II III with the luminosity class of II III suggesting that the spectrum displays elements of both a giant star and a bright giant It is a chemically peculiar star of the Mercury Manganese type CP3 10 although some catalogues consider that status to be doubtful 15 This is a probable Alpha2 Canum Venaticorum variable that ranges in visual magnitude from 5 06 down to 5 16 3 The star is radiating 704 times the luminosity of the Sun from its photosphere at an effective temperature of 12 014 K this gives it the blue white glow of a B type star 16 21 Aquilae is catalogued as an optical double star having a 12th magnitude companion 37 away as of 2010 It was first identified as a double star by John Herschel 17 The companion is a distant background object 18 References edit Veto B May 1980 Ultraviolet Observations of the Silicon Star HD 179761 Information Bulletin on Variable Stars 1778 1 1 Bibcode 1980IBVS 1778 1V a b c d e 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 amp A 674A 1G doi 10 1051 0004 6361 202243940 S2CID 244398875 Gaia DR3 record for this source at VizieR a b c Samus N N et al 2017 General Catalogue of Variable Stars Astronomy Reports 5 1 61 1 80 88 Bibcode 2017ARep 61 80S doi 10 1134 S1063772917010085 S2CID 125853869 Cowley A November 1972 Spectral classification of the bright B8 stars Astronomical Journal 77 750 755 Bibcode 1972AJ 77 750C doi 10 1086 111348 a b Stepien K December 1968 Photometric behavior of magnetic stars Astrophysical Journal 154 945 Bibcode 1968ApJ 154 945S doi 10 1086 149815 a b Evans D S June 20 24 1966 The Revision of the General Catalogue of Radial Velocities In Batten Alan Henry Heard John Frederick eds Proceedings from IAU Symposium no 30 Determination of Radial Velocities and Their Applications Vol 30 University of Toronto International Astronomical Union p 57 Bibcode 1967IAUS 30 57E 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 d Fouesneau M Andrae R Dharmawardena T Rybizki J Bailer Jones C A L Demleitner M 2022 Astrophysical parameters from Gaia DR2 2MASS and AllWISE Astronomy and Astrophysics 662 A125 arXiv 2201 03252 Bibcode 2022A amp A 662A 125F doi 10 1051 0004 6361 202141828 S2CID 245837778 Kervella Pierre Arenou Frederic Thevenin Frederic 20 December 2021 Stellar and substellar companions from Gaia EDR3 Astronomy amp Astrophysics 657 A7 arXiv 2109 10912 Bibcode 2022A amp A 657A 7K doi 10 1051 0004 6361 202142146 eISSN 1432 0746 ISSN 0004 6361 a b c Ghazaryan S et al November 2018 New catalogue of chemically peculiar stars and statistical analysis Monthly Notices of the Royal Astronomical Society 480 3 2953 2962 arXiv 1807 06902 Bibcode 2018MNRAS 480 2953G doi 10 1093 mnras sty1912 S2CID 119062018 Oelkers Ryan J Rodriguez Joseph E Stassun Keivan G Pepper Joshua Somers Garrett Kafka Stella Stevens Daniel J Beatty Thomas G Siverd Robert J Lund Michael B Kuhn Rudolf B James David Gaudi B Scott 2018 Variability Properties of Four Million Sources in the TESS Input Catalog Observed with the Kilodegree Extremely Little Telescope Survey The Astronomical Journal 155 1 39 arXiv 1711 03608 Bibcode 2018AJ 155 39O doi 10 3847 1538 3881 aa9bf4 S2CID 119515775 Gontcharov G A December 2012 Dependence of kinematics on the age of stars in the solar neighborhood Astronomy Letters 38 12 771 782 arXiv 1606 08814 Bibcode 2012AstL 38 771G doi 10 1134 S1063773712120031 ISSN 0320 0108 S2CID 118345778 21 Aql SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2019 06 05 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 Renson P Manfroid J May 2009 Catalogue of Ap HgMn and Am stars Astronomy and Astrophysics 498 3 961 966 Bibcode 2009A amp A 498 961R doi 10 1051 0004 6361 200810788 The Colour of Stars Australia Telescope Outreach and Education Commonwealth Scientific and Industrial Research Organisation December 21 2004 Archived from the original on March 18 2012 Retrieved 2012 01 16 Mason B D et al 2014 The Washington Visual Double Star Catalog The Astronomical Journal 122 6 3466 3471 Bibcode 2001AJ 122 3466M doi 10 1086 323920 Retrieved 2015 07 22 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 amp A 674A 1G doi 10 1051 0004 6361 202243940 S2CID 244398875 Gaia DR3 record for this source at VizieR External links editImage 21 Aquilae HR 7287 CCDM 19137 0218 V1288 Aquilae Retrieved from https en wikipedia org w index php title 21 Aquilae amp oldid 1186912410, wikipedia, wiki, book, books, library,

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