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Alpha Scuti

From Wikipedia, the free encyclopedia
Star in the constellation Scutum
α Scuti
Location of α Scuti (circled)
Observation data
Epoch J2000      Equinox J2000
ConstellationScutum[1]
Right ascension18h 35m 12.42776s[2]
Declination−08° 14′ 38.6529″[2]
Apparent magnitude (V)3.83[3]
Characteristics
Spectral typeK3III[4]
U−Bcolor index+1.53[3]
B−Vcolor index+1.34[3]
Astrometry
Radial velocity (Rv)+36.50[5] km/s
Proper motion (μ)RA: −17.00[2]mas/yr
Dec.: −313.52[2]mas/yr
Parallax (π)16.38±0.22 mas[2]
Distance199 ± 3 ly
(61.1 ± 0.8 pc)
Absolute magnitude (MV)−0.08[1]
Details
Mass1.33[6] M
Radius20[6] R
Luminosity186[1] L
Surface gravity (log g)1.96[6] cgs
Temperature4,315[7] K
Metallicity[Fe/H]−0.04[1] dex
Rotational velocity (v sin i)1.7[8] km/s
Other designations
α Sct,BD−08°4638,FK5 1482,GC 25385,HD 171443,HIP 91117,HR 6973,LTT 7377,NSV 11056,SAO 142408
Database references
SIMBADdata

Alpha Scuti,Latinized from α Scuti, is an orange-huedstar in the southernconstellation ofScutum. Originally part of theAquila constellation, Alpha Scuti was a latter designation of1 Aquilae.[9] It is faintly visible to the naked eye with anapparent visual magnitude of 3.83.[3] Based upon an annualparallax shift of 16.38 mas as seen from the Earth,[2] it is located around 199 light years from the Sun. It is moving away from the Sun with aradial velocity of +36.5 km/s.[5]

Properties

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With astellar classification of K3 III,[4] thespectrum indicates it is anevolvedgiant star oftype K. Alpha Scuti is a suspectedvariable star with magnitude range reported as 3.81 to 3.87.[10] The star has an estimated 1.33 times themass of the Sun, but the outer envelope has expanded to 20 times theSun's radius.[6] It is radiating 186[1] times theSun's luminosity from its inflatedphotosphere at aneffective temperature of 4,315 K.[7]

References

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  1. ^abcdeAnderson, 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. XHIP record for this object atVizieR.
  2. ^abcdefVan Leeuwen, F. (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.Vizier catalog entry
  3. ^abcdDucati, 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.
  4. ^abKeenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars".The Astrophysical Journal Supplement Series.71: 245.Bibcode:1989ApJS...71..245K.doi:10.1086/191373.
  5. ^abMassarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey (2008)."Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity".The Astronomical Journal.135 (1):209–231.Bibcode:2008AJ....135..209M.doi:10.1088/0004-6256/135/1/209.
  6. ^abcdAllende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures".Astronomy and Astrophysics.352:555–562.arXiv:astro-ph/9911002.Bibcode:1999A&A...352..555A.Vizier catalog entry
  7. ^abMartínez, M. Isabel Pérez; Schröder, K.-P.; Cuntz, M. (2011)."The basal chromospheric Mg ii h+k flux of evolved stars: Probing the energy dissipation of giant chromospheres".Monthly Notices of the Royal Astronomical Society.414 (1):418–427.arXiv:1102.4832.Bibcode:2011MNRAS.414..418P.doi:10.1111/j.1365-2966.2011.18421.x.S2CID 59268230.Vizier catalog entry
  8. ^De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars".Astronomy & Astrophysics.561: A126.arXiv:1312.3474.Bibcode:2014A&A...561A.126D.doi:10.1051/0004-6361/201220762.S2CID 54046583.Vizier catalog entry
  9. ^Wagman, M. (August 1987). "Flamsteed's Missing Stars".Journal for the History of Astronomy.18 (3): 212.Bibcode:1987JHA....18..209W.doi:10.1177/002182868701800305.S2CID 118445625.
  10. ^Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)".VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S.1.Bibcode:2009yCat....102025S.

External links

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