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SW Andromedae

From Wikipedia, the free encyclopedia
Star in the constellation Andromeda
SW Andromedae
Observation data
Epoch J2000      Equinox J2000
ConstellationAndromeda
Right ascension00h 23m 43.08963s[1]
Declination29° 24′ 03.6265″[1]
Apparent magnitude (V)9.14 to 10.09[2]
Characteristics
Spectral typeA7III[2]
Apparent magnitude (U)10.287±0.20[3][note 1]
Apparent magnitude (B)10.097±0.006[3][note 1]
Apparent magnitude (V)9.692±0.006[3][note 1]
Apparent magnitude (Rc)9.433±0.020[3][note 1]
Apparent magnitude (Ic)9.169±0.008[3][note 1]
Apparent magnitude (J)8.757±0.020[3][note 1]
Apparent magnitude (H)8.590±0.013[3][note 1]
Apparent magnitude (Ks)8.511±0.009[3][note 1]
Variable typeRRab Lyrae[3]
Astrometry
Proper motion (μ)RA: −6.638(29)[1]mas/yr
Dec.: −18.906(26)[1]mas/yr
Parallax (π)1.77±0.26 mas[1]
Distanceapprox. 1,800 ly
(approx. 560 pc)
Absolute magnitude (MV)0.710[4]
Details[4]
Mass0.26±0.04 M
Radius4.51–5.05 R
Luminosity39.8±4 L
Temperature6644 K
Other designations
SW And,BD+28 54,HIP 1878,TYC 1737-1702-1,2MASS J00234308+2924036[5]
Database references
SIMBADdata
Phase-foldedlight curve of the RR Lyrae variable SW Andromedae recorded by NASA'sTransiting Exoplanet Survey Satellite (TESS)
Light curve of SW AND taken through a J/C V band filter

SW Andromedae is avariable star in the constellation ofAndromeda. It is classified as anRR Lyrae star, and varies from anapparent magnitude of 10.09 at minimum brightness to a magnitude of 9.14 at maximum brightness with a period of 0.44226 days.[2] It exhibits theBlazhko effect, and its period is decreasing.[6][7]

The discovery of this star byAnnie Jump Cannon was announced in 1907. 461photographic plates, spanning the time interval from November 14, 1889 through November 16, 1906 were examined, and an initial period of 0.49932 days was derived.[8] SW Andromedae was given itsvariable star designation in 1907.[9]

Notes

[edit]
  1. ^abcdefghSince SW Andromedae is a variable star these magnitudes are means sampled over the light curve.

References

[edit]
  1. ^abcdeBrown, 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 atVizieR.
  2. ^abcSW And, database entry, Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.), N. N. Samus, O. V. Durlevich, et al.,CDS IDII/250 Accessed on line 2014-07-02.
  3. ^abcdefghiMonson, Andrew J.; et al. (2017)."Standard Galactic Field RR Lyrae. I. Optical to Mid-infrared Phased Photometry".The Astronomical Journal.153 (3). 96.arXiv:1703.01520.Bibcode:2017AJ....153...96M.doi:10.3847/1538-3881/153/3/96.S2CID 59322123.
  4. ^abBarcza, S.; Benkő, J. M. (2014)."Fundamental parameters of RR Lyrae stars from multicolour photometry and Kurucz atmospheric models – III. SW And, DH Peg, CU Com and DY Peg".Monthly Notices of the Royal Astronomical Society.442 (2):1863–1876.arXiv:1405.4184.Bibcode:2014MNRAS.442.1863B.doi:10.1093/mnras/stu978.S2CID 119182612.
  5. ^"V* SW And".SIMBAD.Centre de données astronomiques de Strasbourg. Retrieved2018-04-21.
  6. ^McNamara, D. H.; Feltz, K. A., Jr. (October 1977)."A photometric study of SW Andromedae".Publications of the Astronomical Society of the Pacific.89:699–703.Bibcode:1977PASP...89..699M.doi:10.1086/130212. Retrieved5 November 2024.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  7. ^Skarka, M. (February 2014)."Bright Blazhko RRab Lyrae stars observed by ASAS and the SuperWASP surveys"(PDF).Astronomy & Astrophysics.562: A90.arXiv:1402.3111.Bibcode:2014A&A...562A..90S.doi:10.1051/0004-6361/201322491. Retrieved5 November 2024.
  8. ^Fleming, Williamina; Cannon, Annie J.; Wells, L. D.; Pickering, Edward C. (January 1907)."Stars Having Peculiar Spectra. 18 New Variable Stars".Harvard College Observatory Circular.124:1–4.Bibcode:1907HarCi.124....1F. Retrieved5 November 2024.
  9. ^Duné; Hartwig; Müller (November 1907)."Benennung von neu entdeckten veränderlichen Sternen".Astronomische Nachrichten.176 (12):181–194.Bibcode:1907AN....176..181..doi:10.1002/asna.19071761202. Retrieved5 November 2024.
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