Astronomy:SW Andromedae

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Short description: Star in the constellation Andromeda
SW Andromedae
Observation data
Equinox J2000.0]] (ICRS)
Constellation Andromeda
Right ascension  00h 23m 43.08963s[1]
Declination +29° 24′ 03.6265″[1]
Apparent magnitude (V) 9.14 to 10.09[2]
Characteristics
Evolutionary stage horizontal branch[3]
Spectral type A7III[2]
Apparent magnitude (U) 10.287±0.20[4][note 1]
Apparent magnitude (B) 10.097±0.006[4][note 1]
Apparent magnitude (V) 9.692±0.006[4][note 1]
Apparent magnitude (Rc) 9.433±0.020[4][note 1]
Apparent magnitude (Ic) 9.169±0.008[4][note 1]
Apparent magnitude (J) 8.757±0.020[4][note 1]
Apparent magnitude (H) 8.590±0.013[4][note 1]
Apparent magnitude (Ks) 8.511±0.009[4][note 1]
Variable type RRab Lyrae[4]
Astrometry
Proper motion (μ) RA: −6.638(29)[1] mas/yr
Dec.: −18.906(26)[1] mas/yr
Parallax (π)1.9615 ± 0.0284[1] mas
Distance1,660 ± 20 ly
(510 ± 7 pc)
Absolute magnitude (MV)0.710[5]
Details[5]
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[6]
Database references
SIMBADdata

SW Andromedae is a variable star in the constellation of Andromeda. It is classified as an RR Lyrae star, and varies from an apparent 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 the Blazhko effect, and its period is decreasing.[7][8]

The discovery of this star by Annie Jump Cannon was announced in 1907. 461 photographic 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.[9] SW Andromedae was given its variable star designation in 1907.[10]

Notes

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Since SW Andromedae is a variable star these magnitudes are means sampled over the light curve.

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 SW And, database entry, Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.), N. N. Samus, O. V. Durlevich, et al., CDS ID II/250 Accessed on line 2014-07-02.
  3. ↑ For, Bi-Qing; Sneden, Christopher; Preston, George W. (2011). "The Chemical Compositions of Variable Field Horizontal-branch Stars: RR Lyrae Stars". The Astrophysical Journal Supplement Series 197 (2): 29. doi:10.1088/0067-0049/197/2/29. Bibcode: 2011ApJS..197...29F. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 Monson, Andrew J. et al. (2017). "Standard Galactic Field RR Lyrae. I. Optical to Mid-infrared Phased Photometry". The Astronomical Journal 153 (3): 96. doi:10.3847/1538-3881/153/3/96. Bibcode: 2017AJ....153...96M. 
  5. ↑ 5.0 5.1 Barcza, 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. doi:10.1093/mnras/stu978. Bibcode: 2014MNRAS.442.1863B. 
  6. ↑ "V* SW And". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+SW+And. 
  7. ↑ 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. doi:10.1086/130212. Bibcode: 1977PASP...89..699M. 
  8. ↑ Skarka, M. (February 2014). "Bright Blazhko RRab Lyrae stars observed by ASAS and the SuperWASP surveys". Astronomy & Astrophysics 562: A90. doi:10.1051/0004-6361/201322491. Bibcode: 2014A&A...562A..90S. 
  9. ↑ 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. 
  10. ↑ Duné; Hartwig; Müller (November 1907). "Benennung von neu entdeckten veränderlichen Sternen". Astronomische Nachrichten 176 (12): 181–194. doi:10.1002/asna.19071761202. Bibcode: 1907AN....176..181.. 




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