SW Andromedae

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]

SW Andromedae
Observation data
Epoch J2000      Equinox J2000
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
Spectral type A7III[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 type RRab 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-folded light curve of the RR Lyrae variable SW Andromedae recorded by NASA's Transiting Exoplanet Survey Satellite (TESS)
Light curve of SW AND taken through a J/C V band filter

Notes
  1. Since SW Andromedae is a variable star these magnitudes are means sampled over the light curve.

References
  1. 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.
  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. Monson, 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. 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. 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. Retrieved 2018-04-21.


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