SW Andromedae

SW Andromedae
Observation data
Epoch J2000      Equinox ICRS
Constellation Andromeda
Right ascension 00h 23m 43.08963s
Declination +29° 24′ 03.6265″
Apparent magnitude (V) 9.14 to 10.09
Characteristics
Evolutionary stage horizontal branch
Spectral type A7III
Apparent magnitude (U) 10.287±0.20
Apparent magnitude (B) 10.097±0.006
Apparent magnitude (V) 9.692±0.006
Apparent magnitude (Rc) 9.433±0.020
Apparent magnitude (Ic) 9.169±0.008
Apparent magnitude (J) 8.757±0.020
Apparent magnitude (H) 8.590±0.013
Apparent magnitude (Ks) 8.511±0.009
Variable type RRab Lyrae
Astrometry
Proper motion (μ) RA: −6.638(29) mas/yr
Dec.: −18.906(26) mas/yr
Parallax (π)1.9615±0.0284 mas
Distance1,660 ± 20 ly
(510 ± 7 pc)
Absolute magnitude (MV)0.710
Details
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
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. It exhibits the Blazhko effect, and its period is decreasing.

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. SW Andromedae was given its variable star designation in 1907.

Notes

  1. 1 2 3 4 5 6 7 8 Since SW Andromedae is a variable star these magnitudes are means sampled over the light curve.

References

  1. 1 2 3 4 5 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.
  2. 1 2 3 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. arXiv:1110.0548. Bibcode:2011ApJS..197...29F. doi:10.1088/0067-0049/197/2/29.
  4. 1 2 3 4 5 6 7 8 9 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.
  5. 1 2 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.
  6. ↑ "V* SW And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-04-21.
  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. Bibcode:1977PASP...89..699M. doi:10.1086/130212.
  8. ↑ Skarka, M. (February 2014). "Bright Blazhko RRab Lyrae stars observed by ASAS and the SuperWASP surveys". Astronomy & Astrophysics. 562: A90. arXiv:1402.3111. Bibcode:2014A&A...562A..90S. doi:10.1051/0004-6361/201322491.
  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. Bibcode:1907AN....176..181.. doi:10.1002/asna.19071761202.