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.[6][7]
| 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] |
| Distance | approx. 1,800 ly (approx. 560 pc) |
| Absolute magnitude (MV) | 0.710[4] |
| Details[4] | |
| Mass | 0.26±0.04 M☉ |
| Radius | 4.51–5.05 R☉ |
| Luminosity | 39.8±4 L☉ |
| Temperature | 6644 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
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.[8] SW Andromedae was given its variable star designation in 1907.[9]
Notes
editReferences
edit- ^ a b c d e 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.
- ^ a b c 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.
- ^ a b c d e f g h i 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.
- ^ a b 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.
- ^ "V* SW And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-04-21.
- ^ 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. Retrieved 5 November 2024.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ Skarka, M. (February 2014). "Bright Blazhko RRab Lyrae stars observed by ASAS and the SuperWASP surveys" (PDF). Astronomy & Astrophysics. 562: A90. Bibcode:2014A&A...562A..90S. doi:10.1051/0004-6361/201322491. Retrieved 5 November 2024.
- ^ 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. Retrieved 5 November 2024.
- ^ "Benennung von neu entdeckten veränderlichen Sternen". Astronomische Nachrichten. 176 (12): 181–194. November 1907. Bibcode:1907AN....176..181.. doi:10.1002/asna.19071761202. Retrieved 5 November 2024.
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