Astronomy:HD 223960
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Short description: Star in the constellation Cassiopeia
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cassiopeia[1] |
| Right ascension | Template:Ra[2] |
| Declination | +60° 51′ 12.2438″[2] |
| Characteristics | |
| Evolutionary stage | blue supergiant |
| Spectral type | B9Ia[3] |
| U−B color index | −0.050[4] |
| B−V color index | +0.715[4] |
| Variable type | α Cyg[5] |
| Astrometry | |
| Radial velocity (Rv) | −48.1[6] km/s |
| Proper motion (μ) | RA: −3.009[2] mas/yr Dec.: −2.205[2] mas/yr |
| Parallax (π) | 0.3413 ± 0.0147[2] mas |
| Distance | 9,600 ± 400 ly (2,900 ± 100 pc) |
| Absolute magnitude (MV) | −6.9[7] |
| Details | |
| Mass | 19.2[7] M☉ |
| Radius | 89[7] R☉ |
| Luminosity | 315,000+99,000 −75,000[8] L☉ |
| Surface gravity (log g) | 1.48±0.10[8] cgs |
| Temperature | 10,700±200[8] K |
| Metallicity [Fe/H] | +0.02[7] dex |
| Rotational velocity (v sin i) | 32[3] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 223960 is a supergiant star in the northern constellation Cassiopeia. Its brightness varies slightly around apparent magnitude 7 which makes it hard to be seen by the naked eye even from dark skies. Parallax measurements by the Gaia spacecraft suggest a distance of around 9,600 light years.
HD 223960 is tentatively classified as an α Cygni variable; its brightness changes erratically by less than a tenth of a magnitude with a primary period of about two days.[11] It is a hot supergiant star with a luminosity several hundred thousand times higher than the Sun's.
References
- ↑ Anderson, E.; Francis, Ch. (2012-05-01). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 2.0 2.1 2.2 2.3 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.
- ↑ 3.0 3.1 Negueruela, I.; Simón-Díaz, S.; De Burgos, A.; Casasbuenas, A.; Beck, P. G. (2024). "The IACOB project: XII. New grid of northern standards for the spectral classification of B-type stars". Astronomy and Astrophysics 690. doi:10.1051/0004-6361/202449298. Bibcode: 2024A&A...690A.176N.
- ↑ 4.0 4.1 Firnstein, M.; Przybilla, N. (2012). "Quantitative spectroscopy of Galactic BA-type supergiants. I. Atmospheric parameters". Astronomy and Astrophysics 543: A80. doi:10.1051/0004-6361/201219034. Bibcode: 2012A&A...543A..80F.
- ↑ Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports 61 (1): 80. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S.
- ↑ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode: 1953GCRV..C......0W.
- ↑ 7.0 7.1 7.2 7.3 Verdugo, E.; Talavera, A.; Gómez De Castro, A. I. (1999). "Understanding A-type supergiants. II. Atmospheric parameters and rotational velocities of Galactic A-type supergiants". Astronomy and Astrophysics 346: 819. Bibcode: 1999A&A...346..819V.
- ↑ 8.0 8.1 8.2 Georgy, Cyril; Saio, Hideyuki; Meynet, Georges (2021). "Blue supergiants as tests for stellar physics". Astronomy and Astrophysics 650: A128. doi:10.1051/0004-6361/202040105. Bibcode: 2021A&A...650A.128G.
- ↑ "HD 223960". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+223960.
- ↑ EAS (1997). "The HIPPARCOS and TYCHO catalogues". Astrometric and Photometric Star Catalogues Derived from the ESA Hipparcos Space Astrometry Mission. ESA SP Series (Noordwijk, Netherlands: ESA Publications Division) 1200. ISBN 9290923997. Bibcode: 1997HIP...C......0E. https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats. Retrieved 15 March 2025.
- ↑ "V819 Cas". https://www.aavso.org/vsx/index.php?view=detail.top&oid=7150.
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