Astronomy:1 Cassiopeiae
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Short description: Star in the constellation Cassiopeia
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 23h 06m 36.818s[1] |
| Declination | +59° 25′ 11.14″[1] |
| Apparent magnitude (V) | +4.84[2] |
| Characteristics | |
| Spectral type | B0.5 III[3] |
| U−B color index | −0.87 |
| B−V color index | −0.060±0.004[2] |
| Astrometry | |
| Radial velocity (Rv) | −9.1±0.9[2] km/s |
| Proper motion (μ) | RA: 6.94±0.14[1] mas/yr Dec.: −1.95±0.14[1] mas/yr |
| Parallax (π) | 2.89 ± 0.13[1] mas |
| Distance | 1,130 ± 50 ly (350 ± 20 pc) |
| Absolute magnitude (MV) | −2.91[2] |
| Details | |
| Mass | 13.1[4] M☉ |
| Radius | 10.2[5] R☉ |
| Luminosity | 18,200[4] L☉ |
| Surface gravity (log g) | 3.98[4] cgs |
| Temperature | 27,200[4] K |
| Metallicity [Fe/H] | −0.40[6] dex |
| Rotational velocity (v sin i) | 31[7] km/s |
| Age | 5.7±0.1[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
1 Cassiopeiae is a single[10] star in the northern constellation of Cassiopeia, located around 1,130 light years from the Sun.[1] It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of +4.84.[2] This object is moving closer to the Earth with a heliocentric radial velocity of −9 km/s.[2]
The stellar classification of 1 Cassiopeiae is B0.5 III,[3] matching an evolved B-type giant star. It is 5.7[8] million years old with a projected rotational velocity of 31.[7] The star has 13.1[4] times the mass of the Sun and 10.2[5] times the Sun's radius. It is radiating 18,200[4] times the Sun's luminosity from its photosphere at an effective temperature of 27,200 K.[4]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.Vizier catalog entry
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A
- ↑ 3.0 3.1 Zorec, J. et al. (July 2009). "Fundamental parameters of B supergiants from the BCD system. I. Calibration of the (λ_1, D) parameters into Teff". Astronomy and Astrophysics 501 (1): 297–320. doi:10.1051/0004-6361/200811147. Bibcode: 2009A&A...501..297Z.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Fitzpatrick, E. L.; Massa, D. (March 2005), "Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry", The Astronomical Journal 129 (3): 1642–1662, doi:10.1086/427855, Bibcode: 2005AJ....129.1642F
- ↑ 5.0 5.1 Underhill, A. B. et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the Royal Astronomical Society 189 (3): 601–605, doi:10.1093/mnras/189.3.601, Bibcode: 1979MNRAS.189..601U
- ↑ Gies, Douglas R.; Lambert, David L. (March 1992). "Carbon, nitrogen, and oxygen abundances in early B-type stars". Astrophysical Journal, Part 1 387: 673–700. doi:10.1086/171116. Bibcode: 1992ApJ...387..673G.
- ↑ 7.0 7.1 Simón-Díaz, S. et al. (January 2017). "The IACOB project . III. New observational clues to understand macroturbulent broadening in massive O- and B-type stars". Astronomy & Astrophysics 597: 17. doi:10.1051/0004-6361/201628541. A22. Bibcode: 2017A&A...597A..22S.
- ↑ 8.0 8.1 Tetzlaff, N. et al. (January 2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society 410 (1): 190–200. doi:10.1111/j.1365-2966.2010.17434.x. Bibcode: 2011MNRAS.410..190T.
- ↑ "1 Cas". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=1+Cas.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
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