Xi Cassiopeiae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 00h 42m 03.892s[1] |
| Declination | +50° 30′ 45.12″[1] |
| Apparent magnitude (V) | +4.81[2] |
| Characteristics | |
| Spectral type | B2.5 V[3] or B3 IV[4] |
| U−B color index | −0.60[2] |
| B−V color index | −0.11[2] |
| Astrometry | |
| Radial velocity (Rv) | −10.6±7.4[5] km/s |
| Proper motion (μ) | RA: +16.126 mas/yr[1] Dec.: −6.050 mas/yr[1] |
| Parallax (π) | 2.9022±0.2368 mas[1] |
| Distance | 1,120 ± 90 ly (340 ± 30 pc) |
| Absolute magnitude (MV) | −0.42[6] |
| Orbit[7] | |
| Period (P) | 940.2 d |
| Eccentricity (e) | 0.4 |
| Periastron epoch (T) | 2441738 JD |
| Argument of periastron (ω) (secondary) | 119° |
| Semi-amplitude (K1) (primary) | 11.90 km/s |
| Details | |
| Mass | 10.1±0.1[8] M☉ |
| Radius | 4.5[9] R☉ |
| Luminosity | 2,873[10] L☉ |
| Surface gravity (log g) | 3.571±0.032[11] cgs |
| Temperature | 15,585±250[11] K |
| Rotational velocity (v sin i) | 139±7[12] km/s |
| Age | 19[11] Myr |
| Other designations | |
| ξ Cas, 19 Cas, BD+49°164, FK5 2046, HD 3901, HIP 3300, HR 179, SAO 21637[13] | |
| Database references | |
| SIMBAD | data |
Xi Cassiopeiae is a blue-white hued binary star[7] system in the northern constellation of Cassiopeia. Its name is a Bayer designation that is Latinized from ξ Cassiopeiae, and abbreviated or ξ Cas. This system has an apparent visual magnitude of +4.81[2] and thus is faintly visible to the naked eye. Based upon an annual parallax shift of 2.90 mas as seen from Earth,[1] this system is located roughly 1,120 light-years (340 pc) from the Sun. At that distance, the visual magnitude of the system is diminished by an extinction factor of 0.20 due to interstellar dust.[6] It is advancing in the general direction of the Sun with a radial velocity of roughly −10.6 km/s.[5]
This is a single-lined spectroscopic binary star system with an orbital period of 940.2 days and an eccentricity of 0.4.[7] The visible component has the spectrum of a B-type main-sequence star with a stellar classification of B2.5 V.[3] It has an estimated 10.1[8] times the mass of the Sun and around 4.5[9] times the Sun's radius. At the age of 19[11] million years, it has a high rate of rotation with a projected rotational velocity of about 139 km/s.[12] The star is radiating 2,873[10] times the Sun's luminosity from its photosphere at an effective temperature of around 15,585 K.[11]
References
- ^ a b c d e 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.
- ^ a b c d Crawford, D. L.; et al. (1971), "Four-color, H-beta, and UBV photometry for bright B-type stars in the northern hemisphere", The Astronomical Journal, 76: 1058, Bibcode:1971AJ.....76.1058C, doi:10.1086/111220.
- ^ a b Lesh, Janet Rountree (December 1968), "The Kinematics of the Gould Belt: an Expanding Group?", Astrophysical Journal Supplement, 17: 371, Bibcode:1968ApJS...17..371L, doi:10.1086/190179
- ^ Negueruela, I.; et al. (2024), "The IACOB project: XII. New grid of northern standards for the spectral classification of B-type stars", Astronomy and Astrophysics, 690, arXiv:2407.04163, Bibcode:2024A&A...690A.176N, doi:10.1051/0004-6361/202449298.
- ^ a b de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ a b Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
- ^ a b c Pourbaix, D.; et al. (2004), "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits", Astronomy & Astrophysics, 424: 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
- ^ a b 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, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
- ^ a b Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy & Astrophysics, 367 (3rd ed.): 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ a b c d e Gullikson, Kevin; et al. (August 2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 13, arXiv:1604.06456, Bibcode:2016AJ....152...40G, doi:10.3847/0004-6256/152/2/40, S2CID 119179065, 40.
- ^ a b Huang, Wenjin; et al. (October 2010), "A Stellar Rotation Census of B Stars: From ZAMS to TAMS", The Astrophysical Journal, 722 (1): 605–619, arXiv:1008.1761, Bibcode:2010ApJ...722..605H, doi:10.1088/0004-637X/722/1/605, S2CID 118532653.
- ^ "ksi Cas", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-08-30.