42 Cassiopeiae is a possible binary star[9] system in the northern circumpolar constellation of Cassiopeia. It is visible to the naked eye as a dim, blue-white hued star with a baseline apparent visual magnitude of +5.18. The system is located approximately 291 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +7 km/s.[2]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 01h 42m 55.86184s[1] |
| Declination | +70° 37′ 21.09002″[1] |
| Apparent magnitude (V) | +5.18[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | B9 V[4] |
| B−V color index | −0.022±0.002[2] |
| Variable type | suspected β Per[5] |
| Astrometry | |
| Radial velocity (Rv) | +6.6±2.9[2] km/s |
| Proper motion (μ) | RA: +76.763[1] mas/yr Dec.: −13.955[1] mas/yr |
| Parallax (π) | 11.2028 ± 0.1432 mas[1] |
| Distance | 291 ± 4 ly (89 ± 1 pc) |
| Absolute magnitude (MV) | 0.53[2] |
| Details | |
| Mass | 2.68±0.04[3] M☉ |
| Radius | 2.63±0.13[6] R☉ |
| Luminosity | 66.12[2] L☉ |
| Surface gravity (log g) | 3.98±0.04[6] cgs |
| Temperature | 10,141±61[6] K |
| Rotational velocity (v sin i) | 149[3] km/s |
| Age | 67+188 −57[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is classified as a suspected eclipsing binary of the Algol type,[5] with a period of 16.77 days and a magnitude decrease of 0.3.[10] The primary is a B-type main-sequence star with a stellar classification of B9V.[4] It is roughly 67[7] million years old and is spinning with a projected rotational velocity of 149 km/s.[3] The star has 2.7[3] times the mass of the Sun and 2.6[6] times the Sun's radius. It is radiating 66[2] times the luminosity of the Sun from its photosphere at an effective temperature of 10,141 K.[6]
References
edit- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e f g Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b c d e Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ a b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- ^ a b Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, GCVS 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
- ^ a b c d e 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, arXiv:astro-ph/0412542, Bibcode:2005AJ....129.1642F, doi:10.1086/427855, S2CID 119512018.
- ^ a b Gullikson, Kevin; et al. (January 2016), "Direct Spectral Detection: An Efficient Method to Detect and Characterize Binary Systems", The Astronomical Journal, 151 (1): 16, arXiv:1511.05148, Bibcode:2016AJ....151....3G, doi:10.3847/0004-6256/151/1/3, S2CID 119305418, 3.
- ^ "42 Cas". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-22.
- ^ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ Hoffleit, Dorrit (1996), "A Catalogue of Correlations Between Eclipsing Binaries and Other Categories of Double Stars", The Journal of the American Association of Variable Star Observers, 24 (2): 105–116, Bibcode:1996JAVSO..24..105H.