42 Cassiopeiae

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]

42 Cassiopeiae

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
42 Cas, NSV 590, BD+69°114, GC 2059, HD 10250, HIP 8016, HR 480, SAO 4470[8]
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

1. 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.
2. 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.
3. 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.
4. 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.
5. 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.
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, arXiv:astro-ph/0412542, Bibcode:2005AJ....129.1642F, doi:10.1086/427855, S2CID 119512018.
7. 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.
8. "42 Cas". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-22.
9. 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.
10. 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.