WZ Cephei

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WZ Cephei
Observation data Epoch J2000 Equinox J2000
Celestia 1.6.1's impression of WZ Cephei, eclipsing binary of W UMa-type.
Constellation	Cepheus
Right ascension	23^h 22^m 24.215^s
Declination	+72° 54′ 56.70″
Apparent magnitude (V)	+11.22
Characteristics
Spectral type	F5V+F5V
Variable type	W Ursae Majoris-type
Astrometry

Distance	880.2 ly (270^[1] pc)

Details

Mass	1.1/0.83 `M`_☉
Radius	1.4/0.82 `R`_☉
Luminosity	3/1 `L`_☉
Temperature	6400 K

Orbit
Period (P)	0.00114 yr
Semi-major axis (a)	0.013 AU
Eccentricity (e)	0.0
Inclination (i)	86.2^[2]°
Other designations
WZ Cep, 2MASS J23222421+7254566, 1RXS J232216.6+725505
Database references
SIMBAD	data

WZ Cephei is an eclipsing binary star of W Ursae Majoris-type in the constellation of Cepheus, located 880 light years away from the Sun. The stars orbit around a common orbital barycenter every 0.41744 days (slightly over 10 hours). Timing analyses have revealed the possible presence of a third low-mass stellar companion in a wide orbit.^[3]

A light curve for WZ Cephei, plotted from *TESS* data^[4]

Presence of a third body

According to Zhu & Qian (2009) a third low-mass object of stellar nature could be responsible of orbital period variations observed for WZ Cep with a periodicity of roughly 32 years.^[3] Such a companion would yield a minimum mass of 0.17 Solar masses and be located 26.6 Astronomical Units (nearly the same orbital separation of Neptune in Solar System) from the eclipsing binary. The star could likely turn out a Proxima Centauri-analog, with inferred luminosity 3.7 percent that of Sun and 20 percent of its radius, according to mass-radius relationship.

References

^ Geske; Gettel, S. J.; McKay, T. A. (2006). "A ROSAT Survey of Contact Binary Stars". The Astronomical Journal. 131 (1): 633–637. arXiv:astro-ph/0509820. Bibcode:2006AJ....131..633G. doi:10.1086/498018. S2CID 7756046.
^ Djurasevic; Zakirov, M.; Hojaev, A.; Arzumanyants, G. (1998). "Analysis of the activity of the eclipsing binary WZ Cephei". Astronomy and Astrophysics Supplement. 131 (1): 17–23. Bibcode:1998A&AS..131...17D. doi:10.1051/aas:1998248.
^ ^a ^b Zhu & Qian (2009). "WZ Cephei: A Close Binary at the Beginning of Contact Phase". The Astronomical Journal. 138 (6): 2002–2006. Bibcode:2009AJ....138.2002Z. doi:10.1088/0004-6256/138/6/2002.
^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.

Constellation of Cepheus

Stars

Bayer	α (Alderamin) β (Alfirk) γ (Errai) δ ε ζ η θ ι κ λ μ (Garnet Star) ν ξ (Kurhah) ο π ρ¹ ρ²
Flamsteed	7 9 11 14 16 19 24 2 UMi
Variable	AR T V W RW VV VW WZ DH DO MY PV S SS ST U V354 V381 V419
HR	597 881 7955 8281 8442 8702 8748 8938 9038
HD	1 197911 204521
Other	Gliese 809 WISE 0313+7807 WR 156 IRAS 23077+6707

Exoplanets	γ Cephei Ab (Tadmor) TOI-1431 b

Star
clusters

NGC	188 6939 7023 7129 7142 7160 7380 7419 7429 7510
Other	Palomar 1

Nebulae

NGC	NGC 40 NGC 7129 NGC 7139 NGC 7354 NGC 7538 NGC 7822
Other	Seahorse Nebula Elephant's Trunk Nebula Ghost Nebula Gyulbudaghian's Nebula IC 1396 Iris Nebula L1157 S 155 SSTGFLS J222557+601148

Galaxies

NGC	2276 2300 6952
Other	3C 61.1 S5 0014+81 NVSS 2146+82 UGC 11861

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