WZ Andromedae
{{Short description|Eclipsing binary star in the constellation Andromeda}}
{{Starbox begin
| name= WZ Andromedae }}
{{Starbox image
| image = 250px
| caption = The visual band light curve of WZ Andromedae, adapted from Zhang & Zhang (2006)
}}
{{Starbox observe
| epoch=J2000
| ra={{RA|01|01|43.64665}}{{cite DR2|370531677645249792}}
| appmag_v= 11.6 – 12.0 variable
| constell=Andromeda }}
{{Starbox character
| appmag_1_passband = B
| appmag_2_passband = V
| appmag_3_passband = G
| appmag_4_passband = J
| appmag_5_passband = H
| appmag_6_passband = K
| r-i =
| v-r =
| u-b =
| j-h =
| j-k =
| variable = EB
}}
{{Starbox astrometry
| radial_v=
| prop_mo_ra={{val|14.260|0.072}}
| prop_mo_dec={{val|-0.723|0.079}}
| parallax= 1.8634
| p_error= 0.0520
| absmag_v =
| absmag_bol =
}}
{{Starbox orbit
| primary =
| name =
| period = {{val|0.6956612|0.0000001}}
| axis =
| axis_unitless =
| eccentricity =
| inclination =
| node =
| periastron = {{val|2446025.734|0.002}}
| periarg =
| periarg_primary =
| k1 =
| k2 =
}}
{{Starbox detail
| mass = 2.27{{efn|name=mass}}
}}
{{Starbox catalog
| names=2MASS J01014364+3805464, TYC 2799-1250-1}}
{{Starbox reference |
Simbad=WZ+And
}}
{{Starbox end}}
WZ Andromedae (abbreviated to WZ And) is an eclipsing binary star in the constellation Andromeda. Its maximum apparent visual magnitude is 11.6, but drops down to 12.00 during the main eclipse which occurs roughly every 16.7 hours.
Variability
This binary star was found to be variable by Henrietta Leavitt, and shows the usual two eclipses, a main one and a secondary one with a less pronounced drop in magnitude. The period of 16.7 days, however, was found to vary in time without any consolidated trend.
System
In an eclipsing binary system, the 16.7 day period is also the orbital period. The two stars are of spectral type F5 and G3, and they have almost the same mass. They could be so close that mass transfer is occurring in the system, changing the orbital period in time. An alternative explanation could be the presence in the system of two low mass companions with orbital periods of 50 and 70 years, respectively. Their contribution to the luminosity of the system, however, would be negligible (less than 1%), but they would have a large angular separation (45 and 72 mas) from the two main stars.
Notes
{{notes
|notes =
{{efn
| name=mass
| 1 = Total mass of the two main components
}}
}}
References
{{reflist |refs=
[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?V*%20WZ%20And WZ And], database entry, Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.), N. N. Samus, O. V. Durlevich, et al., CDS ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?II/250 II/250] Accessed on line 2018-10-17.
| last1=Høg | first1=E. | last2=Fabricius | first2=C.
| last3=Makarov | first3=V. V. | last4=Urban | first4=S.
| last5=Corbin | first5=T. | last6=Wycoff | first6=G.
| last7=Bastian | first7=U. | last8=Schwekendiek | first8=P.
| last9=Wicenec | first9=A.
| title=The Tycho-2 catalogue of the 2.5 million brightest stars
| journal=Astronomy & Astrophysics
| volume=355 | pages=L27–L30 | year=2000
| bibcode=2000A&A...355L..27H | postscript=. }}
}}
{{Stars of Andromeda}}
{{DEFAULTSORT:WZ Andromedae}}