YZ Cassiopeiae

Starbox begin
name=YZ Cas Starbox observe
epoch=J2000
constell=Cassiopeia
ra=RA|00|45|39.0777cite web
url=http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=V*+YZ+Cas
title=SIMBAD query result: V* YZ Cas -- Eclipsing binary of Algol type
publisher=Centre de Données astronomiques de Strasbourg
accessdate=2008-09-05 ]
dec=DEC|+74|59|17.063
appmag_v=5.6/6.0cite book
last=Norton |first=Arthur P.
title=Norton's Star Atlas
year=1973 |page=118 |isbn=0-85248-900-5] Starbox character
class=A2IV
b-v=0.067
u-b=
variable=Algol variable Starbox astrometry
radial_v=+8.9±0.9
prop_mo_ra=-14.93
prop_mo_dec=-21.86
parallax=11.24
p_error=0.55
parallax_footnote=
absmag_v= Starbox visbin
reference=Tokovinin 1997-1999. [http://cdsarc.u-strasbg.fr/viz-bin/Cat?J/A%2bAS/124/75#sRM3.4 J/A+AS/124/75] . Multiple star catalogue (MSC)]
name=TYC 4307-2168-1
period=86580
axis=
eccentricity=
inclination=
node=
periarg=
periastron=Starbox catalog
names=21 Cassiopeiae, HR 192, BD+74 27, HD 4161, SAO 4216, HIP 3572, GC 891, ADS 624 A, CCDM J00457+7459

YZ Cassiopeiae (21 Cas) is a star system 89 parsecs (290 light years) away from Earth, in the constellation Cassiopeia. It comprises three stars: an eclipsing Algol-type binary and a visually fainter star about 3000 AU distant.

The primary star in the Cassiopeiae system is a white subgiant (main sequence) star of spectral type A1m and 2.31 solar masses with a less massive main sequence dwarf star of type F2VJerzy M. Kreiner, Chun-Hwey Kim, Il-Seong Nha. [http://www.as.wsp.krakow.pl/o-c/data/getdata.php3?YZ%20cas YZ CAS: Atlas of O-C Diagrams of Eclipsing Binary Stars] ] and 1.35 solar masses. The apparent magnitude of the eclipsing binary varies from 5.65 to 6.05 with a period of 4.4672 days. Combined, they appear to have a spectral type of A2IV.

The binary has a dimmer (magnitude 9.7 according to Norton, or 10.5 by SIMBAD) companion of 0.8 solar mass orbiting with a period of about 86580 years.

References