YZ Cassiopeiae

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

Template:Short description

YZ Cas
Template:Location mark
Location of YZ Cassiopeiae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia[1]
A
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 5.653[3]
B
Right ascension Template:RA[4]
Declination Template:DEC[4]
Apparent magnitude (V) 11.23[5]
Characteristics
A
Spectral type A2IV[6] (A1Vm + F2V[7])
U−B Template:Engvar +0.07[5]
B−V Template:Engvar +0.05[5]
Variable type Algol[8]
B
Spectral type F2V[9]
U−B Template:Engvar +0.64[5]
B−V Template:Engvar +0.94[5]
Astrometry
Radial velocity (Rv)+8.90±0.4[10] km/s
Proper motion (μ) RA: −15.07[2] mas/yr
Dec.: −22.17[2] mas/yr
Parallax (π)11.24±0.55 mas[2]
Distance103.8[9] pc
Absolute magnitude (MV)+0.251[7]
Orbit[11]
CompanionTYC 4307-2168-1
Period (P)86 580 yr
Orbit[9]
PrimaryAa
CompanionAb
Period (P)4.467 days
Semi-major axis (a)Template:Solar radius[12]
Eccentricity (e)0.0
Inclination (i)88.332°
Details
Aa
Mass2.308[12] Template:Solar mass
Radius2.547[12] Template:Solar radius
Luminosity41.69[12] Template:Solar luminosity
Surface gravity (log g)3.988[9] cgs
Temperature9,200[12] K
Rotational velocity (v sin i)29.2[9] km/s
Ab
Mass1.325[13] Template:Solar mass
Radius1.359[12] Template:Solar radius
Luminosity3.34[12] Template:Solar luminosity
Surface gravity (log g)4.311[9] cgs
Temperature6,890[13] K
Metallicity [Fe/H]+0.10[13] dex
Rotational velocity (v sin i)15.0[9] km/s
Age490 - 550[9] Myr
Other designations
21 Cassiopeiae, HR 192, BD+74 27, HD 4161, SAO 4216, HIP 3572, GC 891, ADS 624 A, CCDM J00457+7459[14]
Database references
SIMBADdata

Script error: No such module "Check for unknown parameters".

YZ Cassiopeiae (21 Cas) is a star system Script error: No such module "convert". 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.[11] It is faintly visible to the naked eye under good observing conditions.

File:YZCasLightCurve.png
A light curve for YZ Cassiopeiae, plotted from TESS data[15]

The primary star in the YZ Cassiopeiae system is a white subgiant (main sequence) star of spectral type A1Vm and 2.31 solar masses[11] (Template:Solar mass) with a less massive main sequence dwarf star of type F2V[3] and 1.35 Template:Solar mass.[11]

In 1924, Joel Stebbins announced his discovery that the star, then known as 21 Cassiopeiae, is an eclipsing binary.[16] It was given its variable star designation, YZ Cassiopeiae, in 1925.[17] The apparent magnitude of the eclipsing binary varies from 5.65 to 6.05[3] with a period of 4.4672 days.[11] Combined, they appear to have a spectral type of A2IV.[11]

The binary has a dimmer (magnitude 9.7 according to Norton,[18] or 10.5 by SIMBAD) companion of 0.8 Template:Solar mass[11] orbiting with a period of about 86 580 years.[11]

References

<templatestyles src="Reflist/styles.css" />

  1. ↑ Script error: No such module "Citation/CS1".
  2. ↑ a b c d e Script error: No such module "Citation/CS1".
  3. ↑ a b c Jerzy M. Kreiner, Chun-Hwey Kim, Il-Seong Nha. YZ CAS: Atlas of O-C Diagrams of Eclipsing Binary Stars
  4. ↑ a b Script error: No such module "Citation/CS1".
  5. ↑ a b c d e Script error: No such module "Citation/CS1".
  6. ↑ Script error: No such module "Citation/CS1".
  7. ↑ a b Script error: No such module "Citation/CS1".
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ a b c d e f g h Script error: No such module "Citation/CS1".
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ a b c d e f g h Tokovinin 1997-1999. J/A+AS/124/75. Multiple star catalogue (MSC)
  12. ↑ a b c d e f g Script error: No such module "Citation/CS1".
  13. ↑ a b c Script error: No such module "Citation/CS1".
  14. ↑ Template:Cite simbad
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ Script error: No such module "Citation/CS1".
  17. ↑ Script error: No such module "Citation/CS1".
  18. ↑ Script error: No such module "citation/CS1".

Script error: No such module "Check for unknown parameters".

Template:Sky

Template:Stars of Cassiopeia

Retrieved from "http://debianws.lexgopc.com/wiki143/index.php?title=YZ_Cassiopeiae&oldid=7276110"