AO Cassiopeiae

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AO Cas A/B
Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia
Right ascension 00h 17m 43.062s[1]
Declination +51° 25′ 59.12″[1]
Apparent magnitude (V) 6.102
Characteristics
Spectral type O9III + O9III
Variable type β Lyr
Astrometry
Radial velocity (Rv) −35.2 km/s
Proper motion (μ) RA: −3.98 ± 0.35[1] mas/yr
Dec.: −1.76 ± 0.29[1] mas/yr
Parallax (π) 1.36 ± 0.44[1] mas
Distance approx. 2,400 ly
(approx. 700 pc)
Details
AO Cas A
Mass 20.30-57.75[2] M
Radius 11.5 / 7.5 R
AO Cas B
Mass 14.8-31.73[2] M
Other designations
AO Cas, Pearce's Star, HR 65, BD+50 46A, HD 1337, SAO 21273, HIP 1415.
Database references
SIMBAD data

AO Cassiopeiae, also known as Pearce's Star, is a binary system, composed of two massive hot blue stars of spectral types O7/O9III and O8/O9III that each weigh anywhere between 20.30 and 57.75 times and 14.8 and 31.73 times the mass of our Sun respectively.[2] The system is an eclipsing binary with a period of roughly 3.5 days, with the apparent magnitude ranging between 6.07 and 6.24.[3] Stars of this brightness are generally just visible to the unaided eye in dark skies in semirural locations.[4]

The component stars are so close to each other they are ellipsoidal (egg-shaped).[5]

References

  1. 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.Vizier catalog entry
  2. 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
  3. Lua error in package.lua at line 80: module 'strict' not found.
  4. Lua error in package.lua at line 80: module 'strict' not found.
  5. [1]

External links


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