AO Cassiopeiae

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Template:Short description

AO Cas
Template:Location mark
Location of AO Cas (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 6.07-6.24[3]
Characteristics
Spectral type O8V((f)) + O9.2II[4]
U−B Template:Engvar −0.97[5]
B−V Template:Engvar −0.13[5]
Variable type Eclipsing Variable star[3]
Astrometry
Radial velocity (Rv)−31.10[6] km/s
Proper motion (μ) RA: −2.988[2] mas/yr
Dec.: −2.374[2] mas/yr
Parallax (π)0.7546±0.0579 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−[7]
Orbit[8]
Period (P)3.52348 days
Semi-major axis (a)Template:Solar radius
Eccentricity (e)0
Inclination (i)65.7°
Longitude of the node (Ω)3.10°
Semi-amplitude (K1)
(primary)		143.7 km/s
Semi-amplitude (K2)
(secondary)		230.6 km/s
Details[8]
II
Mass9.65 Template:Solar mass
Radius9.43 Template:Solar radius
Luminosity115,000[9] Template:Solar luminosity
Surface gravity (log g)3.45 cgs
Temperature29,239 K
Rotational velocity (v sin i)120[9] km/s
V
Mass15.59 Template:Solar mass
Radius4.61 Template:Solar radius
Luminosity66,000[9] Template:Solar luminosity
Surface gravity (log g)4.30 cgs
Temperature33,675 K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Rotational velocity (v sin i)130[9] km/s
Other designations
Pearce's Star,[10] AO Cas, HR 65, BD+50°46, HD 1337, SAO 21273, HIP 1415
Database references
SIMBADdata

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AO Cassiopeiae, also known as Pearce's Star, is a binary system composed of an O8 main sequence star and an O9.2 bright giant that respectively weigh anywhere between 20.30 and 57.75 times and 14.8 and 31.73 times the mass of the Sun.[11]

File:AOCasLightCurve.png
A light curve for AO Cassiopeiae, plotted from Hipparcos data

The AO Cas system is an eclipsing binary with a period of roughly 3.5 days, with the apparent magnitude ranging between 6.07 and 6.24.[12] Stars of this brightness are generally just visible to the unaided eye in dark skies in semirural locations.[13] The component stars are so close to each other they are ellipsoidal (egg-shaped).[14] AO Cas is considered a contact binary, with both stars at or near their Roche lobes.[3]

References

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  2. ↑ a b c d e Template:Cite Gaia DR3
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  5. ↑ a b Script error: No such module "Citation/CS1".
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  7. ↑ Script error: No such module "Citation/CS1".
  8. ↑ a b Script error: No such module "Citation/CS1".
  9. ↑ a b c d Script error: No such module "Citation/CS1".
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "Citation/CS1".
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  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".

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External links

Template:Stars of Cassiopeia

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