Pi Cassiopeiae

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Template:Short description

Pi Cassiopeiae
File:Pi cassiopeiae diagram.jpg
Map of the Bayer-designated stars in Cassiopeia. Pi Cassiopeiae is circled.
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cassiopeia
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +4.949[2]
Characteristics
Spectral type A5V[3] + A5V[4]
B−V Template:Engvar +0.171[2]
Variable type Ellipsoidal[5]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[6] km/s
Proper motion (μ) RA: Script error: No such module "val".[1] mas/yr
Dec.: Script error: No such module "val".[1] mas/yr
Parallax (π)18.63±0.32 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+1.30[7]
Orbit[8]
Period (P)1.9642 d
Eccentricity (e)0.00
Periastron epoch (T)2427535.74 JD
Argument of periastron (ω)
(secondary)		0.00°
Semi-amplitude (K1)
(primary)		120.5 km/s
Semi-amplitude (K2)
(secondary)		122.1 km/s
Details
A
Mass1.82[9] Template:Solar mass
Radius1.9[4] Template:Solar radius
Luminosity22[10] Template:Solar luminosity
Surface gravity (log g)4.41[11] cgs
TemperatureScript error: No such module "val".[11] K
Rotational velocity (v sin i)60[4] km/s
Age251[11] Myr
B
Mass1.87[9] Template:Solar mass
Radius1.9[4] Template:Solar radius
Metallicity [Fe/H]{{{metal_fe2}}} dex
Rotational velocity (v sin i)65[4] km/s
Other designations
Template:Odlist[12]
Database references
SIMBADdata

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Pi Cassiopeiae, Latinized from π Cassiopeiae, is a close binary star[8] system in the constellation Cassiopeia. It is visible to the naked eye with an apparent visual magnitude of +4.949.[2] Based upon an annual parallax shift of 18.63 mas as seen from Earth,[1] this system is located about 175 light years from the Sun.

File:PiCasLightCurve.png
A light curve for Pi Cassiopeiae, plotted from TESS data[13]

This is a double-lined spectroscopic binary system with an orbital period of nearly two days in a circular orbit.[8] It is classified as a rotating ellipsoidal variable star and its brightness varies by 0.02 magnitudes with a period of 23.57 hours,[5] which equals half of its orbital period. The spectrum matches that of an A-type main-sequence star with a stellar classification of A5 V.[3] The two stars have similar masses and spectra.[4] A star at a projected separation of Script error: No such module "val". has been identified as a possible white dwarf. It is at the same distance as Pi Cassiopeiae and shares a common proper motion. The age of the white dwarf is calculated to be about 500 million years.[14]

Pi Cassiopeiae has been given the spectral class of kA3hF1mA5, indicating an Am star,[15] but this is now considered doubtful.[16]

References

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

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Template:Stars of Cassiopeia

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