Kappa1 Apodis

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Kappa1 Apodis
Template:Location mark
Location of Kappa1 Apodis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Apus[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 5.52[3]
Characteristics
Spectral type B1npe[4] + sdO[5]
U−B Template:Engvar −0.791[3]
B−V Template:Engvar −0.128[3]
Variable type γ Cas[6]
Astrometry
Radial velocity (Rv)+62[7] km/s
Proper motion (μ) RA: +0.996 mas/yr[2]
Dec.: −18.345 mas/yr[2]
Parallax (π)3.0798±0.0717 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−2.47[1]
Orbit[8]
Period (P)Script error: No such module "val".
Semi-major axis (a)Script error: No such module "val".
Eccentricity (e)0 (assumed)
Inclination (i)60±4°
Periastron epoch (T)Script error: No such module "val".
Semi-amplitude (K1)
(primary)		9.09±0.08 km/s
Semi-amplitude (K2)
(secondary)		66.87±1.84 km/s
Details
A
MassScript error: No such module "val".[8] Template:Solar mass
RadiusScript error: No such module "val".[5] Template:Solar radius
Luminosity2,120[1] Template:Solar luminosity
Surface gravity (log g)3.90[9] cgs
Temperature21,500[9] K
Rotational velocity (v sin i)250[5] km/s
AgeScript error: No such module "val".[10] Myr
B
MassScript error: No such module "val".[8] Template:Solar mass
RadiusScript error: No such module "val".[5] Template:Solar radius
Luminosity446[5] Template:Solar luminosity
Temperature40,000[5] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[11]
Database references
SIMBADdata

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Kappa1 Apodis is a binary star[4] system in the southern circumpolar constellation of Apus.[1] Its idetifier is a Bayer designation that is Latinized from κ1 Apodis, and abbreviated Kap1 Aps or κ1 Aps, respectively. Based upon parallax measurements, it is located roughly Script error: No such module "convert". from Earth. The combined apparent visual magnitude of the system is 5.52,[3] indicating that this is a faint, naked eye star that can be viewed in dark suburban skies. It is moving away from the Sun with a radial velocity of +62 km/s.[7]

File:Kappa1ApsLightCurve.png
A light curve for Kappa1 Apodis, plotted from TESS data[12]

This is a spectroscopic binary system, made up of a Be star and a subdwarf O star, which complete an orbit around each other every 192 days.[8] The combined spectrum matches a stellar classification of B1npe.[4] The 'e' suffix indicates that this is a Be star with emission lines in the spectrum. An 'n' means that the absorption lines in the spectrum are broadened from the Doppler effect as a result of rapid rotation. Finally, the 'p' shows some peculiarity in the spectrum. It is classified as a Gamma Cassiopeiae type variable star and its brightness varies from magnitude +5.43 to +5.61.

This is a runaway star with a peculiar velocity of Script error: No such module "val"..[10] Because it is a binary star system, it was most likely not turned into a runaway system as the result of a supernova explosion.[4]

A 12th-magnitude orange K-type subgiant[13] located at an angular separation of 27 arcseconds has a much smaller parallax than Kappa1 Apodis and is a distant background object.[14]

References

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

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External links

Template:Stars of Apus

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