BP Circini

BP Circini

A light curve for BP Circini, plotted from Hipparcos data[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Circinus
Right ascension 14h 46m 41.98011s[2]
Declination −61° 27′ 42.9903″[2]
Apparent magnitude (V) 7.37 - 7.71[3]
Characteristics
Spectral type F2/3II + B6V[4]
B−V color index 0.649±0.020[5]
Astrometry
Proper motion (μ) RA: −5.355[2] mas/yr
Dec.: −3.920[2] mas/yr
Parallax (π)0.9952 ± 0.0402 mas[2]
Distance3,300 ± 100 ly
(1,000 ± 40 pc)
Absolute magnitude (MV)−2.91[6]
Orbit[6]
Period (P)20 yr
Semi-major axis (a)15.8 AU
Details
A
Mass5[7] M☉
Radius30.38+6.93
−6.50[2] R☉
Luminosity917±54[2] L☉
Surface gravity (log g)2.75[8] cgs
Temperature6356±23[8] K
B
Mass4.7[6] M☉
Surface gravity (log g)4.0±0.5[7] cgs
Temperature16,000±1,000[7] K
Other designations
BP Cir, CD−60°5320, HD 129708, HIP 72264, SAO 252879, WDS J14467-6128A[9]
Database references
SIMBADdata

BP Circini is a binary star system in the southern constellation of Circinus. It is located at a distance of approximately 3,300 light years from the Sun based on parallax.[2]

The variability of this star was discovered by D. W. Kurtz in 1979.[7] A small-amplitude Cepheid variable,[8] its apparent magnitude ranges from 7.37 to 7.71 over 2.39810 days.[3] A spectroscopic binary, the primary is a yellow-white bright giant of spectral type F2 or F3II.[4] The spectrum shows peculiarities in the metallic lines.[10] The secondary is a 4.7 solar mass (M☉) blue-white main sequence star of spectral type B6.[6]

  1. ^ Cite error: The named reference HipDataAccess was invoked but never defined (see the help page).
  2. ^ a b c d e f g h Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference AAVSOBP was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Skiff2014 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Evans_et_al_2013 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Petterson_et_al_2004 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Usenko_et_al_2014 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Kurtz1979 was invoked but never defined (see the help page).