WZ Columbae

WZ Columbae

A light curve for WZ Columbae, plotted from TESS data[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension 05h 42m 15.19447s[2]
Declination −34° 40′ 04.1399″[2]
Apparent magnitude (V) 5.28±0.01[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type B9/9.5 V[5]
B−V color index −0.05[6]
Variable type SPB[7] or α2 CVn[8]
Astrometry
Radial velocity (Rv)36.3±0.6[9] km/s
Proper motion (μ) RA: +5.081 mas/yr[2]
Dec.: +51.365 mas/yr[2]
Parallax (π)8.929 ± 0.08896 mas[2]
Distance365 ± 4 ly
(112 ± 1 pc)
Absolute magnitude (MV)−0.3[10]
Details
Mass3.07±0.05[4] M☉
Radius3.47[11] R☉
Luminosity124[12] L☉
Surface gravity (log g)3.79±0.07[13] cgs
Temperature10,000+256
−250[4] K
Metallicity [Fe/H]+0.51[14] dex
Rotational velocity (v sin i)65±5[15] km/s
Age394+10
−17[16] Myr
Other designations
42 G. Columbae[17], WZ Col, CD−34°2401, CPD−34°711, GC 7150, HD 38170, HIP 26868, HR 1973, SAO 196098[18]
Database references
SIMBADdata

WZ Columbae, also known as HD 38170, is a solitary,[19] bluish-white hued star located in the southern constellation Columba, the dove. It has an apparent magnitude of 5.28,[3] allowing it to be faintly visible to the naked eye. Based on parallax measurements from the Gaia spacecraft, the object is about 365 light years distant.[2] It appears to be receding from the Solar System, having a heliocentric radial velocity of 36.3 km/s.[9]

WZ Columbae was originally listed as a slowly pulsating B-type star by the General Catalogue of Variable Stars. However, observations from Hempel & Howlger (2003) reveal it to be overabundant in strontium and barium.[14] Combined with Hipparcos photometry, this led to the object being reclassified as an Alpha2 Canum Venaticorum variable.[8] Based on data collected in the Hipparcos passband, it fluctuates between magnitudes 5.27 and 5.29 over 1.38 days.[7][20] However, TESS data suggests a period of 2.76618±0.00004 days; double that of the earlier data.[16]

The stellar classification of WZ Columbae is B9/9.5 V[5] — a main-sequence star with the characteristics of a B9 and B9.5 star. It has 3.07[4] times the mass of the Sun and is estimated to be 394 million years old,[16] having completed 89.2% of its main sequence lifetime.[4] It has a slightly enlarged radius of 3.47 R☉[11] and an effective temperature of 10,000 K.[4] This yields a luminosity 124 times that of the Sun[12] from its photosphere. Like most chemically peculiar stars, WZ Columbae has a relatively slow projected rotational velocity at 65 km/s.[15]

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Houk1982 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Stoy1968 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Dubath2011 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Kervella2021 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference McDonald2017 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  14. ^ a b Cite error: The named reference Hempel2003 was invoked but never defined (see the help page).
  15. ^ a b Cite error: The named reference Royer2002 was invoked but never defined (see the help page).
  16. ^ a b c Cite error: The named reference DavidUraz2021 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  19. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  20. ^ Cite error: The named reference VSX was invoked but never defined (see the help page).