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CU Virginis

CU Virginis

A light curve for CU Virginis, plotted from Hipparcos data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension 14h 12m 15.80569s[2]
Declination +02° 24′ 33.9342″[2]
Apparent magnitude (V) 4.99[3] (4.92–5.07)[4]
Characteristics
Spectral type ApSi[5] or B8.5 Vp Si[6]
B−V color index −0.118±0.006[3]
Variable type α2 CVn[4]
Astrometry
Radial velocity (Rv)−2.0±7.4[7] km/s
Proper motion (μ) RA: −43.049[2] mas/yr
Dec.: +26.081[2] mas/yr
Parallax (π)13.9366 ± 0.2601 mas[2]
Distance234 ± 4 ly
(72 ± 1 pc)
Absolute magnitude (MV)0.50[3]
Details[8]
Mass3.06±0.06 M☉
Radius2.06±0.14 R☉
Luminosity100±11 L☉
Surface gravity (log g)4.30±0.06 cgs
Temperature12,750±250 K
Rotation0.5207137±0.0000010 d[9]
Rotational velocity (v sin i)145±3 km/s
Other designations
CU Vir, BD+03°2867, FK5 3127, HD 124224, HIP 69389, HR 5313, SAO 120339, ADS 9152 A, WDS J14123+0225A[10]
Database references
SIMBADdata

CU Virginis is a single[11] star in the equatorial constellation of Virgo.[12] It has an apparent visual magnitude of 4.99,[3] which is bright enough to be faintly visible to the naked eye. The distance to this star can be estimated from its annual parallax shift of 13.9 mas,[2] yielding a separation of 234 light years.

This is one of the best studied Ap stars.[13] It has a stellar classification of Ap Si[5] with strong lines of silicon and weak helium lines. The star is a fast rotator with a period of 0.52 days and an axis that is inclined by 46.5°±4.1° to the line of sight from the Earth.[8] Both the spectrum and luminosity of the star vary with the rotation,[13] and it is classified as a α2 Canum Venaticorum variable with the designation CU Virginis (CU Vir).[4] There is some evidence that the rotation period may vary slightly over a timescale measured in decades.[14] Such changes have been observed to occur in glitches, rather than varying constantly.[13]

CU Virginis has three times the mass of the Sun and double the Sun's radius. It is radiating 100 times the Sun's luminosity from its photosphere at an effective temperature of 12,750 K.[8] The star has a strong magnetic field, placing it in the class of magnetic chemically peculiar stars. The polar magnetic field has a strength of about 3 kG.[13] The magnetic pole may be displaced by 87° from the axis of rotation, and the effective magnetic field is seen to vary over the course of a rotation.[13] The mean surface magnetic field varies over the range 1.2–3.2 kG.[15]

This star is a radio emitter, with the emission being modulated by the rotational phase. This emission is believed to be gyrosynchrotron radiation emitted by mildly relativistic (Lorentz factor of γ ≤ 2) electrons trapped in the magnetosphere". Two pulses of 100% circularly polarized radio energy are detected each rotation, which may be produced via an electron cyclotron maser process. These polarized beams are then refracted as they pass through cold plasma in the star's magnetosphere.[13]

  1. ^ Cite error: The named reference HIPCurve was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference gcvs was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Abt1995 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Kharchenko was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Kochukhov2014 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Pyper2013 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Kaler2014 was invoked but never defined (see the help page).
  13. ^ a b c d e f Cite error: The named reference Lo2012 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Mikulášek2011 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Glagolevskij2002 was invoked but never defined (see the help page).

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