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V2052 Ophiuchi

V2052 Ophiuchi

A light curve for V2052 Ophiuchi, plotted from Hipparcos data[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ophiuchus
Right ascension 17h 56m 18.40012s[2]
Declination +00° 40′ 13.2733″[2]
Apparent magnitude (V) 5.81 – 5.84[3]
Characteristics
Spectral type B2 IV–V[4]
U−B color index −0.66[5]
B−V color index +0.09[5]
Variable type β Cephei[3]
Astrometry
Proper motion (μ) RA: −4.997±0.038[2] mas/yr
Dec.: −0.369±0.038[2] mas/yr
Parallax (π)3.5446 ± 0.0453 mas[2]
Distance920 ± 10 ly
(282 ± 4 pc)
Absolute magnitude (MV)−2.54[6]
Details
Mass8.9±0.7[7] M☉
Radius4.1±0.2[8] R☉
Luminosity3,426[2] L☉
Surface gravity (log g)4.00[4] cgs
Temperature23,000±1,000[4] K
Metallicity [Fe/H]+0.012[2] dex
Rotation3.638833±0.000003 d[9]
Rotational velocity (v sin i)60[9] km/s
Age21[10] Myr
Other designations
HR 6684, HD 163472, HIP 87812, SAO 122935[11]
Database references
SIMBADdata

V2052 Ophiuchi, also known as HR 6684, is a star about 920 light years from Earth in the constellation Ophiuchus.[2] It is a 5th-magnitude star, making it faintly visible to the naked eye of an observer far from city lights. V2052 Ophiuchi is a Beta Cephei variable (β Cep) star, varying slightly in brightness from magnitude 5.81 to 5.84 over a period of about 3.4 hours.[3]

In 1972, Mikolaj Jerzykiewicz announced that HR 6684 is a variable star, based on his observations using the 0.6 meter Air Force Telescope on Mauna Kea. He classified the star as a β Cep variable with period of 0.13989 days, He further noted that if confirmed, it would be the least luminous and shortest period β Cep star known up to that date.[12] Spectroscopic and photometric observations by D. Harold McNamara and Bruce Bills in 1973 confirmed Jerzykiewicz's results.[13] In 1973, HR 6684 was given the variable star designation V2052 Ophiuchi.[14]

In 1994, Henryk Cugier et al. determined that V2052 Ophiuchi pulsated primarily in the fundamental (l=0) radial mode.[15] A much less powerful non-radial pulsation mode was identified in 2003.[8] Ultraviolet observations by the TD-1A satellite show that throughout its pulsation cycle, the temperature of V2052 Ophiuchi varies by 1040±880 K, and its radius changes by 3.1%±0.9%.[5] Observations at the Pic du Midi Observatory showed that V2052 Ophiuchi has a dipole magnetic field, the axis of which is offset from the star's center, and there are helium spots on the surface near the magnetic poles.[9] V2052 Ophiuchi is a type of chemically peculiar star known as a helium-strong star. Its surface is over-abundant in helium, and under-abundant in oxygen, perhaps due to its magnetic field differentially effecting the diffusion of elements in its atmosphere.[8]

  1. ^ Cite error: The named reference CDS was invoked but never defined (see the help page).
  2. ^ a b c d e f g h Cite error: The named reference dr3 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference gcvs was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Morel2006 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Beeckmans1977 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference melnik2020 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Briquet2012 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference Neiner2003 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference Neiner2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference tetzlaff2011 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Jerzykiewicz1972 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference McNamara1973 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Kukarkin1973 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Cugier1994 was invoked but never defined (see the help page).
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