66 Ophiuchi

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66 Ophiuchi
Ophiuchus constellation map.svg
Red circle.svg
Location of 66 Ophiuchi (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Ophiuchus
Right ascension 18h 00m 15.79825s [1]
Declination 04° 22′ 07.0163″ [1]
Apparent magnitude  (V)4.60 [2]
Characteristics
Evolutionary stage main sequence
Spectral type B2Ve [3]
U−B color index −0.81 [2]
B−V color index −0.02 [2]
Variable type γ Cas [4]
Astrometry
Radial velocity (Rv)−12.80 [5]  km/s
Proper motion (μ)RA: +1.23 [1]   mas/yr
Dec.: −12.73 [1]   mas/yr
Parallax (π)5.01 ± 0.26  mas [1]
Distance 650 ± 30  ly
(200 ± 10  pc)
Absolute magnitude  (MV)−2.8 + −0.2 [6]
Orbit [6]
Period (P)23421.1 ± 4.1 d
Semi-major axis (a)178.36 ± 1.37 mas
Eccentricity (e)0.142 ± 0.006
Inclination (i)75.90 ± 0.69°
Longitude of the node (Ω)338.87 ± 0.31°
Periastron epoch (T)JD 2452658.5 ± 50.2
Argument of periastron (ω)
(secondary)		115.24 ± 0.95°
Details
66 Oph A
Mass 9.6 [6]   M☉
Luminosity 1524.63 [7]   L☉
Surface gravity (log g)3.69 [8]   cgs
Temperature 22,000 [9]   K
Metallicity [Fe/H]0.00 [8]   dex
Rotational velocity (v sin i)250 [10]  km/s
Age 14.0±3.2 [11]   Myr
66 Oph B
Mass 3.8 [6]   M☉
Other designations
66 Oph, V2048 Oph, BD+04°3570, GC  24500, HD  164284, HIP  88149, HR  6712, SAO  123005, WDS J18003+0422AB [12]
Database references
SIMBAD data

66 Ophiuchi is a binary [6] variable star [13] in the equatorial constellation of Ophiuchus. It has the variable star designation V2048 Ophiuchi, while 66 Ophiuchi is the Flamsteed designation. This object is visible to the naked eye as a faint, blue-white hued point of light with a baseline apparent visual magnitude of 4.60. [2] It is located approximately 650  light years away from the Sun based on parallax, [1] but is drifting closer with a radial velocity of −13 km/s. [5] The star has a peculiar velocity of 13.1±3.2 km/s [14] relative to its neighbors.

A visual band light curve for V2048 Ophiuchi, adapted from Floquet et al. (2002) V2048OphLightCurve.png
A visual band light curve for V2048 Ophiuchi, adapted from Floquet et al. (2002)

The primary star, known as 66 Ophiuchi A, is a main sequence Be star with a stellar classification of B2Ve. [3] Be stars are rapidly rotating stars that eject gas from their equators due to their rotation, forming disks that produce emission lines. 66 Ophiuchi A's disk extends out to 115 R☉. [15] Like many other Be stars, it is a γ Cas variable; a shell star with a circumstellar disc of gas and is exhibiting irregular changes in brightness, ranging from 4.85 up to 4.55 magnitude. [4] The star is 14 million years old with 9.6 [6] times the Sun's mass and is spinning rapidly with a projected rotational velocity of 250 km/s. [10] It is radiating 1,525 [7] times the Sun's luminosity from its photosphere at an effective temperature of 22,000 K. [9] Because of its rotation, it has a polar equatorial radius 4.50 that of the Sun, but an equatorial radius 5.11 that of the Sun. [15]

A magnitude 6.5 visual companion at an angular separation of 0.1″ has been reported, and is known as 66 Ophiuchi B. [16] It is 2.61 magnitudes fainter than the primary. This corresponds to a mass of about 3.8 times that of the Sun, and a spectral class of about B8. [6]

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References

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  5. 1 2 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID   119231169.
  6. 1 2 3 4 5 6 7 Hutter, D. J.; Tycner, C.; Zavala, R. T.; Benson, J. A.; Hummel, C. A.; Zirm, H. (2021). "Surveying the Bright Stars by Optical Interferometry. III. A Magnitude-limited Multiplicity Survey of Classical Be Stars". The Astrophysical Journal Supplement Series. 257 (2): 69. arXiv: 2109.06839 . Bibcode:2021ApJS..257...69H. doi: 10.3847/1538-4365/ac23cb . S2CID   237503492.
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  8. 1 2 Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv: 1009.1491 . Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014. S2CID   53480665.
  9. 1 2 Hohle, M.M.; Neuhäuser, R.; Schutz, B.F. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349. arXiv: 1003.2335 . Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. S2CID   111387483. Vizier catalog entry
  10. 1 2 Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359–365. Bibcode:2002ApJ...573..359A. doi: 10.1086/340590 .
  11. ↑ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv: 1007.4883 . Bibcode:2011MNRAS.410..190T. doi: 10.1111/j.1365-2966.2010.17434.x . S2CID   118629873. Vizier catalog entry
  12. ↑ "66 Oph". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-06-21.
  13. 1 2 Floquet, M.; et al. (October 2002). "Variability and pulsations in the Be star 66 Ophiuchi" (PDF). Astronomy and Astrophysics. 394: 137–149. Bibcode:2002A&A...394..137F. doi: 10.1051/0004-6361:20021105 .
  14. ↑ Bobylev, V. V.; Bajkova, A. T. (August 2013). "Galactic kinematics from a sample of young massive stars". Astronomy Letters. 39 (8): 532–549. arXiv: 1307.1677 . Bibcode:2013AstL...39..532B. doi:10.1134/S106377371308001X. S2CID   118568203.
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  16. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi: 10.1086/323920 . Vizier catalog entry
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