V923 Aquilae

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V923 Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 30m 33.12318s[1]
Declination +03° 26′ 39.8594″[1]
Apparent magnitude (V) 6.06[2]
Spectral type B7III[3]
U−B color index -0.31[2]
B−V color index −0.02[2]
Variable type γ Cas
Radial velocity (Rv)-26[4] km/s
Proper motion (μ) RA: 14.42[1] mas/yr
Dec.: 2.20[1] mas/yr
Parallax (π)4.03 ± 0.31[1] mas
Distance810 ± 60 ly
(250 ± 20 pc)
Luminosity175[5] L
Temperature8,115[5] K
Rotational velocity (v sin i)300[6] km/s
Other designations
BD+03° 4043, HD 183656, HIP 95929, HR 7415, SAO 124704.
Database references

V923 Aquilae is a Be star in the equatorial constellation of Aquila. It is a binary star with a low mass secondary star orbiting at a separation of around 250 times the radius of the Sun. The primary varies with both short term and long term periodicity.[7]


  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. ^ a b c Haupt, H. F.; Schroll, A. (1974), "Photoelektrische Photometrie von Shell-Sternen", Astronomy and Astrophysics Supplement Series, 15: 311, Bibcode:1974A&AS...15..311H
  3. ^ Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 05: 0. Bibcode:1999MSS...C05....0H.
  4. ^ Kharchenko, N. V.; et al. (2007), "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations", Astronomische Nachrichten, 328 (9): 889–896, arXiv:0705.0878, Bibcode:2007AN....328..889K, doi:10.1002/asna.200710776
  5. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x
  6. ^ Slettebak, A. (September 1982), "Spectral types and rotational velocities of the brighter Be stars and A-F type shell stars", Astrophysical Journal Supplement Series, 50: 55–83, Bibcode:1982ApJS...50...55S, doi:10.1086/190820
  7. ^ Arias, M. L.; et al. (April 2004), "The circumstellar environment of the star V923 Aquilae", Astronomy and Astrophysics, 417 (2): 679–688, Bibcode:2004A&A...417..679A, doi:10.1051/0004-6361:20034435

External links[edit]