HD 192685

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HD 192685
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Vulpecula
Right ascension 20h 15m 15.90s
Declination +25° 35′ 31.0″
Apparent magnitude (V) 4.78
Distance 1,199 ly
(368 pc)
Spectral type B3V[1]
Database references
SIMBAD 192685 data

HD 192685, also known as QR Vul or HR 7739, is a star 1,199 ly away in the Vulpecula constellation. It is visible to the naked eye. It is a Be star and is slightly variable.[2] From October to December 1982 the Hydrogen alpha absorption line increased in emission strength by 30%.[3] The line is partially filled by redshifted emission.[4]

HD 192685 has excess infrared emissions (12-100 μm) which are interpreted to be free-free radiation in the gas surrounding the star.[5]

References[edit]

  1. ^ Walker, G. A. H.,; Yang, S.; Witt, A. N.; Fahlman, G. G. (Aug–Sep 1980). "The extinction of HD 200775 by dust in NGC 7023". Astronomical Society of the Pacific, Publications 92: 414. Bibcode:1980PASP...92..411W. doi:10.1086/130687. 
  2. ^ K. Pavlovski et al UBV photometry of Be stars at Hvar: 1972-1990
  3. ^ Pavlovski, K.; Bozic, H.; Harmanec, P.; Horn, J.; Koubsky, P. (14 November 1983). "Sudden Brightening of the Recently Discovered Be Star HR 7739". Information Bulletin on Variable Stars 2431 (1). ISSN 0374-0676. 
  4. ^ Green, Daniel W. E. (July 14, 1982). "2 Vul AND HR 7739". IAUC 3710. IAU Central Bureau for Astronomical Telegrams. Retrieved 11 December 2012. 
  5. ^ Cote, J. (July 1987). "B and A type stars with unexpectedly large colour excesses at IRAS wavelengths". Astronomy and Astrophysics 181 (1): 83. ISSN 0004-6361. 

External links[edit]