HD 192685

HD 192685

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Vulpecula
Right ascension	20^h 15^m 15.90^s
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

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". Publications of the Astronomical Society of the Pacific 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). Bibcode:1983IBVS.2431....1P. 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. Bibcode:1987A&A...181...77C. ISSN 0004-6361.

External links

• Robin Leadbeater (translation). "Processing the spectrum of the star HD192685". PROCESSING LHIRES SPECTRA.
• HD 192685 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images