- DQ Herculis
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This article refers to Nova Herculis 1934. Information on the star DQ Herculis is also here. For the type of cataclysmic variable star known as DQ Herc, see intermediate polars
DQ Herculis
DQ HerculisObservation data
Epoch J2000 Equinox J2000Constellation Hercules Right ascension 18h 07m 30.25s Declination +45° 51′ 32.6″ Apparent magnitude (V) 15.16 Characteristics Spectral type DBe+M2V Variable type DQ Herculis Astrometry Radial velocity (Rv) -4 km/s Parallax (π) -5 ± 11 mas Distance 316.2 ly
(97 pc)Absolute magnitude (MV) 12.99 Details Mass 0.7/0.4 M☉ Radius 0.012/0.44 R☉ Luminosity 0.0064/0.03 L☉ Temperature 14,500/3,500 K Orbit Period (P) 0.0002 yr Semimajor axis (a) 0.003 Astronomical Units" Inclination (i) 81.7° Other designations Database references SIMBAD data DQ Herculis (or Nova Herculis 1934) was a slow, bright nova occurring in Hercules in December 1934. It reached magnitude 1.5.
DQ Herculis is the prototype for a category of cataclysmic variable stars called intermediate polars. The system shows orbital period variation, likely due to the presence of a third body[1].
Substellar companion
Dai & Qian (2009) invoke the presence of a third object to explain orbital period variations observed in the dwarf nova. If the third body is confirmed, it would likely turn out a brown dwarf companion.
The DQ Herculis system[1] Companion
(in order from star)Mass Semimajor axis
(AU)Orbital period
(years)Eccentricity b (unconfirmed) ≥20 MJ 6.5 17.7 ≤0.12 References
- ^ a b Dai & Qian; Qian, S. B. (2009). "Plausible explanations for the variations of orbital period in the old nova DQ Herculis". Astronomy and Astrophysics 503 (3): 883–888. Bibcode 2009A&A...503..883D. doi:10.1051/0004-6361/200810909.
External links
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