DQ Herculis
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DQ Herculis |
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | 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 |
| Semi-major 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. The nova was first observed on 13 Dec, 1934, reaching a peak brightness with an apparent magnitude 1.5 on 22 Dec, 1934.[1] The nova remaining visible to the naked eye for several months.[2] With the use of a modest telescope, the nova was observable for significantly longer.
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.[3]
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.
In Popular Culture
The nova was one of the brightest objects observable in the night sky. In addition to scientific articles, and received significant coverage in popular news publications.[4][5] Brad Ricca, an English professor at Case Western Reserve University, has suggested that Nova Herculis may have influenced the development of the origin story of the comic book superhero Superman.[6]
References
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