Gamma Coronae Borealis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Corona Borealis |
| Right ascension | 15h 42m 44.57s[1] |
| Declination | +26° 17′ 44.3″[1] |
| Apparent magnitude (V) | 3.84[1] |
| Spectral type | A0V[2] |
Gamma Coronae Borealis (γ CrB) is a star in the constellation Corona Borealis. A spectroscopic binary system, its components orbit each other every 92.94 years and are roughly as far apart from each other as the Sun and Neptune.[3] The individual stars have visual magnitudes of 4.04 and 5.60,[4] and spectral types B9V and A3V.[5]
When discovered to be variable in 1970, it was classified as a Delta Scuti variable with the earliest known spectral type of any known at the time and an amplitude of 0.05 magnitudes,[6] but it was soon realized that the nature of its variations was likely different from other Delta Scuti variables.[7] It is now known that stars with such spectral types can have pulsations similar to those of Delta Scuti variables.[8]
References
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