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Superflares on Ordinary Solar-Type Stars
Short-duration flares are well known to occur on cool main-sequencestars as well as on many types of ``exotic'' stars. Ordinarymain-sequence stars are usually pictured as being static on timescalesof millions or billions of years. Our Sun has occasional flaresinvolving up to ~1031 ergs that produce optical brighteningstoo small in amplitude to be detected in disk-integrated brightness.However, we identify nine cases of superflares involving1033-1038 ergs on normal solar-type stars. Thatis, these stars are on or near the main sequence, are of spectral classF8-G8, are single (or in very wide binaries), are not rapid rotators,and are not exceedingly young in age. This class of stars includes manyof those recently discovered to have planets as well as our own Sun, andthe consequences for any life on surrounding planets could be profound.For the case of the Sun, historical records suggest that no superflareshave occurred in the last two millennia.
| Sunspots That Changed the World
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| Flashes from normal stars
The characteristics of flashes from 24 normal stars are presented anddiscussed. Rate estimates are made for the flashes and possiblemechanisms for them are considered. The consequences for the earth ofsolar flashes of varying intensities are examined.
| Johnson BVR Magnitudes for Selected Comparison Stars
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| 66th Name-List of Variable Stars
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| Vibrating Neutron Star
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| Variability of HD 137147 (comparsion Star of U CrB) and "a Flare" of HD 137050
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Observation and Astrometry data
| Constellation: | Στέφανος Βόρειος |
| Right ascension: | 15h22m52.84s |
| Declination: | +31°33'13.2" |
| Apparent magnitude: | 8.607 |
| Distance: | 81.633 parsecs |
| Proper motion RA: | -45 |
| Proper motion Dec: | -121.6 |
| B-T magnitude: | 9.246 |
| V-T magnitude: | 8.66 |
Catalogs and designations:
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