Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...239l..27m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 239, July 1, 1980, p. L27-L31.
Astronomy and Astrophysics
Astronomy
24
Black Body Radiation, Dwarf Stars, Hydrogen Recombinations, Stellar Flares, Stellar Spectrophotometry, Ultraviolet Astronomy, Emission Spectra, Flux (Rate), Line Spectra, Plancks Constant, Solar Flares, Stellar Luminosity, Stellar Temperature
Scientific paper
Stellar flares have been observed using the 32 channel spectrophotometer on the 5 m telescope. Net flare fluxes in the region 3200-7000 A are presented. A simple model of blackbody radiation and hydrogen recombination emission appears to fit the continuum points well. Owing to vignetting problems, only the region between 4200 and 7000 A was used for a detailed fit to the Planck function to obtain apparent temperatures and effective areas. The rise of each flare was associated with an increase of the area, while the initial steep decline of the light was associated with a similar decrease of the blackbody temperature. The maximum temperatures, coincident with maximum light, were 7500-9500 K, similar to values for solar flares. The hydrogen line emission rose simultaneously with the continuum but declined more slowly. The ratio of Hgamma to Halpha was about 1.5 at the peak, declining to about 1.0 after the peak.
Mochnacki Stefan Wladyslaw
Zirin Harold
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