Normal distribution of flare colours and its interpretation

Details Normal distribution of flare colours and its interpretation Normal distribution of flare colours and its interpretation

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.116..189g&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 116, no. 1, Nov. 1985, p. 189-195.

Astronomy and Astrophysics

Astrophysics

Normal Density Functions, Stellar Color, Stellar Flares, Particle Beams, Stellar Models, Ubv Spectra

Scientific paper

The distribution of flare colours (U-B)f for 276 observed flares and (B-V)f for 174 observed flares is analyzed and the distribution of (U-B)f colours is shown to be close to normal. Approximating with a gaussian curve the distribution of these colours, unusual, extremely coloured flares are set up with finite probability. In fact, other authors have recently observed the same kinds of flares. It is pointed out that the existing flare models are unable to interpret flares bluer than (U-B)f = -2.3. In the present paper a new, simple model of flare colours, based on convective flare theory, is suggested with which the extremely coloured flares can also be easily interpreted. Finally, two interpretations are presented for the normal distribution of flare colours by the hypotheses of Ambartsumian and by the convective flare theory.

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