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Coordinated X-ray, optical, and radio observations of YZ Canis Minoris
Journal article   Peer reviewed

Coordinated X-ray, optical, and radio observations of YZ Canis Minoris

J. T Karpen, C. J Crannell, R. W Hobbs, S. P Maran, T. J Moffett, D Bardas, G. W Clark, D. R Hearn, F. K Li, T. H Markert, …
The Astrophysical journal, Vol.216, p.479
09/1977
DOI: 10.1086/155489

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Abstract

We report coordinated X-ray, optical, and radio observations of the flare star YZ CMi, including the first occasion on which such a star has been monitored in all three spectral regions simultaneously. Thirty-one minor optical flares and 11 radio events were recorded. No major optical flares greater than 3 magnitudes were observed during the program. Although no flare- related X-ray emission was observed, the measured upper limits in this band enable meaningful comparisons with published flare-star models. Three of the five models predicting the relative X-ray to optical or radio flare luminosities are in serious disagreement with the observations. For the largest optical flare with coincident X-ray co1verage, the 3 a upper limit on X-ray emission in the 0.15-0.8 keV band is about 9 x 1028 ergs 5 - , corresponding to a ratio of X-ray to B-band luminosity of <0.3. Based on the present results, the fraction of the galactic component of the diffuse soft X-ray background contributed by UV Ceti-type flare stars is <9 x H, where H is the mean density of interstellar hydrogen within a few hundred parsecs of the Sun. Subject headings: radio sources: variable - stars: flare - stars: individual - X-rays: bursts

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