By M. Rodonò (auth.), Patrick B. Byrne, Marcello Rodonò (eds.)

ISBN-10: 9400971575

ISBN-13: 9789400971578

ISBN-10: 9400971591

ISBN-13: 9789400971592

IAU Colloquium No. seventy one had its quick origins in a small amassing of individuals . within the optical and UV learn of flare stars which came about through the 1979 Montreal normal meeting. We famous basic swap was once occurring within the research of those items. Space-borne tools (especially lUE and Einstein) and a brand new genera­ tion of ground-based apparatus have been having a profound influence at the diversity of investigations it was once attainable to make. To extract greatest reap the benefits of those new probabilities it'd be beneficial as by no means sooner than to have stable conversation with colleagues in different disciplines, for instance,. with atomic and sunlight physicists. equally, reports of phenomena linked to the outer atmospheres of the late-type stars may now wish to offer major insights into definite features of sunlight task. So, in view of the wide variety of backgrounds of these engaging, the assembly had an surprisingly excessive percentage of invited reports whereas many of the contributed papers have been offered as posters. it really is fulfilling that during the fast time because the assembly a great deal of correspondence has been obtained from contributors remarking at the luck of this structure. as soon as the choice have been taken in precept to carry the assembly, a truly significant quantity of labor fell at the organizing committees, viz. the medical and native Organizing Committees. The medical Organizing Committee used to be chaired by way of D.J. Mullan and consisted of A.D.

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Extra resources for Activity in Red-Dwarf Stars: Proceedings of the 71st Colloquium of the International Astronomical Union Held in Catania, Italy, August 10–13, 1982

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For such stars convective overshoot may produce the required dependence on mass and age, by extending the mixing region deep enough to allow Li burning (Straus et al. 1976). 6. Chromospheric effects on photometric metallicity determinations The metal-to-hydrogen ratio can be measured by intermediate band photometry. The Str~mgren uvbyß system uses a line blanketing index dominated by iron lines as a measure of metallicity. The interpretation of such a parameter may not be unique for active stars, however, as the presence of stellar chromospheric activity may affect the photometric index through filling-in of the cores of strong non-magnetic lines as a result of heating in the lower chromosphere.

This dispersion is what one would expect from the main sequence dwarf models of Mould (1976), when the metal abundance is varied between the solar value and one tenth of this. 2 ~HALO OLD DISK VOUNG DISK • FLARE STARS o c 10 08 I 0 u 0 06 ("') CO "'0 Ol. 4 TiO Fig. 7. Photometrically determined quantities for molecular band heads reveal an abundance sensitivity. The lines are theoretical relations from Mould (1976). PARAMETERS OF ACTIVE DWARF STARS 25 no theoretical comparison can be made for Tett<3000 K.

1983, in Stenflo (1983). : 1982, IJp. , in press. Vaiana, G. : 1981, but. f. Sei. (Tolcyo), 597, 1. Vaiana, G. : 1983, in Stenflo (1983). Vaiana, G. Jp. , MS, 163. Vaughan, A. : 1983, in Stenflo (1983). Vaughan, A. , and Preston, G. : 1980, PIJSP, 92, 235. Walter, F. Jp. , MS, 677. Walter, F. : 1981, /Jp. , MS, 671. Willson, R. , Hudaon, H. , and Chapman, G. : 1981, Science, 211, 700. Wilson, 0. Jp. , 144, 695. : 1983, in Stenflo (1983). MAGNETIC FIELDS AND ACTIVITY OF THE SUN AND STARS 13 DISGUSSION Mullan: Can I ask whether there 1s a connection between flares and coronal heating or do you thing that those topics should be discussed separately?

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Activity in Red-Dwarf Stars: Proceedings of the 71st Colloquium of the International Astronomical Union Held in Catania, Italy, August 10–13, 1982 by M. Rodonò (auth.), Patrick B. Byrne, Marcello Rodonò (eds.)

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