Lo spettro di ζ Tauri: Nota II

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RIASSUNTO - Si dànno i risultati dello studio di due spettrogrammi di ζ Tauri presi con spettrografo a quarzo senza fenditura, con una dispersione di 40 A/mm ad Hγ, abbraccianti l'intervallo spettrale 6000-3150 A. Si confrontano i resultati di questo lavoro con i resultati complessivamente nell'atmosfera e nella atmosfera estesa (shell). Fra le caratteristiche dello spettro di ζ Tuari all'epoca del presente studio, si segnala la presenza di ali in emissione in Hβ con V/R > 1, la presenza delle righe dell'elio 5016 e 3965, provenienti dal livello metastabile 2¹S, di cui la prima è larga con profilo in tutto simile alle altre righe dell'elio provenienti da livelli notmali, e la seconda sottile, e inoltre la presenza della riga 3188 dell'elio proveniente dal livello metastabile 2³S, molto sottile. ABSTRACT - Prof. Chalonge of the Institute d'Astrophisique (Paris) gave me the opportunity to measure and study two spectrograms of ζ Tauri taken with the quartze spectrograph without slit of the St. Michel Observatory (Haute Provence). The dispersion given by the spetctrograph is 50 A/mm at Hγ and the spectral region is 3150-6000 A. The results obtained by these spectrograms are compared with those of preceding observations as the ones previously done in Arcetri on this star and others. The numbers of H and He atoms present on the atmosphere, including the shell, are determined. At the time of these observations is noted the presence of emission-wings in Hβ with V/R > 1, also the presence of helium lines 5016 and 3965, originated on the metastable level 2¹S. Line 5016 is wide with profile similar to the others helium lines originated at normal levels. Line 3965 is sharp. The He line 3188 originated at the metastable level 2³S is very sharp.

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