COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                    Number 1651

                                    Konkoly Observatory
                                    Budapest
                                    1979 July 31




             OPTICAL SPECTRUM OF UV Cas




     A spectrum of the star UV Cas between lambda lambda 4150 and 5050A
has been secured on September 15, 1978 at the 152 cm telescope
of the Bologna Observatory on a II aD plate and a Varo image-tube,
with a reciprocal dispersion of nearly. 84 A/mm. The most remarkable 
feature is the lack of the Balmer hydrogen lines, while
metals are mostly ionized and C_2 is possibly present at lambda 4714
and lambda 4737.
     The general pattern of the spectrum is very similar to
that of RY Sgr near maximum light (Alexander et al., 1972). As
the spectrum is underexposed below Lambda 4300 A it was not possible
to achieve a correct MK classification; however, on the basis of
the available features, a spectral type between F0 Ib and F5 Ib
may be suggested.
     A rough measure of the radial velocity (-30+-10 km/s) has
also been obtained in good agreement with those reported by
Abt (1973).
     The nature of R CrB-type star UV Cas seems so well established 
from a spectroscopical point of view, despite the puzzling
behaviour of its light-curve (Zavatti, 1975).




                     R. NESCI and F. ZAVATTI

                     Osservatorio Astronomico
                     Universitario
                     I-40100 Bologna

References:

Abt, H.A., Ap.J.Suppl., 26, 365, 1973 [BIBCODE 1973ApJS...26..365A ]
Alexander, J.B., Andrews, P.J. Catchpole, R.M., Feast, M.W.,
     Lloyd Evans, T., Menzies, J.W., Wisse, P.N.J., Wisse, M.,
     MNRAS, 158, 305, 1972 [BIBCODE 1972MNRAS.158..305A ]
Zavatti, F., I.B.V.S., No. 1027, 1975