Electronic Telegram No. 747
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
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BRIGHT VARIABLE STAR IN CASSIOPEIA
     R. O. Gray, Department of Physics and Astronomy, Appalachian State
University, reports that a spectrum (range 380-560 nm; resolution 0.18
nm/pixel; S/N about 100) of the new variable in Cas (cf. CBET 718) was
obtained on Nov. 5.04 UT using the G/M classification spectrograph on
the Dark Sky Observatory (DSO) 0.81-m telescope.  This spectrum yields a
precise spectral type of A1 IV+ and shows no peculiarities with respect
to the MK A1 IV standard rho Peg.  There is no indication of emission,
nor are the shell lines (e.g., Fe II 423.3-nm, or lines of the Fe II
multiplet 42) enhanced in the spectrum.  The hydrogen-line cores show no
sign of emission.  The very blue continuum reported by Iijima on CBET 718
is not in evidence, but it turns out the comparison star used by Iijima
(HD 217086) is itself very reddened.  The reddening estimated by Munari et
al. of E(B-V) = 0.29 is in good agreement with the DSO flux-calibrated
spectrum.  The emission reported by Tucker at 466.7 nm is not seen in the
DSO spectrum.  The hydrogen-beta line has an equivalent width of 1.39 nm.
     Visual magnitude estimates by A. Diepvens, Balen, Belgium:
Nov. 7.722 UT, 10.9; 15.735, 10.9; 17.732, 11.1; 18.728, 11.1.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2006 CBAT
2006 November 21                 (CBET 747)               Daniel W. E. Green