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IAUC 5657: N LMC 1992; N Sgr 1992 No. 3

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                                                  Circular No. 5657
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


NOVA IN THE LARGE MAGELLANIC CLOUD 1992
     R. H. McNaught, Anglo-Australian Observatory, reports the
following measurement obtained from an Uppsala Southern Schmidt
telescope film obtained on Nov. 13.6 UT:  R.A. = 5h19m36s.88, Decl. =
-68 57'31".4 (equinox 1950.0, uncertainty 0".3 in R.A., 0".2 in
Decl.).  A nearby star of mag 13 has end figures 24s.16, 34".1.
     S. N. Shore, Goddard High Resolution Spectrograph team and
Computer Sciences Corporation; S. Starrfield, Arizona State University;
R. Gonzalez-Riestra, International Ultraviolet Explorer (IUE)
Observatory, European Space Agency, Madrid; and G. Sonneborn,
Goddard Space Flight Center, NASA, report:  "Low-dispersion
spectrograms (115.0-330.0 nm, resolution 0.6 nm) of this object were
obtained with the IUE satellite on Nov. 13.3 and 19.2 UT.  The
spectra are all characteristic of an optically thick shell with a
relatively slow expansion velocity.  The Nov. 13 spectra were probably
taken at ultraviolet minimum; the Fine Error Sensor magnitudes
were 10.4 on Nov. 13.2 and 11.9 on Nov. 19.1.  The integrated
fluxes in units of 10E-11 erg cmE-2 sE-1 for 120-200 nm were:  Nov.
13.4, 0.34; Nov. 19.3, 3.57; and for 210-330 nm were:  Nov. 13.2,
10.9; Nov. 19.2, 11.9.  The ultraviolet spectrum showed a continuum
sharply attenuated shortward of 170 nm by absorption from an optically
thick shell.  The absorption is as severe as is typically seen
in the earliest ultraviolet spectra of classical novae, but the
optical depth is decreasing quickly and continuum windows near 150
and 180 nm have appeared.  The nova is evolving at roughly constant
bolometric luminosity which, for an assumed distance of 55 kpc and
E(B-V) = 0.15, gives a luminosity of about 30 000 L(sun) on Nov.
19.2.  Mg II was in emission, with FWHM = 1800 km/s; Al II 264.0-nm
is also present.  No other prominent single emission lines were
present in these early spectra.  Ultraviolet observations are
continuing."


NOVA SAGITTARII 1992 No. 3
     Visual and photovisual magnitude estimates (cf. IAUC 5652):
Nov. 7.10 UT, 9.5 (P. Collins, Boulder, CO); 8.21, 9.5 (Collins);
14.71, 10.5 (A. Boattini, Piazzano, Italy); 15.06, 10.21 (W. Liller,
Vina del Mar, Chile; CCD); 16.07, 10.34 (Liller; CCD).


1992 November 19               (5657)            Daniel W. E. Green

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