Central Bureau for Astronomical Telegrams
IAUC 5174: N Mus 1991; 1990E
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Circular No. 5174
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 or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
NOVA MUSCAE 1991
R. Gonzalez-Riestra, A. Cassatella, and W. Wamsteker,
International Ultraviolet Explorer Observatory, European Space Agency,
Villafranca; C. Shrader and S. Shore, Computer Science Corporation,
Goddard Space Flight Center; and N. Lund, Danish Space Research
Institute, Lyngby, report: "We made low-resolution ultraviolet
observations of Nova Mus 1991 with the IUE on Jan. 17.58 (Vilspa) and
18.21 UT (GSFC). The visual magnitudes as measured by the Fine Error
Sensor onboard IUE were 13.18 and 13.22, respectively. The 120-
to 320-nm spectra showed a hot continuum extending shortwards of Ly-
alpha. The integrated 120- to 320-nm flux was 1.07 x 10E-10 erg
cmE-2 sE-1. Emission lines identified (and net flux on Jan. 18.21
in units of 10E-13 erg cmE-2 sE-1) were C IV 155-nm (12), N V 125-nm
(6.56), Mg II 280-nm (1.62), and O V 138-nm (2.34); no He II 164-nm
was seen, to an upper limit of 0.947. The C IV feature had FWHM =
0.74 nm (1500 km/s). Evidence of faint, broad absorption features
was present in the 160- to 180-nm range. The spectra on Jan. 17.58
gave measured continuum fluxes at 130 nm, 150 nm, and 310 nm of
14.0, 10.4, and 3.7 x 10E-14 erg cmE-2 sE-1 AE-1. No substantial
changes in the ultraviolet fluxes were observed on Jan. 18.21. From
the dust absorption feature around 22.0 nm, we derive a reddening
E(B-V) = 0.20 +/- 0.05. The reddening-corrected ultraviolet energy
distribution of Nova Mus 1991 is well described by a power law with
index -2.30, similar to that reported by Makino (IAUC 5161) from
Ginga observations."
SUPERNOVA 1990E IN NGC 1035
R. Lopez, University of Barcelona; and G. Gomez, Instituto de
Astrofisica de Canarias, report: "A low-resolution spectrogram of
SN 1990E was taken on Jan. 11 with the Faint Objects Spectrograph
(range 460-980 nm) on the 4.2-m William Herschel Telescope at La
Palma by G. Gomez; V. Reyes, Observatorio del Roque de los Muchachos;
and C. Benn, Royal Greenwich Observatory. The supernova is in the
nebular phase, as emission features attributed to [O I] (630.0 nm),
[S II] (671.6, 673.0 nm), [O II] (731.9, 733.0 nm), and [C I] (877.7
nm), as well as the H-alpha 656.3-nm emission wing, are well
developed. Velocities derived from these features are in the range
2300 (from [C I]) to 4500 km/s (from H-alpha)".
1991 January 24 (5174) Daniel W. E. Green
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