Central Bureau for Astronomical Telegrams
IAUC 5928: 1993J; GRO J0422+32; N Cas 1993
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Circular No. 5928
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)
SUPERNOVA 1993J IN NGC 3031
S. Benetti, A. Clocchiatti, and J. C. Wheeler, University of
Texas, report: "A fully reduced spectrogram (range 400-920 nm,
resolution 0.9 nm) of SN 1993J, obtained on Jan. 17.5 UT at the 2.1-m
telescope of McDonald Observatory, shows three strong emission
lines and a very blue continuum: [O I] at 630.0 and 636.4 nm (
integrated flux 5.8 x 10E-13 erg sE-1 cmE-2 with the same fine
structure as reported on IAUC 5847), Ca II] at 729.1 and 732.4 nm (flux
2.9 x 10E-13 erg sE-1 cmE-2), and a remarkably strong Mg I] at
457.1 nm (flux 1.3 x 10E-13 erg sE-1 cmE-2). The lines have sharp
blue edges and fine structure. The Ca II infrared triplet is weak
(flux 1.1 x 10E-13 erg sE-1 cmE-2) in comparison with typical type-
II supernovae at the same phase. [Fe II] at 715.5 nm (flux 0.4 x
10E-13 erg sE-1 cmE-2) and Fe II at 492.4, 501.8, and 516.9 nm are
also present. Narrow, weak circumstellar H-alpha emission (FWHM =
1.4 nm, barely resolved) with maximum at 655.8 nm, already present
in a McDonald Observatory spectrum of 1993 Nov. 12, is broader and
more blue-shifted (-230 km/s) than the circumstellar H-alpha
emission observed just after outburst. Wide H-alpha emission with a
sharp red edge extends to the red from the base of the [O I] doublet
at 630.0 and 636.4 nm. Gaussian deconvolution yields FWHM =
40.5 nm centered at 656.6 nm. This feature may represent a shell
of hydrogen expanding at (half-width) velocity of 10 000 km/s."
GRO J0422+32
C. Chevalier and S. A. Ilovaisky, Observatoire de Haute-
Provence, write: "Time-resolved CCD photometry of this object
obtained on 1993 Dec. 17/18 and 21/22 with the 1.2-m Haute-Provence
telescope shows a light curve consistent with the period and phase
determined from 21 nights in 1993 Jan. and Feb. (IAUC 5692, 5734).
Assuming a double-wave light curve, the period is 0.4243 day with
the peak-to-peak amplitude near 0.05 mag in V. The average
brightness on these two nights was V = 15.5 and 15.8, respectively."
NOVA CASSIOPEIAE 1993
Further photoelectric photometry by H. Mikuz, Ljubljana, Slovenia
(cf. IAUC 5920): Jan. 15.77 UT, V = 7.49; 19.76, 7.73; 22.82,
7.67.
1994 January 28 (5928) Daniel W. E. Green
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