Central Bureau for Astronomical Telegrams
IAUC 5591: GRO J0422+32; N Sgr 1992 No. 2; N Sco 1992
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Circular No. 5591
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)
GRO J0422+32
C. R. Shrader, Computer Sciences Corporation; R. M. Wagner,
Ohio State University; and S. Starrfield, Arizona State University,
report: "We have made ultraviolet spectroscopic observations of
the apparent optical counterpart to GRO J0422+32 = GRS 0417+335 on
Aug. 16.62 UT using the International Ultraviolet Explorer short-
and long-wavelength spectrographs in low-resolution mode. Preliminary
analysis indicates a moderately reddened continuum superimposed
with emission lines of N V (124 nm; equivalent width 0.78 nm;
flux 2.05), C IV (155; 0.70; 3.73), and He II (164; 0.29; 1.43),
where the parenthetical flux is given in units of 10E-13 erg cmE-2
sE-1. Additionally, we report the following continuum flux
measurements, given in units of 10E-14 erg cmE-2 sE-1: 140 nm, 4.92
+/- 0.28; 180 nm, 4.06 +/- 0.24; and 270 nm, 3.27 +/- 0.17. From
the dust absorption feature at 220 nm, we estimate a color excess
of E(B-V) = 0.40 +/- 0.07. The de-reddened ultraviolet energy
distribution is approximated by an f(lambda) power law with index -2.0.
The general characteristics of the spectrum are similar to those of
a number of low-mass x-ray binaries observed by IUE; however, the
emission line strengths are noticeably weaker than those seen in
the outburst spectra of Nova Mus 1991 or Centaurus X-4. Using the
Fine Error Sensor, we measure magnitude V about 13.3. We measured
new source coordinates that are slightly discrepant with those
reported on IAUC 5588 and 5590; to within the about 2" accuracy of
the IUE offset-maneuver used to acquire the target, we find its
position to be R.A. = 4h18m29s.9, Decl. = +32 47'24" (equinox 1950.0)."
NOVA SAGITTARII 1992 No. 2
Further unfiltered CCD magnitudes (cf. IAUC 5576) from W.
Liller, Vina del Mar, Chile: Aug. 11.23 UT, 10.15; 12.02, 10.23;
15.98, 10.28; 17.02, 10.45 (comparison stars SAO 186744, 186758).
NOVA SCORPII 1992
Further unfiltered CCD magnitudes (cf. IAUC 5575) from Liller:
Aug. 11.23 UT, 7.52; 12.02, 7.63; 15.98, 8.09; 17.02, 7.91 (
comparison star SAO 227635, mag 8.10).
1992 August 19 (5591) Daniel W. E. Green
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