Central Bureau for Astronomical Telegrams
IAUC 5031: CZ Ori; NSV 1710; 1989c1
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Read IAUC 5032
Circular No. 5031
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
CZ ORIONIS
A. Bianchini, R. Margoni, and C. Spogli, Padua and Asiago
Observatories, report: "In the course of our spectroscopic monitoring
of dwarf novae with the 1.82-m telescope of the Asiago Astrophysical
Observatory, we have observed CZ Ori during two outbursts
in the periods 1988 Oct. 31-Nov. 2 and 1989 Jan. 13-14. Thirty
Boller and Chivens (+ CCD) spectra in the spectral region from H-
delta to H-beta (resolution 0.2 nm/pixel) showed broad absorption
Balmer lines with central emission peaks. A weak He II (468.6 nm)
emission was also detected. Fourier analysis of radial velocities
of the emissions gives as the most probable period 5.15 hr. The
semiamplitude of the modulation is about 50 km/s."
NSV 1710
A. R. Klemola, Lick Observatory, University of California,
writes: "A precise position measured at Lick for a tenth-magnitude
star (NSV 1710) on the POSS blue plate (R.A. = 4h43m02s.688, Decl.
= -23 56'44.42, equinox 1950.0, epoch 1953.86) confirms its
positional coincidence with the infrared source IRC 20062 = IRAS
04430-2356, as reported by Hakkila and Pierce (1990, P.A.S.P. 102,
586). Moreover, a faint star of estimated blue magnitude 17.5-18.0
is observed on a Lick 0.51-m astrograph blue plate taken one year
later (epoch 1954.84), whose position (R.A. = 4h43m02s.680, Decl. =
-23 56'44.68, equinox 1950.0) coincides with the very red POSS object
(B = 12.9, V = 10.3) to within the errors of measurement. No star is
visible on the Lick Observatory Sky Atlas to its blue magnitude limit
about 16 (epoch 1954.89). This result implies an optical variable
with amplitude of about 4.5-5.0 magnitudes or more in the blue band."
COMET AUSTIN (1989c1)
R. M. West, European Southern Observatory, communicates: "On
a 10-min B exposure (IIa-O + GG385 filter), obtained at La Silla by
G. Pizarro with the 1-m ESO Schmidt on June 5.39 UT, and photographically
enhanced by H.-H. Heyer, ESO-Garching, the predicted 'neck-
line' (cf. IAUC 4991) is clearly visible as a 1'.5-wide, straight,
dense structure stretching at least 2.6 deg (plate border) at p.a.
332 deg within a broader, diffuse, and rather faint envelope. A
much weaker sunward spike at p.a. 152 deg can be followed to about
30' from the nucleus."
1990 June 14 (5031) Daniel W. E. Green
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