Central Bureau for Astronomical Telegrams
IAUC 5453: N Sgr 1992; QSO 0836+710
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Read IAUC 5454
Circular No. 5453
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 SAGITTARII 1992
M. Della Valle and O. Hainaut, European Southern Observatory;
and L. Wisotski, Hamburg Observatory, report: "Preliminary analysis
of a spectrum (range 390-690 nm, resolution about 2 nm), obtained
with the 3.6-m telescope (+ EFOSC) at La Silla on Feb. 15.4, shows
this object to be a nova. The spectrum is characterized by emission
lines of H I, Fe II (mult. 42), N II (mult. 3), and Na I (589 nm).
The FWZI of H-alpha and H-beta are about 5000 km/s. No clear evidence
for P-Cyg absorption was observed. Photometry by C. Nitschelm
(Geneva Observatory) with the 0.70-m Swiss telescope: Feb. 15.4, V
= 8.5 +/- 0.1. Photometry by G. Cutispoto (Catagna Observatory)
with the ESO 0.50-m telescope: Feb. 15.4, V = 8.66 +/- 0.03, B-V =
+0.90 +/- 0.05, U-B = +0.05 +/- 0.07, V-R = +0.75 +/- 0.05, V-I =
+1.60 +/- 0.05; Feb. 16.5: V = 8.93, B-V = +0.78, U-B = -0.05, V-R =
+0.75, V-I = +1.60; Feb. 17.4, V = 9.12, B-V = +0.72, U-B = -0.10,
V-R = +0.75, V-I = +1.60 (same errors)."
G. Stringfellow and T. E. Harrison, Mt. Stromlo Observatory,
report: "Infrared spectroscopy (J, H, and K bands) of Nova Sgr 1992
on Feb. 15.7 UT revealed weak, broad lines of H I (Br-gamma, Br10 to
Br13, Pa-beta, Pa-gamma). There was no evidence for He I emission.
However, weak emission from O I at 1.13 microns was present."
R. H. McNaught, Anglo-Australian Observatory, reports that N
Sgr 1992 has increased in brightness by more than 10 magnitudes.
The nearest star to the earlier reported position (IAUC 5452) on the
ESO B survey is a star of mag 18-19, of no obvious color, situated
at R.A. = 18h06m28s.68, Decl. = -25 52'32".1 (equinox 1950.0; uncertainty
0".3 in R.A., 0".2 in Decl.). On the SERC J survey, there is
a blend of stars around mag 20 at the nominal position. Magnitude
estimate from P. Camilleri, Cobram, Victoria: Feb. 15.724 UT, 9.4.
QSO 0836+710
J. Schramm, J. V. Linde, U. Borgeest, and L. Nieser, Hamburg
Observatory, telex: "Since 1989 Oct., we have carried out a
photometric monitoring program of 0836+710 in the R band at the Calar
Alto 1.23-m telescope. Until 1991 Oct., only minor variations of
0.05 magnitude had been detected. Since 1992 Feb. 6 an increase of
0.7 magnitude, reaching a maximum on Feb. 16.88 UT, has been
observed. Since then, the quasar has faded again by 0.2 magnitude."
1992 February 18 (5453) Daniel W. E. Green
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