Central Bureau for Astronomical Telegrams
IAUC 5307: NOVAE; AG Car; NOTICE TO E-MAIL SUBSCRIBERS
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Circular No. 5307
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
NOVAE
T. E. Harrison and G. Stringfellow, Mount Stromlo Observatory,
communicate the following infrared photometry (uncertainty 0.05 in J,
H and K, 0.10 in L, 0.20 in M) and spectroscopy, obtained using IRPS
and CIGs on the 2.3-m telescope at Siding Spring:
Nova Cen 1991. June 22.31 UT, J = 6.65, H = 5.69, K = 4.44, L =
2.58, M = 1.40. A large infrared excess has developed, suggesting the
formation of a dust shell. However, no single color temperature
adequately characterizes the photometric data. A K spectrum reveals
strong H I Br gamma 2.165-micron emission superposed on a red
continuum. In the H band, emission from H I Br 10 to 12 is present.
Also strong is the H I Paschen beta 1.28-micron line.
Nova Oph 1991. June 22.62 UT, J = 10.54, H = 10.70, K = 9.77, L =
9.08. K band spectra reveal weak H I Br gamma emission and stronger
He I 2.058-micron emission.
Nova Her 1991. June 22.63 UT, J = 13.97, H = 12.86, K = 10.26,
L = 7.24.
AG CARINAE
P. M. Kilmartin, Mount John University Observatory, relays a
report from F. M. Bateson to the effect that the S Dor-type variable
AG Car (R.A. = 10h54m11s, Decl. = -60 11.2, equinox 1950.0) has been
very slowly brightening since July 1990 and appears now to be heading
for a novalike outburst similar to that observed in 1963. Recent
monthly mean magnitudes, each from about 70 visual observations, are:
1991 Jan., 7.83; Feb., 7.87; Mar., 7.81; Apr., 7.77; May, 7.67; June,
7.60; July to date, 7.52 and rising.
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1991 July 15 (5307) Brian G. Marsden
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