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IAUC 6154: N Aql 1995; RX J0558+53; N Cen 1995

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                                                  Circular No. 6154
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444     TWX 710-320-6842 ASTROGRAM CAM
MARSDEN@CFA.HARVARD.EDU or GREEN@CFA.HARVARD.EDU (science)


NOVA AQUILAE 1995
    C. G. Mason and R. D. Gehrz, University of Minnesota; and C. E.
Woodward, University of Wyoming, report magnitudes for N Aql 1995
obtained on Mar. 23.6 UT with a bolometer at the Wyoming Infrared
Observatory's 2.3-m telescope, using a 10" beam and a 38" throw:  J
= 8.00 +/- 0.13, H = 7.21 +/- 0.03, K = 5.17 +/- 0.02, L = 2.79 +/-
0.04, M = 1.76 +/- 0.05, N = 0.75 +/- 0.20, [7.8 microns] = 0.84
+/- 0.06, [8.7 microns] = -0.26 +/- 0.09, [9.8 microns] = 0.90 +/-
0.19, [10.3 microns] = 1.58 +/- 0.15.  They add:  "The measurements
conform to a 970-K blackbody, suggesting recent dust formation.
The temperature is close to the 1000- to 1200-K dust condensation
temperatures observed in other novae.  We encourage visual
observers to monitor this nova, as it may be expected that the dust
will cause a DQ Her-type transition in the light curve."


RX J0558+53
     A. Allan, K. Horne, and R. W. Hilditch, St. Andrews University,
write:  "Based on V- and R-band CCD light curves between 1994 Nov.
24 and 1995 Feb. 22, we find a period of 272.7277(4) s for RX
J0558+53 (cf. IAUC 6129).  Power spectra show a peak at twice this
period, suggesting that the true spin period is 545.4555(8) s."


NOVA CENTAURI 1995
     F. Jablonski, Laboratorio Nacional de Astrofisica (LNA),
Itajuba, reports:  "UBV(RI)c photometry, obtained with the CNPq/LNA
0.6-m Zeiss telescope, yields the following average photometry for
N Cen 1995:  Mar. 16.27 UT, U-B = -0.55, B-V = +0.33, V = 9.89, V-R
= +1.36, V-I = +1.48; 17.19, -0.58, +0.29, 9.75, +1.34, +1.45;
18.21, -0.56, +0.36, 9.97, +1.36, +1.43; 19.19, -, -, 10.04, -, -.
The photometric errors are 0.01 mag in all bands, except U-B (0.02
mag); photometric transformations subject to the constraints
discussed by Jablonski et al. (1994, PASP 106, 1172).  CCD spectra
(resolution about 20000) obtained on Mar. 18.1 with the coude
spectrograph at the 1.6-m telescope show a strong interstellar feature
at 589.0/589.6 nm.  The total equivalent widths of the components
of the Na I doublet are 0.097 and 0.0742 nm.  Each feature is
resolved into two components with residual velocities with respect
to the local standard of rest of -22 and -1 km/s, respectively."


1995 April 3                   (6154)            Daniel W. E. Green

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