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IAUC 4686: NGC 4151; N Her 1987; AS 296; PU Vul

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                                                  Circular No. 4686
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


NGC 4151
     J. Clavel and W. Wamsteker, ESA IUE Observatory, communicate: "An
observation of NGC 4151 on Nov. 29 with the IUE SWP camera (range
120-195 nm) in its low resolution mode (900 km/s) showed this object
to be back to a bright state in the far ultraviolet.  The continuum
intensity at 145.5 nm is 6.2 +/- 0.2 mJy, while the C IV 155.0-nm
emission-line intensity and fwzi are 25.0 x 10**-12 erg cm-2 s-1 A-1
and 31 000 km/s, respectively.  Both the continuum and line
intensities are comparable to their values on 1979 Jan. 21 and are
intermediate between those on 1979 May 3 and 19, when NGC 4151 was at
the onset of its largest outburst ever recorded with IUE (Ulrich et
al. 1984, MNRAS 206, 221).  It therefore looks as if this Seyfert I
galaxy has at last recovered from its 8 years of semiquiescence
characterized by a faint continuum and weak and narrow emission lines.
The L1 159.4 and L2 151.8 features that Ulrich et al. (1985, Nature
313}, 745) tentatively identified with redshifted and blueshifted C IV
155.0 components excited by the two-sided radio-jet seem to have
disappeared.''


NOVA HERCULIS 1987
     Visual magnitude estimates: Aug. 17.91 UT, 14.7 (A. Boattini,
Montecarmo, Italy); Sept. 7.89, 14.7 (Boattini, Piazzano, Italy); 18.86,
15.5 (M. Verdenet, Bourbon-Lancy, France); Nov. 6.74, 15.4 (Verdenet).


AS 296
     Visual magnitude estimates (cf. IAUC 4628): July 15.50 UT, 10.2 (P.
Williams, Heathcote, N.S.W.); 24.90, 10.1 (S. Korth, Dusseldorf, West
Germany); Aug. 4.97, 9.9 (P. Schmeer, Bischmisheim, West Germany);
13.96, 10.0 (Schmeer); 20.45, 10.0 (Williams); 31.54, 9.8 (A. Pearce,
Woodlands, Western Australia); Sept. 6.85, 9.9 (Schmeer); 17.45, 10.1
(Williams); 28.45, 10.2 (Williams); Oct. 8.39, 10.2 (Williams).


PU VULPECULAE
     Visual magnitude estimates (cf. IAUC 3589, 4474): Sept. 12.05 UT,
9.7 (A. Pereira, Cabo da Roca, Portugal); 21.04, 9.7 (Pereira); Nov. 1.87,
10.0 (S. Baroni, Milan, Italy); 5.79, 9.9 (A. Boattini, Florence,
Italy), 25.75, 9.8 (Boattini).


1988 December 5                (4686)              Brian G. Marsden

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