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IAUC 6400: C/1995 O1; C/1996 J1; EMISSION OBJECT IN Cyg

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                                                  Circular No. 6400
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1995 O1 (HALE-BOPP)
     H. Rauer, Observatoire de Paris-Meudon; H. Bohnhardt,
University Observatory, Munich; F. Colas, Bureau des Longitudes; J.
Crovisier, Observatoire de Paris-Meudon; and L. Jorda and N. Thomas,
Max-Planck-Institut fur Aeronomie, report on observations of this
comet on Apr. 27 UT with the 1.54-m Danish telescope (+ DFOSC) at
the European Southern Observatory:  "Spectra (range 350-750 nm)
show sublimation of CN(0-0) at 388 nm, C2(0,0) at 516 nm, C2(1,0)
at 475 nm, and C3 at 405 nm.  C2 emission extends to at least 7 x
10E5 km from the nucleus, while CN can be observed up to 2 x 10E5
km in the much-noisier blue part of the spectrum.  A preliminary
data reduction for spectra taken on Apr. 27.29 UT gives production
rates of log Q(CN) = 26.8 and log Q(C2) = 26.7, using a Haser model
with scale length after Cochran et al. (1992, Icarus 98, 151)."


COMET C/1996 J1 (EVANS-DRINKWATER)
     R. M. West and L. Ramirez, European Southern Observatory, have
obtained a 30-min spectrum (range 370-900 nm, resolution 0.8 nm) of
comet C/1996 J1 with the MPI/ESO 2.2-m telescope (+ EFOSC II) at La
Silla on May 14.15 UT.  The slit (1".5 wide, 5'.7 long at p.a. 90
deg) was centered on the diffuse central condensation, which shows
a solar-type spectrum with weak emission lines of CN (388 nm,
extending to about 100" on either side) as well as C2 (516 nm).
     Total visual magnitude estimates by A. Hale, Cloudcroft, NM
(0.41-m reflector):  May 15.20 UT, 13.6; 16.18, 13.5.


EMISSION OBJECT IN CYGNUS
     P. Garnavich and P. J. Green, Harvard-Smithsonian Center for
Astrophysics, report: "Spectra (range 350-900 nm; resolution 0.8 nm
FWHM) of the object reported on IAUC 6387 were obtained with the
Multiple-Mirror Telescope on May 12.  The spectra (two 900-s
exposures) show a featureless continuum rising sharply to the red.
The estimated magnitudes are R = 19.7, I = 17.4.  Assuming an
intrinsic color of B-V = 0.0, the estimated interstellar absorption
is 8 magnitudes in the visual band.  No emission lines are seen.
This implies a flux limit for H-alpha of < 2 x 10E-16 erg cmE-2
sE-1.  The red continuum, combined with a lack of absorption bands,
suggests that this is a heavily obscured early-type star with
highly-variable emission-line strength."

                      (C) Copyright 1996 CBAT
1996 May 17                    (6400)            Daniel W. E. Green

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