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IAUC 4459: 1987M; X-RAY PULSARS; N LMC; N Her 1987

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IAUC number 

                                                  Circular No. 4459
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444


SUPERNOVA 1987M IN NGC 2715
     A. V. Filippenko, University of California at Berkeley,
reports: "Preliminary analysis of high-quality CCD spectra (range
310-1000 nm, resolution 0.6-1.6 nm) obtained on Sept. 28 and 29
with the Shane 3-m reflector at the Lick Observatory shows that
this is a type I supernova, probably within 1 month past maximum
brightness.  The absence of a deep absorption trough at 615 nm
suggests that it is a member of the Ib subclass.  Other features
in the spectrum support this hypothesis.  Unlike most other SN Ib
objects, however, SN 1987M does not appear to be superposed on a
luminous HII region.  If the proposed classification is correct,
SN 1987M provides the first opportunity to observe the remarkable
transition to the 'supernebular phase' exhibited by old SN Ib
objects (Porter and Filippenko 1986, A.J. 93, 1372)."


X-RAY PULSARS
     F. Makino and the Ginga Team, Institute of Space and
Astronautical Science, Tokyo, reports: "Ginga observed several x-ray
pulsars during Mar.-June.  The heliocentric pulse periods in
seconds (with the uncertainty in parentheses in units of the last
decimal place shown) are provided for the objects and dates
indicated. With the exception of that for Vela X-1, the quoted pulse
periods have been corrected for Doppler effects due to the orbital
motion of the pulsar: GX 1+4, Mar. 30.8, 110.233 (3); SMC X-1, May
27.0, 0.710551 (5); Vela X-1, June 8.651, 283.13 (1); X2259+586,
June 22.3, 6.978760 (5); Cen X-3, June 22.4, 4.8230 (2)."


NOVA IN THE LARGE MAGELLANIC CLOUD
     Visual magnitude estimates by R. H. McNaught, Coonabarabran,
N.S.W.: Sept. 28.49 UT, 13.7; 28.78, 13.7; 30.75, 14.3.


NOVA HERCULIS 1987
     Visual magnitude estimates: July 23.60 UT, 12.3 (S. Sakuma,
Japan); 31.58, 12.8 (Sakuma); Aug. 5.82, 12.3 (A. Boattini,
Florence, Italy); 15.92, 12.5 (P. Schmeer, Bischmisheim, West
Germany); 20.92, 12.6 (Schmeer); 25.89, 12.3 (Boattini); 30.93, 12.5
(Boattini); Sept. 6.90, 12.5 (Boattini); 10.88, 12.5 (Boattini);
14.92, 12.5 (Boattini); 30.88, 13.0 (Schmeer).


1987 October 1                 (4459)              Brian G. Marsden

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