Central Bureau for Astronomical Telegrams
IAUC 4759: 1989F; 1989E; H0414+00
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Read IAUC 4760
Circular No. 4759
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
SUPERNOVA 1989F IN ANONYMOUS GALAXY
M. Gaskell and A. P. Koratkar, Astronomy Department, University
of Michigan, report: "CCD spectra taken Mar. 16 with the 2.4-m at
the Michigan/Dartmouth/MIT (MDM) Observatory, covering 441-950 nm, show
that SN 1989F (cf. IAUC 4658) is of type II. The spectrum is
unusual in that only hydrogen is seen, but H-alpha is very strong with
the red wing extending to +14 000 km/s. There is very deep H-alpha and
H-beta absorption at -6900 km/s relative to the peaks and extending to
-11 000 km/s. This supernova might be related to the Zwicky class V
objects. The velocity of recession of the H-alpha peak is 900 km/s
and, if this is the velocity of the host galaxy, the supernova is
underluminous. The supernova light completely dominated the galaxy,
which might be underluminous."
SUPERNOVA 1989E IN MCG +5-32-45
Gaskell and Koratkar also write: "CCD spectra taken with the
2.4-m telescope at MDM Observatory on Mar. 5 confirm that this object
is a supernova. The supernova is superimposed on a large H II region.
The V magnitude (calculated from the spectra) is 19.3 +/- 0.15. The
spectrum is closest to that of a type-Ib supernova, 7 or 8 weeks after
maximum light. The strong 680-nm absorption of type-Ia supernovae is
absent, but the weak 610-nm absorption feature is weakly present. The
redshift of the host galaxy is 7900 km/s."
H0414+00
R. Falomo, Osservatorio di Padova; P. Bouchet, European
Southern Observatory, La Silla; and E. G. Tanzi, IFC CNR,
Milano, report: "The x-ray-selected BL Lac object H0414+00 was
observed in a bright state at the ESO 1.52-m reflector (+ CCD) on
Feb. 12: V = 16.8; alpha(lambda) = -0.8 (400 to 730 nm).
Quasi-simultaneous ultraviolet observations (Feb. 16) obtained with
the International Ultraviolet Explorer yield F(150 nm) = 2.2
x 10E-14 erg/cm2/s/nm, close to the flux extrapolated from the
optical range. J,H,K photometry obtained on Feb. 16 with the
ESO-MPI 2.2-m telescope yields K = 13.7, J-H = +0.6, H-K =+0.8, thus
indicating a marked flattening of the energy distribution at
infrared frequencies."
1989 March 16 (4759) Daniel W. E. Green
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