Central Bureau for Astronomical Telegrams
IAUC 4354: 1987A; 1986h
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Circular No. 4354
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 1987A IN THE LARGE MAGELLANIC CLOUD
P. Meikle, Imperial College, London; J. Graham, Lawrence
Berkeley Laboratory, University of California; and B. Gregory, Cerro
Tololo Interamerican Observatory, communicate: "We have obtained
infrared photometry and spectroscopy of SN 1987A during Mar. 15.04-
15.09 UT using the cooled grating spectrometer (resolution 500) on
the CTIO 4-m telescope. The infrared magnitudes were J = 2.64, H =
2.40, K = 2.20, and L = 1.73, corresponding to fluxes that are about 60
percent brighter than those reported on IAUC 4347 for Mar. 5-8. H
I lines observed were 5-3, 5-4, 7-4, and 8-5; all these lines
exhibit broad P-Cyg profiles. The rest-wavelength to trough-
wavelength velocity differences are considerably lower than those derived
from lower series (Balmer) lines at the same epoch, and are about
60 percent of the velocities observed in the same infrared lines on
Mar. 5-8 (IAUC 4347). The low infrared line velocities suggest
that they are formed much closer to the region of continuum emission
than are the Balmer lines, and that this region was already
deep within the ejecta in mid-Mar."
M. G. Pastoriza and T. Scorchi-Bergmann, Instituto de Fisica,
Universidad Federal Rio Grande do Sul, report: "Using the CTIO 1-m
telescope (+ 2D-Frutti detector), we observed the spectral region
370-700 nm (resolution 0.5 nm) during Feb. 25-Mar. 5, and have
obtained flux values (comparison star eta Hya) for four wavelengths
selected to represent the continuum: 442 nm was chosen between the
emission lines of H-gamma and Fe II (458.3 nm), and the others are from
regions free of lines. The standard deviations of the flux values
obtained for the comparison star delta Dor during the seven nights are:
442 nm, 4; 535 nm, 4; 585 nm, 4; 702 nm, 16. The fluxes are given
in units of 10E-11 ergs/s/cm**2/A: Feb. 27.01 UT, F(442 nm) = 8.4,
F(535 nm) = 6.4, F(585 nm) = 5.6, F(702 nm) = 4.4; 28.01, 7.4, 6.4,
5.2, 4.0; Mar. 1.07, 5.9, 5.1, 4.3, 2.5; 2.06, 5.0, 5.7, 5.2, 2.5;
3.04, 5.0, 6.2, 5.6, 3.2; 4.02, 4.8, 6.2, 5.8, 3.0; 5.01, 4.3, 6.9,
6.4, 2.9. The estimated maximum of the flux distribution shifted
from 420 nm on Feb. 27 to 520 nm on Mar. 5."
PERIODIC COMET SCHWASSMANN-WACHMANN 2 (1986h)
Total visual magnitude estimates (cf. IAUC 4312): Mar. 5.15
UT, 12.6 (A. Hale, Las Cruces, NM, 0.20-m reflector); 18.16, 12.9
(C. S. Morris, Lockwood Valley, CA, 0.26-m reflector); 20.14, 12.7
(Hale).
1987 March 26 (4354) Daniel W. E. Green
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