Central Bureau for Astronomical Telegrams
IAUC 4851: 1989O, 1989P; 1989o
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Read IAUC 4852
Circular No. 4851
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
SUPERNOVAE 1989O AND 1989P
A. V. Filippenko and J. C. Shields, University of California
at Berkeley, communicate: "A spectrum (range 402-721 nm,
resolution 1-2 nm) of SN 1989P obtained on Sept. 8 UT with the
Shane 3-m reflector at Lick Observatory confirms its classification
as type Ia, 1-2 months past maximum (cf. IAUC 4850), rather than
as type II (cf. IAUC 4847). A fully-reduced spectrum (range
402-988 nm) of SN 1989O indicates that this is a type-II supernova
at a redshift of 0.064, not a type-Ia supernova as suggested
previously (cf. IAUC 4846, 4849). H-alpha and Na I D exhibit
shallow P-Cyg profiles, with absorption minima at 669 and 611 nm,
respectively. The overall spectrum appears somewhat peculiar. It
most closely resembles that of SN 1987K (Filippenko 1988, A.J. 96,
1941) within one week past maximum brightness. Further monitoring
of SN 1989O should reveal whether it changes into a type-Ib
supernova, as did SN 1987K. A foreground star is superposed on
the parent galaxy, MCG 6-1-26, whose redshift was obtained from
a spectrum of an outer H II region."
PERIODIC COMET BRORSEN-METCALF (1989o)
P. Colom, Institut de Radio Astronomie Millimetrique (IRAM)
and Observatoire de Paris-Meudon; D. Despois, Observatoire de
Bordeaux; G. Paubert, IRAM; and D. Bockelee-Morvan, J. Crovisier,
and E. Gerard, Observatoire de Paris-Meudon, report: "We made
observations of parent molecules in P/Brorsen-Metcalf with the
IRAM 30-m millimeter telescope during Sept. 2-7. From a quick-look
analysis, HCN is detected through its J(1-0) transition at 89 GHz
(line area for the sum of the two strongest hyperfine components:
0.16 +/- 0.03 K km sE-1) and probably its J(3-2) transition at 266
GHz (line area 0.7 +/- 0.2 K km sE-1); the derived HCN production
rate is about 2 x 10E26 sE-1. The HCN line widths are about
2 km sE-1 (HPW). H2CO is marginally detected through its
3(1,2)-2(1,1) transition at 226 GHz (line area 0.15 +/- 0.05 K km
sE-1); the corresponding formaldehyde production rate is on the
order of 10E27 sE-1."
Total visual magnitude estimates by C. S. Morris with 10x50
binoculars: Sept. 5.49 UT, 5.6 (at Pine Mountain Club, CA); 7.51, 5.9
(Whitaker Peak, CA); 8.51, 5.9 (near Mt. Wilson, CA; 6-deg tail); 9.51,
5.9 (6-deg tail); 10.51, 5.9 (6-deg tail); 11.51, 5.9 (6-deg tail).
1989 September 11 (4851) Daniel W. E. Green
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