Central Bureau for Astronomical Telegrams
IAUC 4190: HST; 1986B; VERY BLUE Var IN Ori
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 4191
Circular No. 4190
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
HUBBLE SPACE TELESCOPE
R. Giacconi, Space Telescope Science Institute (STScI), telexes:
"The temporary halt of the Space Shuttle program following the
Challenger tragedy will likely cause a delay in the launch of the
Hubble Space Telescope (HST). Although a launch date has not been
established, we are extending the deadline for receipt of HST
observing proposals at STScI by 5.5 months, to 1986 Sept. 15. If the
launch is delayed much longer than currently estimated and should
there be compelling scientific reasons, successful proposers may be
allowed to review and, if necessary, modify their proposals 1 year
prior to launch. Proposals can be submitted at any time prior to
Sept. 15. Those proposals already at the STScI will be processed
unless a request for their return or revision is received."
SUPERNOVA 1986B IN NGC 5101
A. V. Filippenko and K. Ebneter, University of California at
Berkeley, report that spectra of supernova 1986B (IAUC 4177, 4185)
obtained on Mar. 4 UT with the Lick 3-m telescope (range 320-720
nm; 1-nm resolution) show it to be a type-I object, 4 +/- 1 months
past maximum brightness. Broad emission and absorption lines are
present; the emission feature at 465 nm is especially intense. R.
P. Kirshner and P. F. Winkler also confirm, from spectra (range
610-780 nm) taken Mar. 5 at Cerro Tololo, that the object is a
typical type-I supernova many months past maximum, a classification
consistent with the present apparent magnitude of the object.
Supernova 1986B shows broad features that resemble those seen in the
type-I supernova 1972E in NGC 5253 at age 200 days.
VERY BLUE VARIABLE IN ORION
Filippenko and Ebneter also write: "We have obtained high-
quality spectra of the very blue variable in Orion (IAUC 4172) on
Mar. 4 UT with the Lick 3-m reflector (range 320-720 nm, resolution
1 nm). Preliminary analysis reveals relatively strong H-alpha and H-beta
emission lines superposed on a nearly featureless continuum. Also
visible are somewhat broader high-order Balmer absorption lines.
The corresponding emission lines fill in the centers of the
absorption lines, so that the continuum would appear to be completely
featureless in spectra of lower resolution or poorer quality. The
object is probably a Be-type star."
1986 March 7 (4190) Daniel W. E. Green
Read IAUC 4191
Our Web policy. Index to the CBAT/MPC/ICQ pages.
