Central Bureau for Astronomical Telegrams
IAUC 4232: HST; gamma Cas; 88 Her
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Read IAUC 4233
Circular No. 4232
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),
comunicates: "Following a recent annoucement by NASA officials that
the next Shuttle launch will be delayed until early 1988, STScI is
extending the 1986 Sept. 15 deadline (cf. IAUC 4190) for receipt
of Hubble Space Telescope (HST) observing proposals. Since a new
manifest listing the planned launch date for HST is expected to be
available later this year, the new proposal deadline will be
anounced in a later STScI newsletter and other communications. The
new deadline will be no earlier than 1987 Mar. 1 and will be
announced at least three months prior to the actual deadline date."
gamma CASSIOPEIAE
V. Doazan, Observatoire de Paris, communicates: "Remarkably
strong, narrow, absorption components of the N V, C IV and Si IV
resonance lines, shifted by ~ -1400 km/s, were observed with IUE
in the far ultraviolet spectrum of gamma Cas on June 26. Such high-
velocity components (HVCs) were frequently observed during 1978-
1982, when v/r > 1 in the Balmer emission lines, while they were
absent, undetectable or very weak during 1982-1985, when v/r < 1.
The recurrence of the HVCs in 1986 followed a change from v/r < 1
to v/r > 1 during 1985 Oct.-1986 Jan. This confirms our earlier
conclusion that long-term, far-ultraviolet and visual variability
patterns are correlated in gamma Cas. This is the fourth Be star
(after 59 Cyg, O CrB and 88 Her) for which such patterns have been
recognized. Intensive, simultaneous, far-ultraviolet and visual
observations are urgently needed during this renewed activity."
88 HERCULIS
Doazan also reports: "High-dispersion (1.2 nm/mm) spectra
obtained at the 1.5-m telescope of the Haute-Provence Observatory
using baked IIaO plates show that the singly-ionized metal shell
lines have progressively weakened from 1983 to 1986 and were almost
indetectable in 1986 May-June (except for the 423.3-nm Fe II
line). At the same time, the number of observable H shell lines
decreased. If 88 Her were to repeat the variability pattern
observed during 1968-1972, the star would be expected to undergo a
new quasinormal B phase in about a year. Photometric and spectroscopic
observations made simultaneously at far-ultraviolet, visual
and infrared wavelengths are urgently needed."
1986 July 18 (4232) Brian G. Marsden
Read IAUC 4233
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