Central Bureau for Astronomical Telegrams
IAUC 4862: N Sct 1989; 1987A
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Circular No. 4862
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
NOVA SCUTI 1989
R. Barbon and L. Rosino, Asiago Astrophysical Observatory,
write: "Spectroscopic observations of Wild's possible nova (cf.
IAUC 4861) were obtained at Asiago with the 1.22-m telescope on
Sept. 23.8 UT. A preliminary analysis indicates that the spectrum
is that of a nova in its early decline, showing broad emission lines
of H, O I (777.4 nm), He I (587.6 nm), Fe II (multiplets 42, 48,
49, 73, 74, 200), N II, and a very faint blend of N III at 464.0 nm.
No P-Cyg absorption system has been observed, due to the weakness of
the continuum in our spectra. The strongest emission line is
H-alpha, with a halfwidth corresponding to an expansion velocity of
about 1400 km/s. The average expansion velocity derived by the
halfwidths of the other lines (including H-beta) is lower, being
about 915 km/s."
H. Bond, Space Telescope Science Institute, communicates:
"Spectra of Nova Sct 1989 were obtained at Cerro Tololo Interamerican
Observatory on Sept. 25.00 UT by J. Huchra (Center for Astrophysics)
and R. Olowin (St. Mary's College) with the 4-m telescope, and by A.
Layden (Yale University) with the 1-m telescope. The spectra show
strong emission lines of the Balmer series, Ca II H and K, and
numerous strong Fe II lines; for H-beta, Huchra measures 1600 km/s
FWHM and 2500 km/s FWZI, both corrected for the instrumental resolution.
There are no obvious absorption features in the continuum, other than
possible interstellar absorption at 443 nm. Photometry obtained by A.
Landolt (Louisiana State University) with the CTIO 1.5-m telescope on
Sept. 25.03 yields V = 10.48, B-V = +0.49, U-B = -0.35, V-R = +0.75,
R-I = +0.73."
R. H. McNaught, Siding Spring Observatory, reports the following
position from an Uppsala Southern Schmidt exposure: R.A. =
18h46m58s.15, Decl. = -6 14'45.6 (equinox 1950.0). No star appears at
this location on the Palomar Sky Survey, ESO B fields, and U.K. Schmidt
J, R, and I plates; an outburst range of at least 13 mag is thus
indicated. Preliminary magnitude estimates (from T-Max 400 film,
unless otherwise noted): Sept. 5.59 UT, [12.0; 7.62, [8.5; 8.64, 9.5;
17.41, 8.5; 18.49, 9.0; 20.44, 10.3; 21.58, 10.9; 23.46, 11.0; 24.39,
11.2 (visual); 24.61, 11.2: (visual).
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
Visual magnitude estimates by A. Pearce, Scarborough, W.
Australia: Aug. 25.85 UT, 13.5; 31.84, 13.5; Sept. 1.84, 13.6;
3.85, 13.6; 8.84, 13.7.
1989 September 25 (4862) Daniel W. E. Green
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