Central Bureau for Astronomical Telegrams
IAUC 5223: N Her 1991
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 5224
Circular No. 5223
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 HERCULIS 1991
T. E. Harrison, Mount Stromlo Observatory, reports: "P. te
Lintel Hekkert and I obtained infrared magnitudes on Mar. 25.7 UT
with the 2.3-m telescope (+ IRPS) at Siding Spring: J = 5.06, H =
4.64, K = 4.16, L = 3.59 (all good to +/- 0.05 mag). Infrared
spectroscopy with CIGs shows very broad lines of hydrogen, including Pa-
beta and Pa-gamma, Br-gamma, and the Br10-Br14 series. The lines
are several times the width of those seen in V3890 Sgr (IAUC 5007).
No evidence for He I emission (at 2.06 microns) is present."
M. Della Valle, European Southern Observatory, La Silla; and M.
Turatto, Padova Observatory, report: "Photometric magnitudes derived
by G. Cutispoto (Catania Observatory) at the ESO 0.50-m telescope on
Mar. 26.4 UT are: V = 7.6, B-V = +0.5, U-B = -0.7, V-R = +1.0, V-I =
+1.3. Infrared magnitudes by A. Moneti (ESO) at the ESO/Max-Planck-
Institut 2.2-m telescope (+ IRAC) are: H = 5.3, H-K = +0.6. A
spectrogram (resolution 0.2 nm, range 475-580 nm) obtained by W.
Zelinger (ESO) at the 1.5-m telescope on Mar. 26.4 shows broad H-beta
(FWZI about 6000 km/s) and Fe II (multiplets 42, 48, 49) emission
lines. A lower-resolution spectrogram (1.0 nm, range 400-830 nm),
taken by M. Della Valle and E. Giraud (ESO) at the New Technology
Telescope (+ EMMI) on Mar. 26.4, appears dominated by broad Balmer
emission lines. In particular, H-alpha (FWZI about 7000 km/s) and
H-beta exhibit weak P-Cyg absorptions. Other emissions are visible
at 410 nm (H-delta), 435 nm (H-gamma, FWZI about 6600 km/s), 460 nm
(N II), and 589 nm (Na I)."
G. M. Hurst, Basingstoke, England, reports the following precise
position measured by D. Buczynski from his Mar. 25.21 UT exposure
(the same time as was given erroneously on line 14 of IAUC 5222):
R.A. = 18h44m12s.01, Decl. = +12 10'44".3 (equinox 1950.0). R. H.
McNaught, University of Adelaide, reports the following position
obtained from an Uppsala Southern Schmidt telescope film: R.A. =
18h44m11s.83, Decl. = +12 10'45".0 (equinox 1950.0; uncertainty
0".3-0".4 in each coordinate). He notes that no blue star appears
near this position on the Palomar Sky Survey, but the nearest candidate
(star 1, below) is somewhat brighter on the red print than the
blue. End figures for R.A. and Decl. of the three nearest stars
are: Star 1 (mag about 19), 12s.05, 44".3; Star 2 (mag about 14),
11s.67, 52".0; Star 3 (partially obscured by Star 2; mag about 16),
11s.92, 52".1.
1991 March 26 (5223) Daniel W. E. Green
Read IAUC 5224
Our Web policy. Index to the CBAT/MPC/ICQ pages.
