Central Bureau for Astronomical Telegrams
IAUC 3978: 1984i; 1984k; N Vul 1984
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Circular No. 3978
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
COMET AUSTIN (1984i)
Total visual magnitude estimates: Aug. 25.51 UT, 7: (A. Hale,
Wrightwood, CA, 10 x 50 binoculars; bright twilight, comet only 1 deg
from moon); 28.51, 5.9 (C. S. Morris, near Mt. Wilson, CA, 20 x 80
binoculars; tail 15' long); 28.51, 5.9 (Hale, near Mt. Wilson, CA).
PERIODIC COMET AREND-RIGAUX (1984k)
An independent recovery of this comet was also made by E.
Everhart at the Chamberlin Observatory's field station. The 30-
min exposure with the 0.40-m f/5.5 reflector showed a faint,
uniform, soft, diffuse, round image ~ 9" in diameter.
1984 UT R.A. (1950.0) Decl. m2
Aug. 9.41667 3 52 54.39 + 0 50 19.9 19
NOVA VULPECULAE 1984
L. Rosino, T. Iijima and P. Rafanelli, Asiago Astrophysical
Observatory, telex: "Spectra since discovery show broad emission
lines of hydrogen up to H16 (mean width 580 km/s), many lines
of Fe II (multiplets 27, 28, 37, 38, 42, 43, 45, 48, 49, 73 and
74), and lines due to Ca II 393.4 nm, Na I 589.3 nm, N II, O I and
Ti II. All the emissions are flanked by P-Cyg absorptions (system
I, mean radial velocity -610 km/s). On Aug. 4-5, when the nova
was near its maximum (mv ~ 6.3), most of the emission lines weakened
or disappeared, while the absorptions became stronger. During
the following nights, however, while the nova was declining,
the emission lines strengthened again. On Aug. 11 they appeared
distinctly split into two symmetric components (mean separation
580 km/s). The total width of the emission bands was ~ 1130 km/s,
the red component being slightly stronger than the blue. At the
same time a new absorption system (system II) emerged and strengthened,
and this soon became much stronger than system I. During
Aug. 18-23 the radial velocity of system I (H) was -795 km/s, and
that of system II was -1350 km/s. There were no other important
changes, except that the emission bands (still separated into two
components) were wider, and He I lines emerged at 587.5, 667.8 and
706.5 nm. Near-infrared spectra obtained on Aug. 18 showed strong
emissions of O I 777.3 and 844.6 nm; Ca II 849.8, 854.2 and 866.2
nm; and relatively weaker emissions due to H, Fe II, N I and O I."
1984 August 29 (3978) Brian G. Marsden
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