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IAUC 3340: SN IN NGC 3913; U Gem; VV Pup; HR Del

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                                                  Circular No. 3340
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM     Telephone 617-864-5758

     L. Rosino, Asiago Astrophysical Observatory, reports the
discovery of a supernova 40" east and 20" north of the nucleus of NGC
3913.  Photographic magnitudes: Feb. 28, 16; Mar. 3.93 UT, 14.8.

     J. Mattei, American Association of Variable Star Observers,
communicates visual magnitude estimates: Mar. 23.15 UT, 13.2 (P.
Goodwin, Shreveport, LA); 23.16, 13.3 (J. Morgan, Prescott, AZ);
23.33, 12.6 (Morgan); 24.10, 9.2 (Morgan); 24.11, 9.4 (Goodwin).

     N. Visvanathan, Mount Stromlo and Siding Spring Observatories;
and D. T. Wickramasinghe, Australian National University, report:
"Spectroscopic observations of the dwarf nova VV Pup in the range
3600-7000 A were made every 4 min for a period of 140 min on Feb 2.
The spectra were obtained with the 380-cm telescope using the
image-dissector scanner attached to the Boller and Chivens spectrograph.
Our bright (V = 15.6) and faint (V = 17.56) phases agree with
Walker's standard ephemerides.  Neutral H as well as He lines are
seen in emission essentially at all phases.  The spectra during the
bright phases show hitherto unreported broad absorption bands centered
at 4100-4600, 4600-5300 and 5200-6000 A, suggestive of a late-type
star spectrum.  As most of the light during the bright phase
is believed to come from hot plasma near the magnetic pole of the
white dwarf, the observed absorption features could also be interpreted
as due to the sixth, seventh and eighth cyclotron self-absorption
harmonics at a field of 30 MG."

     P. Tempesti, Collurania Observatory, writes: "The record of a
7-hr photoelectric run on the nova HR Del performed on 1977 Aug.
16-17 has been examined in order to reveal a possible photometric
counterpart of the spectroscopic periodicity found by Hutchings
(IAUC 3310).  The star was found to be variable between V = 12.00
and V = 12.20; five minima have been observed, and their times
appear to be consistent with periods of 0.07 or 0.14 day."

1979 March 26                  (3340)              Brian G. Marsden

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