Central Bureau for Astronomical Telegrams
IAUC 3729: NOVAE IN M31; PSR 0833-45; R Aqr
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Read IAUC 3730
Circular No. 3729
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 617-864-5758
NOVAE IN M31
C. Christian, Canada-France-Hawaii Telescope Corporation; and
R. Schommer, Rutgers University, observed Nova 4 in M31 (IAUC
3725) on Sept. 27 with the 4-m telescope at Kitt Peak. They report
that the nova showed strong, broad (400-nm FWHM) H-beta emission,
which has a possible P-Cyg line profile, superposed on a blue continuum.
The spectrum also shows weak H-gamma and H-delta emission.
G. Jacoby, Kitt Peak National Observatory; R. Ciardullo,
University of California at Los Angeles; and H. Ford, Space Telescope
Science Institute, report finding yet another nova, Nova 5, in the
same galaxy. It was not present on Sept. 12, had an H-alpha mag of
16.95 on Sept. 16 and rose to mag 15.15 by Sept. 23. The blue mag
peaked at 17.5 on Sept. 20 and declined to 18.2 by Sept. 23. The
positions of the nova and a nearby reference star are:
R.A. (1975) Decl.
Nova 5 0 41 45.81 +41 09 18.9
Ref. star 0 41 37.03 +41 10 35.5
PSR 0833-45
P. A. Hamilton, P. M. McCulloch and G. W. R. Royle, University
of Tasmania, report observing an abrupt decrease in the period
of the Vela pulsar PSR 0833-45 on Aug. 10.645 UT. The fractional
change at that time in pulse frequency was (2.034 +/- 0.003) . 10**-6
and in the frequency derivative was 0.042 +/- 0.004. These results
were derived from 635-MHz observations at Hobart during June 17-
Sept. 16. As the actual jump was not observed its epoch was computed
by assuming no discontinuity in phase at the time of jump.
R AQUARII
S. Tapia and E. R. Craine, Steward Observatory: and G.
Jacoby, Kitt Peak National Observatory, write: "Blue and visual
images of R Aqr, obtained on Sept. 23 and 24, reveal an 8" elongated
extension at p.a. 26 that has apparently not been observed
before. Approximate magnitude and colors of the central part of
the extension are V = 13.5, B-V = -0.4, U-B = +2.0. Indications
of a very small extension in the opposite direction suggest that
some violent ejection may have taken place during the current
minimum of this variable."
1982 October 1 (3729) Brian G. Marsden
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