Central Bureau for Astronomical Telegrams
IAUC 3378: "NOVALIKE OBJECT" IN NGC 5272; III Zw 2; U Sco
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Read IAUC 3379
Circular No. 3378
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
"NOVALIKE OBJECT" IN NGC 5272
B. Mayer, PROBLICOM Sky Survey, informs us that this object
(cf. IAUC 3373) was again bright (mv ~ 12) on July 1. M. and W.
Liller, Harvard-Smithsonian Center for Astrophysics, report that
the object is almost certainly the 15-day-period W-Vir variable,
No. 154 in the listing for NGC 5272 by H. Sawyer Hogg (1973, Publ.
David Dunlap Obs. 3, No. 6).
III Zw 2
T. J. Balonek and W. A. Dent, University of Massachusetts; and
P. A. Feldman, B. H. Andrew and J. M. MacLeod, Herzberg Institute
of Astrophysics, report a strong radio outburst from the compact
galaxy III Zw 2 (cf. Schnopper et al. 1978, Astrophys. J. 222, L91).
The flux-density level reached ~ 2.7 Jy at 15.5 GHz in May-June.
At 10.8 GHz on June 27 it was 2.3 Jy; at 7.9 GHz on June 25 it was
2 Jy. VLBI and x-ray observations are especially urged.
U SCORPII
P. W. Hill, Anglo-Australian Observatory; and J. E. Pringle
and J. A. J. Whelan, Institute of Astronomy, Cambridge, report
spectroscopic observations of U Sco with the Anglo-Australian Telescope
on July 2 and 3. Emission in Balmer lines is present with several
components: broad, full width at zero intensity ~ 10 000 km/s;
narrow, split into two to four components separated by ~ 500 km/s.
Similar narrow emission in He II 4686 A is stronger than in the
Balmer lines. Strong, very broad emission between 4550 and 4750 A
is present on both nights, but there was a narrower 4640-4650 A
complex only on July 2. The spectrum is not unlike that of T CrB
(Herbig and Neubauer 1946, Publ. Astron. Soc. Pacific 58, 196). It
is confirmed that the outbursting star is the same as the quiescent
one identified by Webbink (1978, ibid. 90, 57). The nova has faded
rapidly since June 24 (to magnitude ~14 by July 3), and observations
of spectral development and intensities at all wavebands are
strongly urged.
Visual magnitude estimates by J. Bortle, Brooks Observatory:
June 26.11 UT, 10.4; 27.13, 11.0; 28.11, 11.3.
Corrigendum. The time of the observation by T. Cragg (IAUC
3373) should presumab1y read June 24.490 UT, not June 24.906.
1979 July 9 (3378) Brian G. Marsden
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