Central Bureau for Astronomical Telegrams
IAUC 3274: N Cyg 1978; NGC 7213; PSR 0833-45
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Circular No. 3274
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
NOVA CYGNI 1978
E. F. Guinan, G. P. McCook and S. Tomczyk, Department of
Astronomy, Villanova University, write: "Photoelectric wide- and
narrow-band 6565 and 7774 A observations of Nova Cyg 1978 were made
at Villanova University Observatory on Sept. 15.04-15.12 and 16.03-16.16
UT. Observations indicate variations in the wide-bandpasses
of ~ 0.08 magnitude over the first night and of less than ~ 0.03
magnitude on the second night. The apparent brightnesses were
about the same on both nights. An increase in net emission at H-alpha
and at O I (7774 A) was also observed between the two nights."
Corrigendum. On IAUC 3270, line 19, for strong structure at
3920 A read strong structure at 3820 A.
Visual magnitude estimates: Sept. 19.03 UT, 7.6 (J. De Young,
Huntington, WV); 19.16, 7.7 (J. Morgan, Prescott, AZ); 20.16, 7.7
(M. Mattei, Littleton, MA); 20.39, 7.6 (D. Wallentinsen, Albuquerque,
NM); 21.11, 8.2 (W. Hawley, Concord, NH); 22.35, 8.0 (P. L.
Collins, Mount Hopkins Observatory); 23.03, 8.2 (L. C. Peltier,
Delphos, OH); 24.02, 8.3 (C. Hurless, Lima, OH).
NGC 7213
D. A. Allen, M. G. Smith and A. E. Wright, Anglo-Australian
Observatory; M. Ward, University of Sussex; and A. S. Wilson,
University of Maryland, report 1-4-um photometry of the lenticular
Seyfert x-ray galaxy NGC 7213 described by Phillips (IAUC 3256).
In a 7" aperture K = 9.4, H-K = +0.5, J-H = +0.9, K-L = +1.1. The
observations were made with the Anglo-Australian Telescope on Sept.
14. The infrared colors resemble those of conventional spiral
x-ray and Seyfert galaxies.
PSR 0833-45
G. S. Downs, Jet Propulsion Laboratory, reports that the period
of the Vela pulsar (PSR 0833-45) decreased by ~ 272 ns between
June 21 and July 14. Arrival times measured between Aug. 8 and
Aug. 25 at Goldstone Deep Space Station indicate dP/P = (-3.0475 +/-
0.0001) x 10**-6 and dP-dot/P-dot = (8.8 +/- 0.1) x 10**-3. Using data obtained
between July 30 and Sept. 1 at Tidbinbilla Deep Space Station,
R. N. Manchester and L. M. Newton confirm the jump and give dP/P =
(-3.18 +/- 0.02) x 10**-6 and dP-dot/P-dot = (9.6 +/- 0.1) x 10**-3.
1978 September 25 (3274) Brian G. Marsden
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