Central Bureau for Astronomical Telegrams
IAUC 4634: 3C 279; DETECTION OF CO IN I Zw 1; R CrB
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Circular No. 4634
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
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
3C 279
B. M. Peterson, R. M. Wagner, and K. T. Korista, Ohio State
University write: "The optical spectrum of the currently active
quasar 3C 279 was recorded with the 1.8-m Perkins telescope (+ OSU
Image Dissector Scanner) at the Lowell Observatory on July 6.17-6.20
UT, which was concurrent with Ginga x-ray observations (IAUC 4626,
4628) and one day after observations were made with the International
Ultraviolet Explorer (IAUC 4632); the observations were made using
the Columbus Project prototype remote observing system in Columbus.
The spectrum covers the wavelength range 400-640 nm (resolution 0.9
nm), with S/N approximately 50/1. No lines were detected other than
very weak Na D absorption at zero redshift. Mg II (279.8 nm) is the
strongest line previously detected in this spectral range. The
continuum flux at 500 nm is 2.09 (+/- 0.06) x 10E-13 erg s-1 cm-2 nm-1,
and the energy spectral index in the optical is about 1.9 +/- 0.2.
The optical flux is more than an order of magnitude higher than the
brightest stage reported by Oke (1967, Ap.J. 147, 901), when the
equivalent width of Mg II (279.8 nm) was only 1.8 nm. This source
should be monitored in anticipation of a corresponding increase in
the broad emission line fluxes."
DETECTION OF CO IN I Zw 1
D. Alloin, Paris Observatory; R. Antonucci, Space Telescope
Science Institute; and R. Barvainis, National Radio Astronomy
Observatory, telex: "We report the detection with the IRAM 30-m
telescope of CO in the quasar I Zw 1, at redshift z = 0.0611. Both
CO(J = 1-0) 115.27-GHz and CO(J = 2-1) 230.55-GHz lines are detected
at levels of 4.65 and 5.10 K km s-1, respectively. The two-peaked
velocity profile in the CO(J = 1-0) transition is quite similar to
that of the H I 21-cm line in I Zw 1. After correction for beam
dilution effects, the CO(J = 2-1)-to-CO(J = 1-0) line ratio appears
to be less than unity in I Zw 1."
R CORONAE BOREALIS
J. A. Mattei, AAVSO, notes that this variable star last had
shallow (mv = 7.3) and deep (mv = 10.5) minima in 1986 Apr. and in
1985 Oct., respectively. Further visual magnitude estimates (cf.
IAUC 4633): July 27.41 UT, 7.4 (P. Williams, Heathcote, N.S.W.);
28.40, 7.5 (Williams); 28.85, 7.3 (E. Schweitzer, Strasbourg, France);
29.18, 7.4 (J. Griese, Stamford, CT).
1988 July 29 (4634) Daniel W. E. Green
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