Central Bureau for Astronomical Telegrams
IAUC 3351: H 0622-529; SN IN NGC 4321; NOTICE RE Tlgms
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Circular No. 3351
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
H 0622-529
G. R. Riegler and P. C. Agrawal, Jet Propulsion Laboratory;
and G. P. Garmire, California Institute of Technology, report the
detection of x-radiation from a source H 0622-529 with the low-energy
detectors of the HEAO A-2 experiment. The source is highly
variable: it was detected only during 1977 Oct. 6-9 and could not
be found again in 1978 Apr. In the 0.4-3-keV band the average flux
was (3.1 +/- 0.7) x 10**-11 erg cm**-2 s**-1; the source was not detected
in the 0.15-0.4-keV band. The error box is centered at R.A. = 6h22m.5,
Decl. = -52o57'.6 (equinox 1950.0), with 90-percent-confidence extent +/-
0o.44 in ecliptic latitude and +/- 2o.7 perpendicular thereto. No
unambiguous identification is available, but it should be noted that
the nearby bright star alpha Car is near the center of the error box.
SUPERNOVA IN NGC 4321
G. F. O. Schnur, European Southern Observatory, reports on
spectroscopic observations made of this object on Apr. 21. They
were obtained at a dispersion of 171 A/mm and covered the range
3825-7100 A. The 360-cm telescope was used, an image-dissector
scanner being attached to a Poller and Chivens spectrograph. On top of
a rather blue continuum H-alpha, H-beta, H-gamma and possibly H-delta were
detected in emission, together with absorption features shifted by
~ 35 A blueward of H-alpha and H-beta. The radial velocity of the emission
peaks agrees with the known radial velocity of NGC 4321. The
emission band at 5900 A can be identified with He I. A strong absorption
feature of width 30 A is detected at 5130 A. Further visible
absorption and emission features remain to be identified. A further
spectrogram obtained on Apr. 22 by H. Pederson with the same
equipment shows small variations from the Apr. 21 observations.
NOTICE CONCERNING TELEGRAMS
It is once again an 'open season' for making changes in the
lists of subscribers to the Central Bureau's telegram service.
This applies principally to deletions, address changes and changes
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said changes by May 31.
1979 April 24 (3351) Brian G. Marsden
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