Central Bureau for Astronomical Telegrams
IAUC 3368: OAO 1653-40; HM Sge; HR 5110
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Circular No. 3368
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
OAO 1653-40
P. Byrne, A. Levine, F. Lang, C. A. Dobson, J. P. Doty, S. K.
Howe, F. A. Primini, W. A. Wheaton and W. H. G. Lewin, Massachusetts
Institute of Technology, report the position of a hard x-ray
source detected in the region of OAO 1653-40. Both spectral and
positional evidence strongly indicate that this source is the 38-s
pulsar (IAUC 3342). The four corners of the error region (1.5-sigma
level of confidence) are given by R.A. = 16h54m, Decl. = -41o40'; 16h54m.3,
-41o10'; 16h58m.6, -41o16'; 16h58m.3, -41o45' (equinox 1950.0). The
observations were made with the UCSD/MIT HEAO-A4 experiment in the
spinning mode. The error box clearly excludes V861 Sco, in agreement
with the HEAO-A3 result (IAUC 3342). When the A4 detector was
pointed in the above direction, 38-s pulsations were detected up to
about 80 keV.
HM SAGITTAE
P. A. Feldman and Sun Kwok, Herzberg Institute of Astrophysics,
and C. R. Purton, York University, Toronto, report that since its
initial radio detection in 1977 May (IAUC 3081), the young planetary
nebula HM Sge has exhibited a secular increase in its 2.8-cm
flux density at the rate of approximately 15 mJy/yr (cf. IAUC 3363).
This behavior is in agreement with the interacting-stellar-winds
model of Kwok and Purton (l979, Astrophys. J. 229, 187), which had
predicted the gradual emergence of the expanding shell at radio
wavelengths. The phenomenon of increasing flux density is expected
to manifest itself at progressively lower frequencies.
HR 5110
M. R. Viner, Queens University at Kingston, reports continuing
radio flare activity from the RS-CVn-binary HR 5110. Measurements
made with the 46-m telescope of the Algonquin Radio Observatory
over the 7 days since the discovery of radio flaring on May 29 by
P. A. Feldman show at least five distinct events with peak flux
densities of 300 to 400 mJy at 10.5 GHz. Minimum flux density during
this period was 135 mJy at 10.5 GHz.
1979 June 6 (3368) Daniel W. E. Green
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