Central Bureau for Astronomical Telegrams
IAUC 3529: 4U 1849-31 = V1223 Sgr; 1E 0643.0-1648
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Read IAUC 3530
Circular No. 3529
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
4U 1849-31 = V1223 SAGITTARII
J. E. Steiner and the HEAO-A3 Group, Harvard-Smithsonian Center
for Astrophysics; and M. G. Watson, I. M. McHardy and J. P. Pye,
X-ray Astronomy Group, University of Leicester, write: "On the basis
of accurate HEAO-A3 and Ariel 5 ssi positions, we identify 4U
1849-31 with the irregular variable V1223 Sgr. This identification
is supported by a short observation made with the Einstein Observatory
IPC; Einstein MPC data obtained at the same time indicate the
x-ray source has a hard (kT ~ 8 keV) spectrum. Spectra of the star
taken at Cerro Tololo Interamerican Observatory show Balmer lines
in emission as well as He J and strong He II 468.6 nm + 464.0-465.0
nm. A series of eight short-exposure spectra taken with the 4-m
telescope do not show any significant variability. The optical
spectrum is typical of a cataclysmic variable."
Steiner, and F. J. Jablonski and I. C. Busko, Observatorio
Astrofisico Brasileiro, report: "UBV photometry of V1223 Sgr
obtained with the 1.6-m telescope at the Brazilian Astrophysical
Observatory show a 13.2-min period with amplitude ~ 10 percent.
Superimposed on this modulation there are short (~ 1 min) and long (~
1 hr) timescale variations. The magnitude and colors of the star
on Sept. 30 were V = 13.2, B-V = 0.06, U-B = -0.67. This star
shows remarkable similarities with H2252-035 (cf. IAUC 3511)."
1E 0643.0-1648
T. Chlebowski, J. P. Halpern and J. E. Steiner, Harvard-Smithsonian
Center for Astrophysics, communicate: "We have discovered a
new galactic x-ray source which is positively identified with a
star 9' south of Sirius. The position is (equinox 1950.0) R.A. =
6h43m03s.5, Decl. = -16o48'25". Optical and x-ray properties clearly
demonstrate that it is a cataclysmic variable, possibly of an AM
Her-type. Examination of the Harvard archive plates shows low (V ~
13.5) and high (V ~ 11) states. Optical monitoring with the 1.6-m
telescope at the Brazilian Astrophysical Observatory and x-ray
observations with the Einstein satellite both show flickering with
timescales from 1 to 10 min. Einstein observations also indicate a
hard spectrum (kT ~ 10 keV) with a flux of 3 x 10**-15 J m**-2 s**-1 keV**-1
at 3 keV when the source is at an x-ray high state. Optical spectra
taken at Cerro Tololo Interamerican Observatory show Balmer
lines, He I and variable He II in emission."
1980 October 28 (3529) Daniel W. E. Green
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