Central Bureau for Astronomical Telegrams
IAUC 6107: 1E 0035.4-7230 AND RX J0122.9-7521; X-RAY N IN Sco
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Circular No. 6107
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444 TWX 710-320-6842 ASTROGRAM CAM
MARSDEN@CFA.HARVARD.EDU or GREEN@CFA.HARVARD.EDU (science)
1E 0035.4-7230 AND RX J0122.9-7521
P. C. Schmidtke, A. P. Cowley, and T. K. McGrath, Arizona
State University; and J. B. Hutchings and D. Crampton, Dominion
Astrophysical Observatory, communicate: "Using data obtained at
Cerro Tololo Interamerican Observatory, we report observations of
two supersoft x-ray sources in the Small Magellanic Cloud.
1E 0035.4-7230 is found to have an orbital period of 0.1719
day, with minimum light at 1994 Nov. 3.105 UT, based on optical
photometry of the star (R.A. = 0h37m19s.8, Decl. = -72o14'13",
equinox 2000.0; Orio et al. 1994, A.Ap. 289, L11). The light curve
is nearly sinusoidal, with mean V = 20.2 and a range of about 0.4
mag. Average colors are B-V = -0.2 and U-B = -0.8. Spectra show a
blue continuum with only weak, variable emission lines of O VI
(528.9 nm), occasionally He II (468.6 nm), and a moderate-strength
unidentified feature at about 395.0 nm.
RX J0122.9-7521 (Kahabka et al. 1994, A.Ap. 288, 538) has been
optically identified with an extremely blue object at R.A. =
1h22m52s.9, Decl. = -75o21'13" (equinox 2000.0), with V = 15.5, B-V
= -0.4, U-B = -1.0. The spectrum is peculiar, with only a few
emission features, including He II (468.6 nm) and O VI (381.1,
383.4, 528.9 nm). Small changes in line flux and velocity are
observed on a timescale of hours or less."
X-RAY NOVA IN SCORPIUS
R. M. Hjellming and M. P. Rupen, National Radio Astronomy
Observatory, report: "The third x-ray outburst in GRO J1655-40,
observed with the Compton Gamma Ray Observatory BATSE (IAUC 6106),
was accompanied by a radio outburst observed with the Very Large
Array. On Nov. 1, one day after the initial reappearance of the
source to BATSE (cf. IAUC 6101), it was at the lowest radio flux
levels since initial detection in August: 8, 4, and 3.4 mJy at 1.4,
4.9, and 8.4 GHz. By Nov. 7, it increased its flux levels at the
same frequencies to 14, 10, and 10 mJy, followed by a more dramatic
increase to 50, 45, and 35 mJy on Nov. 11, and to 80, 76, and 72
mJy on Nov. 15. The next observation on Nov. 18 showed that it had
dropped to 31, 25, and 23 mJy. This behavior is similar to that of
the first two x-ray/radio events, with a slow increase in radio
emission during the rise of the x-ray outburst, and a stronger
increase in radio emission associated with the onset of the decay
of the x-ray event."
1994 November 22 (6107) Daniel W. E. Green
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