Central Bureau for Astronomical Telegrams
IAUC 4118: N Sco 1985; OPTICAL COUNTERPART OF M15 X-RAY SOURCE; 1985a
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Circular No. 4118
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
NOVA SCORPII 1985
On Sept. 24 W. Liller, Vina del Mar, Chile, reported his discovery
(as part of the PROBLICOM Survey) of a possible nova at R.A. =
17h53m19s4, Decl. = -31deg49'09" (equinox 1950.0, uncertainty 10"), 3'0
southeast of HV 9155 and 0'4 west of a mag 13 star. On the pair
of discovery exposures (Sept. 24.002 UT, panchromatic film, orange
filter) the object was of mag 10.5; on Sept. 19.0 it must have
been fainter than mag 12.0. Although limited requests for confirmation
were made, the only subsequent information received is from
Liller himself, who informs us that his objective-prism exposure
(135-mm lens, 30P prism, hypered 2415 film, red filter) on Oct.
5.0 clearly showed H-alpha [emission] and no continuum; his magnitude
estimate was 10.6 (Oct. 5.01, 2415 film, orange filter).
OPTICAL COUNTERPART OF M15 X-RAY SOURCE
P. A. Charles, D. C. Jones and T. Naylor, Oxford University;
and A. Boksenberg, Royal Greenwich Observatory, report: "We have
discovered He II 468.6-nm and H-alpha emission lines from an object in
the core of the globular cluster M15. The observations were made
with the Isaac Newton Telescope on La Palma (0.6-nm resolution
over the range 370-780 nm) on June 26. The east-west-aligned slit
had width 0"5, and spatial resolution was 1"5 along the slit; the
seeing was 1"2. The strong ultraviolet excess of AC 211 (Auriere
et al. 1984, A.Ap. 138, 415) was seen, but the emission lines
clearly arise from an object ~ 1"5 to the west. Hence the
variable star AC 211 is not the counterpart to the central x-ray
source (cf. IAUC 4101). Our observations are consistent with
either of the 16-17-mag stars AC 222 or AC 223 as the emission-
line object; both of these are within the Einstein x-ray error
circle (Grindlay et al. 1984, Ap.J. 282, L13). This supports the
interpretation of the x-ray source as a classical low-mass x-ray
binary, but the nature of AC 211 is unclear."
PERIODIC COMET ASHBROOK-JACKSON (1985a)
Total visual magnitude estimates: Aug. 10.24 UT, 13.2 (C. S.
Morris, Table Mountain Observatory, 0.61-m reflector); 11.28, 12.8
(Morris); 12.25, 13.0 (Morris); Sept. 7.25, 12.6 (A. Hale,
Lockwood Valley, CA, 0.20-m reflector.
1985 October 7 (4118) Brian G. Marsden
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