Central Bureau for Astronomical Telegrams
IAUC 8363: UNUSUAL CATACLYSMIC Var IN Her
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Circular No. 8363
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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UNUSUAL CATACLYSMIC VARIABLE IN HERCULES
On June 16, S. Nakano (Sumoto, Japan) reported the discovery
by Yuji Nakamura (Kameyama, Mie-ken, Japan) of a possible nova (mag
11.5) on Tri-X photographs taken on June 13.632 UT with a 200-mm
f/4 telephoto lens; the new object was reported by Nakamura to be
located at R.A. = 18h39m26s.4, Decl. = +26o04'09" (equinox 2000.0;
uncertainties +/- 30"), and he added that nothing was visible
around this position on approximately 50 patrol films taken during
1999-2004 (limiting mag 12). K. Itagaki (Yamagata, Japan, 0.60-m
f/5.7 reflector) reports the following position end figures from a
CCD image obtained on June 20.488 (with the object at mag 12.8):
26s.16, 09".8. J. Bedient (Honolulu, HI) reports that images taken
on June 22 with the University of Hawaii 2.2-m reflector suggest
that the star in outburst is the western star of a close pair; his
position end figures for the variable are 26s.16, 10".0, which he
notes is 1".3 north of 2MASS 18392619+2604087. Following a request
by the Central Bureau, T. Matheson, P. Challis, and R. Kirshner
(Harvard-Smithsonian Center for Astrophysics) report that a
spectrogram (range 370-750 nm), obtained by E. Adams on June 23.32
with the Mt. Hopkins 1.5-m telescope (+ FAST), shows it to be a
cataclysmic variable. The spectrum consists of a blue continuum
with double-peaked emission lines of hydrogen; the full-width-at-
half-maximum of the H_alpha line is 2000 km/s. T. Harrison and H.
Osborne write that a red spectrum (range 700-900 nm) of the object,
obtained with the 2.1-m reflector at Kitt Peak on June 22, shows no
emission or absorption lines (and so is not a late-type star). A.
Price and E. O. Waagen, AAVSO, note that the available photometry
of the variable indicate that this is a WZ-Sge-type dwarf nova.
Additional magnitudes (CCD and unfiltered unless otherwise noted)
for the variable star, provided in part by Waagen and Price: June
17.523, 12.0 (Nakamura; 300-mm f/4 lens + Fuji digital camera);
17.562, 12.3 (Itagaki); 18.138, V = 12.1 (R. James, Las Cruces,
NM); 18.309, V = 11.8 (R. Royer, Springville, CA); 19.228, V = 12.3
(James); 20.315, 12.5 (M. Simonsen, Imlay City, MI; visual);
20.488, 12.8 (Itagaki); 21.189, 12.6 (Simonsen); 21.229, V = 12.6
(James); 21.960, 13.0 (G. Poyner, Birmingham, England; visual);
22.050, 13.1 (Poyner); 22.400, V = 12.8 (James); 22.48, 13.2
(Itagaki); 24.044, 13.2 (P. Schmeer, Bischmisheim, Germany; visual);
30.115, 14.3 (M. Mattei, Littleton, MA); 30.156, R = 14.1 (M.
Koppelman, Golden Valley, MN); 30.166, V = 14.6 (B. Gary, Hereford,
AZ).
(C) Copyright 2004 CBAT
2004 June 30 (8363) Daniel W. E. Green
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