Central Bureau for Astronomical Telegrams
IAUC 7324: V1494 Aql = N Aql 1999 No. 2; AX J1841.0-0535.8
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Circular No. 7324
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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V1494 AQUILAE = NOVA AQUILAE 1999 No. 2
M. Fujii, Kurashiki, Okayama, Japan, reports that
spectroscopic observations (0.28-m reflector; resolution about 1
nm; instrumental resolution about 450 km/s) on Dec. 2.39 UT show
H-alpha and H-beta with P-Cyg profiles; H-alpha emission has a
width of 1200 km/s (FWHM). The spectrum is posted at
http://www1.harenet.ne.jp/~aikow/nova_aql2.gif.
K. Ayani, Bisei Astronomical Observatory (BAO), writes: "I
obtained low-dispersion spectra (range 400-900 nm; resolution 0.54
nm at H-alpha) of this nova on Dec. 2.4 UT with the BAO 1.01-m
telescope (+ CCD spectrograph). Emission lines of the Balmer
series, Mg II 448.1-nm (or He I 447.1-nm), and O I 777.4-nm are
detected, all with P-Cyg profiles. Weak lines of Fe II 492.4- and
501.8-nm may also have P-Cyg profiles but are dominated by
blueshifted absorption. By decomposing the H-alpha profile into a
blueshifted Gaussian absorption and a Gaussian emission profile, it
is determined that the FWHM and equivalent width of the emission
component are about 1700 km/s and 2.6 nm, respectively, and the
blueshift of the absorption component with respect to the emission
is about 1020 km/s."
W. Liller, Vina del Mar, Chile, reports that V1494 Aql was
fainter than mag 10.5 (not visible) on an image obtained on Nov.
25.035 UT. Photometry by B. Skiff, Lowell Observatory (0.53-m
reflector): Dec. 2.07, V = 5.03, b-y (Stromgren) = +0.40
(comparison star HD 188728). Additional visual magnitude
estimates: Dec. 1.954, 5.5 (M. Mattei, Littleton, MA); 1.956, 5.6
(R. W. Sinnott, Chelmsford, MA); 1.96, 5.4 (G. Seronik, Belmont,
MA); 2.685, 4.2 (R. J. Bouma, Groningen, The Netherlands); 2.70,
4.3 (H. Mikuz, Ljubljana, Slovenia); 2.722, 4.4 (S. Foglia, Milan,
Italy); 2.732, 4.2 (K. Hornoch, Lelekovice, Czech Republic); 2.748,
4.2 (S. Baroni, Milan, Italy); 2.778, 4.0 (Baroni); 2.785, 3.9
(Baroni); 2.788, 3.7 (Baroni).
AX J1841.0-0535.8
A. Bamba and K. Koyama, Kyoto University, report: "ASCA found
an x-ray outburst in the Galactic plane on 1999 Oct. 4.2 UT, at
R.A. = 18h41m02s, Decl. = -5 35'.8 (equinox 2000.0; +/- 20" at
90-percent confidence). The outburst was unusual, with a rise time
of < 1000 s. The mean flux during the outburst was 10**-10 erg
cm**-2 s**-1 and highly variable. The spectrum was hard and
heavily absorbed, typical of x-ray-binary pulsars in the Scutum
arm, but we found no coherent pulsation. AX J1841.0-0535.8
coincides in position with one of the Ginga transients (Koyama et
al. 1990, Nature 343, 148). We encourage follow-up observations of
this source."
(C) Copyright 1999 CBAT
1999 December 2 (7324) Daniel W. E. Green
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