Central Bureau for Astronomical Telegrams
IAUC 6295: N Cas 1995; RX J1239.5+2108 = S 10932 Com
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Circular No. 6295
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)
NOVA CASSIOPEIAE 1995
R. Gonzalez-Riestra, IUE/Vilspa; S. N. Shore, Indiana University
at South Bend; S. Starrfield, Arizona State University; and J. Krautter,
Landessternwarte Heidelberg report: "Nova Cas 1995 has been monitored with
IUE since about one month after discovery. Integrated fluxes in the
120-200-nm range are (in units of 10**-11 erg cm**-2 s**-1): 1995 Sept.
22.1 UT, 2.90; Dec. 22.8, 1.30; 23.8, 1.80; 1996 Jan. 6.8, 9.61; 17.3, 15.2.
The initial spectrum showed a sloping continuum increasing toward
longer wavelengths characteristic of the fireball phase. The spectrum
obtained during the optical flare in Dec. 1995 (IAUC 6275, 6283) showed
a dramatic increase in the iron peak absorption shortward of 170 nm,
and windows in the continuum developed as the flux increased. The
reddening, as estimated from the strength of the 220-nm absorption
feature, is E(B-V) = 0.6. This value is consistent with an evolution at
constant bolometric luminosity. High-resolution (R = 10 000) spectra
obtained on Jan. 6 show a weak P-Cyg emission feature at Mg II 280 nm
with broad absorption extending to -500 km/s. The line profile is not
consistent with the presence of a wind and rather resembles the profiles
seen in the optically-thick stages of other novae. The mean radial velocity
for the interstellar component is -15 km/s. The N III] 175-nm and C III]
191-nm lines appeared in the Jan. 6 spectrum, characteristic of the
prenebular phase. No other unambiguous emission has been detected in the
short-wavelength spectra. The absorption spectrum is still very strong."
RX J1239.5+2108 = S 10932 COMAE BERENICES
G. A. Richter and P. Kroll, Sonneberg and Tautenburg Observatories;
and J. Greiner, Max Planck Institute for Extraterrestrial Physics, report:
"The recent reports via the VSNET exploder of an outburst of S 10932 Com,
a cataclysmic variable at R.A. = 12h39m32s.1, Decl. = +21d08'06''
(equinox 2000.0; Richter and Greiner 1995, in Cataclysmic Variables,
ed. A. Bianchini et al., ASSL 205, p. 177) motivated us to improve the
eclipse lightcurve (Wenzel et al. 1995, IBVS 4182). Using CCD photometry
with the Sonneberg 0.60-m Cassegrain telescope during 1994 May 11-1996
Jan. 4 and archival photographic eclipse observations since 1973,
we derive for the minimum the ephemeris HJD =
2449486.48166 + 0.0870386727E. The many observed eclipses are of
varying depth (1.5-4.4 mag in the R band). The maximum depth occurred
on 1996 Jan. 4-5, i.e., a few days after the recent outburst. This
outburst is the third after those in 1959 and 1988, implying a possible
cycle length of 8 years."
(C) Copyright 1996 CBAT
1996 January 26 (6295) Brian G. Marsden
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