Central Bureau for Astronomical Telegrams
IAUC 6151: CH Cyg; V1413 Aql
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Circular No. 6151
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)
CH CYGNI
C. Rossi, Istituto Astronomico, La Sapienza University, Rome;
G. Muratorio, Observatoire de Marseille; and R. Viotti, Istituto
Astrofisica Spaziale, CNR, Frascati; communicate: "Preliminary
analysis of optical spectrograms (0.02 nm/pixel at 405-533 nm and
0.004 nm/pixel at 652-659 nm), obtained using the AURELIE system of
the Observatoire de Haute Provence 1.52-m telescope during Jan.
11.2-16.2 UT, indicates that the high-velocity event reported by
Iijima (IAUC 6146) was already present in January. The Balmer
lines display prominent, double-peaked emissions (red peak stronger
than the blue) and broad, blueshifted P-Cyg absorptions located
-450 to -500 km/s from the central dip. The P-Cyg profile appears
strongly variable on short timescales (down to 0.4 day). Dramatic
variation has been observed in H-beta. On Jan. 14.8, the line
displayed a strong absorption component at -1050 km/s, extending
from about -900 to -1400 km/s (all velocities are referred to the
central absorption); by Jan. 15.8, this line was no longer visible,
and another, deep, broad absorption was visible at -540 km/s,
extending to -800 km/s, with a shallow emission centered at about
-1400 km/s and extending to -2000 km/s. The He I 447-nm line also
displayed a broad emission with variable absorption. On Jan. 16.2,
the H-alpha line was characterized by a double-peaked emission with
a blue shoulder from -100 to -400 km/s. A shallow P-Cyg absorption
extending to < -1000 km/s may also be present, largely masked by
the M star's spectrum. No variation was noted in the low-excitation
emission spectrum."
V1413 AQUILAE
U. Munari, T. Tomov, and B. Yudin, Asiago Astrophysical
Observatory; and G. Sostero and R. Passuello, Associazione Friulana di
Astronomia e Meteorologia, write: "The eclipsing symbiotic nova AS
338 = V1413 Aql entered the still-ongoing ouburst in 1981 (cf.
Munari 1992, A.Ap. 257, 163) and it is currently experiencing a new
bright maximum after the last one occurred in late 1993 (cf. IAUC
5884). CCD optical spectra secured in March 1995 with the Asiago
Observatory 1.82-m and 1.22-m telescopes are dominated by a blue
continuum, with only weak Fe II, He I, and hydrogen Balmer lines in
emission. Hydrogen lines show the usual double-peaked profile.
There is no spectroscopic signature of mass loss from the outbursting
component. Photoelectric photometry obtained on Mar. 12.15 UT
with the AFAM 0.45-m telescope gives V = 11.3, B-V = +0.9, U-B = -0.6."
1995 March 20 (6151) Daniel W. E. Green
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