Central Bureau for Astronomical Telegrams
IAUC 6135: 1995D; N Aql 1995; 1994Y
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Circular No. 6135
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)
SUPERNOVA 1995D IN NGC 2962
S. Benetti, C. Mendes de Oliveira, European Southern Observatory
(ESO); and A. Manchado, Instituto de Astrofisica de Canarias,
report that inspection of a fully-reduced CCD spectrogram (range
350-100 nm, resolution 1 nm) obtained on Feb. 13.18 UT with ESO
1.5-m telescope (+ Boller & Chivens spectrograph), confirms that SN
1995D is a type-Ia supernova, about 1 week before maximum light.
The spectrum is dominated by P-Cyg lines of intermediate-mass
elements superimposed on a very blue continuum. Visible lines
include Ca II (H and K; infrared triplet); Si II (635.5 nm), S II
(546.8, 561.2, 565.4 nm) and faint O I (777.3 nm). Strong lines of
Si III (456.0, 574.0 nm) are also present, as in spectra of similar
phase of SN 1990N. Si II (597.2 nm) is unusual weak, if present at
all. The expansion velocities deduced from the minimum of Si II
635.5-nm and Ca II H and K lines, corrected by the redshift
(0.00655) of the parent galaxy, are about 10900 and 18200 km/s,
respectively.
NOVA AQUILAE 1995
T. Iijima, H. Esenoglu, and L. Rosino, Asiago Astrophysical
Observatory, report: "Optical spectrograms of N Aql 1995 were
obtained on Feb. 10.2 UT with the Asiago 1.2-m telescope (+ prismatic
spectrograph; range 410-510 nm, resolution 0.2 nm/pixel at 450 nm).
The spectra show prominent emissions lines of H I, Fe II (multiplet
24,28,32,37,38,42), and some weak lines of [Fe II] and [Fe III].
The FWHMs of H I lines are about 1300 km/s, while those of Fe II
are 1400 km/s, and none has a P-Cyg profile. These features
indicate that this nova is in the early decline stage."
Visual magnitude estimates: Feb. 12.436 UT, 9.0 (J. Bortle,
Stormville, NY); 13.445, 9.4 (Bortle); 14.18, 9.0 (L. Kiss, Szeged,
Hungary).
SUPERNOVA 1994Y IN NGC 5371
L. Wang, Z.-W. Li, A. Clocchiatti, and J. C. Wheeler, McDonald
Observatory, communicate: "A high-resolution (0.07 nm/pixel)
spectrogram of SN 1994Y taken at the McDonald 2.1-m telescope on
Feb. 8 shows a narrow absorption feature (full width about 365
km/s) at 662.2 nm, superimposed on top of the strong H-alpha line.
This signifies a significant amount of circumstellar material.
Observations at all wavelengths are encouraged."
1995 February 15 (6135) Daniel W. E. Green
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