Central Bureau for Astronomical Telegrams
IAUC 7748: 2001fh; 2001fu; SS 433
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Circular No. 7748
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2001fh IN PGC 66592
S. Benetti, G. Altavilla, E. Cappellaro, A. Pastorello, M.
Turatto, S. Desidera, and E. Giro, Osservatorio Astronomico di
Padova, write: "A noisy CCD spectrum (range 380-770 nm, resolution
2.5 nm) of SN 2001fh (cf. IAUC 7744), obtained on Nov. 6.97 UT with
the Asiago 1.82-m telescope (+ AFOSC) under poor atmospheric
conditions, is similar to that of the peculiar type-Ia SN 1986G few
days before maximum (Cristiani et al. 1992, A.Ap. 259, 63). The
spectrum shows a relatively red continuum, suggesting significant
reddening. This is consistent with the detection of a strong
absorption at 597.0 nm (equivalent width, EW, about 0.35 nm)
attributed to interstellar Na I D absorption in the host galaxy
(V_rec = 3920 km/s from the LEDA Extragalactic Database). The
strongest feature of the spectrum is the Si II 635.5-nm absorption
measured at about 621.3 nm, from which an expansion velocity of
about 10500 km/s is deduced."
T. Matheson, S. Jha, P. Challis, and R. Kirshner, Center for
Astrophysics, report: "A spectrum (range 370-750 nm) of SN 2001fh,
obtained by P. Berlind on Nov. 7.19 UT with the Mt. Hopkins 1.5-m
telescope (+ FAST spectrograph), shows it to be a type-Ia supernova
near maximum. Adopting the NASA/IPAC Extragalactic Database
recession velocity of 3894 km/s for the host galaxy, the supernova
expansion velocity is about 11 000 km/s for Si II (rest 635.5 nm).
The spectral-feature age of the supernova (Riess et al. 1997, A.J.
114, 722) is 1 +/- 2 days before maximum light. The spectrum shows
strong narrow Na I D absorptions at zero velocity (0.09-nm EW) and
at the velocity of the host galaxy (0.16-nm EW). The Schlegel et
al. (1998, Ap.J. 500, 525) dust maps indicate a Galactic reddening
of E(B-V) = 0.76. In addition, the overall shape of the spectrum
declines toward the blue, implying that the supernova is heavily
extinguished by dust."
SUPERNOVA 2001fu IN MCG -03-23-11
Matheson et al. also report that a spectrum (range 370-750 nm)
of SN 2001fu (cf. IAUC 7746), obtained by Berlind as above on Nov.
7.51 UT, shows it to be a type-Ia supernova a few weeks past
maximum. Cross-correlation of a spectrum of the host galaxy
nucleus with absorption-line velocity templates indicates a
recession velocity of 1730 +/- 30 km/s.
SS 433
Corrigendum. On IAUC 7747, line 3, FOR 0.5 mJy READ
5 mJy; on line 4, FOR 0.05 mK READ 5 mK
(C) Copyright 2001 CBAT
2001 November 7 (7748) Daniel W. E. Green
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