Central Bureau for Astronomical Telegrams
IAUC 5267: 1991ab; 1991aa; Corrs
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Read IAUC 5268
Circular No. 5267
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
SUPERNOVA 1991ab IN ANONYMOUS GALAXY
C. Pollas, Observatoire de la Cote d'Azur, reports his discovery
of an apparent supernova (mag about 19.5) in a spiral galaxy of
mag about 16; SN 1991ab is located at R.A. = 13h56m59s.77, Decl. =
+19 55'38".2 (equinox 1950.0), which is 8".1 east and 11".0 north of
the galaxy's center. The object was found on Tech Pan films taken
by D. Albanese with the OCA Schmidt telescope on May 8.06 and 12.01
UT, the exposures having limiting magnitudes of about 22.5 and 22,
respectively. Nothing is visible on the Palomar Sky Survey blue and
red prints to mag about 21 and 20, respectively. A nearby star of
mag 16 is at R.A. = 13h57m11s.98, Decl. = +19 55'24".0.
SUPERNOVA 1991aa IN ANONYMOUS GALAXY
M. M. Phillips, Cerro Tololo Interamerican Observatory, reports:
"A spectrum of SN 1991aa obtained with the CTIO 1.5-m telescope
on May 13 UT suggests that this is a type-Ia supernova that
has been caught substantially before maximum (cf. IAUC 5263). The
spectrum bears a strong resemblance to that of SN 1990N obtained by
Leibundgut et al. (1991, Ap.J. 371, L23) 14 days before B maximum.
Narrow H-alpha emission at the position of the supernova yields a
redshift of 0.0110, which is essentially identical to the velocity
of the H-alpha emission observed in the nucleus of the parent
galaxy. Expansion velocities of 18 650, 13 000, and 14 000 km/s are
derived for the Ca II H and K, Mg II 448.1-nm, and Si II 635.5-nm
absorption features, respectively. A preliminary flux calibration
yields V = 15.0 and B-V = 0.0, confirming that the supernova has
increased in brightness since discovery."
CORRIGENDA
On IAUC 4975, 'BZ Ursae Majoris', line 8, for BZ Uma read
BZ UMa
On IAUC 4986, 'Markarian 421', line 2, for Laboraatory read
Laboratory
On IAUC 5219, '1991 FB', line 1, for Adeliade read Adelaide
On IAUC 5259, 'Supernova 1991T in NGC 4527', line 3, for
5255); May read 5255): May
On IAUC 5266, line 10, for Lawrence read Helin
1991 May 14 (5267) Daniel W. E. Green
Read IAUC 5268
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