IAU Central Bureau for Astronomical Telegrams

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IAUC 8496: 2005at, 2005au; CATACLYSMIC Var IN Pyx = Poss. N IN Pyx

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IAUC number

                                                  Circular No. 8496
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

SUPERNOVAE 2005at AND 2005au
     Further to IAUC 8490, R. Martin reports the discovery of an
apparent supernova (mag 16.0) on CCD images taken on Mar. 15.83 and
16.67 UT.  The new object is located at R.A. = 19h09m53s.62, Decl.
= -63o49'24".1 (equinox 2000.0).  Nothing was visible at this
location in an image from 2004 Aug. 8.75 (limiting mag 18.5).  H.
Yamaoka, Kyushu University, adds that there is a foreground star
(mag about 18) located about 5" south of Martin's position.  L. A.
G. Monard, Pretoria, S. Africa, reports his independent discovery
of SN 2005at on CCD images taken on Mar. 5.139 (at mag 14.3) and
19.133 (mag 14.4), providing position end figures 53s.57, 22".8 (or
46" east and 117" north of the center of NGC 6744).  Monard adds
that nothing is visible at this location on his image from 2004
Feb. 15.1 (limiting red mag 17.3) or on an image from the Digitized
Sky Survey (limiting red mag 20).
     B. Schmidt and M. Salvo, Australian National University (ANU),
report that a spectrogram (range 320-1050 nm) of SN 2005at,
obtained on Mar. 19.77 UT with the ANU 2.3-m telescope (+ DBS),
reveals it to be a type-Ic supernova resembling SN 1994I at
approximately 2 weeks past maximum light.  The relatively red
spectrum is dominated by broad P-Cyg profiles of the Ca II infrared
triplet, Na D line, and what appears to be He I 1083-nm.
     R. Arbour, South Wonston, U.K., reports his discovery of an
apparent supernova (mag approximately 15.8) on unfiltered CCD
images taken with a 0.3-m reflector on Mar. 19.955 and 20.817 UT in
the course of his supernova patrol.  SN 2005au is located at R.A. =
13h16m12s.42, Decl. = +30o56'40".5 (equinox 2000.0), which is 1"
east and 21" south of the center of NGC 5056.  Nothing is visible
at this location on Digitized Sky Survey images from 1989 (limiting
red mag 20.9) and 1995 (limiting blue mag 20.8).  Arbour adds that
images taken by D. Briggs (Clanfield, U.K., 0.60-m reflector) on
Mar. 20.891 yield position end figures 12s.38, 42".3 for SN 2005au.

     T. Kawabata, Y. Kawabata, and K. Ayani, Bisei Astronomical
Observatory (BAO); and H. Yamaoka, Kyushu University, obtained a
low-dispersion (resolution 1000) spectrogram of the eruptive
variable in Pyxis (cf. IAUC 8495) with the BAO 1.01-m telescope on
Mar. 18.61 UT.  The spectrum shows a blue continuum with wide
absorption of H_beta and H_gamma.  The H_alpha feature is not clear,
probably because the emission fills up the absorption.  Other
features are not clearly seen.  This suggests that the object is
not a classical nova, but rather a dwarf nova in outburst.

                      (C) Copyright 2005 CBAT
2005 March 22                  (8496)            Daniel W. E. Green

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