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Dear SN watchers, In [vsnet-campaign-sn 638] (June 14): > The first spectrum was taken on the same night at America, i.e. June >13.46 UT = 0.64 days after discovery. The IR spectrum shows a series >of strong and broad hydrogen Paschen emission lines, which indicates >that is it a type II SN around maximum. The explosion can occured >when it was behind the Sun. We are possibly able to enjoy the bright >SN for some weeks. Optical spectra taken by W. Herschel Telescope and Baade telecope on June 14 UT indicate that it is really a type II SN about 1-2 month after explosion. A better position of SN 2003gd is reported as R.A. = 1h36m42s.65, Decl. = +15o44'19".9 (J2000.0). The archived images taken by HST and Gemini North show the probable progenitor of SN 2003gd. Its magnitudes are: V=26.1 +/- 0.15, I ~ 23.8, which suggest that it is a red (spectral type M) supergiant (M_V = -3.5, log L/Lsun ~ 4). It seems to be a relatively low mass star (about 8-10 M_sun). Sincerely Yours, Hitoshi Yamaoka, Kyushu Univ., Japan yamaoka@rc.kyushu-u.ac.jp
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
