[vsnet-alert 4355] very curious spectra of SN 2000H

[Hitoshi YAMAOKA <yamaoka@rc.kyushu-u.ac.jp>]

Dear SN watchers,

  IAUC 7375 informed us about the spectra of SN 2000H obtained by
ESO.  They (Benetti et al.) report that they are now dominated by He I
lines, and deep H-alpha absorption and tiny H-beta absorption.  They
conclude that it is similar to SN IIb 1993J in Messier 81, which is
thought to be the core-collapse of the star who posses the tiny
hydrogen-rich envelope.  

  The evolution of spectra of SN 2000H, however, is quite different
from SN 1993J, which was observed at near maximum as dominated H-alpha
P-Cyg (emission and blueward absorption) profile and later resembled 
to that of type Ib.  SN 2000H was dominated on the early phase by
absorption lines around 620 nm (which should be a blend of Si II and
H-alpha), 580 nm (Si II or Na I D), and 500 nm doublet (Fe II), which
was quite similar with that of SNe Ic, aside from the redward
steepness in 620 nm absorption.  The followup photometry of this
curious SN is quite important, and the observers reported the
magnitudes of this object should make the further cooperation
especially in the comparison sequence in order to make the
reports more reliable and valuable.

Sincerely Yours,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka@rc.kyushu-u.ac.jp

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