[vsnet-alert 1642] SN 1998ab

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

Dear all,

  There is another SN in NGC galaxy. According to IAUC 6858, BAO SN
servey have discovered SN 1998ab in NGC 4704 which locates in CVn. The
position of SN is reported as: R.A. = 12h48m47s.24, Decl. =
+41o55'28".3 (2000.0), which is 2" east and 12" north from the core of
the host galaxy. However, the following observation and the image
taken at Ouda station shows that SN locates 7-8" more eastern. 
Its magnitudes are also reported; Apr. 1.67UT (at discovery), 16.1
(probably CCD without filter), 4.4UT, B=16.6, V=16.4. 

  Spectroscopy of SN 1998ab shows that this SN resembles to the
peculiar SN Ia 1991T before maximum. Si feature is weak, Fe and Ca
absorptions are dominant. Note that SN 1991T was 0.5-1 mag brighter
than usual(typical) SNeIa and investigated heavily. 

  NGC 4704 appears to be Sb galaxy almost faced-on. Estimated from its
recession velocity, this galaxy is farther than Coma cluster and 8
times backward of Virgo cluster. Typical SNeIa at this distance will
show about 16.5 mag at maximum, but it would be expected to become
more brighter. (Of course, the distance estimate would possibly be
wrong.) Further photometric observations are doubtlessly urged.

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

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