SN2009ip: Further Low Resolution Optical and NIR Spectroscopic follow up

ATel #4477; T. C. Bohlsen (AAVSO)
on 12 Oct 2012; 01:03 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: John Martin (jmart5@uis.edu)

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I obtained an optical spectra (3900-8000A) with a resolution R=700 using a LISA spectrograph on a Celestron C11 telescope (250mm diameter f/6.4) from Armidale NSW Australia on UT 9.468 October 2012. The spectrum has prominent H Balmer emission with a FWHM of 550km/sec. The H-alpha line is redshifted slightly and measures 6599.0A. This is a shift of 36.2A equaling z = 0.0055. There is also a similar width He I emission at 5875A with the same redshift. Simultaneous photometry gave a magnitude of V = 13.80 B-V = 0.10. The spectra is very similar to that taken on 26th September 2012 reported in ATel #4435 (J. VinkAA et al). The P Cygni like features that were present in the 26th August spectra reported by J. VinkAA et al are no longer visible in my spectrum. This spectra supports the findings from J. VinkAA et al (ATel #4435) and Smith & Mauerhan (Atel#4427) that SN2009ip is an early type IIn SN. Images and the spectra files can be found at http://users.northnet.com.au/~bohlsen/Nova/sn2009ip.htm Follow up observations are continuing.