NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-23 T11:23:02 PDT
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For refcode 1999IAUC.7239C...1F:
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NED Abstract

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1999IAUC.7239C...1F Circular No. 7239 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION SUPERNOVAE 1999df, 1999di AND 1999dj A. V. Filippenko, T. Matheson, R. T. Chornock and A. L. Coil, University of California at Berkeley, report that uncalibrated CCD spectra (range 330-1000 nm) obtained on Aug. 17 UT with the Shane 3-m reflector at Lick Observatory reveal that SN 1999df (cf. IAUC 7228) is of type II. Broad H-alpha emission is easily visible in the noisy data. The approximate redshift is 0.038, based on narrow emission lines in the host galaxy. SN 1999di (cf. IAUC 7234) is of type Ib, probably within a few weeks past maximum, with prominent He I absorption lines at a velocity of 8100 km/s. The identity of relatively strong absorption at rest wavelength 630 nm is uncertain; it might be C II 658 nm, Si II 635 nm, or possibly even H-alpha 656 nm. If the absorption is due to H-alpha (at velocity 12 000 km/s), then the object would be of type IIb. The redshift is 0.016, again from narrow lines in the host. SN 1999dj (cf. IAUC 7234) is of type II, with well-developed P-Cyg profiles. The redshift is 0.015. 1999 August 17 (7239) Gareth V. Williams
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