Supernova 1997de in NGC 6769
Abstract
Alexander Wassilieff, Palmerston North, New Zealand, reports his discovery, on two CCD images taken with a 0.36-m f/4 reflector (+ SBIG ST-7 camera) on Aug. 27, of an apparent supernova (mag about 18.2) located 14".5 west and 20".6 north of the center of NGC 6769 (R.A. = 19h18m.4, Decl. = -60o31', equinox 2000.0). The star does not appear on a similar image taken on 1994 July 9, nor does it appear on the Digital Sky Survey. B. Schmidt, Mount Stromlo and Siding Spring Observatories, reports via R. Evans that Brendan Downs (at Camp Duckadang, Queensland) independently found SN 1997de with a 0.31-m telescope (+ CCD) on Aug. 27.7, the offset noted as 16" west and 22" north of the center of NGC 6769. N. Suntzeff, Cerro Tololo Interamerican Observatory (CTIO), reports that spectrophotometry (range 320-900 nm; resolution 900) was obtained by J. Maza on Aug. 28.0 UT with the CTIO 4-m telescope. M. Phillips and Suntzeff find the spectrum of SN 1997de to be that of a type-Ia event, about 4 weeks after maximum. There is significant Na I absorption (0.23 nm) at 3900 km/s (at the redshift of the host galaxy).
- Publication:
-
International Astronomical Union Circular
- Pub Date:
- August 1997
- Bibcode:
- 1997IAUC.6725....1W