NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-20 T06:43:28 PDT
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For refcode 2008CBET.1275A...1S:
Retrieve 12 NED objects in this reference.
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NED Abstract

Copyright by Central Bureau for Astronomical Telegrams. 2008CBET.1275A...1S Electronic Telegram No. 1275 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION SUPERNOVAE 2007gw, 2008S, 2008T, 2008al, 2008ao, AND 2008ap T. N. Steele, J. M. Silverman, M. Ganeshalingam, N. Lee, W. Li, and A. V. Filippenko, University of California, Berkeley, report that inspection of CCD spectra (range 440-980 nm), obtained on Feb. 29 UT with the 3-m Shane reflector (+ Kast) at Lick Observatory, shows that 2007gw (CBET 1042) is a type-II supernova, probably 100-200 days after explosion. Removing a recession velocity of 4970 km/s (from narrow emission lines), the minimum of the H-alpha absorption is blueshifted by about 6100 km/s. SN 2008T (CBET 1237) is also a type-II supernova. Removing a recession velocity of 5400 km/s (from narrow emission lines), the minimum of the H-alpha absorption is blueshifted by about 5200 km/s. SN 2008al (CBET 1261) is also of type-II, with H-alpha emission (FWHM about 9850 km/s) greatly dominating the almost non-existent absorption. The spectrum is similar to those of some type-IIL supernovae. SN 2008ao (CBET 1269) is a type-Ic supernova within one week past maximum light, consistent with the classification by Blondin et al. (CBET 1274). SN 2008ap (CBET 1270) is a type-II supernova. Removing a recession velocity of 8262 km/s (de Vaucouleurs et al. 1991, Third Reference Catalogue of Bright Galaxies), the minimum of the H-alpha absorption is blueshifted by about 7750 km/s. The spectrum of the type-IIn supernova 2008S (CBETs 1234, 1235, 1236) is quite peculiar. In addition to the narrow (FWHM about 900 km/s) Balmer emission lines, there are strong, comparably narrow emission lines of the [Ca II] 730-nm doublet and the Ca II near-infrared triplet, as well as many weak emission lines of Fe II and other species. Given these spectral properties, and an absolute visual magnitude of about -13 (corrected for Galactic extinction of 1 mag), the object is likely to be a "supernova impostor" such as 1997bs (Van Dyk et al. 2000, PASP 112, 1532). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2008 CBAT 2008 February 29 (CBET 1275) Daniel W. E. Green
Retrieve 12 NED objects in this reference.
Please click here for ADS abstract

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