NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
The Type Ia supernova 1989B in NGC 3627 (M66)We report extensive optical photometry and spectroscopy of the Type Ia supernova 1989B. Maximum light in B occurred approximately seven days after discovery on JD 2447565.3 +/- 1.0 (1989 February 7.8 +/- 1.0) at a magnitude of 12.34 +/- 0.05. The UBV light curves of this supernova were very similar to those of other well observed Type Ia events such as SN 1981B and SN 1980N. From a comparison of the UBVRIJHK photometry, we derive an extinction for SN 1989B of E(B-V) = 0.37 +/- 0.03 mags relative to the unobscured Type Ia SN 1980N. The properties of the dust responsible for the reddening of SN 1989B appear to have been similar to those of normal dust in the Milky Way. In particular, we find no evidence for an unusually low value of the ratio of the total to selective absorption. We derive a distance modulus of delta mu(sub 0) = -1.62 +/- 0.03 mag relative to the Type Ia SN 1980N. We present optical spectra which provide essentially continuous coverage of the spectral evolution of SN 1989B over the first month following B maximum. These data show the transition from the maximum-light spectrum, in which lines of elements such as Ca, Si, S, Mg, and O are most prominent, to the Fe-dominated spectrum observed a few weeks after maximum. This transition occurred quite smoothly over a two-week period following B maximum. Comparison of the spectra of SN 1989B with data for two other well observed Type Ia supernovae -- 1981B and 1986G -- reveals subtle differences in the relative strengths of the S II and Si II absorption lines at maximum light. However, these differences disappeared within a week or so after maximum with the onset of the Fe-dominated phase.
Document ID
19950043832
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Wells, Lisa A.
(Cerro Tololo Inter-American Observatory La Serena, Chile)
Phillips, M. M.
(Cerro Tololo Inter-American Observatory La Serena, Chile)
Suntzeff, Nicholas B.
(Cerro Tololo Inter-American Observatory La Serena, Chile)
Heathcote, S. R.
(Cerro Tololo Inter-American Observatory La Serena, Chile)
Hamuy, Mario
(Cerro Tololo Inter-American Observatory La Serena, Chile)
Navarrete, M.
(Cerro Tololo Inter-American Observatory La Serena, Chile)
Fernandez, M.
(Cerro Tololo Inter-American Observatory La Serena, Chile)
Weller, W. G.
(Cerro Tololo Inter-American Observatory La Serena, Chile)
Schommer, R. A.
(Cerro Tololo Inter-American Observatory La Serena, Chile)
Kirshner, Robert P.
(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA United States)
Date Acquired
August 16, 2013
Publication Date
December 1, 1994
Publication Information
Publication: Astronomical Journal
Volume: 108
Issue: 6
ISSN: 0004-6256
Subject Category
Astronomy
Accession Number
95A75431
Funding Number(s)
CONTRACT_GRANT: NSF AST-91-15174
CONTRACT_GRANT: NSF AST-92-18035
CONTRACT_GRANT: NSF AST-92-18475
CONTRACT_GRANT: NSF AST-89-57063
CONTRACT_GRANT: NAGW-2905
CONTRACT_GRANT: NSF AST-88-09616
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available