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8 papers · 1 filter
Measurements of Omega and Lambda from 42 High-Redshift Supernovae
S. Perlmutter, G. Aldering, G. Goldhaber +29
We report measurements of the mass density, Omega_M, and cosmological-constant energy density, Omega_Lambda, of the universe based on the analysis of 42 Type Ia supernovae discover…
The rapid evolution of the born-again giant Sakurai's object
M. Asplund, D. L. Lambert, T. Kipper +2
The extraordinarily rapid evolution of the born-again giant Sakurai's object can be traced both in a continued cooling of the stellar surface and dramatic changes in chemical compo…
56Ni dredge-up in the type IIp Supernova 1995V
A. Fassia, W. P. S. Meikle, T. R. Geballe +4
We present contemporary infrared and optical spectra of the plateau type II SN 1995V in NGC 1087 covering four epochs, approximately 22 to 84 days after shock breakout. The data sh…
Evidence for a 20pc disk at the nucleus of Centaurus A
Ethan Schreier, Alessandro Marconi, David Axon +6
We report HST NICMOS observations of the central region of NGC 5128 at 2.2mic and in Paschen Alpha (PA). The continuum images show extended emission typical of an elliptical galaxy…
HST spatially-resolved spectra of the accretion disc and gas stream of the nova-like variable UX Ursae Majoris
R. Baptista, K. Horne, R. A. Wade +3
Time-resolved eclipse spectroscopy of the nova-like variable UX UMa obtained with the HST/FOS on 1994 August and November is analyzed with eclipse mapping techniques to produce spa…
Spectroscopy of Globular Clusters in NGC 4472
R. M. Sharples, S. E. Zepf, T. J. Bridges +4
Optical multi-slit spectra have been obtained for 47 globular clusters surrounding the brightest Virgo elliptical NGC 4472 (M49). Including data from the literature, we analyze vel…