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135 papers · 1 filter
A New Measurement of the X-ray Temperature Function of Clusters of Galaxies
Yasushi Ikebe, Thomas H. Reiprich, Hans Boehringer +2
We present a newly measured X-ray temperature function of galaxy clusters using a complete flux-limited sample of 61 clusters. The sample is constructed with the total survey area…
Abundances of Deuterium, Oxygen, and Nitrogen in the Local Interstellar Medium: Overview of First Results from the Far Ultraviolet Spectroscopic Explorer Mission
H. W. Moos, K. R. Sembach, A. Vidal-Madjar +33
Observations obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) have been used to determine the column densities of D I, O I, and N I along seven sight lines that prob…
Chromospherically young, kinematically old stars
H. J. Rocha-Pinto, B. V. Castilho, W. J. Maciel
We have investigated a group of stars known to have low chromospheric ages, but high kinematical ages. Isochrone, chemical and lithium ages are estimated for them. The majority of…
The primordial Helium-4 abundance determination: systematic effects
T. X. Thuan, Y. I. Izotov
By extrapolating to O/H = N/H = 0 the empirical correlations Y-O/H and Y-N/H defined by a relatively large sample of ~ 45 Blue Compact Dwarfs (BCDs), we have obtained a primordial…
Deep HST-WFPC2 photometry of NGC 288. I. Binary Systems and Blue Stragglers
M. Bellazzini, F. Fusi Pecci, M. Messineo +2
We present the first results of a deep WFPC2 photometric survey of the loose galactic globular cluster NGC 288. The fraction of binary systems is estimated from the color distribut…
The KPNO International Spectroscopic Survey. III. [O III]-selected Survey List
John J. Salzer, Caryl Gronwall, Vicki L. Sarajedini +8
The KPNO International Spectroscopic Survey (KISS) is an objective-prism survey for extragalactic emission-line objects. It combines many of the features of previous slitless spect…