Now showing items 11-20 of 176
The L X – T relation and intracluster gas fractions of X-ray clusters
(Blackwell Science Ltd, 1999-05-21)
We re-examine the X-ray luminosity–temperature relation using a nearly homogeneous data set of 24 clusters selected for statistically accurate temperature measurements and absence of strong cooling flows. The data exhibit ...
Three-dimensional dust radiative-transfer models: the Pinwheel Nebula of WR 104
(Blackwell Science Ltd, 2004-05)
We present radiative-transfer modelling of the dusty spiral Pinwheel Nebula observed around the Wolf–Rayet/OB-star binary WR 104. The models are based on the three-dimensional radiative-transfer code torus, modified to ...
Manganese and carbon lines as temperature indicators
(Kluwer Academic Publishers; D. Reidel Publishing Company ; Springer Science+Business Media, 1986-03)
Selected hyperfine structure broadened lines of various excitations and the carbon line at 5380 Å are tested as temperature diagnostics for photospheric heterogeneities. This is done by comparing the observed center-to-limb ...
On the completeness of the analysis of third and fourth spectra of the iron group, and the spectra of early B stars
(Elsevier, 1988-04-02)
The spectroscopic analysis of normal, early B stars requires a sound atomic data base, especially for the third and fourth spectra of the iron-group elements. We review the present status of the term analyses of third and ...
HR 710 (HD 15144): an ultra-Sr-rich, magnetic Ap star with a close companion ★
(Blackwell Publishing Ltd, 2008-03-11)
The magnetic, chemically peculiar A-star HR 710 (HD 15144, ADS 1849A, AB Cet) has a close companion in a nearly circular orbit. Its 3-d period is unusually short for such stars. The system emits moderately hard X-rays, ...
On the Sun's limb brightening in the visible
(Kluwer Academic Publishers; D. Reidel Publishing Company ; Springer Science+Business Media, 1984-06)
It is shown that in practice the method by Julius (1906) is incapable to determine the limb intensity drop. The brief intensity reversal near the extreme limb as derived from cinematography of flash spectra can be explained ...
A comparison of the temperature and emission measure of X-ray active regions with coronal magnetic fields
(Kluwer Academic Publishers; D. Reidel Publishing Company ; Springer Science+Business Media, 1979-08)
The distribution of temperature and of emission measure in X-ray active regions relative to the coronal magnetic fields has been investigated. The position of maximum temperature and the position of maximum emission measure ...
LETTER: The Life and Times of Extremal Black Holes
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 2000-11)
Charged extremal black holes cannot fully evaporate through the Hawking effect and are thus long lived. Over their lifetimes, these black holes take part in a variety of astrophysical processes, including many that lead ...
The effects of clumping and substructure on intracluster medium mass measurements
(Univ Chicago Press, 1999-07-20)
We examine an ensemble of 48 simulated clusters to determine the effects of small-scale density fluctuations and large-scale substructure on X-ray measurements of the intracluster medium (ICM) mass. We measure rms density ...
The imprint of massive black hole formation models on the LISA data stream
(Blackwell Publishing Ltd, 2007-06-01)
The formation, merging and accretion history of massive black holes (MBHs) along the hierarchical build-up of cosmic structures leaves a unique imprint on the background of gravitational waves (GWs) at mHz frequencies. We ...