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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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20 papers · 2 filters
The Wind of the B[e] Supergiant Hen S22 Viewed through a Reflection Nebula in DEM L 106
Y. -H. Chu, C. -H. R. Chen, C. Danforth +5
Narrow-band HST WFPC2 images reveal a bow-shock-like halo around the HII region N30B toward the B[e] supergiant Hen S22 located within the larger DEM L 106 nebula in the Large Mage…
Formation of Binary Pulsars in Globular Clusters
Frederic A. Rasio
Close to 70 radio pulsars have now been discovered in 23 globular clusters, with a record 22 pulsars observed in 47 Tuc alone. Accurate timing solutions, including positions in the…
OH (1720 MHz) Masers and Mixed-Morphology Supernova Remnants
F. Yusef-Zadeh, M. Wardle, J. Rho +1
Radio surveys of supernova remnants (SNRs) in the Galaxy have uncovered 19 SNRs accompanied by OH maser emission at 1720 MHz. This unusual class of maser sources is suggested to be…
The Nature of 3EG J1746-2851 in the Nucleus of the Galaxy
F. Yusef-Zadeh
There are a number of candidate sources that are considered to be responsible for the origin of the EGRET source 3EG J1746--2851 (Hartman et al. 1999). The lack of clear identifica…
The Slow Merger of Massive Stars
Natalia Ivanova, Philipp Podsiadlowski
We study the complete merger of two massive stars inside a common envelope and the subsequent evolution of the merger product, a rapidly rotating massive supergiant. Three qualitat…
Dynamical Instabilities in Extrasolar Planetary Systems
Eric B. Ford, Frederic A. Rasio, Kenneth Yu
Instabilities and strong dynamical interactions between multiple giant planets have been proposed as a possible explanation for the surprising orbital properties of extrasolar plan…
The Role of Helium Stars in the Formation of Double Neutron Stars
N. Ivanova, K. Belczynski, V. Kalogera +2
We have calculated the evolution of 60 model binary systems consisting of helium stars in the mass range of M_He= 2.5-6Msun with a 1.4Msun neutron star companion to investigate the…
Origins of the Highly Ionized Gas along the Line of Sight towards HD 116852
Andrew J. Fox, Blair D. Savage, Kenneth R. Sembach +5
We present Hubble Space Telescope Imaging Spectrograph (HST/STIS) and Far Ultraviolet Spectroscopic Explorer (FUSE) observations of high ion interstellar absorption along the sight…
Thermal OH (1667/65 MHz) Absorption and Nonthermal OH (1720 MHz) Emission Towards the W28 Supernova Remnant
F. Yusef-Zadeh, M. Wardle, D. A. Roberts
The W28 supernova remnant is an excellent prototype for observing shocked gas resulting from the interaction of supernova remnants (SNRs) and adjacent molecular clouds (MCs). We pr…
The distribution of mass ratios in compact object binaries
T. Bulik, K. Belczynski, V. Kalogera
Using the StarTrack population synthesis code we compute the distribution of masses of merging compact object (black hole or neutron star) binaries. The shape of the mass distribut…
The Probability Distribution of Binary Pulsar Coalescence Rates. I. Double Neutron Star Systems in the Galactic Field
C. Kim, V. Kalogera, D. R. Lorimer
Estimates of the Galactic coalescence rate (R) of close binaries with two neutron stars (NS-NS) are known to be uncertain by large factors (about two orders of magnitude) mainly du…
Radio Galaxy Redshift-Angular Size Data Constraints on Dark Energy
Silviu Podariu, Ruth A. Daly, Matthew P. Mory +1
We use FRIIb radio galaxy redshift-angular size data to constrain cosmological parameters in a dark energy scalar field model. The derived constraints are consistent with but weake…
The Origin of Subdwarf B Star (I): the Formation Channels
Zhanwen Han, Philipp Podsiadlowski, Pierre L. F. Maxted +2
Subdwarf B (sdB) stars (and related sdO/sdOB stars) are believed to be helium core-burning objects with very thin hydrogen-rich envelopes. In recent years it has become increasingl…
Helium-Core White Dwarfs in Globular Clusters
Brad Hansen, Vassiliki Kalogera, Frederic A. Rasio
We examine the theoretical implications of a population of low-mass helium-core white dwarfs in globular clusters. In particular, we focus on the observed population in the core of…
Formation and Evolution of Microquasar GRS 1915+105
Krzysztof Belczynski, Tomasz Bulik
Using the StarTrack population synthesis code we analyze the possible formation channels of the Galactic microquasar GRS 1915+105 harboring the most massive known stellar black hol…
Merger Sites of Double Neutron Stars and their Host Galaxies
Krzysztof Belczynski, Tomasz Bulik, Vassiliki Kalogera
Using the StarTrack population synthesis code we analyze the formation channels possibly available to double neutron star binaries and find that they can be richer than previously…
Measuring Neutron Star Radii with Gravitational Wave Detectors
Joshua A. Faber, Philippe Grandclement, Frederic A. Rasio +1
Coalescing binary neutron stars (NS) are expected to be an important source of gravitational waves (GW) detectable by laser interferometers. We present here a simple method for det…
The effect of dissipative corona on the structure and stability of cold optically thick accretion disks at high accretion rates
Ranjeev Misra, R. E. Taam
The vertical structure of optically thick accretion disks is investigated in the two-zone approximation. The disk is divided into an underlying disk and a corona, where the latter…
The Origin of X-ray Emission from a Galactic Center Molecular Cloud: Low Energy Cosmic Ray Electrons
F. Yusef-Zadeh, C. Law, M. Wardle
The Galactic center region near l hosts a mixture of nonthermal linear filaments and thermal radio continuum features associated with the radio Arc. Chandra observati…
Short GRBs and Mergers of Compact Objects: Observational Constraints
Rosalba Perna, Krzysztof Belczynski
GRB data accumulated over the years have shown that the distribution of their time duration is bimodal. While there is some evidence that long bursts are associated with star-formi…