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174 papers · 1 filter
Magnetic White Dwarf Stars in the Sloan Digital Sky Survey
S. O. Kepler, Ingrid Pelisoli, Stefan Jordan +10
To obtain a better statistics on the occurrence of magnetism among white dwarfs, we searched the spectra of the hydrogen atmosphere white dwarf stars (DAs) in the Data Release 7 of…
Unveiling a network of parallel filaments in the Infrared Dark Cloud G14.225-0.506
Gemma Busquet, Qizhou Zhang, Aina Palau +10
We present the results of combined NH3(1,1) and (2,2) line emission observed with the Very Large Array and the Effelsberg 100m telescope of the Infrared Dark Cloud G14.225-0.506. T…
Confronting dark energy models mimicking CDM epoch with observational constraints: future cosmological perturbations decay or future Rip?
Artyom V. Astashenok, Sergei D. Odintsov
We confront dark energy models which are currently similar to CDM theory with observational data which include the SNe data, matter density perturbations and baryon acoustic osc…
Bright radio emission from an ultraluminous stellar-mass microquasar in M31
Matthew J. Middleton, James C. A. Miller-Jones, Sera Markoff +34
A subset of ultraluminous X-ray sources (those with luminosities < 10^40 erg/s) are thought to be powered by the accretion of gas onto black holes with masses of ~5-20 M_solar, pro…
X-ray follow-ups of XSSJ12270-4859: a low-mass X-ray binary with gamma ray FERMI-LAT association
D. de Martino, T. Belloni, M. Falanga +10
XSSJ1227.0-4859 is a peculiar, hard X-ray source recently positionally associated to the Fermi-LAT source 1FGLJ1227.9-4852/2FGLJ1227.7-4853. Multi-wavelength observations have adde…
Bayesian analysis of ages, masses, and distances to cool stars with non-LTE spectroscopic parameters
Aldo Serenelli, Maria Bergemann, Gregory Ruchti +1
For studies of Galactic evolution, the accurate characterization of stars in terms of their evolutionary stage and population membership is of fundamental importance. A standard ap…