1k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Goddard Space Flight CenterUS21 papers
- Centre National de la Recherche ScientifiqueFR18 papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR18 papers
- Astrophysique, Instrumentation et ModélisationFR17 papers
- Max Planck Institute for Radio AstronomyDE17 papers
- Universities Space Research AssociationUS17 papers
- National Institute for AstrophysicsIT16 papers
- University of Maryland, College ParkUS16 papers
- University of PaduaIT16 papers
- University of Rome Tor VergataIT16 papers
- CEA Paris-SaclayFR15 papers
- Friedrich-Alexander-Universität Erlangen-NürnbergDE15 papers
18 papers · 1 filter
MOJAVE: Monitoring of Jets in AGN with VLBA Experiments. V. Multi-epoch VLBA Images
M. L. Lister, H. D. Aller, M. F. Aller +9
We present images from a long term program (MOJAVE: Monitoring of Jets in AGN with VLBA Experiments) to survey the structure and evolution of parsec-scale jet phenomena associated…
HVS7: a chemically peculiar hyper-velocity star
N. Przybilla, M. F. Nieva, A. Tillich +3
Context: Hyper-velocity stars are suggested to originate from the dynamical interaction of binary stars with the supermassive black hole in the Galactic centre (GC), which accelera…
The Araucaria Project: the Local Group Galaxy WLM--Distance and metallicity from quantitative spectroscopy of blue Supergiants
M. A. Urbaneja, R. -P. Kudritzki, F. Bresolin +3
The quantitative analysis of low resolution spectra of A and B supergiants is used to determine a distance modulus of 24.99 +/- 0.10 mag (995 +/- 46 Kpc) to the Local Group galaxy…
Quantitative Spectroscopy of 24 A supergiants in the Sculptor galaxy NGC 300: Flux weighted gravity luminosity relationship, metallicity and metallicity gradient
R. -P. Kudritzki, M. A. Urbaneja, F. Bresolin +3
A quantitative spectral analysis of 24 A supergiants in the Sculptor Group spiral galaxy NGC 300 at a distance of 1.9 Mpc is presented. A new method is introduced to analyze low re…
LMC origin of the hyper-velocity star HE 0437-5439. Beyond the supermassive black hole paradigm
N. Przybilla, M. F. Nieva, U. Heber +4
Context: Hyper-velocity stars move so fast that only a supermassive black hole (SMBH) seems to be capable to accelerate them. Hence the Galactic centre (GC) is their only suggested…
Detection of diffuse interstellar bands in M31
M. A. Cordiner, N. L. J. Cox, C. Trundle +5
We investigate the diffuse interstellar band (DIB) spectrum in the interstellar medium of M31. The DEIMOS spectrograph of the W. M. Keck observatory was used to make optical spectr…
A model for cyclotron resonance scattering features
G. Schönherr, J. Wilms, P. Kretschmar +5
(abbreviated version of the abstract) We study the physics of cyclotron line formation in the high-energy spectra of accreting X-ray pulsars using Monte Carlo methods, assuming tha…
Time resolved spectroscopy of the multiperiodic pulsating subdwarf B star PG1605+072
A. Tillich, U. Heber, S. J. O'Toole
We present results for the 2m spectroscopic part of the MultiSite Spectroscopic Telescope campaign, which took place in May/June 2002. In order to perform an asteroseismological an…
A non-LTE study of neutral and singly-ionized calcium in late-type stars
L. Mashonkina, A. J. Korn, N. Przybilla
Non-local thermodynamical equilibrium (NLTE) line formation for neutral and singly-ionized calcium is considered through a range of spectral types when the Ca abundance varies from…
C II abundances in early-type stars: solution to a notorious non-LTE problem
M. F. Nieva, N. Przybilla
We address a long-standing discrepancy between non-LTE analyses of the prominent C II 4267 and 6578/82 A multiplets in early-type stars. A comprehensive non-LTE model atom of C II…
Extreme helium stars: non-LTE matters Helium and hydrogen spectra of the unique objects V652 Her and HD144941
N. Przybilla, K. Butler, U. Heber +1
Quantitative analyses of low-mass hydrogen-deficient (super-)giant stars - so-called extreme helium stars - to date face two major difficulties. First, theory fails to reproduce th…
The mass of the sdB primary of the binary HS 2333+3927
U. Heber, H. Drechsel, C. Karl +8
Short period sdB binaries with cool companions are crucial to understand pre-CV evolution, because they will evolve into cataclysmic variables, when the sdB will have left the exte…
A Supergiants
N. Przybilla, F. Bresolin, K. Butler +3
A-type supergiants are primary targets for quantitative spectroscopy of individual stars in nearby galaxies because of their intrinsic brightness. An overview is given on the non-L…
The solar hydrogen spectrum in non-LTE
Norbert Przybilla, Keith Butler
We investigate the synthesis of the Balmer and Paschen lines of the quiet Sun, using both classical semi-empirical and theoretical model atmospheres, modern line broadening theory…
HST/STIS observations of sdBV stars: testing diffusion and pulsation theory
S. J. O'Toole, U. Heber, P. Chayer +3
We present the initial results of an abundance analysis of echelle UV spectra of 5 hot subdwarf B (sdB) stars. These stars have been identified as core helium burning objects on th…
Three-dimensional photoionisation modelling of the hydrogen-deficient knots in the planetary nebula Abell 30
B. Ercolano, M. J. Barlow, P. J. Storey +3
We have constructed a photoionization model, using the 3-D Monte Carlo code MOCASSIN for one of the hydrogen-deficient knots (J3) of the born-again planetary nebula Abell 30. The m…
Tomographic Separation of Composite Spectra. X. The Massive Close Binary HD 101131
D. R. Gies, L. R. Penny, P. Mayer +2
We present the first orbital elements for the massive close binary, HD 101131, one of the brightest objects in the young, open cluster, IC 2944. This system is a double-lined spect…
HS 0705+6700: a new eclipsing sdB binary
H. Drechsel, U. Heber, R. Napiwotzki +6
We report the discovery of an eclipsing binary - HS 0705+6700 - being an sdB star with a faint companion. From its light curve the orbital period of 8263.87 s, the mass ratio of th…