498 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Universidade de São PauloBR32 papers
- Laboratório Nacional de AstrofísicaBR20 papers
- Centre National de la Recherche ScientifiqueFR16 papers
- Cerro Tololo Inter-American ObservatoryCL15 papers
- Consejo Nacional de Investigaciones Científicas y TécnicasAR13 papers
- Carnegie Institution for ScienceUS11 papers
- Carnegie ObservatoriesUS11 papers
- California Institute of TechnologyUS10 papers
- Las Campanas ObservatoryCL10 papers
- Universidade Federal do Rio Grande do SulBR10 papers
- Universidad Nacional de La PlataAR10 papers
- University of ChileCL10 papers
18 papers · 1 filter
Orion's Bar: Physical Conditions across the Definitive H+ / H0 / H2 Interface
E. W. Pellegrini, J. A. Baldwin, G. J. Ferland +2
Previous work has shown the Orion Bar to be an interface between ionized and molecular gas, viewed roughly edge on, which is excited by the light from the Trapezium cluster. Much o…
Electron temperature fluctuations in NGC 346
V. A. Oliveira, M. V. F. Copetti, A. C. Krabbe
The existence and origin of large spatial temperature fluctuations in HII regions and planetary nebulae are assumed to explain the differences between the heavy element abundances…
Kinematics and physical properties of Southern interacting galaxies: the minor merger AM 2306-721
A. C. Krabbe, M. G. Pastoriza, Claudia Winge +2
We present an observational study about the effects of the interactions in the kinematics, stellar population and abundances of the components of the galaxy pair AM2306-721. Rotati…
The qWR star HD 45166. II. Fundamental stellar parameters and evidence of a latitude-dependent wind
J. H. Groh, A. S. Oliveira, J. E. Steiner
The enigmatic object HD 45166 is a qWR star in a binary system with an orbital period of 1.596 day, and presents a rich emission-line spectrum in addition to absorption lines from…
A multicolor near-infrared study of the dwarf nova IP Peg
T. Ribeiro, R. Baptista, E. T. Harlaftis +2
We report the analysis of light curves of the eclipsing dwarf nova IP Peg in quiescence. The light curves are dominated by the ellipsoidal variation of the mass-donor sta…
CAL 87 - an evolved wind-driven supersoft X-ray binary
A. S. Oliveira, J. E. Steiner
Compact binary supersoft X-ray sources (CBSS) are explained as being associated with hydrostatic nuclear burning on the surface of a white dwarf with high accretion rate. This high…
Transient jets in V617 Sagittarii
J. E. Steiner, A. S. Oliveira, C. A. O. Torres +1
Some of the luminous Compact Binary Supersoft X-Ray sources (CBSS) have shown indications of jets, also called satellites due to their appearance in the spectra. In V Sagittae (V S…
A study of the evolution of the accretion disk of V2051 Oph through two outburst cycles
R. Baptista, R. F. Santos, M. Faundez-Abans +1
We follow the changes in the structure of the accretion disk of the dwarf nova V2051 Oph along two separate outbursts in order to investigate the causes of its recurrent outbursts.…
The K luminosity-metallicity relation for dwarf galaxies and the tidal dwarf galaxies in the tails of HCG 31
Claudia L. Mendes de Oliveira, Sonia Temporin, Eduardo S. Cypriano +4
We determine a K-band luminosity-metallicity (K-Z) relation for dwarf irregular galaxies, over a large range of magnitudes, -20.5 < M_K < -13.5, using a combination of K photometry…
Shrinking of Cluster Ellipticals: a Tidal Stripping explanation and Implications for the Intra-Cluster Light
Eduardo S. Cypriano, Laerte Sodré, Luis E. Campusano +2
We look for evidence of tidal stripping in elliptical galaxies through the analysis of homogeneous CCD data corresponding to a sample of 228 elliptical galaxies belonging to 24 clu…
Assisted stellar suicide in V617 Sgr
J. E. Steiner, A. S. Oliveira, D. Cieslinski +1
V617 Sgr is a V Sagittae star - a group of binaries thought to be the galactic counterparts of the Compact Binary Supersoft X-ray Sources - CBSS. To check this hypothesis, we measu…
The luminosity function of the fossil group RX J1552.2+2013
Claudia L. Mendes de Oliveira, Eduardo S. Cypriano, Laerte Sodre
We determine the first fossil group luminosity function based on spectroscopy of the member galaxies. The fossil group RX J1552.2+2013 has 36 confirmed members, it is at a mean red…
Discovery and identification of the very high redshift afterglow of GRB 050904
J. Haislip, M. Nysewander, D. Reichart +39
In 2000, Lamb and Reichart predicted that gamma-ray bursts (GRBs) and their afterglows occur in sufficient numbers and at sufficient brightnesses at very high redshifts (z > 5) to…
Discovery of fourteen new ZZ Cetis with SOAR
S. O. Kepler, B. G. Castanheira, M. F. O. Saraiva +5
We report the discovery of fourteen new ZZ Cetis with the 4.1m Southern Astrophysical Research telescope, at Cerro Pachon, in Chile. The candidates were selected from the SDSS (Slo…
Gemini and Chandra observations of Abell 586, a relaxed strong-lensing cluster
E. S. Cypriano, G. B. Lima Neto, L. Sodré +2
We analyze the mass content of the massive strong-lensing cluster Abell 586 (). We use optical data (imaging and spectroscopy) obtained with the Gemini Multi-Object Spect…
3-D Kinematics of the HH 110 jet
Rosario Lopez, Robert Estalella, Alejandro C. Raga +3
We present new results on the kinematics of the jet HH 110. New proper motion measurements have been calculated from [SII] CCD images obtained with a time baseline of nearly fiftee…
3-D Photoionization Structure and Distances of Planetary Nebulae II. Menzel 1
Hektor Monteiro, Hugo E. Schwarz, Ruth Gruenwald +2
We present the results of a spatio-kinematic study of the planetary nebula Menzel 1 using spectro-photometric mapping and a 3-D photoionization code. We create several 2-D emission…
The Compact Group of Galaxies HCG 31 is in an early phase of merging
P. Amram, C. Mendes de Oliveira, H. Plana +1
We have obtained high spectral resolution (R = 45900) Fabry-Perot velocity maps of the Hickson Compact Group HCG 31 in order to revisit the important problem of the merger nature o…