1.2k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Consejo Nacional de Investigaciones Científicas y TécnicasAR105 papers
- National University of San JuanAR51 papers
- University of La SerenaCL38 papers
- Institute of Astronomy and Space PhysicsAR34 papers
- European Southern ObservatoryCL28 papers
- Argentine National ObservatoryAR25 papers
- Universidad Nacional de La PlataAR25 papers
- Leibniz Institute for Astrophysics PotsdamDE24 papers
- Universidad de Buenos AiresAR23 papers
- Instituto de Astrofísica de La Plata20 papers
- Universidad Nacional de CórdobaAR18 papers
- Centro Científico Tecnológico - San JuanAR16 papers
20 papers · 1 filter
Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum
C. G. Díaz, J. F. González, H. Levato +1
We propose a method for measuring the projected rotational velocity with high-precision even in spectra with blended lines. Though not automatic, our method is designed t…
Rotationally modulated variations and the mean longitudinal magnetic field of the Herbig Ae star HD 101412
S. Hubrig, Z. Mikulasek, J. F. Gonzalez +8
Despite of the importance of magnetic fields for the full understanding of the properties of accreting Herbig Ae/Be stars, these fields have scarcely been studied over the rotation…
Chemical spots and their dynamical evolution on HgMn stars
Heidi Korhonen, Swetlana Hubrig, Maryline Briquet +2
Our recent studies of late B-type stars with HgMn peculiarity revealed for the first time the presence of fast dynamical evolution of chemical spots on their surfaces. These observ…
Lanthanides and other spectral oddities in a Centauri
C. R. Cowley, S. Hubrig, J. F. Gonzalez
Context: There is considerable interest in the helium variable a Cen as a bridge between helium-weak and helium-strong CP stars. Aims: We investigate Ce III and other possible lant…
Multicomponent fluids of hard hyperspheres in odd dimensions
René D. Rohrmann, Andrés Santos
Mixtures of hard hyperspheres in odd space dimensionalities are studied with an analytical approximation method. This technique is based on the so-called Rational Function Approxim…
Lyman-alpha wing absorption in cool white dwarf stars
R. D. Rohrmann, L. G. Althaus, S. O. Kepler
Kowalski & Saumon (2006) identified the missing absorption mechanism in the observed spectra of cool white dwarf stars as the Ly-alpha red wing formed by the collisions between ato…
FUNDPAR: A Program for deriving Fundamental Parameters from Equivalent Widths
Carlos Saffe
We implemented a fortran code that determine fundamental parameters of solar type stars from a list of Fe line equivalent widths. The solution should verify 3 conditions in the sta…
Abundances in the Herbig Ae star HD 101412: Abundance anomalies; Lambda Boo-Vega characteristics?
C. R. Cowley, S. Hubrig, J. F. González +1
Context: Recent attention has been directed to abundance variations among very young stars. Aims: To perform a detailed abundance study of the Herbig Ae star HD 101412, taking adva…
Evolution of white dwarf stars with high-metallicity progenitors: the role of 22Ne diffusion
Leandro G. Althaus, Enrique García-Berro, Isabel Renedo +3
Motivated by the strong discrepancy between the main sequence turn-off age and the white dwarf cooling age in the metal-rich open cluster NGC 6791, we compute a grid of white dwarf…
A white dwarf cooling age of 8 Gyr for NGC 6791 from physical separation processes
Enrique García-Berro, Santiago Torres, Leandro G. Althaus +6
NGC 6791 is a well studied open cluster1 that it is so close to us that can be imaged down to very faint luminosities. The main sequence turn-off age (~8 Gyr) and the age derived f…
Evidence of small-scale magnetic concentrations dragged by vortex motion of solar photospheric plasma
L. Balmaceda, S. Vargas Domínguez, J. Palacios +2
Vortex-type motions have been measured by tracking bright points in high-resolution observations of the solar photosphere. These small-scale motions are thought to be determinant i…
Dynamical evolution of titanium, strontium, and yttrium spots on the surface of the HgMn star HD 11753
M. Briquet, H. Korhonen, J. F. Gonzalez +2
Aims. We gathered about 100 high-resolution spectra of three typical HgMn (mercury-manganese) stars, HD 11753, HD 53244, and HD 221507, to search for slowly pulsating B-like pulsat…
The slow roll condition and the amplitude of the primordial spectrum of cosmic fluctuations: Contrasts and similarities of standard account and the "collapse scheme"
Gabriel Leon, Daniel Sudarsky
The inflationary paradigm enjoys a very wide acceptance in the cosmological community, due in large part to the fact that it is said to "naturally account" for a nearly scale indep…
Metallicity of high stellar mass galaxies with signs of merger events
M. S. Alonso, L. Michel-Dansac, D. G. Lambas
We focus on an analysis of galaxies of high stellar mass and low metallicity. We cross-correlated the Millenium Galaxy Catalogue (MGC) and the Sloan Digital Sky Survey (SDSS) galax…
Early Results from the Galactic O-Star Spectroscopic Survey: C III Emission Lines in Of Spectra
Nolan R. Walborn, Alfredo Sota, Jesus Maiz Apellaniz +5
On the basis of an extensive new spectroscopic survey of Galactic O stars, we introduce the Ofc category, which consists of normal spectra with C III λ\lambda4647-4650-4652 emissio…
The exceptional Herbig Ae star HD101412: The first detection of resolved magnetically split lines and the presence of chemical spots in a Herbig star
S. Hubrig, M. Schoeller, I. Savanov +5
We obtained high-resolution, high signal-to-noise UVES and a few lower quality HARPS spectra revealing the presence of resolved magnetically split lines. HD101412 is the first Herb…
HD 65949: Rosetta Stone or Red Herring
C. R. Cowley, S. Hubrig, P. Palmeri +5
HD 65949 is a late B star with exceptionally strong Hg II at 3984[A], but it is not a typical HgMn star. The Re II spectrum is of extraordinary strength. Abundances, or upper limit…
The Onfp Class in the Magellanic Clouds
Nolan R. Walborn, Ian D. Howarth, Christopher J. Evans +8
The Onfp class of rotationally broadened, hot spectra was defined some time ago in the Galaxy, where its membership to date numbers only eight. The principal defining characteristi…
On the multiplicity of the zero-age main-sequence O star Herschel 36
Julia I. Arias, Rodolfo H. Barba, Roberto C. Gamen +6
We present the analysis of high-resolution optical spectroscopic observations of the zero-age main-sequence O star Herschel 36 spanning six years. This star is definitely a multipl…
AO Vel: The role of multiplicity in the development of chemical peculiarities in late B-type stars
J. F. González, S. Hubrig, F. Castelli
We present high-resolution, high signal-to-noise UVES spectra of AO Vel, a quadruple system containing an eclipsing BpSi star. From these observations we reconstruct the spectra of…