79 citations · 346 across the 22 of their papers we have counts for
18 papers · 1 filter
An abundance analysis from the STIS-HST UV spectrum of the non-magnetic Bp star HR 6000
F. Castelli, C. R. Cowley, T. R. Ayres +2
The sharp-line spectrum of the Bp star HR 6000 has peculiarities that distinguish it from those of the HgMn stars with which it is sometimes associated. The position of the star cl…
A study of the elements copper through uranium in Sirius A: Contributions from STIS and ground-based spectra
Charles R. Cowley, Thomas R. Ayres, Fiorella Castelli +3
We determine abundances or upper limits for all of the 55 stable elements from copper to uranium for the A1 Vm star Sirius. The purpose of the study is to assemble the most complet…
New Mn II energy levels from STIS-HST spectrum of the HgMn star HD 175640
F. Castelli, R. L. Kurucz, C. R. Cowley
The NIST database lists several Mn II lines that were observed in the laboratory but not classified. They cannot be used in spectrum synthesis because their atomic line data are un…
Abundance sensitive points of line profiles in the stellar spectra
V. A. Sheminova, C. R. Cowley
Many abundance studies are based on spectrum synthesis and -squared differences between the synthesized and an observed spectrum. Much of the spectra so compared depend only wea…
Dynamical detection of three triple stellar systems in open clusters
J. F. Gonzalez, M. E. Veramendi, C. R. Cowley
We present a kinematic analysis of three triple stellar systems belonging to two open clusters: CPD-60°961 and HD66137 in NGC2516, and HD315031 in NGC6530. All three systems are hi…
Chemical abundances of the high-latitude Herbig Ae Star PDS2
C. R. Cowley, S. Hubrig, N. Przybilla
The Herbig Ae star PDS2 (CD -53 251) is unusual in several ways. It has a high Galactic latitude, unrelated to any known star-forming region. It is at the cool end of the Herbig Ae…
Magnetic fields of Herbig Ae/Be stars
S. Hubrig, I. Ilyin, M. Schoeller +5
We report on the status of our spectropolarimetric studies of Herbig Ae/Be stars carried out during the last years. The magnetic field geometries of these stars, investigated with…
Line identification in high-resolution, near-infrared CRIRES spectra of chemically peculiar and Herbig Ae stars
S. Hubrig, F. Castelli, J. F. Gonzalez +5
The recent availability of ESO's high-resolution spectrograph CRIRES offers now the opportunity to study numerous spectral features in the near-IR in intermediate-mass main-sequenc…
The narrow, inner CO ring around the magnetic Herbig Ae star, HD 101412
C. R. Cowley, S. Hubrig, F. Castelli +1
We describe and model emission lines in the first overtone band of CO in the magnetic Herbig Ae star HD 101412. High-resolution CRIRES spectra reveal unusually sharp features which…
Characterising the magnetic fields of the Herbig Ae/Be stars HD97048, HD150193, HD176386, and MWC480
S. Hubrig, M. Schoeller, I. Ilyin +6
Our knowledge of the presence and the role of magnetic fields in intermediate-mass pre-main-sequence stars remains very poor. We present the magnetic properties of four Herbig Ae/B…
The absorption and emission spectrum of the magnetic Herbig Ae star HD 190073
C. R. Cowley, S. Hubrig
We determine abundances from the absorption spectrum of the magnetic Herbig Ae star HD 190073 (V1295 Aql). The observations are primarily from HARPS spectra obtained at a single ep…
Spectroscopic variability and magnetic fields of HgMn stars
S. Hubrig, J. F. Gonzalez, I. Ilyin +7
The discovery of exotic abundances, chemical inhomogeneities, and weak magnetic fields on the surface of late B-type primaries in spectroscopic binaries has important implications…
Search of X-ray emission from roAp stars: The case of gamma Equulei
B. Stelzer, C. A. Hummel, M. Schöller +2
The detection of X-ray emission from Ap stars can be an indicator for the presence of magnetic activity and dynamo action, provided different origins for the emission, such as wind…
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…
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…
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…
Stratification and Isotope Separation in CP Stars
C. R. Cowley, S. Hubrig, F. G. Gonzalez
We investigate the elemental and isotopic stratification in the atmospheres of selected chemically peculiar (CP) stars of the upper main sequence. Reconfiguration of the UVES spect…