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9 papers · 2 filters
Dynamics of blue compact galaxies, as revealed by their H-alpha velocity fields I. The data, velocity fields and rotation curves
G. Östlin, P. Amram, J. Masegosa +2
Observations of six luminous blue compact galaxies (BCGs) and two star forming companion galaxies were carried out with the CIGALE scanning Fabry-Perot interferometer attached to t…
The nature of the circumstellar CO_2 emission from M giants
N. Ryde, K. Eriksson, B. Gustafsson
The 13-16 um region observed by the Infrared Space Observatory (ISO) of several ABG stars are discussed. We present and analyse spectra of seven M giants which show carbon dioxide…
The origin of carbon, investigated by spectral analysis of solar-type stars in the Galactic Disk
B. Gustafsson, T. Karlsson, E. Olsson +2
Abundance analysis of carbon has been performed in a sample of 80 late F and early G type dwarf stars in the metallicity range -1.06 < [Fe/H] < 0.26 using the forbidden [C I] line…
The luminosity function of white dwarfs and M dwarfs, using dark nebulae as opaque outer screens
Leif Festin
By using dark nebulae as opaque outer screens, the luminosity function of white dwarfs and M dwarfs has been studied. High-extinction areas towards the Orion A, Serpens and rho Oph…
iota Cas: Multi-element Doppler imaging and magnetic field geometry
R. Kuschnig, G. A. Wade, G. M. Hill +1
In order to clarify the role of the magnetic field in generating abundance inhomogeneities in the atmospheres of Ap stars, we present new abundance Doppler images and an approximat…
Eu III identification and Eu abundance in cool CP stars
T. Ryabchikova, N. Piskunov, I. Savanov +1
We report the first identification of the Eu III lambda 6666.317 line in optical spectra of CP stars. This line is clearly present in the spectra of HR 4816, 73 Dra, HR 7575, and b…
CMB Anisotropy in the Decaying Neutrino Cosmology
J. A. Adams, Subir Sarkar, D. W. Sciama
It is attractive to suppose for several astrophysical reasons that the universe has close to the critical density in light (~30 eV) neutrinos which decay radiatively with a lifetim…
Boron in Very Metal-Poor Stars
R. J. Garcia Lopez, D. L. Lambert, B. Edvardsson +3
We have observed the B I 2497 A line to derive the boron abundances of two very metal-poor stars selected to help in tracing the origin and evolution of this element in the early G…
Abundance similarities between the R CrB star V854 Cen and the born-again Sakurai's object
M. Asplund, B. Gustafsson, N. K. Rao +1
The elemental abundances of the mildly hydrogen-deficient R Coronae Borealis (R CrB) star V854 Cen have been estimated. The R CrB stars have been divided into majority and minority…