Results 11 to 20 of about 464,371 (256)

Connecting the primordial and Galactic deuterium abundances [PDF]

, 2007
The deuterium abundances inferred from observations of the interstellar medium within 1-2 kpc of the Sun range over a factor of three and the corresponding oxygen abundances show an even larger dispersion.
Romano, Donatella, Steigman, Gary, Tosi, Monica   +2 more
core   +3 more sources

Neon and Sulfur Abundances of Planetary Nebulae in the Magellanic Clouds [PDF]

, 2007
The chemical abundances of neon and sulfur for 25 planetary nebulae (PNe) in the Magellanic Clouds are presented. These abundances have been derived using mainly infrared data from the Spitzer Space Telescope.
Aller L. H., de Graauw T., Feldman U., Fluks M. A., Grevesse N., J. Bernard‐Salas, J. R. Houck, Monk D. J., P. W. Morris, Pena M., S. Gutenkunst, S. R. Pottasch, Zijlstra A. A.   +12 more
core   +4 more sources

Chemical Composition of RM_1-390 - Large Magellanic Cloud Red Supergiant [PDF]

Journal of Astronomy and Space Sciences, 2017
A high resolution spectroscopic observation of the red supergiant star RM_1-390 in the Large Magellanic Cloud was made from a 3.6 m telescope at the European Southern Observatory. Spectral resolving power was R=20,000, with a signal-to-noise ratio S/N >
Alexander V. Yushchenko, Yeuncheol Jeong, Vira F. Gopka, Svetlana V. Vasil’eva, Sergey M. Andrievsky, Volodymyr O. Yushchenko   +5 more
doaj   +1 more source

Fe I and Fe II Abundances of Solar-Type Dwarfs in the Pleiades Open Cluster [PDF]

, 2010
We have derived Fe abundances of 16 solar-type Pleiades dwarfs by means of an equivalent width analysis of Fe I and Fe II lines in high-resolution spectra obtained with the Hobby - Eberly Telescope and High Resolution Spectrograph.
Adele L. Plunkett, Adele L. Plunkett, Jeremy R. King, Jeremy R. King, Marc H. Pinsonneault, Marc H. Pinsonneault, Simon C. Schuler, Simon C. Schuler   +7 more
core   +4 more sources

MANGANESE ABUNDANCES IN THE ATMOSPHERE OF CLUMP GIANTS

Odessa Astronomical Publications, 2013
The manganese abundances was determined in the atmospheres of clump giants stars whose election was made earlier based on their chemical composition and evolutionary tracks. The spectra of the studied stars were obtained using the facilities of the 1.93m
T. I. Gorbaneva
doaj   +1 more source

Close Binaries and the Abundance Discrepancy Problem in Planetary Nebulae

Galaxies, 2018
Motivated by the recent establishment of a connection between central star binarity and extreme abundance discrepancies in planetary nebulae, we have carried out a spectroscopic survey targeting planetary nebula with binary central stars and previously ...
R. Wesson, D. Jones, J. García-Rojas, H. M. J. Boffin, R. L. M. Corradi   +4 more
doaj   +1 more source

Elemental Abundances in the X-Ray Gas of Early-Type Galaxies with XMM and Chandra Observations [PDF]

, 2009
The source of hot gas in elliptical galaxies is thought to be due to stellar mass loss, with contributions from supernova events and possibly from infall from a surrounding environment.
Alex Athey, Arimoto, Athey, Brown, Buote, Buote, de Vaucouleurs, Edward J. Lloyd-Davies, Fabbiano, Humphrey, Irwin, Irwin, Jimmy A. Irwin, Joel N. Bregman, Jones, Jun Ji, Kim, Kim, Machacek, Minniti, O'Sullivan, Park, Randall, Randall, Smith, Tawara, Tonry, Trager, Xu   +28 more
core   +1 more source

Theoretical Predictions of Surface Light Element Abundances in Protostellar and Pre-Main Sequence Phase

Frontiers in Astronomy and Space Sciences, 2021
Theoretical prediction of surface stellar abundances of light elements–lithium, beryllium, and boron–represents one of the most interesting open problems in astrophysics.
E. Tognelli, E. Tognelli, S. Degl’Innocenti, S. Degl’Innocenti, P. G. Prada Moroni, P. G. Prada Moroni, L. Lamia, L. Lamia, L. Lamia, R. G. Pizzone, A. Tumino, A. Tumino, C. Spitaleri, C. Spitaleri, A. Chiavassa   +14 more
doaj   +1 more source

Non-LTE Abundances of Magnesium, Aluminum and Sulfur in OB Stars Near the Solar Circle [PDF]

, 2002
Non-LTE abundances of magnesium, aluminum and sulfur are derived for a sample of 23 low-v \sin i stars belonging to six northern OB associations of the Galactic disk within 1 kpc of the Sun.
Afflerbach, Andrievsky, Daflon, Daflon, Daflon, Deharveng, Dufton, Gies, Grevesse, Gummersbach, Heger, K. Butler, K. Cunha, McNamara, Mihalas, Przybilla, S. Daflon, Simpson, V. V. Smith, Vrancken, Vrancken, Vrancken   +21 more
core   +3 more sources

Chemical Composition of RR Lyn – an Eclipsing Binary System with Am and λ Boo Type Components [PDF]

Journal of Astronomy and Space Sciences, 2017
High-resolution spectroscopic observations of the eclipsing binary system RR Lyn were made using the 1.8 m telescope at the Bohuynsan Optical Astronomical Observatory in Korea.
Yeuncheol Jeong, Alexander V. Yushchenko, Dmytry N. Doikov, Vira F. Gopka, Volodymyr O. Yushchenko   +4 more
doaj   +1 more source