Results 41 to 50 of about 221,035 (206)

Axisymmetric elasticity solution for an undrained saturated poro-piezoelastic thick disk [PDF]

Theoretical and Applied Mechanics, 2019
In this paper, a circular thick plate made of poroelastic piezoelectric ceramic is studied. The porosities of the plate vary through the thickness and axisymmetric behavior of a piezoelectric disk exhibiting hexagonal material symmetry of class 6 mm ...
Abjadi Ali, Jabbari Mohsen, Khorshidvand Reza Ahmad   +2 more
doaj   +1 more source

Kinematics, ages and metallicities for F and G type stars in the solar neighbourhood

, 2005
A new metallicity distribution and an age-metallicity relation are presented for 437 nearby F and G turn-off and sub-giant stars selected from radial velocity data of Nidever et al.
Allen, Arce, Bensby, Bensby, Bensby, Bergbusch, Butler, Carney, Cayrel de Strobel, Cenarro, Chen, Chen, Clem, Crawford, Croswell, Edvardsson, Eggen, Feltzing, Friel, Fukugita, Fulbright, Giménez, Gonzalez, Hauck, Henry, Høg, Johnson, Kerr, Kharchenko, Laughlin, Lutz, Martell, Mishenina, Murray, Nidever, Nissen, Nissen, Nissen, Nordström, Norris, Pilyugin, Pompéia, Raiteri, Reid, Rocha-Pinto, S. Bilir, Santos, Santos, Schlegel, Schuster, Schuster, Schuster, Schuster, Taylor, Twarog, Twarog, Vogt, W. J. Schuster, Wheeler, Y. Karataş   +59 more
core   +1 more source

On the Formation of Planets in the Milky Way’s Thick Disk

The Astrophysical Journal
Exoplanet demographic surveys have revealed that close-in (≲1 au) small planets orbiting stars in the Milky Way’s thick disk are ∼50% less abundant than those orbiting stars in the Galactic thin disk.
Tim Hallatt, Eve J. Lee
doaj   +1 more source

The stellar populations of the Milky Way in CFHTLS fields

EPJ Web of Conferences, 2012
We investigate the characteristics of the thick disk in the Canada – France – Hawaii – Telescope Legacy Survey (CFHTLS) fields, complemented at bright magnitudes with Sloan Digital Sky Survey (SDSS) data.
Haywood M., Guittet M., Schultheis M.
doaj   +1 more source

Fluorine Abundances in Local Stellar Populations

The Astronomical Journal
We present the first fluorine measurements in 12 normal K giants belonging to the Galactic thin and thick disks using spectra obtained with the Phoenix infrared spectrometer on the 2.1 m telescope at Kitt Peak. Abundances are determined from the (1−0) R9
K. E. Brady, C. A. Pilachowski, V. Grisoni, Z. G. Maas, K. A. Nault   +4 more
doaj   +1 more source

Kinematic and chemical components in the solar neighbourhood

EPJ Web of Conferences, 2012
Abundance data on solar neighbourhood stars suggest the presence of chemically-distinct stellar components in the solar neighbourhood. When the abundances of Fe, α elements, and the r-process element Eu are considered together, stars separate neatly into
Navarro J.F.
doaj   +1 more source

Mapping the Chemodynamics of the Galactic Disk Using the LAMOST and APOGEE Red Clump Stars

The Astrophysical Journal Supplement Series
A detailed measurement is made of the metallicity distributions, kinematics, and dynamics of the thin and thick disks across a large disk volume (5.0 ≤ R ≤ 15.0 kpc and ∣ Z ∣ ≤ 3.0 kpc) by using the LAMOST–APOGEE red clump stars.
Weixiang Sun, Han Shen, Biwei Jiang, Xiaowei Liu   +3 more
doaj   +1 more source

A Comparison of the Chemical Evolutionary Histories of the Galactic Thin Disk and Thick Disk Stellar Populations

, 2005
We have studied 23 long-lived G dwarfs that belong to the thin disk and thick disk stellar populations. Abundances have been derived for 24 elements: O, Na, Mg, Al, Si, Ca, Ti, Sc, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Y, Zr, Ba, La, Ce, Nd, and Eu. We find
Alonso A., Asiain R., Bruce W. Carney, Carretta E., Edvardsson B., Fuhrmann K., Gilmore G., Gilmore G., Gratton R. G., Grevesse N., Jenkins A., Kiselman D., Kiselman D., Mary-Margaret Brewer, Mashonkina L., Nissen P. E., Olsen E. H., Perryman M. A. C., Sandage A., Schuster W. J., Tody D., Zhao G.   +21 more
core   +2 more sources

The Kinematic Signature of the Warp and Waves in the Milky Way Disk

The Astrophysical Journal
Using over 170,000 red clump (RC) stars selected from LAMOST and APOGEE, we conduct a detailed analysis of the stellar V _Z as a function of L _Z (or R _g ) across different ϕ bins for various disk populations.
Weixiang Sun, Han Shen, Biwei Jiang, Xiaowei Liu   +3 more
doaj   +1 more source

The Milky Way as a High Redshift Galaxy: The Importance of Thick Disk Formation in Galaxies

, 2014
We compare the star-formation history and dynamics of the Milky Way (MW) with the properties of distant disk galaxies. During the first ~4 Gyr of its evolution, the MW formed stars with a high star-formation intensity (SFI), Sigma_SFR~0.6 Msun/yr/kpc2 ...
Di Matteo, Paola, Haywood, Misha, Lehnert, Matthew D., Snaith, Owain N.   +3 more
core   +2 more sources