Results 31 to 40 of about 225,051 (342)

Probing the distinct chemical history of the Milky Way halo and old thick disk through HESP-GOMPA survey [PDF]

EPJ Web of Conferences
Recent studies of the time-resolved Milky Way formation using asteroseismology have shown that thick disk stars could be very old (0.8 Gyr after the Big Bang, even older than the inner halo).
Saraf Pallavi, Sivarani Thirupathi, Bandyopadhyay Avrajit   +2 more
doaj   +1 more source

Origins of the thick disk of the galaxy as traced by metal-poor stars selected from RAVE

EPJ Web of Conferences, 2012
Models of the formation of the thick disk of the Milky Way Galaxy make specific predictions about the chemical abundance properties of the metal-weak (and oldest) stellar population in the thick disk.
Ruchti G.R.
doaj   +1 more source

Nonextensive Behavior of Stellar Rotation in the Galactic Disk Components

The Astrophysical Journal, 2023
The solar neighborhood is a unique stellar astrophysical laboratory formed by a variety of stars from different origins. In particular, two of the most notable populations known are the thick and thin disk stars, each characterized by distinct chemical ...
M. P. da Silva, M. M. F. de Lima, E. N. Velloso, J.-D. do Nascimento Jr.   +3 more
doaj   +1 more source

Vertical Structure of the Milky Way Disk with Gaia DR3

Galaxies, 2023
Using a complete sample of about 330,000 dwarf stars, well measured by Gaia DR3, limited to the galactic north and south solid angles |b|700 pc and points to the presence of more stars beyond the thin disk that cannot be accounted for by the two-disk ...
Katherine Vieira, Vladimir Korchagin, Giovanni Carraro, Artem Lutsenko   +3 more
doaj   +1 more source

3D NUMERICAL HYDRODYNAMICAL MODELS OF THE PRECESSING THICK ACCRETION DISK AND ON- AND OFF-STATE GENERATIONS IN MICROQUASARS

Odessa Astronomical Publications, 2017
The thick accretion disk and donor’s wind on the example of CYG X-1 are computed. The main aim of the present simulations is to calculate the precessing thick accretion disk and ON- and OFF-state generation by the methods of 3D numerical hydrodynamics ...
V. V. Nazarenko, S. V. Nazarenko
doaj   +1 more source

Gauging the Galactic thick disk with RR Lyrae stars

EPJ Web of Conferences, 2012
In this contribution we present results from the QUEST RR Lyrae Survey of the thick disk. The survey spans ~480 sq. deg. at low latitude |b| < 30°, with multi-epoch VRI observations, obtained with the QUEST-I camera at the 1m Jürgen Stock Schmidt ...
Cruz G., Briceño C., Downes J.J., Vivas K., Mateu C.   +4 more
doaj   +1 more source

Chemical similarities between Galactic bulge and local thick disk red giant stars [PDF]

, 2008
The evolution of the Milky Way bulge and its relationship with the other Galactic populations is still poorly understood. The bulge has been suggested to be either a merger-driven classical bulge or the product of a dynamical instability of the inner ...
A. Alves-Brito, Alonso, Asplund, B. Barbuy, Ballero, Bensby, Bensby, C. Chiappini, Castelli, Cescutti, Chiappini, Collet, Cunha, D. Yong, da Silva, Demarque, Fulbright, Fulbright, Gratton, I. Ramírez, J. Meléndez, K. C. Freeman, K. Cunha, Kennicutt, Lecureur, M. Asplund, M. S. Bessell, McWilliam, Meléndez, Meléndez, Meléndez, Ramírez, Ramírez, Reddy, Rich, Salaris, Stanek, Tinsley, V. V. Smith, van der Kruit, van Leeuwen, Yong, Zoccali   +42 more
core   +2 more sources

Isotopic Titanium Abundances in Local M Dwarfs [PDF]

, 2009
Relative abundances of the five stable isotopes of titanium (^46Ti to ^50Ti) are measured for 11 M dwarfs belonging to the thin disk (four stars), thick disk (three stars), the halo (one star), and either the thick or the thin disk (three stars).
Asplund, Bean, Chieffi, Cutri, David L. Lambert, Dawson, Delfosse, Gliese, Goswami, Hauschildt, Hauschildt, Hughes, Huss, Iwamoto, Johnson, Joy Chavez, Kobayashi, Kurucz, Kurucz, Lambert, Lodders, Lugaro, Martinache, Moore, Perryman, Plez, Reid, Reid, Rojas-Ayala, Sneden, Thielemann   +30 more
core   +2 more sources

Exploring the Evolution of Massive Clumps in Simulations That Reproduce the Observed Milky Way α-element Abundance Bimodality

The Astrophysical Journal, 2023
The Milky Way (MW) stellar disk has both a thin and a thick component. The thin disk is composed mostly of younger stars (≲8 Gyr) with a lower abundance of α -elements, while the thick disk contains predominantly older stars (≳8–12 Gyr) with a higher α ...
Bethany R. Garver, David L. Nidever, Victor P. Debattista, Leandro Beraldo e Silva, Tigran Khachaturyants   +4 more
doaj   +1 more source

Red Thick Disks of Nearby Galaxies [PDF]

The Astronomical Journal, 2005
Edge on systems reveal the properties of disk galaxies as a function of height, z, above the plane. Four local edge-on galaxies, that are close enough to have been resolved into stars by the Hubble Space Telescope, show thick disks, composed of a red stellar population, which is old and relatively metal rich.
openaire   +3 more sources