Results 31 to 40 of about 222,812 (342)

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

Thick disks of lenticular galaxies [PDF]

Astronomy & Astrophysics, 2004
Thick disks are faint and extended stellar components found around several disk galaxies including our Milky Way. The Milky Way thick disk, the only one studied in detail, contains mostly old disk stars (≈ 10 Gyr), so that thick disks are likely to trace the early stages of disk evolution.
M. Pohlen, M. Balcells, R. Lütticke, R.-J. Dettmar   +3 more
openaire   +3 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

The Thick Disk in the Galaxy NGC 4244 from S^4G Imaging [PDF]

, 2010
If thick disks are ubiquitous and a natural product of disk galaxy formation and/or evolution processes, all undisturbed galaxies that have evolved during a significant fraction of a Hubble time should have a thick disk. The late-type spiral galaxy NGC
Athanassoula, E., Bosma, Albert, Buta, Ronald J., Comerón, Sébastien, Elmegreen, Bruce G., Gil de Paz, Armando, Hinz, Joannah L., Ho, Luis C., Holwerda, Benne W., Kim, Taehyun, Knapen, Johan H., Laurikainen, Eija, Menéndez-Delmestre, Karín, Muñoz-Mateos, Juan-Carlos, Regan, Michael W., Salo, Heikki, Schinnerer, Eva, Seibert, Mark, Sheth, Kartik   +18 more
core   +5 more sources

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

Fractional yields inferred from halo and thick disk stars [PDF]

Serbian Astronomical Journal, 2013
Linear [Q/H]-[O/H] relations, Q = Na, Mg, Si, Ca, Ti, Cr, Fe, Ni, are inferred from a sample (N = 67) of recently studied FGK-type dwarf stars in the solar neighbourhood including different populations (Nissen and Schuster 2010, Ramirez et al ...
Caimmi R.
doaj   +1 more source