Results 21 to 30 of about 876,778 (355)

On the Hunt for the Origins of the Orphan–Chenab Stream: Detailed Element Abundances with APOGEE and Gaia

The Astrophysical Journal, 2023
Stellar streams in the Galactic halo are useful probes of the assembly of galaxies like the Milky Way. Many tidal stellar streams that have been found in recent years are accompanied by a known progenitor globular cluster or dwarf galaxy.
Keith Hawkins, Adrian M. Price-Whelan, Allyson A. Sheffield, Aidan Z. Subrahimovic, Rachael L. Beaton, Vasily Belokurov, Denis Erkal, Sergey E. Koposov, Richard R. Lane, Chervin F. P. Laporte, Christian Nitschelm   +10 more
doaj   +1 more source

Stellar Tidal Disruption Events with Abundances and Realistic Structures (STARS): Library of Fallback Rates [PDF]

Astrophysical Journal, 2020
We present the STARS library, a grid of tidal disruption event (TDE) simulations interpolated to provide the mass fallback rate (dM/dt) to the black hole for a main-sequence star of any stellar mass, stellar age, and impact parameter.
J. Law-Smith, D. Coulter, J. Guillochon, B. Mockler, E. Ramirez-Ruiz   +4 more
semanticscholar   +1 more source

The Southern Stellar Stream Spectroscopic Survey (S5): Chemical Abundances of Seven Stellar Streams [PDF]

Astronomical Journal, 2020
We present high-resolution Magellan/MIKE spectroscopy of 42 red giant stars in seven stellar streams confirmed by the Southern Stellar Stream Spectroscopic Survey (S5): ATLAS, Aliqa Uma, Chenab, Elqui, Indus, Jhelum, and Phoenix.
A. Ji, Ting S. Li, T. Hansen, A. Casey, Sergey E. Koposov, A. Pace, D. Mackey, G. Lewis, J. Simpson, J. Bland-Hawthorn, L. Cullinane, G. Costa, Kohei Hattori, S. Martell, K. Kuehn, D. Erkal, N. Shipp, Z. Wan, D. Zucker   +18 more
semanticscholar   +1 more source

The Metallicity and Distance of Leo A from Blue Supergiants

The Astrophysical Journal, 2023
We have obtained high-quality spectra of blue supergiant candidates in the dwarf irregular galaxy Leo A with the Low Resolution Imaging Spectrometer at the Keck I telescope.
Miguel A. Urbaneja, Fabio Bresolin, Rolf-Peter Kudritzki   +2 more
doaj   +1 more source

SPCANet: Stellar Parameters and Chemical Abundances Network for LAMOST-II Medium Resolution Survey [PDF]

Astrophysical Journal, 2020
The fundamental stellar atmospheric parameters (Teff and log g) and 13 chemical abundances are derived for medium-resolution spectroscopy from Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Medium Resolution Survey (MRS) data sets ...
Rui Wang, A. Luo, Jian-Jun Chen, W. Hou, Shuo Zhang, Yongheng Zhao, Xiangru Li, Yong-Hui Hou   +7 more
semanticscholar   +1 more source

Chemical Analysis of the Brightest Star of the Cetus II Ultrafaint Dwarf Galaxy Candidate

The Astrophysical Journal, 2023
We present a detailed chemical abundance analysis of the brightest star in the ultrafaint dwarf (UFD) galaxy candidate Cetus II from high-resolution Magellan/MIKE spectra.
K. B. Webber, T. T. Hansen, J. L. Marshall, J. D. Simon, A. B. Pace, B. Mutlu-Pakdil, A. Drlica-Wagner, C. E. Martínez-Vázquez, M. Aguena, S. S. Allam, O. Alves, E. Bertin, D. Brooks, A. Carnero Rosell, J. Carretero, L. N. da Costa, J. De Vicente, P. Doel, I. Ferrero, D. Friedel, J. Frieman, J. García-Bellido, G. Giannini, D. Gruen, R. A. Gruendl, S. R. Hinton, D. L. Hollowood, K. Honscheid, K. Kuehn, J. Mena-Fernández, F. Menanteau, R. Miquel, R. L. C. Ogando, M. E. S. Pereira, A. Pieres, A. A. Plazas Malagón, E. Sanchez, B. Santiago, J. Allyn Smith, M. Smith, E. Suchyta, G. Tarle, C. To, N. Weaverdyck, B. Yanny   +44 more
doaj   +1 more source

Resolved Multi-element Stellar Chemical Abundances in the Brightest Quiescent Galaxy at z ∼ 2 [PDF]

Astrophysical Journal, 2020
Measuring the chemical composition of galaxies is crucial to our understanding of galaxy formation and evolution models. However, such measurements are extremely challenging for quiescent galaxies at high redshifts, which have faint stellar continua and ...
M. Jafariyazani, A. Newman, B. Mobasher, S. Belli, R. Ellis, S. Patel   +5 more
semanticscholar   +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

Stellar abundances in the early galaxy and two r-process components [PDF]

, 2000
Y.‐Z. Qian, G. J. Wasserburg
openalex   +3 more sources

Evidence for Sub-Chandrasekhar Type Ia Supernovae from Stellar Abundances in Dwarf Galaxies [PDF]

Astrophysical Journal, 2019
There is no consensus on the progenitors of Type Ia supernovae (SNe Ia) despite their importance for cosmology and chemical evolution. We address this question using our previously published catalogs of Mg, Si, Ca, Cr, Fe, Co, and Ni abundances in dwarf ...
E. Kirby, Justin L. Xie, Rachel Guo, Mithi A. C. de los Reyes, M. Bergemann, M. Kovalev, K. Shen, A. Piro, A. McWilliam   +8 more
semanticscholar   +1 more source