Results 41 to 50 of about 167,710 (319)

Thermohaline Mixing in Extremely Metal-poor Stars [PDF]

The Astrophysical Journal Letters, 2018
Abstract Extremely metal-poor (EMP) stars are an integral piece in the puzzle that is the early universe, and although anomolous subclasses of EMP stars such as carbon-enhanced metal-poor (CEMP) stars are well studied, they make up less than half of all EMP stars with [Fe/H] ∼ −3.0.
Kate Henkel, Amanda I. Karakas, Andrew R. Casey, Ross P. Church, John C. Lattanzio   +4 more
openaire   +2 more sources

Phase-space Properties and Chemistry of the Sagittarius Stellar Stream Down to the Extremely Metal-poor ([Fe/H] ≲ −3) Regime

The Astrophysical Journal, 2023
In this work, we study the phase-space and chemical properties of the Sagittarius (Sgr) stream, the tidal tails produced by the ongoing destruction of the Sgr dwarf spheroidal (dSph) galaxy, focusing on its very metal-poor (VMP; [Fe/H] < −2) content.
Guilherme Limberg, Anna B. A. Queiroz, Hélio D. Perottoni, Silvia Rossi, João A. S. Amarante, Rafael M. Santucci, Cristina Chiappini, Angeles Pérez-Villegas, Young Sun Lee   +8 more
doaj   +1 more source

ABOUT THE HEAVY ELEMENTS ABUNDANCES IN THE ATMOSPHERES OF STARS WITH LOW METALLICITY

Odessa Astronomical Publications, 2017
We present results of preliminary determinations of abundances of heavy elements in three metal-poor stars: HD37828, HD44008, HD221170. Careful comparison of observed and synthetic spectra permit us to increase the number of lines heavy elements ...
V. F. Gopka, A. V. Yushchenko, T. V. Mishenina, V. V. Kovtyukh   +3 more
doaj   +1 more source

Massive first star binaries as new tools for Galactic archaeology [PDF]

EPJ Web of Conferences, 2022
Binary systems are important probes of the origin of stars with peculiar chemical features through the interactions between two stars. We have studied the evolution of a metal-free massive binary after the collision of the supernova ejecta with a low ...
Suda Takuma, Saitoh Takayuki R., Moritani Yuki, Matsuno Tadafumi, Shigeyama Toshikazu   +4 more
doaj   +1 more source

Very Metal-poor Stars in the Outer Galactic Bulge Found by the Apogee Survey [PDF]

, 2013
Despite its importance for understanding the nature of early stellar generations and for constraining Galactic bulge formation models, at present little is known about the metal-poor stellar content of the central Milky Way.
Beers, Timothy C., Bizyaev, Dmitry, Cunha, Katia, Ebelke, Garrett, Eisenstein, Daniel J., Frinchaboy, Peter M., Girardi, Léo, Hearty, Fred R., Holtzman, Jon, Johnson, Jennifer A., Majewski, Steven R., Malanushenko, Elena, Malanushenko, Viktor, Meszaros, Szabolcs, Nidever, David, O'Connel, Robert W., Oravetz, Daniel, Pan, Kaike, Prieto, Carlos Allende, Pérez, Ana E. García, Robin, Annie C., Schiavon, Ricardo P., Schneider, Donald P., Schultheis, Mathias, Shetrone, Matthew, Simmonsand, Audrey, Skrutskie, Michael F., Smith, Verne V., Wilson, John C., Zasowski, Gail   +29 more
core   +4 more sources

GTC Follow-up Observations of Very Metal-poor Star Candidates from DESI

The Astrophysical Journal, 2023
The observations from the Dark Energy Spectroscopic Instrument (DESI) will significantly increase the numbers of known extremely metal-poor stars by a factor of ∼10, improving the sample statistics to study the early chemical evolution of the Milky Way ...
Carlos Allende Prieto, David S. Aguado, Jonay I. González Hernández, Rafael Rebolo, Joan Najita, Christopher J. Manser, Constance Rockosi, Zachary Slepian, Mar Mezcua, Monica Valluri, Rana Ezzeddine, Sergey E. Koposov, Andrew P. Cooper, Arjun Dey, Boris T. Gänsicke, Ting S. Li, Katia Cunha, Siwei Zou, Jessica Nicole Aguilar, Steven Ahlen, David Brooks, Todd Claybaugh, Shaun Cole, Sarah Eftekharzadeh, Kevin Fanning, Jaime Forero-Romero, Satya Gontcho A Gontcho, Klaus Honscheid, Pascale Jablonka, Robert Kehoe, Theodore Kisner, Martin Landriau, Axel de la Macorra, Aaron Meisner, Ramón Miquel, John Moustakas, Jundan Nie, Claire Poppett, Francisco Prada, Mehdi Rezaie, Graziano Rossi, Eusebio Sánchez, Michael Schubnell, Ray Sharples, Malgorzata Siudek, Verne V. Smith, Gregory Tarlé, Fiorenzo Vincenzo, Benjamin Alan Weaver, Zhimin Zhou, Hu Zou   +50 more
doaj   +1 more source

SEARCHING FOR DUST AROUND HYPER METAL POOR STARS [PDF]

The Astrophysical Journal, 2014
Accepted for publication in ...
Venn, Kim A., Puzia, Thomas H., Divell, Mike, Cote, Stephanie, Lambert, David L., Starkenburg, Else   +5 more
openaire   +4 more sources

High-Resolution Spectroscopic Study of Extremely Metal-Poor Star Candidates from the SkyMapper Survey [PDF]

, 2015
The SkyMapper Southern Sky Survey is carrying out a search for the most metal-poor stars in the Galaxy. It identifies candidates by way of its unique filter set that allows for estimation of stellar atmospheric parameters.
Asplund, Martin, Bessell, Michael S., Casey, Andrew R., Da Costa, Gary S., Frebel, Anna, Jacobson, Heather. R., Keller, Stefan, Lind, Karin, Marino, Anna F., Norris, John E., Pena, Jose M., Schmidt, Brian P., Tisserand, Patrick, Walsh, Jennifer M., Yong, David, Yu, Qinsi   +15 more
core   +2 more sources

Pulsating Blue Metal-poor Stars

The Astronomical Journal, 1999
The blue metal-poor (BMP) star CS 22966-043 is an SX Phoenicis star and the primary of a spectroscopic binary with a provisional orbital period of ~430 days. Radial velocity and UBV photometric observations of this star made in 1998 require downward revision of the orbital period to 319 days. The BMP star CS 29499-057 also appears to be an SX Phoenicis
George W. Preston, Arlo U. Landolt
openaire   +1 more source

Inefficient star formation in extremely metal poor galaxies [PDF]

Nature, 2014
Author's version (10 pages, 4 figures).
Shi, Yong, Armus, Lee, Helou, George, Stierwalt, Sabrina, Gao, Yu, Wang, Junzhi, Zhang, Zhi-Yu, Gu, Qiusheng   +7 more
openaire   +4 more sources