Results 181 to 190 of about 205,088 (284)

Abundance gradients in the Galaxy derived from H II regions

, 1978
M. Peimbert, J. F. Rayo, S. Torres‐Peimbert   +2 more
openalex   +1 more source

Theoretical models of the planetary nebula populations in galaxies: The ISM oxygen abundance when star formation stops [PDF]

, 1997
M. G. Richer, M. L. McCall, N. Arimoto
openalex   +1 more source

Detection of the Actinide Th in an r-process-enhanced Star with Accretion Origin

The Astrophysical Journal
The thorium and six second-peak r -process element (56 ≤ Z ≤ 72) abundances are determined for the α -poor star LAMOST J1124+4535 based on a high-resolution spectrum obtained with the High Dispersion Spectrograph on the Subaru Telescope. The age of J1124+
Qianfan Xing, Gang Zhao, Wako Aoki, Haining Li, Jingkun Zhao, Tadafumi Matsuno, Takuma Suda   +6 more
doaj   +1 more source

Central oxygen abundances in the spiral galaxies of the MaNGA survey: Galaxies with central starbursts [PDF]

arXiv
We examine whether there are deviations of the local central oxygen abundances in spiral galaxies from the general metallicity gradients. We compare the values of the central intersect oxygen abundances estimated from the metallicity gradient based on the integral field unit (IFU) spectroscopy from the Mapping Nearby Galaxies at the Apache Point ...
arxiv  

I(CO)/N(H2) conversions and molecular gas abundances in spiral and irregular galaxies

, 1988
Philip R. Maloney, J. H. Black
openalex   +1 more source

Evidence of Truly Young High-α Dwarf Stars

The Astronomical Journal
The existence of high- α stars with inferred ages
Yuxi(Lucy) Lu, Isabel L. Colman, Maryum Sayeed, Louis Amard, Sven Buder, Catherine Manea, Soichiro Hattori, Marc H. Pinsonneault, Adrian M. Price-Whelan, Megan Bedell, David Nidever, Jennifer A. Johnson, Melissa Ness, Ruth Angus, Zachary R. Claytor, Danny Horta, Aida Behmard   +16 more
doaj   +1 more source

The Primordial Helium Abundance as Determined from Chemical Evolution of Irregular Galaxies

, 1993
M. J. Balbes, R. N. Boyd, Grant J. Mathews   +2 more
openalex   +1 more source

Chemo-dynamical Evolution of Simulated Satellites for a Milky Way–like Galaxy

The Astrophysical Journal
The chemical abundances of Milky Way’s (MW's) satellites reflect their star formation histories (SFHs), yet, due to the difficulty of determining the ages of old stars, the SFHs of most satellites are poorly measured.
Yutaka Hirai, Evan N. Kirby, Masashi Chiba, Kohei Hayashi, Borja Anguiano, Takayuki R. Saitoh, Miho N. Ishigaki, Timothy C. Beers   +7 more
doaj   +1 more source

Chemical evolution of irregular galaxies and the primordial He-4 abundance

, 1993
Grant J. Mathews, R. N. Boyd, George M. Fuller   +2 more
openalex   +1 more source

Metal Abundances in the Hot ISM of Elliptical Galaxies [PDF]

, 1998
Michael Loewenstein, R. F. Mushotzky
openalex   +1 more source