Results 71 to 80 of about 4,406,721 (399)

Recent Development of the Atomic Line List

Galaxies, 2018
The Atomic Line List is an online database of wavelengths and transition probabilities of atomic lines. It is primarily set up as a tool to help identify unknown spectral features.
Peter A. M. van Hoof
doaj   +1 more source

Screening Earth Analog Exoplanets on the Basis of a Predicted Nitrogen over Phosphorus Ratio

The Astrophysical Journal, 2023
Since the first discovery in 1995, data for over 5300 exoplanets have been documented in the NASA archive, revealing a vast diversity. Identifying life-enabling analogs of the Earth among this rapidly expanding catalog is of major interest. The stability
Hervé Toulhoat
doaj   +1 more source

ASPCAP: THE APOGEE STELLAR PARAMETER AND CHEMICAL ABUNDANCES PIPELINE [PDF]

, 2015
The Apache Point Observatory Galactic Evolution Experiment (APOGEE) has built the largest moderately high-resolution (R ≈ 22,500) spectroscopic map of the stars across the Milky Way, and including dust-obscured areas.
A. G. García Pérez, C. Prieto, J. Holtzman, M. Shetrone, S. M'esz'aros, D. Bizyaev, R. Carrera, K. Cunha, D. A. Garc'ia-Hern'andez, Jennifer A. Johnson, S. Majewski, D. Nidever, R. Schiavon, N. Shane, V. Smith, J. Sobeck, N. Troup, O. Zamora, D. Weinberg, J. Bovy, D. Eisenstein, D. Feuillet, P. Frinchaboy, M. Hayden, F. Hearty, D. Nguyen, R. O’Connell, M. Pinsonneault, John C. Wilson, G. Zasowski   +29 more
semanticscholar   +1 more source

Chemical Abundances and Hierarchical Clustering [PDF]

Symposium - International Astronomical Union, 2004
In this contribution we study the chemical enrichment of the interstellar medium and stellar population of the building blocks of current typical galaxies in the field, in cosmological hydrodynamics simulations. The simulations include detailed modeling of chemical enrichment by SNIa and SNII In our simulations the missing metal problem is caused by ...
D.G. Lambas, P. B. Tissera
openaire   +2 more sources

Baade's window and APOGEE. Metallicities, ages, and chemical abundances [PDF]

, 2017
Context. Baade's window (BW) is one of the most observed Galactic bulge fields in terms of chemical abundances. Owing to its low and homogeneous interstellar absorption it is considered the perfect calibration field for Galactic bulge studies. Aims.
M. Schultheis, Á. Rojas-Arriagada, A. P'erez, H. Jőnsson, M. Hayden, G. Nandakumar, K. Cunha, C. Prieto, J. Holtzman, T. Beers, D. Bizyaev, J. Brinkmann, R. Carrera, R. Cohen, D. Geisler, F. Hearty, J. G. Fern'andez-Trincado, C. Maraston, D. Minniti, C. Nitschelm, A. Roman-Lopes, D. Schneider, B. Tang, S. Villanova, G. Zasowski, S. Majewski   +25 more
semanticscholar   +1 more source

Chemical abundances in the nucleus of the Sagittarius dwarf spheroidal galaxy [PDF]

, 2017
We present Iron, Magnesium, Calcium, and Titanium abundances for 235 stars in the central region of the Sagittarius dwarf spheroidal galaxy (within 9.0 arcmin ~70 pc from the center) from medium-resolution Keck/DEIMOS spectra.
A. Mucciarelli, M. Bellazzini, R. Ibata, D. Romano, S. Chapman, L. Monaco   +5 more
semanticscholar   +1 more source

Abundances in the Galactic bulge: results from planetary nebulae and giant stars

, 2008
Our understanding of the chemical evolution of the Galactic bulge requires the determination of abundances in large samples of giant stars and planetary nebulae (PNe).
Barbuy, B., Chiappini, C., Gorny, S., Stasinska, G.   +3 more
core   +2 more sources

A Systematic NLTE Study of Very Metal-poor Stars with Metallicity down to −4.3 dex. I. Global Stellar Parameters Based on High-resolution Spectra

The Astrophysical Journal
Very metal-poor (VMP) stars provide a record of the chemical composition and dynamics of the early Galaxy. Based on the high-resolution and high signal-to-noise ratio spectra from the Subaru Telescope for 103 VMP stars, in this series of papers we ...
Jianrong Shi, Gang Zhao, Shuai Liu, Zeming Zhou, Haining Li, Hongliang Yan, Sofya Alexeeva, Huawei Zhang, Wako Aoki, Tadafumi Matsuno, Jingkun Zhao, Huiling Chen, Yufu Shen   +12 more
doaj   +1 more source

CHEMICAL ABUNDANCES IN BINARIES WITH TWIN COMPONENTS

Odessa Astronomical Publications, 2017
Procedure and some preliminary results of abundances determination in binaries with twin components from solar neighborhood are discussed. Numerical analysis were carried out by fits of synthetical spectra and COG to high resolution (R=50000) observed ...
Yu. Lyubchik, E. Martin, G. Basri, Ya. Pavlenko   +3 more
doaj   +1 more source

The Molecular Clouds in a Section of the Third Galactic Quadrant: Observational Properties and Chemical Abundance Ratio between CO and its Isotopologues

The Astronomical Journal, 2023
We compare the observational properties between ^12 CO, ^13 CO, and C ^18 O and summarize the observational parameters based on a 7069-cloud sample from the Milky Way Imaging Scroll Painting CO survey in a section of the third Galactic quadrant.
Chen Wang, Haoran Feng, Ji Yang, Xuepeng Chen, Yang Su, Qing-Zeng Yan, Fujun Du, Yuehui Ma, Jiajun Cai   +8 more
doaj   +1 more source