Results 21 to 30 of about 250,517 (293)

Clustering in the stellar abundance space [PDF]

Monthly Notices of the Royal Astronomical Society, 2017
15 pages, 13 figures, accepted by MNRAS, author scientific names were ...
Boesso, R., Rocha-Pinto, H. J.
openaire   +2 more sources

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

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

Robust Data-driven Metallicities for 175 Million Stars from Gaia XP Spectra

The Astrophysical Journal Supplement Series, 2023
We derive and publish data-driven estimates of stellar metallicity [M/H] for ∼175 million stars with low-resolution XP spectra published in Gaia DR3.
René Andrae, Hans-Walter Rix, Vedant Chandra   +2 more
doaj   +1 more source

Intriguing Revelations from Lithium, Beryllium, and Boron

The Astrophysical Journal, 2023
This is a report on some highlights of research on the rare light elements, lithium (Li), beryllium (Be), and boron (B), that were presented at my Henry Norris Russell Lecture in 2020 January.
Ann Merchant Boesgaard
doaj   +1 more source

Stellar Abundances in Local Group Galaxies [PDF]

Highlights of Astronomy, 2005
AbstractHere we describe some of our latest results from measuring detailed abundances in Local Group dwarf galaxies with the VLT. Combining spectroscopic abundances with Color-Magnitude diagrams allows the effective measurement of detailed chemical evolution with time in these galaxies.
Tolstoy, Eline, Venn, Kim
openaire   +2 more sources

The Missing Link: Testing Galactic Chemical Evolution Models with the First Multi-isotopic Abundances in Solar Twin Stars

The Astrophysical Journal, 2023
We present the first isotopic abundances of both ^13 CO and C ^18 O in solar twin stars and test the results against several galactic chemical evolution (GCE) models with different nucleosynthesis prescriptions.
David R. Coria, Ian J. M. Crossfield, Joshua Lothringer, Becky Flores, Nikos Prantzos, Richard Freedman   +5 more
doaj   +1 more source

Constraining planet structure from stellar chemistry : the cases of CoRoT-7, Kepler-10, and Kepler-93 [PDF]

, 2015
This work was supported by Fundação para a Ciência e a Tecnologia (FCT) through the research grant UID/FIS/04434/2013. P.F., N.C.S., and S.G.S. also acknowledge support from FCT through Investigador FCT contracts of reference IF/01037/2013, IF/00169/2012,
Mortier, Annelies, A. Mortier, Dorn, Caroline, Sousa, S. G., Santos, N. C., Delgado-Mena, E., Benz, Willy, Mordasini, Christoph, Pepe, F., Mortier, A.; id_orcid, Mortier, A., F. Pepe, Figueira, P., Adibekyan, V., Udry, S., C. Mordasini, A. Santerne, Santerne, A., W. Benz, Dorn, C., V. Adibekyan, E. Delgado-Mena, Buchhave, L., S. G. Sousa, Mordasini, C., S. Udry, N. C. Santos, Buchhave, Lars A., Benz, W., P. Figueira, L. Buchhave, C. Dorn   +31 more
core   +3 more sources

Uncertainties in Stellar Abundance Analyses [PDF]

Highlights of Astronomy, 2005
AbstractOver the last half-century quantitative stellar spectroscopy has made great progress. However, most stellar abundance analyses today still employ rather simplified models, which can introduce severe systematic errors swamping the observational errors.
openaire   +2 more sources

Forming super-Mercuries: Role of stellar abundances

Astronomy & Astrophysics, 2023
Rocky exoplanets with bulk iron mass fraction of more than 60%, known as super-Mercuries, appear to be preferentially hosted by stars with higher iron mass fraction than that of the Sun. It is unclear whether these iron-rich planets can form in the disc or whether giant impacts are necessary for their formation.
Mah, Jingyi, Bitsch, Bertram
openaire   +3 more sources