Zobrazeno 1 - 10
of 97
pro vyhledávání: '"Yazan Momany"'
Autor:
Piero Dal Tio, Giada Pastorelli, Alessandro Mazzi, Michele Trabucchi, Guglielmo Costa, Alice Jacques, Adriano Pieres, Léo Girardi, Yang Chen, Knut A. G. Olsen, Mario Juric, Željko Ivezić, Peter Yoachim, William I. Clarkson, Paola Marigo, Thaise S. Rodrigues, Simone Zaggia, Mauro Barbieri, Yazan Momany, Alessandro Bressan, Robert Nikutta, Luiz Nicolaci da Costa
We describe a large simulation of the stars to be observed by the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). The simulation is based on the TRILEGAL code, which resorts to large databases of stellar evolutionary tracks, synthet
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e054aa0baecd3fe4bcc70ea5d45aa8b7
https://hdl.handle.net/11577/3466570
https://hdl.handle.net/11577/3466570
Autor:
Giampaolo Piotto, Yazan Momany, Ivo Saviane, Santi Cassisi, David Jones, Lorenzo Monaco, Simone Zaggia, Marco Gullieuszik, Peter B. Stetson, Valentina D'Orazi, M. Montalto, C. Moni Bidin, Yuri Beletsky, L. Girardi, H. M. J. Boffin, Elena Mason, H. Lala, Antonino Milone
Six decades and counting, the formation of hot ~20,000-30,000 K Extreme Horizontal Branch (EHB) stars in Galactic Globular Clusters remains one of the most elusive quests in stellar evolutionary theory. Here we report on two discoveries shattering th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c65d9ba62ccff5b86f487e83b6d0b096
http://hdl.handle.net/11577/3350231
http://hdl.handle.net/11577/3350231
Autor:
Angeles Pérez-Villegas, Santi Cassisi, Sergio Ortolani, Yazan Momany, Ivo Saviane, Eduardo Luiz Damiani Bica, Domenico Nardiello, Beatriz Barbuy, Stefano O. Souza, Enrico V. Held
Publikováno v:
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
The object ESO456-SC38 (Djorgovski 2) is one of the globular clusters that is closest to the Galactic center. It is on the blue horizontal branch and has a moderate metallicity of [Fe/H]~-1.0. It is thus similar to the very old inner bulge globular c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ec4e0034e617ae2b125bddc76821b6c6
http://hdl.handle.net/11577/3309994
http://hdl.handle.net/11577/3309994
Autor:
B. T. MacLean, Simon Campbell, John C. Lattanzio, Yazan Momany, P. L. Cottrell, Valentina D'Orazi, G. M. De Silva, Luca Casagrande
It has been well established that Galactic Globular clusters (GCs) harbour more than one stellar population, distinguishable by the anti-correlations of light element abundances (C-N, Na-O, and Mg-Al). These studies have been extended recently to the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b46b93cbe426bbcf7220d65a55d9a351
Autor:
Giampaolo Piotto, Yazan Momany, Nuno C. Santos, M. Montalto, D. Queloz, Silvano Desidera, Claudio Melo, Ivo Saviane, Luigi R. Bedin
The old and metal rich open cluster NGC 6253 was observed with the FLAMES multi-object spectrograph during an extensive radial velocity campaign monitoring 317 stars with a median of 15 epochs per object. All the targeted stars are located along the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7b597dacdb2697703d7b4fee106bfaaf
http://arxiv.org/abs/1601.02256
http://arxiv.org/abs/1601.02256
Autor:
B. T. MacLean, Simon Campbell, G. M. De Silva, Yazan Momany, John C. Lattanzio, Valentina D'Orazi, Jeffrey D. Simpson
Galactic Globular clusters (GCs) are now known to harbour multiple stellar populations, which are chemically distinct in many light element abundances. It is becoming increasingly clear that asymptotic giant branch (AGB) stars in GCs show different a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aebfa337667604780819bd2bce8af016
http://hdl.handle.net/20.500.12386/24347
http://hdl.handle.net/20.500.12386/24347
Autor:
Giampaolo Piotto, Alvio Renzini, Yazan Momany, Antonino Milone, Andrea Bellini, Anna F. Marino, Sandro Villanova, Luigi R. Bedin
Publikováno v:
Proceedings of the International Astronomical Union. 5:326-332
We present an abundance analysis based on high-resolution spectra of red-giant-branch (RGB) stars in the Galactic globular clusters NGC 6121 (M4) and NGC 6656 (M22). Our aim was to study their stellar population in the context of the multipopulation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6bc89f6f2e06dc0bb9eea5d4478c8871
https://doi.org/10.1017/s1743921309991219
https://doi.org/10.1017/s1743921309991219
Autor:
Julian Gonzalez, Fiorella Castelli, Martin Netopil, G. M. De Silva, Yazan Momany, S. Hubrig, S. Moehler
Publikováno v:
Astronomy & Astrophysics. 499:865-878
Large abundance anomalies have been previously detected in Horizontal Branch B-type stars. We present the first high resolution study of isotopic anomalies and chemical abundances in six Horizontal Branch B-type stars in globular clusters NGC6397 and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ef5e6d3889c18cc045b170d25c28c2bb
https://doi.org/10.1051/0004-6361/200911721
https://doi.org/10.1051/0004-6361/200911721
Publikováno v:
New Astronomy. 13:508-518
We derive fundamental parameters of the embedded cluster DBSB48 in the southern nebula Hoffleit18 and the very young open cluster Trumpler14, by means of deep JHKs infrared photometry. We build colour-magnitude and colour-colour diagrams to derive re
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a25ea1191e1d8b09eeffa228484d3196
https://doi.org/10.1016/j.newast.2008.01.008
https://doi.org/10.1016/j.newast.2008.01.008
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 388:1185-1197
We present a study of the evolved stellar populations in the dwarf spheroidal galaxy LeoII, based on JHKs observations obtained with the near-infrared array WFCAM at the UKIRT telescope. Combining the new data with optical data, we derived photometri
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c65df515ca703cbaba55f082ba1b4f57
https://doi.org/10.1111/j.1365-2966.2008.13400.x
https://doi.org/10.1111/j.1365-2966.2008.13400.x