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Showing 1 to 9 of 9 for “"open clusters"”.
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Old southern open clusters
… of four years spent in the investigation of old open clusters at the SAAO. Each chapter is a preprint of a paper which has been submitted or accepted for publication and is therefore an independent entity with its own list of acknowledgements and references. Since each chapter is intelligible …
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Open clusters and HII regions of our Galaxy
Open clusters are essential laboratories for understanding stellar evolution, as they allow constraints to be placed on stellar ages and luminosities. As distance indicators they are also important tracers of star formation in the Milky Way. One such cluster is Trumpler 27 that we identified for …
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Constraining Stellar Evolution in Young Open Clusters with NGTS
… our best explanations against observation, and open clusters act as key test sites for theories of stellar evolution. Observations of young open clusters enable theoretical models to be assessed at stages when stellar properties still reflect their initial conditions, and in regions of parameter …
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Chromospheric activity and lithium abundance in the NGC2516 and NGC3766 open clusters
… and lithium abundance of late type stars in open clusters of different ages. The study of open cluster is very important for our understanding of stellar evolution and atmospheres, since all cluster members have almost the same age and chemical composition and this allows to infer their …
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Development of an H-Alpha Index for the Detection of PMS Candidates in Young Open Clusters
… procedure is applied to several young open clusters. The development of the index and the results of its application to the clusters are presented. Also, an examination into how the results can be used to address some of the questions currently surrounding the PMS is included. Finally, …
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A Search for Low-Amplitude Variability Among Population I Main Sequence Stars
The detection of variable stars in open clusters is an essential component of testing stellar structure and evolution theories. The ability to detect low-amplitude variability among cluster members is directly related to the quality of the photometric results. Point Spread Function (PSF) fitting is …
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Open cluster groups and complexes
… agreed upon that stars typically form in open clusters and stellar associations, but little is known about the structure of the open cluster system. Do open clusters and stellar associations form isolated or do they prefer to form in groups and complexes? Open cluster groups and complexes …
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Kinematics and stellar populations of the galactic bulge.
… of 1.5, 1.7 and 1.7 kpc, and 33 globular and open clusters. We measure metallicities based on a calibration from stars belonging to the field and to clusters of known abundances. There is a clear dependence of the kinematics on metallicity in all the fields studied, in the sense that the more …
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Disentangling the chemodynamical history of the Milky Way disc with asteroseismology and spectroscopy
… precise ages for distant field red-giant stars, opening up a new window for Galactic archaeology. Another important aspect of this work is the forward-simulation approach that we pursued when interpreting these complex datasets and comparing them to chemodynamical models. The first part of the …