Casmir Obasi - Academia.edu (original) (raw)
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Universidade Federal do Rio Grande do Sul
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Papers by Casmir Obasi
Astronomy & Astrophysics, 2021
Context. Globular clusters (GCs) in the Milky Way (MW) bulge are very difficult to study because:... more Context. Globular clusters (GCs) in the Milky Way (MW) bulge are very difficult to study because: i) they suffer from the severe crowding and galactic extinction; which are characteristic of these inner Galactic regions ii) they are more prone to be affected by dynamical processes. Therefore, they are relatively faint and difficult to map. However, deep near-infrared photometry like that provided by the VISTA Variables in the Via Láctea Extended Survey (VVVX) is allowing us to map GCs in this crucial yet relatively uncharted region. Aims. Our main goals are to study the true nature of the GC candidates FSR 19 and FSR 25 and measure their physical parameters. Methods. We use the near-infrared (NIR) VVVX database, in combination with the Two Micron All Sky Survey (2MASS) and Gaia EDR3 proper motions (PMs) and photometry to study ages, metallicities, distances, reddening, mean PMs, sizes and integrated luminosities for FSR 19 and FSR 25. A robust combination of selection criteria allow...
Astronomy & Astrophysics, 2021
Context. Globular clusters (GCs) in the Milky Way (MW) bulge are very difficult to study because:... more Context. Globular clusters (GCs) in the Milky Way (MW) bulge are very difficult to study because: i) they suffer from the severe crowding and galactic extinction; which are characteristic of these inner Galactic regions ii) they are more prone to be affected by dynamical processes. Therefore, they are relatively faint and difficult to map. However, deep near-infrared photometry like that provided by the VISTA Variables in the Via Láctea Extended Survey (VVVX) is allowing us to map GCs in this crucial yet relatively uncharted region. Aims. Our main goals are to study the true nature of the GC candidates FSR 19 and FSR 25 and measure their physical parameters. Methods. We use the near-infrared (NIR) VVVX database, in combination with the Two Micron All Sky Survey (2MASS) and Gaia EDR3 proper motions (PMs) and photometry to study ages, metallicities, distances, reddening, mean PMs, sizes and integrated luminosities for FSR 19 and FSR 25. A robust combination of selection criteria allow...