Seminars and Colloquia at ESO/Santiago

For ESO and ESO-related Conferences and Workshops in Europe and Chile please check the main Conferences and Workshops page.


Broadcast of the ESO talks is available upon request.  If anyone is interested, kindly contact us via email
at least 60 min prior  to the beginning of the talk.


July 2015

7.07.15 (Tuesday)
12:00
"Massive-star magnetospheres in the NIR"
Mary OKSALA (LESIA, Observatoire de Paris)
Abstract
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"Massive-star magnetospheres in the NIR"

Mary OKSALA (LESIA, Observatoire de Paris)

Abstract

Magnetospheres of massive stars are known to exhibit variable emission signatures in the Hydrogen recombination lines in spectroscopy in optical wavelengths (i.e. the Balmer series). These features have been used to study both the mass content and the structure of the magnetosphere. This work aims to broaden our knowledge of these circumstellar environments into the near-infrared. We explore the line profiles produced in the Brackett series as a possible magnetic diagnostic, examining their shapes and variability. Infrared is fast becoming the next frontier, and this study represents a first step in utilizing the benefits of longer wavelengths over UV and optical.

14.07.15 (Tuesday)
12:00
"Spurious and real iron spreads in globular clusters"
Alessio MUCCIARELLI (Universita' degli Studi di Bologna, Italy)
Abstract
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"Spurious and real iron spreads in globular clusters"

Alessio MUCCIARELLI (Universita' degli Studi di Bologna, Italy)

Abstract

For several decades, globular clusters have been considered the best example of simple stellar populations, hosting coeval and chemical homogeneous stars. In particular, the striking homogeneity in terms of iron abundance is usually considered as the main chemical signature of globular clusters. In the last years, deep and extensive spectroscopic investigations have revealed a more complex picture, with the discovery of some massive clusters harboring intrinsic iron spread (like the extreme cases of Omega Centauri and Terzan 5). In this talk I will review the main evidence collected so far for "anomalous" clusters with intrisic iron spreads and I will discuss some effects able to mimic spurious metallicity spreads in some "peculiar" globular clusters like NGC3201 and M22.


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