Tag: spettroscopia

Eight surveys for WEAVE. The paper: “The wide-field, multiplexed, spectroscopic facility WEAVE: Survey design, overview, and simulated implementation” of S. Jin (University of Oxford) appeared on MNRAS

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About thirteen years ago, in January 2010, the meeting “Science with the William Herschel Telescope 2010-2020” took place at the Isaac Newton Group of telescopes (ING). During that meeting, the importance of spectroscopic surveys at medium and high resolution for various strategic fields in both galactic and extragalactic astronomy was discussed. In the same year, a document endorsed by the

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A large catalog of stars associated with stellar clusters recently compiled in the framework of the Gaia-ESO Survey.

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Star clusters are a product of the star formation process. During their gravitational collapse, in fact, molecular clouds fragment forming hundreds or even thousands of stars. During the first few tens of million of years of their evolution, the young stars formed in a cloud are bound by the intense mutual gravitational attraction, forming a stellar cluster. Star clusters are important

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Age and chemistry of the giant stars. The study: “The Gaia-ESO survey: Calibrating a relationship between age and the [C/N] abundance ratio with open clusters” of G. Casali (INAF – Osservatorio Astrofisico di Arcetri) recently appeared on A&A

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Despite its importance for our comprehension of stellar and galactic evolution, stellar age is one of the most elusive stellar properties. In fact, we are able to determine stellar age with a good precision only in a few cases. Typical methods to determine this quantity are: the study of the chemical abundance of Lithium, stellar kinematics, stellar pulsations analyzed by

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A search for binary systems with GES. The study “The Gaia-ESO Survey: double, triple, and quadruple-line spectroscopic binary candidates” by T. Merle recently appeared on A&A

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The study of binary systems plays an important role in several fields of astronomy such as stellar evolution and galactic archeology since it allows direct measurements of stellar parameters such as masses, radii, and luminosities.   Multiple stellar systems have typically small angular separation and thus they are not resolved by direct imaging. In these cases spectroscopy is a powerful tool

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Marzo 2017, la ricerca in evidenza: la Gaia-ESO survey

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L’Osservatorio Astronomico di Palermo riveste un ruolo importante nella Gaia-ESO survey: un’ambiziosa survey spettroscopica pubblica che include osservazioni di più di 100000 stelle della Via Lattea, realizzate in più di 300 notti con lo spettrografo “Fibre Large Array Multi Element Spectrograph” (FLAMES) dell’European Southern Observatory.   Nei prossimi anni le osservazioni del telescopio Gaia dell’Agenzia Spaziale Europea rivoluzioneranno la nostra conoscenza della struttura

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