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Seminario DAS: RAMSES II - RAMan Search for Extragalactic Symbiotic Star: Project concept, commissioning, and early results from the science veri cation phase

Fecha

Jueves 16 de Mayo de 2019

Hora

12:15 hrs.

Lugar

Sala de Conferencias Federico Ristenpart (Camino El Observatorio 1515, Departamento de Astronomía, Edificio Central, piso 3, Las Condes, Santiago, Chile)

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Concepción gráfica de una estrella simbiótica.  Fuente: www.lunarplanner.com

Concepción gráfica de una estrella simbiótica. Fuente: www.lunarplanner.com

Enlaces relacionados
Departamento de Astronomía

Speaker: Rodolfo Angeloni
Instituto de Investigación Multidisciplinar en Ciencia y Tecnología, Universidad de La Serena

Title: RAMSES II - RAMan Search for Extragalactic Symbiotic Star: Project concept, commissioning, and early results from the science veri cation phase

Abstract: Symbiotic stars (SySts) are long-period interacting binaries composed of a hot compact star, an evolved giant star, and a tangled network of gas and dust nebulae. They represent unique laboratories for studying a variety of important astrophysical problems, and have also been proposed as possible progenitors of SNIa. Presently, we know 257 SySts in the Milky Way and 69 in external galaxies. However, these numbers are still in striking contrast with the predicted population of SySts in our Galaxy. Because of other astrophysical sources that mimic SySt colors, no photometric diagnostic tool has so far demonstrated the power to unambiguously identify a SySt, thus making the recourse to costly spectroscopic follow-up still inescapable. In this paper we present the concept, commissioning, and science veri cation phases, as well as the fi rst scienti c results, of RAMSES II - a Gemini Observatory Instrument Upgrade Project that has provided each GMOS instrument at both Gemini telescopes with a set of narrow-band filters centered on the Raman OVI 683 nm band. Continuum-subtracted images using these new filters clearly revealed known SySts with a range of Raman OVI line strengths, even in crowded fi elds. RAMSES II observations also produced the fi rst detection of Raman OVI emission from the SySt LMC 1 and confi rmed Hen 3-1768 as a new SySt - the fi rst photometric con firmation of a SySt. Via Raman OVI narrow-band imaging, RAMSES II thus provides the astronomical community with the first purely photometric tool for hunting SySts in the local Universe.


Rene A. Mendez
Seminar Coordinator
DAS/UChile - rmendez@uchile.cl

Organiza
Departamento de Astronomía, Cerro Calán
Contacto
Alejandro Leal Obreque - +562 29771154 -

Departamento de Astronomía

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http://uchile.cl/i153193
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