Thursday 30 de November
SALÓN AZUL
09:50 - 10:20
Plenary Target Talk
Invited Speaker:
Denise R. Gonçalves
- Observatório do Valongo, Universidade Federal do Rio de Janeiro
(Brasil)
[cv]
Denise R. Gonçalves
Observatório do Valongo, Universidade Federal do Rio de Janeiro
Curriculum Vitae:
Graduated in Physics from UFPR, she holds a master’s and doctorate in Astronomy from USP. As a postdoctoral fellow and visiting researcher, she conducted research at institutions such as: Instituto de Astrofísica de Canarias; University College London; ALMA Group of the National Astronomical Observatory of Japan. She is currently a member of the IAU as well as of the international surveys S-PLUS, J-PLUS and J-PAS, in which she coordinates projects for the discovery of new planetary and symbiotic nebulae. She is responsible for the Gemini RAMSES II project that counts symbiotic stars in dwarf galaxies. Since 2022, she holds the FAPERJ’s Thematic and Scientist of Our State prestigious grants. She is a CNPq productivity fellow and associate professor at the Valongo Observatory (UFRJ) – being responsible for the research group Photoionized Nebulae. Her work emphasizes the final phases of stellar evolution – planetary and symbiotic nebulae – and the chemical evolution of the local Universe.
Chair: Melina Bernsten
#472 |
HUNTRESS: HUnting plaNeTaRy nEbula and Symbiotic Stars
Denise R. Gonçalves
1
1 - Valongo Observatory - Federal University of Rio de Janeiro.
Abstract:
Planetary nebulae (PNe) and symbiotic stars (SySt) are fascinating objects related to the fate of the great majority of stars in any galaxy. PNe are bubbles of ionized gas, produced from low- and intermediate-mass stars towards their latest life stages. Approximately 3,500 PNe have been identified in the Milky Way, but only 14 in the Galactic halo. Halo PNe are relevant because they provide clues about the final evolution of old, low-mass stars and they are able to convey fundamental information of the early chemical conditions of the Galaxy, including its star formation history. SySt are binary systems formed by evolved stars: a cool giant star and a hot star (usually a white dwarf). Their crucial role in Astrophysics resides on the fact they allow the study of the mechanisms behind supersoft X-ray sources, thermonuclear outbursts, collimation of stellar winds and jets or the shaping of other nebulae, like of PNe. Moreover, being binary systems that contain at least one degenerated star, SySt are also possible progenitors of Type Ia supernovae, key for the cosmological distance scale. Living in an era of gigantic multi-band optical photometric surveys, as VPHAS+, J-PLUS, S-PLUS and the forthcoming J-PAS, our group is member of the last three of these projects, and each of them will map ~8,000$^2$ of either the north (J-PLUS and J-PAS) or the south (S-PLUS) sky. Adding to these surveys, RAMSES II is an international Gemini project to map the Local Group dwarf galaxies using an emission-line that is unique to identify SySt. We take advantage of these projects to comprise a big effort aimed at discovering PNe and SySt based on VPHAS+, J-PLUS, S-PLUS, J-PAS and RAMSES II. This talk will discuss the results so far obtained from this enterprise.
