Seminario CAPA. "Spectral evolution of white dwarfs with J-PLUS".- Jueves 10 de marzo
Disculpen hay un error; la conferencia se impartirá en el Seminario de Física Nuclear y no en el de Física Teórica.
El jueves 10 de marzo a las 12.00 h tendrá lugar la conferencia, dentro del Seminario CAPA, que impartirá Carlos López Sanjuan (Investigador del Centro de Estudios de Física del Cosmos de Aragón). Se titula “Spectral evolution of white dwarfs with J-PLUS”.
Esta conferencia, dirigida a los estudiantes del Máster Universitario en Física del Universo: Cosmología, Astrofísica, Partículas y Astropartículas, está abierta a cualquier persona interesada. Tendrá lugar en el Seminario de Física Nuclear (Edificio A, Física) a las 12.00 h y podréis seguirla también online a través del código QR del cartel.
Abstract
White dwarfs are the degenerate compact remnants of stars with masses below 8 Msun. They do not have an internal source of energy and just cool down with time. In addition, they show a diversity of atmospheric compositions in their spectra, with sources presenting hydrogen (H) lines (DA type), helium (He) lines (DO and DB type), metal lines (DZ type), and featureless spectra (DC type) among others. In this seminar we present our recent work about the spectral evolution of white dwarfs with effective temperature (i.e., their age) using the Javalambre Photometric Local Universe Survey (J-PLUS). We analysed 5926 white dwarfs with r <= 19.5 mag in common between the white dwarf catalogue presented in Gentile Fusillo et al. 2021, defined from Gaia EDR3, and J-PLUS DR2. We estimated their effective temperature (Teff), surface gravity, parallax, and spectral type; and the probability of having a H-dominated atmosphere (p_H) for each source. Our analysis yields a 21 +- 3% increase in the fraction of He-dominated white dwarfs from Teff = 20000 K to Teff = 5000 K.
