Browsing Exact and Earth Sciences by Author "Ramos, Gabriel Lauffer"

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    • Asteroseismology of PG 1541 + 651 and BPM 31594 with TESS 

      Romero, Alejandra Daniela; Rosa, Gabriela Oliveira da; Kepler, Souza Oliveira; Bradley, Paul A.; Uzundag, Murat; Bell, Keaton; Hermes, James J.; Ramos, Gabriel Lauffer (2023) [Journal article]
      We present the photometric data from TESS for two known ZZ Ceti stars, PG 1541 + 651 and BPM 31594. Before TESS, both objects only had observations from short runs from ground-based facilities, with three and one period ...

    • Ground-based observation of ZZ Ceti stars and the discovery of four new variables 

      Romero, Alejandra Daniela; Amaral, Larissa Antunes; Klippel, Theylor Schumacher; Sanmartim, David; Fraga, Luciano; Ourique, Gustavo; Pelisoli, Ingrid Domingos; Ramos, Gabriel Lauffer; Kepler, Souza Oliveira; Koester, Detlev (2019) [Journal article]
      We perform ground-based photometric observations of 22 DA white dwarf stars, 10 already known ZZ Cetis and 12 candidates with atmospheric parameters inside the classical instability strip. We report on the discovery of ...

    • New full evolutionary sequences of H- and He-atmosphere massive white dwarf stars using MESA 

      Ramos, Gabriel Lauffer; Romero, Alejandra Daniela; Kepler, Souza Oliveira (2018) [Journal article]
      We explore the evolution of hydrogen-rich and hydrogen-deficient white dwarf stars with masses between 1.012 and 1.307M , and initial metallicity of Z = 0.02. These sequences are the result ofmain-sequence stars with masses ...

    • The white dwarf mass–radius relation and its dependence on the hydrogen envelope 

      Romero, Alejandra Daniela; Kepler, Souza Oliveira; Joyce, Simon R. G.; Ramos, Gabriel Lauffer; Córsico, Alejandro Hugo (2019) [Journal article]
      We present a study of the dependence of the mass–radius relation for DA white dwarf stars on the hydrogen envelope mass and the impact on the value of log g, and thus the determination of the stellar mass. We employ a set ...

    • Uncovering the chemical structure of the pulsating low-mass white dwarf SDSS J115219.99+024814.4 

      Romero, Alejandra Daniela; Ramos, Gabriel Lauffer; Istrate, Alina G.; Parsons, Steven (2022) [Journal article]
      Pulsating low-mass white dwarf (WD) stars are WDs with stellar masses between 0.30 and 0.45 M⊙ that show photometric variability due to gravity-mode pulsations. Within this mass range, they can harbour both a helium core ...