Navegação Ciências Exatas e da Terra por Autor "Uzundag, Murat"

Resultados 1-9 de 9

    • About the existence of warm H-rich pulsating white dwarfs 

      Althaus, Leandro Gabriel; Córsico, Alejandro Hugo; Uzundag, Murat; Vuckovic, Maja; Baran, Andrzej; Bell, Keaton; Camisassa, María E.; Calcaferro, Leila Magdalena; De Gerónimo, Francisco Cesar; Kepler, Souza Oliveira; Silvotti, Roberto (2020) [Artigo de periódico]
      Context. The possible existence of warm (Teff ∼ 19 000 K) pulsating DA white dwarf (WD) stars, hotter than ZZ Ceti stars, was predicted in theoretical studies more than 30 yr ago. These studies reported the occurrence of ...

    • 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) [Artigo de periódico]
      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 ...

    • Discovery of 74 new bright ZZ Ceti stars in the first three years of TESS 

      Romero, Alejandra Daniela; Kepler, Souza Oliveira; Hermes, James J.; Amaral, Larissa Antunes; Uzundag, Murat; Bognár, Zsófia; Bell, Keaton; Vanwyngarden, Madison; Baran, Andy; Pelisoli, Ingrid Domingos; Rosa, Gabriela Oliveira da; Koester, Detlev; Klippel, Theylor Schumacher; Fraga, Luciano; Bradley, Paul A.; Vuckovic, Maja; Heintz, Tyler M.; Reding, Joshua S.; Kaiser, B. C.; Charpinet, Stéphane (2022) [Artigo de periódico]
      We report the discovery of 74 new pulsating DA white dwarf stars, or ZZ Cetis, from the data obtained by the Transiting Exoplanet Survey Satellite mission, from Sectors 1 to 39, corresponding to the first 3 cycles. This ...

    • Kepler and TESS observations of PG 1159-035 

      Rosa, Gabriela Oliveira da; Kepler, Souza Oliveira; Córsico, Alejandro Hugo; Costa, Jose Eduardo da Silveira; Hermes, James J.; Kawaler, Steven D.; Bell, Keaton; Montgomery, Michael Houston; Provencal, Judith L.; Winget, Donald Earl; Handler, Gerald; Dunlap, Bart; Clemens, J. Christopher; Uzundag, Murat (2022) [Artigo de periódico]
      PG 1159-035 is the prototype of the PG 1159 hot (pre-)white dwarf pulsators. This important object was observed during the Kepler satellite K2 mission for 69 days in 59 s cadence mode and by the TESS satellite for 25 days ...

    • Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS : I. Asteroseismology of the GW Virstars RX J2117+3412, HS 2324+3944, NGC 6905, NGC 1501, NGC 2371, and K 1−16 

      Córsico, Alejandro Hugo; Uzundag, Murat; Kepler, Souza Oliveira; Althaus, Leandro Gabriel; Silvotti, Roberto; Baran, Andrzej; Vuckovic, Maja; Werner, Klaus; Bell, Keaton; Higgins, Michael (2021) [Artigo de periódico]
      Context. The recent arrival of continuous photometric observations of unprecedented quality from space missions has strongly promoted the study of pulsating stars and caused great interest in the stellar astrophysics ...

    • Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS : II. Discovery of two new GW Vir stars: TIC 333432673 and TIC 095332541 

      Uzundag, Murat; Córsico, Alejandro Hugo; Kepler, Souza Oliveira; Althaus, Leandro Gabriel; Werner, Klaus; Reindl, Nicole; Bell, Keaton; Higgins, Michael; Rosa, Gabriela Oliveira da; Vuckovic, Maja; Istrate, Alina G. (2021) [Artigo de periódico]
      Context. The Transiting Exoplanet Survey Satellite (TESS) mission is revolutionizing the blossoming area of asteroseismology, particularly of pulsating white dwarfs and pre-white dwarfs, thus continuing the impulse of its ...

    • Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS : III. Asteroseismology of the DBV star GD 358 

      Córsico, Alejandro Hugo; Uzundag, Murat; Kepler, Souza Oliveira; Silvotti, Roberto; Althaus, Leandro Gabriel; Koester, Detlev; Baran, Andrzej; Bell, Keaton; Bischoff-Kim, Agnès; Hermes, James J.; Kawaler, Steven D.; Provencal, Judith L.; Winget, Donald Earl; Montgomery, Michael Houston; Bradley, Paul A.; Kleinman, Scot James; Nitta, Atsuko (2022) [Artigo de periódico]
      Context. The collection of high-quality photometric data by space telescopes, such as the completed Kepler mission and the ongoing TESS program, is revolutionizing the area of white-dwarf asteroseismology. Among the different ...

    • Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS : IV. Discovery of two new GW Vir stars : TIC 0403800675 and TIC 1989122424 

      Uzundag, Murat; Córsico, Alejandro Hugo; Kepler, Souza Oliveira; Althaus, Leandro Gabriel; Werner, Klaus; Reindl, Nicole; Vuckovic, Maja (2022) [Artigo de periódico]
      We present two new GW Vir-type pulsating white dwarf stars, TIC 0403800675 (WD J115727.68-280349.64) and TIC 1989122424 (WD J211738.38-552801.18) discovered in the Transiting Exoplanet Survey Satellite (TESS) photometric ...

    • The bright blue side of the night sky : Spectroscopic survey of bright and hot (pre-) white dwarfs 

      Reindl, Nicole; Islami, Ramazan; Werner, Klaus; Kepler, Souza Oliveira; Pritzkuleit, Max; Dawson, Harry; Dorsch, Matti; Istrate, Alina G.; Pelisoli, Ingrid Domingos; Geier, Stephan; Uzundag, Murat; Provencal, Judith L.; Justham, Stephen (2023) [Artigo de periódico]
      We report on the spectroscopic confirmation of 68 new bright (G = 13.5–17.2 mag) and blue (pre-)white dwarfs (WDs). This finding has allowed us to almost double the number of the hottest (Teff ≥ 60 kK) known WDs brighter ...