Browsing by Author "Istrate, Alina G."
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Outliers : multicolour photometry guiding the search for evolved binary systems in the globular cluster 47Tucanae
Campos, Fabíola; Pelisoli, Ingrid Domingos; Kamann, Sebastian; Husser, Tim Oliver; Dreizler, Stefan; Bellini, Andrea; Robinson, E.L.; Nardiello, Domenico; Piotto, Giampaolo; Kepler, Souza Oliveira; Istrate, Alina G.; Winget, Donald Earl; Montgomery, Michael Houston; Dotter, Aaron Loveren (2018) [Journal article]We use Hubble Space Telescope multicolour photometry of the globular cluster 47 Tucanae to uncover a population of 24 objects with no previous classification that are outliers from the single-star model tracks in the ... -
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) [Journal article]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 ... -
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) [Journal article]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 ... -
The impact of the uncertainties in the 12C(α, γ ) 16O reaction rate on the evolution of low- to intermediate-mass stars
Pepper, Ben Thomas; Istrate, Alina G.; Romero, Alejandra Daniela; Kepler, Souza Oliveira (2022) [Journal article]One of the largest uncertainties in stellar evolutionary computations is the accuracy of the considered reaction rates. The 12C(α, γ ) 16O reaction is particularly important for the study of low- and intermediate-mass stars ... -
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 ...