Université Paris Diderot

Dec 20, 2024 | academic.oup.com | Université de Moncton |Observatoire de Paris |Université Paris Diderot

A group of horizontal-branch stars of particular interest for atomic diffusion (Michaud 1970) are blue horizontal-branch (BHB) stars. This group shows abundance anomalies for higher than 11 500 K (i.e. Glaspey et al. 1989; Behr et al. 1999; Moehler et al. 1999). Grundahl et al. (1999) studied several globular clusters and found that hot BHB stars reveal photometric jumps in the Hertzsprung–Russell (HR) diagram; Ferraro et al. (1998) reported that they also display photometric gaps.

Oct 26, 2024 | academic.oup.com | Université Paris Diderot

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Jun 5, 2024 | academic.oup.com | Université Paris Diderot

The currently accepted model of the Universe, known as the Lambda cold dark matter (ΛCDM) Cosmological Model, postulates that galaxies evolve through a process which is referred to as the ‘hierarchical merger model’, wherein the growth of the Universe’s highest mass galaxies is dominated by merging with lower mass galaxies (e.g. Lacey & Cole 1994; Cole et al. 2000; Robotham et al. 2014; Martin et al. 2018).

Jun 20, 2023 | cell.com | Gower Street |Tom Wyatt |Université Paris Diderot

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