The Ultramassive White Dwarfs of the Alpha Persei Cluster
| Autor: | David R. Miller, Ilaria Caiazzo, Jeremy Heyl, Harvey B. Richer, Pier-Emmanuel Tremblay |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Astrophysics - Solar and Stellar Astrophysics
Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) FOS: Physical sciences Astrophysics::Solar and Stellar Astrophysics Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics::Earth and Planetary Astrophysics Astrophysics - Astrophysics of Galaxies Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics QB |
| ISSN: | 2041-8205 |
| Popis: | We searched through the entire Gaia EDR3 candidate white dwarf catalogue for stars with proper motions and positions that are consistent with the stars having escaped from the Alpha Persei cluster within the past 81~Myr, the age of the cluster. In this search we found five candidate white dwarf escapees from Alpha Persei and obtained spectra for all five. We confirm that three are massive white dwarfs sufficiently young to have originated in the cluster. All three are more massive than any white dwarf previously associated with a cluster using Gaia astrometry, and possess some of the most massive progenitors. In particular, the white dwarf Gaia~EDR3~4395978097863572, which lies within 25~pc of the cluster centre, has a mass of about 1.20 solar masses and evolved from an 8.5 solar-mass star, pushing the upper limit for white dwarf formation from a single massive star, while still leaving a substantial gap between the resulting white dwarf mass and the Chandrasekhar mass. 9 pages, 3 figures. Minor changes in this version |
| Databáze: | OpenAIRE |
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