A Second Candidate Magnetic Helium Core White Dwarf and 3 Other Variable White Dwarfs in the Globular Cluster NGC 6397
Date Issued
2025-02
Author(s) USM
Belloni, D.
DOI
10.3847/1538-4357/ada144
Abstract
Using archival Hubble Space Telescope observations, we report the discovery of four variable low-mass white dwarfs (WDs; 0.18 M circle dot <= M <= 0.5 M circle dot) in the globular cluster NGC 6397. One source exhibits a periodic optical modulation of 5.2
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