A Second Candidate Magnetic Helium Core White Dwarf and 3 Other Variable White Dwarfs in the Globular Cluster NGC 6397

Using archival Hubble Space Telescope observations, we report the discovery of four variable low-mass white dwarfs (WDs; 0.18 M _⊙ ≤ M ≤ 0.5 M _⊙ ) in the globular cluster NGC 6397. One source exhibits a periodic optical modulation of 5.21 ± 0.02 hr, which we interpret as potentially due to the rota...

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मुख्य लेखकों:	Manuel Pichardo Marcano, Liliana E. Rivera Sandoval, Thomas J. Maccarone, Rene D. Rohrmann, Leandro G. Althaus, Craig O. Heinke, Diogo Belloni, Arash Bahramian
स्वरूप:	Artigo
भाषा:	Inglês
प्रकाशित:	IOP Publishing 2025-01-01
श्रृंखला:	The Astrophysical Journal
विषय:	White dwarf stars Globular star clusters Stellar magnetic fields
ऑनलाइन पहुंच:	https://doi.org/10.3847/1538-4357/ada144
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