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PreprintarXiv licencearXiv

The convective-transition gap in 47 Tucanae with JWST

  • M. Scalco
  • L. R. Bedin
  • M. Libralato
  • M. Griggio
  • E. Vesperini
  • R. Gerasimov
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Abstract

We report the detection of the convective-transition gap along the lower main sequence (MS) of the Galactic globular cluster (GC) 47 Tucanae using deep James Webb Space Telescope (JWST) observations. We analyse the stellar luminosity function (LF) in the vicinity of the gap location using two independent colour-magnitude diagrams (CMDs). In both cases, the LF is characterised by a narrow gap followed by a discontinuous increase in the stellar number counts, and presents an overall morphology qualitatively consistent with that reported in previous studies. By modelling the observed LFs with an empirical likelihood model, we estimate the statistical significance of the observed feature. Additional JWST passbands exhibit similar signatures, providing further evidence for the presence of a discontinuity.

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Cite

BibTeXRIS
BibTeX
@misc{scalco2026convectivetransition,
  title = {{The convective-transition gap in 47 Tucanae with JWST}},
  author = {M. Scalco and L. R. Bedin and M. Libralato and M. Griggio and E. Vesperini and R. Gerasimov},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.18998},
  eprint = {2610.18998},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.18998},
}
RIS
TY  - UNPB
TI  - The convective-transition gap in 47 Tucanae with JWST
AU  - M. Scalco
AU  - L. R. Bedin
AU  - M. Libralato
AU  - M. Griggio
AU  - E. Vesperini
AU  - R. Gerasimov
PY  - 2026
DA  - 2026/10/13
PB  - arXiv
DO  - 10.48550/arxiv.2610.18998
UR  - https://arxiv.org/abs/2610.18998
AB  - We report the detection of the convective-transition gap along the lower main sequence (MS) of the Galactic globular cluster (GC) 47 Tucanae using deep James Webb Space Telescope (JWST) observations. We analyse the stellar luminosity function (LF) in the vicinity of the gap location using two independent colour-magnitude diagrams (CMDs). In both cases, the LF is characterised by a narrow gap followed by a discontinuous increase in the stellar number counts, and presents an overall morphology qualitatively consistent with that reported in previous studies. By modelling the observed LFs with an empirical likelihood model, we estimate the statistical significance of the observed feature. Additional JWST passbands exhibit similar signatures, providing further evidence for the presence of a discontinuity.
ER  -