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Fast rotating blue stragglers prefer loose clusters
Blue Stragglers Stars (BSSs) are anomalously luminous main sequence stars in clusters. Here, the authors show evidence that the fraction of fast rotating BSSs increases for decreasing central density of the host system, suggesting fast spinning BSSs prefer low-density environments.
- Francesco R. Ferraro
- , Alessio Mucciarelli
- & Mario Mateo
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Article
| Open Access
Evidence of structural discontinuities in the inner core of red-giant stars
Red giant stars enter the clump phase as the helium in the cores start fusing. Here, the authors show evidence for large core structural discontinuities in 7% of Kepler satellite clump star data implying that the mixing region beyond the convective core boundary has a radiative thermal stratification.
- Mathieu Vrard
- , Margarida S. Cunha
- & Benoît Mosser
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Article
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The imprint of star formation on stellar pulsations
The classical stellar evolution concept assumes that when the stars arrive on the main sequence, there is no traceable mark remains about their early evolutionary history. Here, the authors show that the accretion history leaves an imprint on the interior structure of the stars that are potentially detectable via asteroseismology.
- Thomas Steindl
- , Konstanze Zwintz
- & Eduard Vorobyov
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Article
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NGC1818 unveils the origin of the extended main-sequence turn-off in young Magellanic Clouds clusters
The nature of young star clusters in the Magellanic Clouds is debated. Here, the authors show an alternative approach that exploits data to exclude the presence of age differences greater than a few million years among cluster stars in a very young cluster.
- Giacomo Cordoni
- , Antonino P. Milone
- & Maria V. Legnardi
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Article
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Spectroscopic evidence for a large spot on the dimming Betelgeuse
The reason of the dimming of Betelgeuse is debated. Here, the authors show effective temperature decrease that can be explained by a large spot.
- Sofya Alexeeva
- , Gang Zhao
- & Shaoming Hu
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Article
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Measuring the ionisation fraction in a jet from a massive protostar
The ionisation fraction of protostellar jets is key to establish their true energetics. Here, the authors determine it in a jet from a high-mass young stellar object, using multi-wavelengths observations, confirming that the ionising mechanism giving rise to the radio emission originates from shocks.
- R. Fedriani
- , A. Caratti o Garatti
- & M. Hoare
Expanding the limits of nuclear stability at finite temperature