The temperatures of red supergiants in low-metallicity environments - Archive ouverte HAL
Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2021

The temperatures of red supergiants in low-metallicity environments

Résumé

The temperatures of red supergiants (RSGs) are expected to depend on metallicity (Z) in such a way that lower Z RSGs are warmer. In this work, we investigate the Z-dependence of the Hayashi limit by analysing RSGs in the low-Z galaxy WolfLundmark–Mellote, and compare with the RSGs in the higher Z environments of the Small Magellanic Cloud and Large Magellanic Cloud. We determine the effective temperature (T$_{eff}$) of each star by fitting their spectral energy distributions, as observed by VLT + SHOOTER, with MARCS model atmospheres. We find average temperatures of T$_{effWLM}$ = 4400 ± 202 K, T$_{effSMC}$ = 4130 ± 103 K, and T$_{effLMC}$ = 4140 ± 148 K. From population synthesis analysis, we find that although the Geneva evolutionary models reproduce this trend qualitatively, the RSGs in these models are systematically too cool. We speculate that our results can be explained by the inapplicability of the standard solar mixing length to RSGs
Fichier principal
Vignette du fichier
The%20temperatures%20of%20red%20supergiants%20in%20low-metallicity%20environments.pdf (11.51 Mo) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03686995 , version 1 (20-09-2024)

Identifiants

Citer

Gemma Gonzalez-Tora, Ben Davies, Rolf-Peter Kudritzki, Bertrand Plez. The temperatures of red supergiants in low-metallicity environments. Monthly Notices of the Royal Astronomical Society, 2021, 505 (3), pp.4422-4443. ⟨10.1093/mnras/stab1611⟩. ⟨hal-03686995⟩
17 Consultations
0 Téléchargements

Altmetric

Partager

More