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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2021

The impact of winds on the spectral appearance of red supergiants

Ben Davies
  • Fonction : Auteur
Bertrand Plez
Laboratoire Univers et Particules de Montpellier

Résumé

ABSTRACT The rate at which mass is lost during the red supergiant (RSG) evolutionary stage may strongly influence how the star appears. Though there have been many studies discussing how RSGs appear in the mid- and far-infrared (IR) as a function of their mass-loss rate, to date, there have been no such investigations at optical and near-IR wavelengths. In a preliminary study, we construct model atmospheres for RSGs that include a wind, and use these models to compute synthetic spectra from the optical to the mid-IR. The inclusion of a wind has two important effects. First, higher mass-loss rates result in stronger absorption in the TiO bands, causing the star to appear as a later spectral type despite its effective temperature remaining constant. This explains the observed relation between spectral type, evolutionary stage, and mid-IR excess, as well as the mismatch between temperatures derived from the optical and IR. Secondly, the wind mimics many observed characteristics of a ‘MOLsphere’, potentially providing an explanation for the extended molecular zone inferred to exist around nearby RSGs. Thirdly, we show that wind fluctuations can explain the spectral variability of Betelgeuse during its recent dimming, without the need for dust.

Domaines

Astrophysique [astro-ph]

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https://hal.umontpellier.fr/hal-03854970

Soumis le : mercredi 16 novembre 2022-10:25:14

Dernière modification le : jeudi 11 avril 2024-13:18:12

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Dates et versions

hal-03854970 , version 1 (16-11-2022)

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Ben Davies, Bertrand Plez. The impact of winds on the spectral appearance of red supergiants. Monthly Notices of the Royal Astronomical Society, 2021, 508 (4), pp.5757-5765. ⟨10.1093/mnras/stab2645⟩. ⟨hal-03854970⟩

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