Periodic mass-loss episodes due to an oscillation mode with variable amplitude in the hot supergiant HD 50064 - Université Paris Cité
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2010

Periodic mass-loss episodes due to an oscillation mode with variable amplitude in the hot supergiant HD 50064

Résumé


Aims: We aim to interpret the photometric and spectroscopic variability of the luminous blue variable supergiant HD 50064 (V = 8.21).
Methods: CoRoT space photometry and follow-up high-resolution spectroscopy with a time base of 137 d and 169 d, respectively, was gathered, analysed, and interpreted using standard time series analysis and light curve modelling methods, as well as spectral line diagnostics.
Results: The space photometry reveals one period of 37 d, which undergoes a sudden amplitude change with a factor 1.6. The pulsation period is confirmed in the spectroscopy, which additionally reveals metal line radial velocity values differing by 30 km s-1 depending on the spectral line and on the epoch. We estimate Teff 13 500 K, log g 1.5 from the equivalent width of Si lines. The Balmer lines reveal that the star undergoes episodes of changing mass loss on a time scale similar to the changes in the photometric and spectroscopic variability, with an average value of log dot{M} ~= -5 (in M_&sun; yr-1). We tentatively interpret the 37 d period as the result of a strange mode oscillation.

Dates et versions

hal-03786399 , version 1 (23-09-2022)

Identifiants

Citer

Conny Aerts, K. Lefever, Annie Baglin, Pieter Degroote, Raquel Oreiro, et al.. Periodic mass-loss episodes due to an oscillation mode with variable amplitude in the hot supergiant HD 50064. Astronomy and Astrophysics - A&A, 2010, 513, pp.L11. ⟨10.1051/0004-6361/201014124⟩. ⟨hal-03786399⟩
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