Wind properties of variable B supergiants Evidence of pulsations connected with mass-loss episodes

0500773 - ASÚ 2019 RIV FR eng J - Journal Article
Haucke, M. - Cidale, L.S. - Venero, R.O.J. - Curé, M. - Kraus, Michaela - Kanaan, S. - Arcos, C.
Wind properties of variable B supergiants Evidence of pulsations connected with mass-loss episodes.
Astronomy & Astrophysics. Roč. 614, June (2018), č. článku A91. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA ČR(CZ) GA17-02337S
Grant - others:AV ČR(CZ) CONICET/14/003
Institutional support: RVO:67985815
Keywords : early-type stars * supergiants * mass-loss stars
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 6.209, year: 2018

To discuss the wind properties and variability of evolved B-type stars, we derive new stellar and wind parameters for a sample of 19 Galactic BSGs by fitting theoretical line profiles of H, He, and Si to the observed ones and compare them with previous determinations. Our results also suggest that radial pulsation modes with periods longer than 6 days might be responsible for the wind variability in the mid/late-type. These radial modes might be identified with strange modes, which are known to facilitate (enhanced) mass loss. On the other hand, we propose that the wind behaviour of stars on the cool side of the bi-stability jump could fit with predictions of the delta-slow hydrodynamics solution for radiation-driven winds with highly variable ionization.
Permanent Link: http://hdl.handle.net/11104/0292813