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The circumstellar environments of B[e] Supergiants
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SYSNO ASEP 0485384 Document Type C - Proceedings Paper (int. conf.) R&D Document Type The record was not marked in the RIV Title The circumstellar environments of B[e] Supergiants Author(s) Maravelias, Grigorios (ASU-R) ORCID
Kraus, Michaela (ASU-R) RID, ORCID
Cidale, L.S. (AR)
Arias, M.L. (AR)
Aret, Anna (ASU-R) ORCID
Borges Fernandes, M. (BR)Source Title The Lives and Death-Throes of Massive Star. - Cambridge : Cambridge University Press, 2017 - ISSN 1743-9213 - ISBN 9781107170063 Pages s. 421-421 Number of pages 1 s. Publication form Print - P Action Symposium of the International Astronomical Union /329./ Event date 28.11.2016 - 02.12.2016 VEvent location Auckland Country NZ - New Zealand Event type WRD Language eng - English Country GB - United Kingdom Keywords stars ; circumstellar matter ; emission-line Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics OECD category Astronomy (including astrophysics,space science) R&D Projects GA14-21373S GA ČR - Czech Science Foundation (CSF) Institutional support ASU-R - RVO:67985815 UT WOS 000455603400100 DOI 10.1017/S1743921317002605 Annotation The evolution of massive stars encompasses short-lived transition phases in which mass-loss is more enhanced and usually eruptive. A complex environment, combining atomic, molecular and dust regions, is formed around these stars. In particular, the circumstellar environment of B[e] Supergiants is not well understood. To address that, we have initiated a campaign to investigate their environments for a sample of Galactic and Magellanic Cloud sources. Using high-resolution optical and near-infrared spectra (MPG-ESO/FEROS, GEMINI/Phoenix and VLT/CRIRES, respectively), we examine a set of emission features ([OI], [CaII], CO bandheads) to trace the physical conditions and kinematics in their formation regions. We find that the B[e] Supergiants are surrounded by a series of rings of different temperatures and densities, a probable result of previous mass-loss events. In many cases the CO forms very close to the star, while we notice also an alternate mixing of densities and temperatures (which give rise to the different emission features) along the equatorial plane. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2018
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