The Yellow Hypergiant - B[e] Supergiant Connection

0482486 - ASÚ 2018 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Aret, A. - Kraus, Michaela - Kolka, I. - Maravelias, Grigorios
The Yellow Hypergiant - B[e] Supergiant Connection.
Stars: From Collapse to Collapse. San Francisco: Astronomical Society of the Pacific, 2017, s. 162-165. ASP Conference Series, 510. ISBN 9781583819043.
[Stars: From Collapse to Collapse. Nizhny Arkhyz (RU), 03.10.2016-07.10.2016]
Grant CEP: GA ČR(CZ) GA14-21373S
Institucionální podpora: RVO:67985815
Klíčová slova: stars * supergiants * circumstellar environments
Obor OECD: Astronomy (including astrophysics,space science)

B[e] supergiants and yellow hypergiants share a number of common properties regarding their circumstellar environments. Using the forbidden [OI] and[Ca II] lines as disk tracers, we suggest the presence of a Keplerian disk or ring around the yellow hypergiant V509 Cas and confirm the pole-on inner disk around V1302 Aql. These findings indicate a change in mass-loss behavior from spherical in cooler yellow hypergiants to axisymmetric in the hotter ones during the passage through the Yellow Void. The accumulation of material in the equatorial plane reminds of the disks of B[e] supergiants, supporting the suggestion that yellow hypergiants might appear as B[e] supergiants after they reach the blue edge of the yellow instability domain.
Trvalý link: http://hdl.handle.net/11104/0277918