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

Autor: Haucke, M., Cidale, L. S., Venero, R. O. J., Curé, M., Kraus, M., Kanaan, S., Arcos, C.

Publikováno v: Astronomy & Astrophysics, 06/2018, Volume 614, id.A91, 28 pp

Variable B supergiants (BSGs) constitute a heterogeneous group of stars with complex photometric and spectroscopic behaviours. They exhibit mass-loss variations and experience different types of oscillation modes, and there is growing evidence that v

Externí odkaz: http://arxiv.org/abs/1902.01341

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Spectro-interferometric observations of a sample of Be stars. Setting limits to the geometry and kinematics of stable Be disks

Autor: Cochetti, Y. R., Arcos, C., Kanaan, S., Meilland, A., Cidale, L. S., Curé, M.

Publikováno v: A&A 621, A123 (2019)

Be stars are rapid rotators surrounded by a gaseous disk envelope whose origin is still under debate. This envelope is responsible for observed emission lines and large infrared excess. To progress in the understanding of the physical processes invol

Externí odkaz: http://arxiv.org/abs/1811.11055

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Stellar parameters and H$\alpha$ line profile variability of Be stars in the BeSOS survey

Autor: Arcos, C., Kanaan, S., Chávez, J., Vanzi, L., Araya, I., Curé, M.

The Be phenomenon is present in about 20$\%$ of the B-type stars. Be stars show variability on a broad range of timescales, which in most cases is related to the presence of a circumstellar disk of variable size and structure. For this reason a time

Externí odkaz: http://arxiv.org/abs/1711.08675

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Evidence for Different Disk Mass Distributions Between Early and Late-Type Be Stars in the BeSOS Survey

Autor: Arcos, C., Jones, C. E., Sigut, T. A. A., Kanaan, S., Curé, M.

The circumstellar disk density distributions for a sample of 63 Be southern stars from the BeSOS survey were found by modelling their H$\alpha$ emission line profiles. These disk densities were used to compute disk masses and disk angular momenta for

Externí odkaz: http://arxiv.org/abs/1704.08133

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The yellow hypergiant HR 5171 A: Resolving a massive interacting binary in the common envelope phase

Publikováno v: A&A, 563, A71 (23p, 2014)

We initiated long-term optical interferometry monitoring of the diameters of unstable yellow hypergiants (YHG) with the goal of detecting both the long-term evolution of their radius and shorter term formation related to large mass-loss events. We ob

Externí odkaz: http://arxiv.org/abs/1401.2628

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Resolving the dusty circumstellar environment of the A[e] supergiant HD 62623 with the VLTI/MIDI

Autor: Meilland, A., Kanaan, S., Fernandes, M. Borges, Chesneau, O., Millour, F., Stee, Ph., Lopez, B.

B[e] stars are hot stars surrounded by circumstellar gas and dust responsible for the presence of emission lines and IR-excess in their spectra. How dust can be formed in this highly illuminated and diluted environment remains an open issue. HD 62623

Externí odkaz: http://arxiv.org/abs/0912.1954

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