Zobrazeno 1 - 10
of 205
pro vyhledávání: '"Cidale, L."'
Autor:
Aidelman, Y. J., Fernandes, M. Borges, Cidale, L. S., Castelli, A. Smith, Arias, M. L., Zorec, J., Kraus, M., Torres, A., Souza, T. B., Cochetti, Y. R.
Publikováno v:
A&A 678, A21 (2023)
Context. Stars in transition phases, like those showing the B[e] phenomenon and luminous blue variables (LBVs), undergo strong, often irregular mass ejection events. The prediction of these phases in stellar evolution models is therefore extremely di
Externí odkaz:
http://arxiv.org/abs/2307.11576
Publikováno v:
A&A 665, A115 (2022)
It is already accepted that Be stars are surrounded by circumstellar envelopes, which are mostly compatible with a disc geometry in Keplerian rotation. We aim to obtain a more complete characterisation of the properties of the circumstellar environme
Externí odkaz:
http://arxiv.org/abs/2206.03819
B[e] stars are massive B type emission line stars in different evolutionary stages ranging from pre-main sequence to post-main sequence. Due to their mass loss and ejection events these objects deposit huge amounts of mass and energy into their envir
Externí odkaz:
http://arxiv.org/abs/2203.00963
Autor:
Araya, I., Christen, A., Curé, M., Cidale, L. S., Venero, R. O. J., Arcos, C., Gormaz-Matamala, A. C., Haucke, M., Escárate, P., Clavería, H.
Accurate mass-loss rates and terminal velocities from massive stars winds are essential to obtain synthetic spectra from radiative transfer calculations and to determine the evolutionary path of massive stars. From a theoretical point of view, analyt
Externí odkaz:
http://arxiv.org/abs/2104.03263
Autor:
Cochetti, Y. R., Arias, M. L., Kraus, M., Cidale, L. S., Torres, A. F., Granada, A., Maryeva, O. V.
In the group of B stars with spectroscopic peculiarities, we can find the Be and the B[e] stars. The Be stars are early-type rapid rotators that present, as their principal characteristic, emission lines of hydrogen and singly ionized metals due to t
Externí odkaz:
http://arxiv.org/abs/2103.01699
Autor:
Cochetti, Y. R., Zorec, J., Cidale, L. S., Arias, M. L., Aidelman, Y., Torres, A. F., Frémat, Y., Granada, A.
Publikováno v:
A&A 634, A18 (2020)
A significant number of Be stars show a second Balmer discontinuity (sBD) attributed to an extended circumstellar envelope (CE). The fast rotational velocity of Be stars undoubtedly plays a significant role in the formation of the CE. However, Bn sta
Externí odkaz:
http://arxiv.org/abs/1912.12994
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
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
The advanced stages of several high-mass stars are characterized by episodic mass loss shed during phases of instability. Key for assigning these stars a proper evolutionary state is to assess the composition and geometry of their ejecta alongside th
Externí odkaz:
http://arxiv.org/abs/1808.00008
Publikováno v:
A&A 610, A30 (2018)
Context. Stellar physical properties of star clusters are poorly known. Aims. Our goals are to perform a spectrophotometric study of the B star population in open clusters to derive accurate stellar parameters, search for the presence of circumstella
Externí odkaz:
http://arxiv.org/abs/1711.01311