Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Battich Tiara"'
Autor:
Schindewolf Markus, Németh Peter, Heber Ulrich, Battich Tiara, Bertolami Marcelo M. Miller, Latour Marilyn
Publikováno v:
Open Astronomy, Vol 27, Iss 1, Pp 27-34 (2018)
The chemical composition of helium-rich hot subluminous O stars plays an important role to understand and model their formation history. We present a spectroscopic analysis of four He-sdO stars,CD-31° 4800, [CW83] 0904- 02, LSS 1274 and LS IV +10°
Externí odkaz:
https://doaj.org/article/0089a23068ae4c538856cf26d30cfcd0
Publikováno v:
Open Astronomy, Vol 26, Iss 1, Pp 152-159 (2017)
The ε mechanism is a self-excitation mechanism of stellar pulsations which acts in regions where nuclear burning takes place. It has been shown that the ε mechanism can excite pulsations in hot pre-horizontal branch stars before they settle into th
Externí odkaz:
https://doaj.org/article/eaf18aad23c645ff80d2c77c5ea2f31c
We present evolutionary pathways for creating hot subdwarf OB (sdOB) stars from hierarchical triple configurations. We use the population synthesis code Multiple Stellar Evolution (MSE) to follow the stellar, binary, and gravitational dynamical evolu
Externí odkaz:
http://arxiv.org/abs/2209.11327
Publikováno v:
EPJ Web of Conferences, Vol 152, p 06010 (2017)
The ϵ mechanism is a self-excitation mechanism of pulsations which acts on the regions where nuclear burning takes place. It has been shown that the ϵ mechanism can excite pulsations in models of hot helium-core flash, and that the pulsations of LS
Externí odkaz:
https://doaj.org/article/509ca8588415436685c144a457df7c7f
Autor:
Bertolami, Marcelo M. Miller, Battich, Tiara, Córsico, Alejandro H., Althaus, Leandro G., Wachlin, Felipe C.
Recently a new class of hot subluminous stars strongly enriched in C and O have been discovered (CO-sdOs). These stars show abundances very similar to those observed in PG1159 stars but at lower temperatures. Moreover, it has been recently suggested
Externí odkaz:
http://arxiv.org/abs/2202.05635
Autor:
Bertolami, Marcelo M. Miller, Battich, Tiara, Corsico, Alejandro H., Christensen-Dalsgaard, Joergen, Althaus, Leandro G.
Publikováno v:
Nat Astron 4, 67-71 (2020)
All evolved stars with masses $M_\star\lesssim 2M_\odot$ undergo a helium(He)-core flash at the end of their first stage as a giant star. Although theoretically predicted more than 50 years ago, this core-flash phase has yet to be observationally pro
Externí odkaz:
http://arxiv.org/abs/2005.02070
Publikováno v:
A&A 638, A30 (2020)
Two of the possibilities for the formation of low-mass ($M_{\star}\lesssim 0.5\,M_{\odot}$) hydrogen-deficient white dwarfs are the occurrence of a very-late thermal pulse after the asymptotic giant-branch phase or a late helium-flash onset in an alm
Externí odkaz:
http://arxiv.org/abs/2003.13602
On the recent parametric determination of an asteroseismological model for the DBV star KIC 08626021
Autor:
De Gerónimo, Francisco C., Battich, Tiara, Bertolami, Marcelo M. Miller, Althaus, Leandro G., Córsico, Alejandro H.
Publikováno v:
A&A 630, A100 (2019)
Asteroseismology of white dwarf (WD) stars is a powerful tool that allows to reveal the hidden chemical structure of WD and infer details about their evolution by comparing the observed periods with those obtained from stellar models. A recent astero
Externí odkaz:
http://arxiv.org/abs/1908.08449
Autor:
Schindewolf, Markus, Nemeth, Peter, Heber, Ulrich, Battich, Tiara, Bertolami, Marcello Miller, Irrgang, Andreas, Latour, Marilyn
Hot subdwarfs represent a poorly understood late phase of stellar evolution. While binary evolution plays an important role for B-subdwarfs (sdB), the origin of the He dominated O-subdwarfs (He-sdO) is unknown. We search for chemical signatures of th
Externí odkaz:
http://arxiv.org/abs/1810.08082
Publikováno v:
A&A 614, A136 (2018)
The $\epsilon$ mechanism is a self-excitation mechanism of stellar pulsations which acts in regions inside the star where nuclear burning takes place. It has been shown that the $\epsilon$ mechanism can excite pulsations in models of hot pre-horizont
Externí odkaz:
http://arxiv.org/abs/1801.07287