Zobrazeno 1 - 6
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pro vyhledávání: '"L P R Vaz"'
We investigate stellar magnetic activity from the theoretical point of view, by using stellar evolution models to calculate theoretical convective turnover times ($\tau_{\rm c}$) and Rossby numbers (${\rm Ro}$) for pre-main-sequence and main-sequence
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9ae20c83be6ec4d315163ea6bdb2055c
http://arxiv.org/abs/2212.13958
http://arxiv.org/abs/2212.13958
Publikováno v:
Astronomy & Astrophysics. 377:898-910
Photometric observations of MT Ser, the central star of the planetary nebula Abell 41 are presented. The periodic modulations detected by Grauer & Bond (1983) are conrmed, thus rmly establishing the binary nature of MT Ser. The signicantly enlarged t
Theoretical estimates of the convective turnover time for low-mass, rotating pre-main sequence stars
Publikováno v:
Proceedings of the International Astronomical Union. 2:446-448
The Rossby number Ro is an important quantity related to the well-known magnetic activity-rotation correlation for main sequence, solar-type stars. For such stars, Ro can be obtained by a semi-empirical relationship between the convective turnover ti
Magnetic fields are at the heart of the observed stellar activity in late-type stars, and they are presumably generated by a dynamo mechanism at the interface layer between the radiative and the convective stellar regions. Since dynamo models are bas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ba0535586139a0333834f6f7747eed71
http://arxiv.org/abs/1001.2754
http://arxiv.org/abs/1001.2754
Rotational evolution in the pre-main sequence (PMS) is described with new sets of PMS evolutionary tracks including rotation, non-gray boundary conditions (BCs) and either low (LCE) or high convection efficiency (HCE). Using observational data and ou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5521e46b3086b2cb8b3eda3a0536fc9d
Publikováno v:
International Astronomical Union Colloquium. 137:371-373
Photometric and spectroscopic observations of V3903 Sgr are analyzed, and absolute dimensions (masses and radii) are determined to a precision better then 3%.