Search

Natural radioactivity in soil, rock, building materials, and water is very important for the radiological protection point of view. Radon is one of the carcinogenic radioactive gases. Radon causes ...

We present results of the large-scale magnetic topology and photospheric brightness distribution of the young star DK Tau using data from ESPaDOnS, a spectropolarimeter at the CFHT. We analyzed 18 spectra collected in 2010 and 2012, each set spanning over one rotation cycle. When using the literature's value of 21° for the inclination (of DK Tau's rotation axis), based on the inclination of the outer disk, we find several inconsistencies. Using the star's rotational properties, we derive an inclination of the stellar rotation axis of 51° and used this value for the magnetic mapping. We find that DK Tau’s rotation axis is likely to be misaligned compared to its outer disk axis by 30°., {"references":["Donati, J. F., Semel, M., Carter, B. D., Rees, D. E., & Collier Cameron, A. 1997, MNRAS, 291, 658","Donati, J. F. & Brown, S. F. 1997, A&A, 326, 1135","Folsom, C. P., Bouvier, J., Petit, P., et al. 2018, MNRAS, 474, 4956","Rota et al. submitted to A&A","Roggero, N., Bouvier, J., Rebull, L. M., & Cody, A. M. 2021, A&A, 651, A44"]}

We analyzed nine circularly polarized spectra of DK Tau (a classical T Tauri star), spanning over one rotation cycle and collected in 2010 with the spectropolarimeter ESPaDOnS (at the CFHT). We present a preliminary study of DK Tau's large-scale magnetic field configuration and the distribution of relative brightness across its surface, as well as the variability of its veiling (a signature of accretion). We find that the magnetic dipole is nearly perpendicular to the stellar rotation axis. We also find an anti-correlation of the veiling and the average magnetic field in the line-of-sight, Blos, showing the connection between the accretion and the magnetic field.

Sexual minorities are a group whose sexual identity, orientation or practices differ from the majority of the surrounding society. Usually, Sexual minorities comprise of lesbian, gay, bisexual and transgender individuals. Male-female dichotomy in hetero-normative societies has created havoc in the life of sexual minorities thus obscuring the fact that they are also human beings. The intent here is to bring to light the violation of basic human rights of this community and need for provision of equal opportunities and protection of rights like any other law abiding citizen.

Corporate governance is the set of arrangements through which organizations account to their stakeholders. Corporate governance and development are strongly related. Research has consistently shown that sound corporate governance supports economic development by promoting the efficient use of resources and by creating conditions that attract both domestic and foreign investment. Just as good corporate governance contributes to the sustainable development prospects of countries, increased economic sustainability of nations and institutional reforms that come with it provide the necessary basis for improved governance in the public and private sector. Alternatively, corporate governance failures can undermine development efforts by misallocating much needed capital and resources and developmental fallbacks can reinforce weak governance in the private sector and undermine job and wealth creation.

We analyzed nine circularly polarized spectra of DK Tau (a classical T Tauri star), spanning over one rotation cycle and collected in 2010 with the spectropolarimeter ESPaDOnS (at the CFHT). We present a preliminary study of DK Tau's large-scale magnetic field configuration and the distribution of relative brightness across its surface, as well as the variability of its veiling (a signature of accretion). We find that the magnetic dipole is nearly perpendicular to the stellar rotation axis. We also find an anti-correlation of the veiling and the average magnetic field in the line-of-sight, Blos, showing the connection between the accretion and the magnetic field., {"references":["Donati, J. -F. et al. (1997). Spectropolarimetric observations of active stars.","Donati, J. -F. et al. (1997). Zeeman-Doppler imaging of active stars. V. Sensitivity of maximum entropy magnetic maps to field orientation.","Folsom, C. P. et al. (2018). The evolution of surface magnetic fields in young solar-type stars II: the early main sequence (250-650 Myr).","Manara, C. F. et al. (2019). Observational constraints on dust disk sizes in tidally truncated protoplanetary disks in multiple systems in the Taurus region."]}