CFHT UM2025 - Presentation Details
Abstract Details
Title: Spectropolarimetric observation of chemically peculiar stars ESPaDOnS
Presenter: Viktor Khalack
Abstract:
An extensive spectral observation of chemically peculiar stars (ApBp, AmFm, HgMn, and δ Scuti) has been carried out with the spectropolarimeter ESPaDOnS at the Canada-France-Hawaii Telescope (CFHT) following the comprehensive study of the selected targets using the TESS data. For most of them the high-resolution (R=65000) and high signal to noise (SNR>500) Stokes I & V spectra have been acquired for different rotational phases. Use of the Least Square Deconvolution (LSD) method has resulted in detection of a significant mean longitudinal magnetic field Bz in ApBp stars including roAp targets. New Bz measurement are consistent with the published data on magnetic field but have much smaller error-bars. We have successfully measured Bz in the known magnetic δ Scuti, while in other selected δ Scuti the measured field is close to zero even if their photometric variability suggests that a significant field might be present. The derived spectra for AmFm and HgMn stars are well suited for the detailed abundance analysis.