HD 63401 is one of the magnetic chemically peculiar (mCP) stars that were recently observed by the space telescope TESS. The variability of photometric data, effective temperature, and magnetic field with the period were studied. HD 63401 may possess a hydrodynamically stable stellar atmosphere where atomic diffusion in combination with a magnetic field can lead to vertical stratification of elements abundances. The modified ZEEMAN2 code was employed to carry out an abundance analysis of high-resolution and high signal-to-noise spectra obtained for HD 63401 with ESPaDOnS. We found that iron shows clear evidence of vertical abundance stratification in the stellar atmosphere of HD 63401.

{"references": ["Bagnulo, S., et al. 2006, A&A, 450, 777", "Bailey, J. D., Landstreet, J. D. & Bagnulo, S. 2014, A&A, 561, A147", "Donati, J. F., et al. 1997, MNRAS, 291, 658", "Grevesse, N. , et al. 2015, A&A, 573, A27", "Hauschildt, P. H., et al. 1997, ApJ, 490, 803", "Hubrig, S., et al. 2006, AN, 327, 289", "Kashko, P., et al. 2020, Proceedings of the Polish Astronomical Society, 11, 209", "Khalack, V. 2018, MNRAS, 477, 882", "Kochukhov, O. & Bagnulo, S. 2006, A&A, 450, 763", "Landstreet, J. D. 1988, ApJ, 326, 967", "Marquardt, D. W. 1963, SIAM Journal on Applied Mathematics, 11, 431", "Napiwotzki, R., et al. 2004, ASPC, 318, 402"]}