CAOSP abstracts, Volume: 49, No.: 2, year: 2019

Author(s): Shagatova, N.; Skopal, A.; Sekeráš, M.; Teyssier, F.; Shugarov, S.Yu.; Komžík, R.; Garai, Z.; Kundra, E.; Vaňko, M.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 49, no. 2, p. 406-410.
Date: 5/2019
Title: Hα orbital variations of the symbiotic star EG And from optical spectroscopy
Keyword(s): symbiotic binary stars, stellar spectral lines, stellar mass loss
Pages: 406 -- 410
License: This work is licensed under a Creative Commons Attribution 4.0 International License

Abstract: In this contribution, we explore the orbital variability of the Hα-line emission and absorption components of the symbiotic system EG And.

We have found that the equivalent width of the core emission is the largest at the orbital phase φ ≈ 0.4 and the smallest at φ ≈ 0.2. This probably reflects an asymmetric distribution of the cool giant wind at the orbital-plane area. Furthermore, the core emission equivalent width has a secondary maximum at φ ≈ 0.1. The strongest absorption in the profile is measured around the inferior conjunction of the white dwarf, φ &approx 0.4. This suggests that the ionized region is partially optically thick in the Hα line.