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Description
Astrospheres are bullet-shaped structures resulting from the relative motion through the interstellar medium and comprise of three distinct features: a termination shock, astropause, and a bow shock. This work investigates the astrosphere of λ Cephei. λ Cephei is a bright runaway star. Previous 3D magnetohydrodynamic (MHD) simulations by Baalmann et al. (2021) showed the position of the termination shock (TS), astropause (AP), and bow shock (BS) of λ Cephei. A comparison between the simulations by Baalmann et al. (2021) is done using the Pen et al. (2003) model work shows similar results. Due to the Pen et al. (2003) model excluding the radiative cooling process and also being solved on a Cartesian grid, the bow shock width is somewhat different compared to the Baalmann et al. (2021). Additionally, the study shows how variations in relative velocity and interstellar medium (ISM) magnetic field strength affect λ Cephei’s astrosphere. Decreasing relative velocity from 80 km/s to 40 km/s leads to an enlarged astrosphere, particularly evident in bow shock regions. Investigation of ISM magnetic field effects shows that increasing field strength alters the astrosphere’s structure, resulting in asymmetry under high ISM magnetic field conditions.
