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Hipparcos, Gaia, and Radial Velocities Reveal that the Radio-emitting F Star HD 220242 Has an M Dwarf Companion, a Likely Source of the Radio Emission

  • Authors: Megan Delamer, Guđmundur Stefánsson, Suvrath Mahadevan, Caleb I. Cañas, Harish K. Vedantham, Arvind F. Gupta, Joseph R. Callingham, Juan Bautista Climent Oliver, William Cochran, Rachel B. Fernandes, Evan Fitzmaurice, Jose Carlos Guirado, Michael Hartmann, Artie P. Hatzes, Elise Koo, Jessica E. Libby-Roberts, Joe P. Ninan, Miguel Pérez- Torres, Paul Robertson, Arpita Roy, Christian Schwab

Megan Delamer et al 2026 The Astronomical Journal 171 .

  • Provider: AAS Journals

Caption: Figure 5.

The expected radio flux due to an interaction between the stellar wind of the primary and the magnetosphere of the secondary as a function of the strength of the dipolar component of the secondary’s magnetic field. Different line colors indicate different mass-loss rates from the primary (1, 10, and 100 ﹩{\dot{M}}_{\odot }﹩), and different line styles indicate the conversion efficiency from ram pressure to radio flux (10−5 and 10−3). The gray shaded region indicates where the emission caused by such an interaction is not consistent with the LOFAR observation.

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