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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 1.

The 5σ contrast curves for HD 220242 obtained from speckle imaging with NESSI in the 562 and 832 nm filters. The insets are the NESSI speckle images centered on HD 220242A in each filter. The gray dashed line indicates the location of the companion at the time of the observations, interior to where limits can be placed. However, we find no evidence of any other bright companions.

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