HD 251108 is an RS CVn binary whose photometric variations over 12 years are driven by a large spot that migrated from low latitudes toward the pole, with RV changes arising from both spot distortions and orbital motion of a ~1.3 solar-mass giant plus a possible 0.25 solar-mass companion.
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Nature of HD 251108: an RS CVn binary with a long-term evolving spot
HD 251108 is an RS CVn binary whose photometric variations over 12 years are driven by a large spot that migrated from low latitudes toward the pole, with RV changes arising from both spot distortions and orbital motion of a ~1.3 solar-mass giant plus a possible 0.25 solar-mass companion.