{"knowledge_schema": {"broad_category": "Astronomy \u2192 Stellar Observation \u2192 Spectroscopy", "refinement": "This problem involves identifying stars that can be observed with two different spectrographs based on their apparent magnitudes.", "specific_scope": "The focus is on comparing the apparent V magnitudes of candidate stars against the detection limits of the ESPRESSO and HIRES spectrographs.", "goal": "Determine which stars from the candidates can be observed by both ESPRESSO and HIRES based on their apparent V magnitudes."}, "summary": "This problem requires understanding the observational capabilities of two spectrographs, ESPRESSO and HIRES, which have different limits for detecting stars based on their apparent V magnitudes. The task is to identify which stars from a list can be observed by both instruments, given that ESPRESSO can detect stars up to 17 mag and HIRES up to 16 mag. The solution involves comparing the apparent magnitudes of the candidate stars to these limits to find the correct pair that can be observed by both spectrographs."}