Spectroscopic characterization of the known O-star population in Cygnus OB2 - Evidence of multiple star-forming bursts

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Table 1

Summary of the observational schedule at the INT.

	Semester	Dates	λ coverage	B (mag)	# Stars
Phase 1	16A	July 2016	Blue	B < 14.5	13 O-type
	16B	August 2016	Red	B < 14.5	52 O-type

Phase 2	17A	July 2017	Blue	14.5 < B < 16.0	12 O-type
	17B	August 2017	Blue + Red	14.5 < B < 16.0	2 + 14 O-type

Notes. Blue and Red indicate the (3900–5100 Å) and (6100–6800 Å) wavelength regions. Exposure times vary between 150 to 10 000 s, depending on the magnitude of each star.

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