Low-ionization structures in planetary nebulae - IV. The molecular hydrogen counterpart

Open Access

Table 1

Observation log.

Object	Filter	# Combined frames	Exp. time [s]
NGC 2392	H2 v=1-0 S(1)	12	240
NGC 2392	K-cont	6	240
NGC 6751	H2v=1-0S(1)	12	180
NGC 6751	K-cont	8	180
NGC 6818	H2v=1-0S(1)	12	180
NGC 6818	K-cont	7	180
NGC 6884	H2v=1-0S(1)	11	200
NGC 6884	K-cont	6	200
NGC 7354	H2v=1-0S(1)	11	200
NGC 7354	K-cont	7	200

Notes. The H₂ v=1–0 S(1) narrowband filter isolates the molecular H line centered at λ_c = 2.1239 µm, whereas the K-cont filter (λ_c = 2.0975 µm) is used to map the continuum emission, allowing the continuum subtraction of the H₂ v=1–0 S(1) images.

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