Slitless spectrophotometry with forward modelling: Principles and application to measuring atmospheric transmission

Open Access

Table 2

Emission lines detected in the spectrum of planetary nebula PNG321.0+3.9 with a S/N above 10.

Line	Tabulated nm	Detected nm	Shift nm	FWHM	Amplitude erg s⁻¹ cm⁻² nm⁻¹	SNR	EQW nm
He_I	388.8	383.8	−5.0	14.1	1.1e-13	46.0	−28.3
Hβ	486.3	485.6	−0.7	4.0	3.9e-14	17.1	−3.0
Fe_II	515.8	513.6	−2.2	6.5	2.5e-14	10.9	−9.6
Ηα	656.3	656.3	−0.0	4.8	1.9e-13	84.6	−44.5
C_II	723.5	722.9	−0.6	3.2	6.4e-14	28.0	−7.1
He_I	861.7	865.6	3.9	8.7	5e-15	10.2	−2.5
C_III	970.5	968.8	−1.7	6.4	1.1e-14	22.9	−1.5
He_I	1023.5	1024.3	0.8	10.4	5.6e-15	13.2	−4.7

Notes. The third column gives the centroid of the fitted Gaussian profile, and the fourth column lists the distance to the tabulated value. The EQW is reported in the last column.

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