Evaporating very small grains as tracers of the UV radiation field in photo-dissociation regions

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Table 1

Observational parameters for PDRs with spatially resolved mid-IR populations.

Object	Star	Distance	Spectral	Kurucz	Radius^*	d_front		Instrument
		[pc]^a	type	spectrum^* [K]	[R_⊙]	[″]

NGC 7023 NW	HD 200775	430	B3Ve–B5^b^c^d	2 × 15 000^e	10	42	2600	Spitzer IRS-SL
NGC 7023 S						55	1500	ISO-CAM cvf
NGC 7023 E						155	250	ISO-CAM cvf

NGC 2023 N	HD 37903	470	B1.5V^f	24 000	6	164	400	Spitzer IRS-SL
NGC 2023 S						67	4000	Spitzer IRS-SL

ρ-Oph filament	HD 147889	118	B2III–B2V	22 000	5	610	520	ISO-CAM cvf

Notes.

^(*)

Derived from spectral type.

References.

^(a)

van den Ancker et al. (1997);

^(b)

Racine (1968);

^(c)

Finkenzeller (1985);

^(d)

Witt et al. (2006);

^(e)

Alecian et al. (2008);

^(f)

Diplas & Savage (1994).

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