Modeling the physical and excitation conditions of the molecular envelope of NGC 7027

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Volume 545 (September 2012)

A&A, 545 (2012) A114

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Table 2

Best-fit model parameters for the main molecular envelope of NGC 7027.

Shell	r _polar ^†	r _equatorial ^†	Δr^⋆	V _r ^‡	V _z ^*	X(¹²CO)	n	T
	(10¹⁶ cm)	(10¹⁶ cm)	(10¹⁶ cm)	(km s^-1)	(km s^-1)		(cm^-3)	(K)

I: Inner shell	13.5	7.5
M 1: Middle 1 shell	15.75	9.75
M 2: Middle 2 shell	18.0	12.0
O: Outer shell	22.5	16.5

Notes. The sizes correspond to a distance to the nebula of 1 kpc. The uncertainty range is included for every parameter except the sizes of the shells, which depend on the corresponding uncertainties on the shell thicknesses. The X(¹³CO) abundances are 50 times lower than their X(¹²CO) counterparts.

^(†)

Distance from the star which traces the shell’s outer edge, both at the pole and equator.

^(⋆)

Thickness of the shell.

^(‡)

Expansion velocity radially outwards from the central star.

^(*)

Additional velocity component along main axis, activated for distances to the equator greater than 1.5 × 10¹⁶ cm.

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