Chemistry of massive young stellar objects with a disk-like structure

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Table 1

Coordinates, luminosity, distance, galactocentric radius, velocity of the local standard of rest, ¹²C/¹³C isotope ratio and the typical line width for the observed sources.

Sources	α(2000)	δ(2000)	L	d	R_GC^*	V _LSR	¹²C/¹³C	ΔV
			[10⁵L_⊙]	[kpc]	[kpc]	[km s^-1]		[km s^-1]

IRAS 20126+4104	20:14:26.04	+41:13:32.5	0.13^a	1.64^b	8.3	–3.5	70	6^c
IRAS 18089-1732	18:11:51.40	–17:31:28.5	0.32^d	2.34^e	6.2	33.8	54	5^c
G31.41+0.31	18:47:34.33	–01:12:46.5	2.6^f	7.9^g	4.5	97.0	41	6–10^h

Notes.

^(*)

The galactocentric radii were calculated using distances d in this table and a IAU recommended distance from the galactic center R₀ = 8.5 kpc. The ¹²C/¹³C isotope ratios are calculated from Eq. (11).

References.

^(a)

Cesaroni et al. (1997),

^(b)

Moscadelli et al. (2011),

^(c)

Leurini et al. (2007),

^(d)

Sridharan et al. (2002),

^(e)

Xu et al. (2011),

^(f)

Cesaroni et al. (1994b),

^(g)

Churchwell et al. (1990),

^(h)

Fontani et al. (2007).

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