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Table 4

Detected molecular species in the observed Class I sources.

Species(a) L1489 B5 L1455 L1551
IRS IRS1 IRS1 IRS5
CO Y(1) Y(1) Y(1) Y(1)
13CO Y(1) Y(1) Y(1) Y(1)
C18O Y(1) Y(1) Y(1) Y(1)
13CN Y(2) Y(6)
C15N Y(1) Y(1) Y(2)
13CS Y(1) Y(1) Y(1)
SO Y(2) Y(2) Y(2) Y(2)
34SO Y(1) Y(1)
SiO Y(1)
CCD Y(1) Y(2) Y(2) Y(2)
DCN Y(1) Y(1) Y(1) Y(1)
N2D+ Y(1) Y(1) Y(1)
DCO+ Y(1) Y(1) Y(1) Y(1)
SO2 Y(1) Y(1) Y(2)
OCS - - Y(2) Y(2)
O13CS - Y(1)
H2S Y(1) Y(1)
CCS Y(1) Y(2)
H2CO Y(3) Y(4) Y(4) Y(4)
D2CO Y(1) Y(2) Y(2) Y(4)
H2CS Y(1) Y(1) Y(1)
H2C33S Y(1)
HDCS Y(2) Y(1)
HNCO Y(1) Y(1)
c-C3H Y(3)
c-C3H2 Y(4) Y(6) Y(5) Y(6)
H2CCO Y(2)
CH3OH Y(1) Y(1) Y(9)
CH2DOH Y(1) Y(1) Y(1)
CH3CN Y(5)
CH3CCH Y(3)
CH3CHO Y(3)
HCOOCH3 Y(3)

Total 17 29 36 75

Notes. The number of lines are reported in parentheses. (a)Some species have been detected using less than three lines, according to the criteria explained in Sect. 4.1.

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