O-77.F-0616-2006

PI: F. Schoier (fredrik@astro.su.se)

Title: Chemical differentiation in the protostellar binary R CrA IRS7

Frontend: APEX-2A

Backend: FFTS1 8192 channels

Lines/Frequencies:

C17O(3-2) 337.1 GHz LSB
C34S(7-6) 337.4 GHz LSB
C2H(4-3) 349.3 GHz USB
CH3OH(7k-6k) 338.4 GHz LSB

The PI wants to tune to 337.7 GHz using offsets +/- 500 MHz of the two FFTS1 bands. This will likely cause interferences. Also the outermost edges of the FFTS are bad, so offsets of +/- 450 MHz centered at 337.8 GHz is better, it covers all lines above (and the high energy CH3OH ones). Maybe one should start with a few quick tests on different offsets.

June 27 2006 PerBergman.

Time allocated: 10 hrs (10.4 hrs observed)

Goals

rms 50 mK at 0.1 km/s resolution in all positions (this will not be reachable with 10 hrs of observing time)

Source list and status:

All lines are obtained in one setting, see above.

Source	line	Integrated	Tpeak	rms (mK)	S/N	Remarks
		on sou (min)	(K)	@ dv=0.43
R CrA IRS7A	C17O	8.5	2.3	33	66	This is for central position.
	C34S	8.5	0.4	33	11	Other positions have rms~65 mK for tint=3.3 min @0.4 km/s
	C2H	8.5	2.15	33	60
	CH3OH	8.5	0.6	33	17

Summary of observations and links to observing logs

Date	Time (UTC)	Time spent	Scan number	Lines	Objects	Observer	Remarks
30 Jun 2006	06:00 - 09:30	3.5 h	24600-24653	C17O, C34S, C2H, CH3OH	R CrA IRS7A	PBE - VRE - CAG	PWV ~0.9 mm
3 Jul 2006	06:40 - 09:30	2.9 h	25276-25323	C17O, C34S, C2H, CH3OH	R CrA IRS7A	PBE - VRE - CAG	PWV ~0.7 mm
12 Jul 2006	04:10 - 08:10	4.0 h	26730-26793	C17O, C34S, C2H, CH3OH	R CrA IRS7A	PBE-MDU-MMA-FAZ	PWV ~0.6-0.9 mm

Project is completed.