The Tucana dwarf spheroidal galaxy: not such a massive failure after all

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Table 2.

Observing log of the P91 VLT/FORS2 MXU observations of RGB targets along the line of sight to the Tucana dSph.

Field	Position (RA, Dec)	Date/time	Exp.	Airmass	DIMM seeing	Grade ^( ⋆ )	Slits
	(J2000)	(UT)	(s)		(″)
Tuc0	22:41:56, −64:24:43	2013-07-30/04:26	3400	1.44	0.78	B	27 (16+11)
		2013-08-01/04:46	3400	1.39	0.80	A
		2013-08-01/05:44	3400	1.32	0.92	A
		2013-08-01/06:42	3400	1.30	0.90	A
		2013-08-05/06:04	3400	1.30	0.98	A
		2013-08-05/07:02	3400	1.31	1.13	A
		2013-08-13/03:49	3400	1.41	0.69	A
		2013-08-13/04:47	3400	1.33	0.57	A
		2013-08-28/03:18	3400	1.36	0.65	A
		2013-08-30/03:43	3400	1.33	0.89	A
Tuc1	22:42:04, −64:24:47	2013-09-05/02:07	3500	1.43	1.62	C ^(a)	27 (20+7)
		2013-09-06/03:34	3500	1.31	0.77	A
		2013-09-06/04:37	3500	1.30	0.89	A
		2013-09-13/01:53	3500	1.40	1.49	C ^(b)
		2013-09-13/02:54	3500	1.32	1.45	B
		2013-10-01/01:35	3500	1.33	0.68	A
		2013-10-25/02:17	3500	1.33	1.04	B
		2014-07-21/07:28	3500	1.30	0.92	A
		2014-07-21/08:40	3500	1.33	1.05	A
		2014-07-27/06:07	3500	1.32	0.70	A
		2014-07-27/07:10	3500	1.30	0.60	A
		2014-07-27/08:18	200	1.33	0.65	C ^(c)
		2014-07-29/05:14	3500	1.37	0.62	A

Total							54

Notes. From left to right, column names indicate: the pointing field name; the field center coordinates; observing date and starting time of the scientific exposure; the exposure time in seconds; the starting airmass; the average DIMM seeing during the exposure in arcsec; the ESO OB fulfillment grades (a full description is reported in the notes below); the number of slits/observed objects per mask. For each field, the mask design remained identical in each OB. The total number of slits (54) is reported in the last row of the table. ^( ⋆ )ESO OB fulfillment Grades: (A) fully within constraints – OB completed; (B) mostly within constraints, some constraint is 10% violated – OB completed; (C) out of constraints – OB must be repeated:

^(a)

seeing increased up to ∼1.2″ at OB’s end – FWHM of spectra ∼1.0″.

^(b)

Seeing, FLI, and Moon distance out of constraints.

^(c)

Aborted after 200 s because sky conditions changed to thin clouds.

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