U Scorpii 2010 outburst: a new understanding of the binary accretion disk and the secondary star

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Table 1

Log of the observations.

UT date	Mid-HJD	Days after	Orbital	V ^**	Instrument	Setup (slit^†; R; binning^††; exptime)			Sky
(start)	(−245 500.)	outburst	phase^*	(mag)		UVB	VIS	NIR	transparency/seeing (′′)

29-Jan.-2010	225.8837	1.2	0.55	9.30	FEROS		1.8; 48 000; 1 × 1; 900 s		CLR/PHO; NA
30-Jan.-2010	226.8879	2.2	0.37	9.93	FEROS		1.8; 48 000; 1 × 1; 720 s		THN/TCK; NA
02-Feb.-2010	229.8634	5	0.79	11.33	FEROS		1.8; 48 000; 1 × 1; 240 s × 2 + 60 s × 6		THN/TCK; NA
05-Feb.-2010	232.8796	8	0.24	12.9	FEROS		1.8; 48 000; 1 × 1; 280 s × 6		NA; NA
07-Feb.-2010	234.8751	10	0.86	13.7	FEROS		1.8; 48 000; 1 × 1; 300 s × 3		NA; NA
14-Feb.-2010	241.8630	17	0.54	14.28	X-Shooter	0.8; 6200; 1 × 1; 120 s × 2	0.7; 11 000; 100,1 × 1; 190 s × 2	0.6; 8100; 270 s × 2	CLR; 0.9−3.0
24-Feb.-2010	251.8696	27	0.67	14.60	X-Shooter	0.8; 6200; 1 × 1; 180 s × 2	0.7; 11 000; 1 × 1; 250 s × 2	0.6; 8100; 113 s × 6	THN; 0.6−3.5
15-Mar.-2010	270.8176	46	0.07	17.61	X-Shooter	0.8; 6200; 1 × 1; 300 s × 4	0.7; 11 000; 1 × 1; 370 s.4	0.6; 8100; 153 s × 12	CLR; 0.7
11-Apr.-2010	297.8250	73	0.02	18.28	X-Shooter	1.0; 2550; 1 × 2; 600 s × 4	0.9; 4400; 1 × 2; 638 s × 4	0.6; 8100; 227 s × 12	PHO; 0.6
12-May-2010	328.7723	104	0.17	18:	X-Shooter	1.0; 2550; 1 × 2; 1030 s × 2	0.9; 4400; 1 × 2; 1068 s × 2	0.6; 8100; 300 s × 6	CLR; 0.6
05-Jul.-2010	382.7130	125	0.00	19.16	X-Shooter	1.0; 2550; 1 × 2; 1030 s × 2	0.9; 4400; 1 × 2; 1068 s × 2	0.6; 8100; 300 s × 6	CLR; 0.7−1.7

Notes.

^(*)

The spectra have been phased using the ephemeris in Schaefer et al. (2011).

^(**)

Courtesy of Brad Schaefer.

^(†)

In the case of FEROS, 1.8 is the fiber diameter on sky, in arcsec.

^(††)

In the case of X-Shooter the binning is in the dispersion direction.

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