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Table 1

Overview of the sample stars and observing log.

ID# Object Common name Sp.T.(a) V(b) (mag) B – V(b) (mag) U – B(b) (mag) Date YYYY-MM-DD Texp s S/N
ESPaDOnS R = 68 000
1(c) HD 66788 O8 V 9.454(10) −0.077(14) −0.931(19) 2010-02-01 2400 180
2 HD 14633 ON8.5 V 7.459(12) −0.204(13) −1.050(28) 2009-10-09 5200 430
3(c) HD 37061 NU Ori O9 V(d) 6.830 0.23 −0.59 2007-03-08 3 × 3200 700
4 HD 258691 O9 V 9.700(0) 0.570(0) −0.453(15) 2008-01-23 2 × 3440 200
5 HD 201345 ON9.2 IV 7.660 −0.130 −0.950 2010-07-26 2800 220
6 HD 57682 O9.2 IV 6.418(8) −0.189(6) −1.026(4) 2009-05-04 2 × 2400 700
7 HD 227757 O9.5 V 9.217(13) 0.186(13) −0.744(5) 2010-07-26 1160 90
8 BD −13 4930 O9.5 V 9.435(7) 0.273(17) −0.709(32) 2010-06-25 3200 140
9 BD +60 499 O9.5 V 10.300(23) 0.542(7) −0.507(9) 2008-08-19 3200 120
10 BD +57 247 O9.5 IV(e) 9.941(10) 0.204(5) −0.704(5) 2014-02-13 6960 160
11 HD 207538 O9.7 IV 7.305(14) 0.324(8) −0.640(0) 2008-07-30 4000 400
FEROS R = 48 000
12(c) HD 46966 O8.5 IV 6.881(11) −0.055(15) −0.912(12) 2006-01-03, 2006-01-05 2 × 600 550
13 HD 46202 O9.2 V 8.186(15) 0.178(11) −0.737(13) 2008-04-16 to 19, 2008-04-26 6 × 720 400
14 HD 38666 µ Col O9.5 V 5.169(4) −0.281(6) −1.077(64) 2011-11-07 120 300
15(c) HD 155889 O9.5 IV 6.551(9) −0.016(8) −0.881(13) 2012-05-20 400 320
16 HD 54879 O9.7 V(f) 7.638(13) −0.007(4) −0.867(4) 2012-05-19 600 260
FOCES R=40000
17 HD 214680 10 Lac O9 V 4.879(14) −0.201(8) −1.036(10) 2005-09-21 6 × 600 400
18 HD 34078 AE Aur O9.5 V 5.956(15) 0.225(5) −0.704(15) 2005-09-21 2 × 540, 3 × 450 250
19 HD 206183 O9.5 V 7.419(11) 0.126(12) −0.787(5) 2005-09-27 2700 200
20 HD 36512 υ Ori O9.7 V 4.618(13) −0.264(7) −1.068(8) 2005-09-28 2 × 360 300

Notes. (a)Spectral types for most objects were adopted from Martins et al. (2015a), which are mostly based on the work of Sota et al. (2011, 2014). (b)Mermilliod (1997), Morel & Magnenat (1978). (c)These stars show spectroscopic binarity or multiplicity and are excluded from the detailed analyses.(d)Bragança et al. (2012). (e)Hoag & Applequist (1965). (f)Sota et al. (2011).

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