Table 1
Observed targets.
| Target | Spectral | B − V | (B − V)0b | E(B − V)c | A V | vshiftd |
| typea | (mag) | (mag) | (mag) | (mag) | (km s-1) | |
|
|
||||||
| HD 167785 | B2 V | −0.09 | −0.211, −0.242 | 0.14 | 0.42 (0.05) | −7.0 |
| HD 326306 | B1 V | −0.11 | −0.231, −0.262 | 0.14 | 0.42 (0.05) | 8.0 |
| HD 153294 | B7 Ib/II | +0.03 | −0.041, −0.122 | 0.07, 0.15 | 0.22–0.47 | 14.0 |
| HD 152246 | O9 Ib | +0.12 | −0.271, −0.282 | 0.39 (0.03) | 1.22 (0.03) | 6.5 |
| HD 161056 | B1.5 V | +0.38 | −0.221, −0.252 | 0.62 (0.05) | 1.90 (0.05) | −3.5 |
| HD 161061 | O+ | +0.62 | −0.301, −0.292 | 0.92 (0.03) | 2.83 (0.04) | 7.5 |
| HD 147889 | B2 III/IV | +0.71 | −0.191, −0.242 | 0.90 (0.06) | 3.7 (0.1) | 10.0 |
| HD 183143 | B7 Iae | +1.00 | −0.041, −0.042 | 1.04 (0.03) | 3.97 (0.05) | −5.0 |
| 4U 1907+09 | O9 Ia | +3.2 | −0.281, −0.282 | 3.48 (0.03) | 10.9 (0.05) | 25.0 |
Notes..
Spectral types taken from the Simbad database, except for 4U 1907+09 taken from Cox et al. (2005) and HD 161061 taken from Mazzei & Barbaro (2011)
Intrinsic colours from (1) Wegner (1994) and (2) Fitzgerald (1970).
E(B − V) values are derived from B and V magnitudes (Simbad) and intrinsic colours, (B − V)0. We took the mean of the intrinsic colours from (1) and (2) with uncertainties including inaccuracy, by one step, in Morgan-Keenan spectral-luminosity classification. We adopt E(B − V)= 0.10 mag for HD 153294. AV = RV × E(B − V). We adopt RV = 3.1 except for HD 147889 (RV = 4.1) and HD 183143 (RV = 3.8). Uncertainties in parentheses.
The heliocentric radial velocity of the strongest components in the atomic line of K i (λrest = 7698.974 Å) used to shift the spectra to the respective “LSR” rest wavelengths. Corrections were verified for consistency using additional interstellar lines of the Na i D doublet, CH (λrest = 4300.303 Å), and CH+ (λrest = 4232.548 Å).
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