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Table 1

Program stars and properties of LOSs.

Star Name Spectral type E(B − V) (mag) AV (mag) Reference
BD+31°643 ... B5V 0.86 ± 0.04 2.45 ± 0.15 1
BD+40°4212 Cyg OB2 3 O9 1.90 5.89a 2
BD+40°4220 Cyg OB2 5 O7f 1.99 6.17a 3
HD 23180 o Per B1III 0.30 ± 0.04 0.93 ± 0.16 1
HD 24432 ... B3II 0.73 ± 0.04 2.02 ± 0.14 1
HD 37022 θ1 Ori C O6V 0.31 ± 0.05 1.78 ± 0.36 1
HD 41690 ... B1V 0.47 ± 0.04 1.37 ± 0.16 1
HD 183143 HT Sge B7Iae 1.27 3.94a 3

Notes. (1) Valencic et al. (2004); (2) Leitherer et al. (1982); (3) Sonnentrucker et al. (2018) and Fan et al. (2019). (a)If adopting the total-to-selective extinction ratio of the Milky Way (RV = 3.1, Cardelli et al. 1989; Siebenmorgen et al. 2023).

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