Table 1
Star sample and photometric/spectroscopic data.
| Star | HD 156292 | HD 24431 | HD 105627 | HD 116852 | HD 153426 | HD 218195 | HD 36861 A | HD 115455 | HD 135591 |
|---|---|---|---|---|---|---|---|---|---|
| (λ Orionis A) | |||||||||
| Spec. type | O9.7III | O9III | O9III | O8.5II-III((f)) | O8.5III | O8.5III Nstr | O8III | O8III((f)) | O8IV((f)) |
| Spec. bin. | SB2 | – | – | – | SB2 | – | – | SB2 | |
| Member. | NGC 6322 | Sh 2-205 | – | – | Sh 2-2 | Cep OB1 | Sh 2-264 | RCW 75 | ASCC 79 |
| Cam OB1 | Collinder 69 | Cen OB1 | |||||||
| Ori OB1 | |||||||||
| Johnson U | 7.101 | 6.507 | 7.270 | 8.380 | 6.650 | 7.657 | 2.196 | 7.400 (a) | 4.442 |
| Johnson B | 7.773 | 7.117 | 8.182 | 8.380 | 7.610 | 8.650 | 3.218 | 8.170 (a) | 5.372 |
| Johnson V | 7.509 | 6.745 | 8.140 | 8.470 | 7.470 | 8.357 | 3.405 | 7.970 (a) | 5.457 |
| Johnson R | – | 6.360 (a) | – | – | – | – | – | – | – |
| Johnson I | – | 6.100 (a) | – | – | – | – | – | – | – |
| 2MASS J | 6.944 | 5.917 | 7.985 | 8.720 | 7.057 | 7.755 | 3.735 (b) | 7.469 | 5.554 |
| 2MASS H | 6.886 | 5.826 | 8.030 | 8.789 | 7.056 | 7.708 | 3.769 (b) | 7.442 | 5.566 |
| 2MASS Ks | 6.855 | 5.839 | 8.069 | 8.795 | 7.027 | 7.735 | 3.876 (b) | 7.454 | 5.616 |
| E(B − V) | 0.52 | 0.63 | 0.30 | 0.17 | 0.40 | 0.55 | 0.07 | 0.46 | 0.17 |
| Dist. (pc) |  |
 |
 |
22 726−12 766 |  |
 |
 |
 |
 |
| 2857−1956 (c) | |||||||||
| SWP № | 16 218 | 30 166 | 20 623 | 09332 | 01517 | 26 975 | 46 234 | 16 087 | 48 294 |
| 07827-28 | 46 237 | ||||||||
| 07828 | 46 241 | ||||||||
| 46 245 | |||||||||
| 46 247 | |||||||||
| SWP date | 1982-Jan-31 | 1987-Jan-26 | 1983-Aug-06 | 1980-Jun-20 | 1978-May-10 | 1985-Oct-24 | 1992-Nov-12 | 1982-Jan-21 | 1993-Aug-03 |
| 1980-Jan-31 | 1992-Nov-12 | ||||||||
| 1980-Jan-31 | 1992-Nov-12 | ||||||||
| 1992-Nov-12 | |||||||||
| 1992-Nov-12 | |||||||||
| LWP № | – | 10 024 | 16 537 | 15 610 | 06841 | 06987 | 15 311 | – | 25 759 |
| LWP date | – | 1987-Jan-26 | 1983-Aug-06 | 1989-May-27 | 1980-Feb-02 | 1985-Oct-25 | 1989-Apr-05 | – | 1993-Jun-17 |
| Vis. inst. | FEROS | ESPADONS | FEROS | FEROS | FEROS | ESPADONS | NARVAL | FEROS | FEROS |
| Vis. date | 2016-Mar-23 | 2011-Nov-07 | 2016-Mar-18 | 2016-Mar-18 | 2016-Mar-18 | 2011-Jul-05 | 2007-Sep-21 | 2016-Mar-18 | 2016-Mar-18 |
Notes. Spectral types, spectroscopic binary classification, and memberships are from Sota et al. (2014). Photometric data are from Maíz-Apellániz et al. (2004) with exception to the specific references. Color excesses are calculated considering intrinsic colors calibrated by spectral type from Martins & Plez (2006). Distances are from Gaia Collaboration (2018). For HD36861, we adopted the distance from the mean Gaia DR2 parallaxes for the components C and D, as in Gordon et al. (2018). Distance from van Leeuwen (2007) for HD 116852 is shown too. All distances are obtained from the direct inversion of the measured parallaxes. We list information about the analyzed data in the UV (SWP and LWP number and observation date) and in the visible (instrument name/observation date) regions.
References. (a) Ducati (2002). (b) Cutri et al. (2003). (c)van Leeuwen (2007).
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