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Table 5.
Spectral types and physical properties of the O, B, and A stars in the M 8 KMOS sample.
| ID | X-ray ID (CXOU J) | Other ID | Previous ST | ST this work | AK (mag) | Teff (K) | log L/L⊙ |
|---|---|---|---|---|---|---|---|
| Previously classified OB stars in M 8 included in our KMOS sample | |||||||
| 14 | 180345.10−242205.2 | CD-24 13810 | B...(a) | B2−B4V | 0.23 ± 0.01 | 18 650 ± 1950 | 3.54 ± 0.14 |
| 33 | 180411.16−242145.1 | NGC 6530 32 | B3Ve (b) | B1−B3 | 0.16 ± 0.03 | 21 500 ± 4500 | 3.35 ± 0.3 |
| 36 | 180415.03−242327.8 | HD 315032 | B1V (b) | B1−B2Vz | 0.16 ± 0.02 | 23 300 ± 2700 | 3.84 ± 0.17 |
| O5 | 180423.99−242126.7 | NGC 6530 60 | B1Ve (b) | O9−B1−SB2 | 0.17 ± 0.01 | 29 250 ± 3250 | 4.03 ± 0.13 |
| O6 | 180424.29−242059.5 | NGC 6530 61 | B2Ve (b) | B1−B2V | 0.1 ± 0.02 | 23 300 ± 2700 | 3.47 ± 0.17 |
| O7 | 180425.55−242044.9a | NGC 6530 66 | B2Vep (b) | B0−B2V | 0.13 ± 0.03 | 26 050 ± 5450 | 3.63 ± 0.28 |
| O8 | 180427.19−242249.6 | NGC 6530 70 | B2Ve (b) | B1−B2V | 0.19 ± 0.02 | 23 300 ± 2700 | 3.5 ± 0.17 |
| 60 | 180428.98−242526.2 | NGC 6530 74 | B2.5Ve (b) | B2−B5 | 0.1 ± 0.02 | 18 150 ± 2450 | 3.0 ± 0.19 |
| O10 | 180432.98−242312.5a | NGC 6530 80 | B1V (b) | O9−B1 | 0.17 ± 0.01 | 29 250 ± 3250 | 4.12 ± 0.13 |
| 73 | 180434.20−242200.6 | NGC 6530 86 | B2.5V (b) | B0−B3V | 0.3 ± 0.04 | 24 250 ± 7250 | 3.78 ± 0.4 |
| O11 | 180439.92−242244.4 | NGC 6530 99 | B2.5Vne (b) | B2−B5V | 0.15 ± 0.02 | 18 150 ± 2450 | 2.97 ± 0.19 |
| 79 | 180441.68−242058.5 | HD 164947A | B1/2Vne (b) | B2−B5V | 0.11 ± 0.02 | 18 150 ± 2450 | 3.38 ± 0.19 |
| Candidate OB stars in M 8 included in our KMOS sample | |||||||
| 24 | 180400.80−242334.6 | − | − | B0−B2V | 0.84 ± 0.03 | 26 050 ± 5450 | 4.03 ± 0.28 |
| 48 | 180423.55−242116.8 | − | − | G8−K0IV-V | 0.21 ± 0.01 | 5385 ± 105 | 1.73 ± 0.03 |
| New OB and A stars in M 8 | |||||||
| 16 | 180346.16−242149.4 | − | − | B2−B5V | 0.19 ± 0.02 | 18 150 ± 2450 | 2.84 ± 0.19 |
| 51 | 180424.29−242059.6 | − | − | B2−B3V | 0.07 ± 0.01 | 18 800 ± 1800 | 3.18 ± 0.12 |
| 55 | 180425.72−241949.6 | − | − | A5−F2III-IV | 0.17 ± 0.01 | 9752 ± 2948 | 2.29 ± 0.21 |
| 69 | 180433.03−242252.9 | − | − | A0−A5V | 0.01 ± 0.01 | 8890 ± 810 | 1.74 ± 0.12 |
| F19 | 180404.31−242130.4 | − | − | A5−F4V | 0.02 ± 0.01 | 7940 ± 140 | 1.42 ± 0.03 |
| F36 | 180420.48−242303.9 | − | − | A8−F2III | 1.38 ± 0.01 | 8055 ± 1251 | 2.4 ± 0.12 |
| F44 | 180422.10−242546.6 | − | − | B0−B3 | 0.63 ± 0.04 | 24 250 ± 7250 | 3.19 ± 0.4 |
| F47 | 180426.73−242351.7 | − | − | A5−A9V | 0.2 ± 0.01 | 7760 ± 320 | 1.53 ± 0.05 |
| Previously classified OB stars in M 8 not included in our KMOS sample | |||||||
| − | 180340.32−242242.8 | HD 164740 | O7.5V+O9V+B0.5V (b) | − | − | 36 000 | − |
| − | 180352.45−242138.5 | HD 164794 | O4V((f)) (b) | − | − | 42 000 | 5.82 |
| − | 180356.85−241845.0 | HD 164816 | O9.5V+B0V (b) | − | − | 31 500 | 4.94 |
| − | 180414.50−241437.0 | HD 315026 | B1.5V (b) | − | − | 24 000 | − |
| − | 180420.55−241354.7 | NGC 6530 55 | B2.5Ve (b) | − | − | 19 000 | 3.4 |
| − | 180421.27−242118.2 | NGC 6530 56 | B0.5V (b) | − | − | 28 000 | 4.25 |
| − | 180422.74−242209.8 | NGC 6530 58 | B2Ve (b) | − | − | 21 000 | − |
| − | 180423.22−242616.7 | HD 315033 | B2Vp (b) | − | − | 21 000 | 3.99 |
| − | 180425.83−242308.4 | HD 164906 | B0Ve (b) | − | − | 29 500 | − |
| − | 180428.02−242142.9 | HD 315031 | B1V (b) | − | − | 26 000 | 4.42 |
| − | 180432.91−241844.6 | NGC 6530 83 | B2.5Vne (b) | − | − | 19 000 | 3.41 |
| − | 180435.99−241952.2 | HD 315021 | B1V (b) | − | − | 26 000 | − |
| − | 180441.65−242055.1 | HD 164947B | B2.5V (b) | − | − | 19 000 | 3.42 |
| − | 180448.62−242635.5 | NGC 6530 SJ 75 | B2.5 (a) | − | − | 19 000 | 3.5 |
| − | 180456.26−242403.4 | HD 315034 | B3 (a) | − | − | 17 500 | 2.8 |
| − | 180459.03−242723.1 | HD 315035 | B3V (b) | − | − | 17 500 | − |
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