Table 4.
Summary of the orbital elements, rotation, and distance indicators of Be star binary systems hosting a pre-subdwarf companion.
| System | Sp. type | Period | Amplitude | Eccentricity | Inclination | Rotation | Parallax | V-band | Sources |
|---|---|---|---|---|---|---|---|---|---|
| lit. | P [d] | K [km s−1] | e | i [deg] | [km s−1] | [mas] | [mag] | for orbit | |
| LB-1 | B3V | 78.7999 ± 0.0097 | 52.94 ± 0.13 | 0* | N/A | 7 ± 2 | 0.4 | 11.5 | 1 |
| HR 6819 | B2V | 40.3315 ± 0.0003 | 62.13 ± 0.04 | 0* | 49 ± 1.9 | < 25 | 2.7 | 5.4 | 2,3 |
| V742 Cas | B5II | 55.930 ± 0.004 | 86.9 ± 1.1 | 0* | 119.4 ± 0.3 | ∼10 | 1.4 | 7.1 | This work |
| HD 44637 | B2V:pe | > 180 | > 30 | N/A | N/A | < 25 | 1.1 | 9.1 | This work |
| V447 Sct | B1:V:npe | 58.41 ± 0.06 | 87.4 ± 2.9 | 0* | N/A | ∼60 | 0.6 | 7.9 | This work |
| V1362 Cyg | B5II:n | 56.82 ± 0.03 | 82.0 ± 2.9 | 0* | N/A | < 25 | 0.9 | 8.2 | This work |
| V2174 Cyg | B2II | 225.33* | 61.1 ± 1.2 | 0.075 ± 0.020 | N/A | < 60 | 0.6 | 8.9 | 4 |
Notes. Values without uncertainties were fixed (marked with an asterisk). The literature spectral type in all cases refers to the pre-subdwarf absorption spectrum, and not the Be star. Notes: 1: Shenar et al. (2020), 2: Frost et al. (2022), 3: Bodensteiner et al. (2020a), 4: Bolton & Hurkens (2001).
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