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Table 6.
Properties of the three groups of PMS stars in Cepheus.
| Parameter | Unit | Cep I | Cep II | Cep III |
|---|---|---|---|---|
| ⟨l⟩ | [°] | 122.31 ± 0.04 | 120.7 ± 2.0 | 118.7 ± 2.8 |
| ⟨b⟩ | [°] | 16.31 ± 0.14 | 16.37 ± 0.33 | 15.7 ± 1.7 |
| ⟨μα cos δ⟩ | [mas yr−1] | 23.88 ± 0.29 | 22.63 ± 0.25 | 20.35 ± 0.34 |
| ⟨μδ⟩ | [mas yr−1] | −3.11 ± 0.25 | −0.31 ± 0.51 | 1.98 ± 0.49 |
| ⟨RV⟩ | [km s−1] | −9.05 ± 0.24 | −8.98 ± 0.3 | −8.30 ± 0.43 |
| ⟨π⟩ | [mas] | 6.713 ± 0.016 | 6.439 ± 0.054 | 6.044 ± 0.094 |
| ⟨Trigo. distance⟩ | [pc] | 148.97 ± 0.36 | 155.7 ± 1.3 | 167.7 ± 2.9 |
| ⟨X⟩ | [pc] | 76.43 ± 0.19 | 76.0 ± 0.5 | 75.9 ± 1.0 |
| ⟨Y⟩ | [pc] | 120.86 ± 0.29 | 128.5 ± 1.4 | 141.7 ± 2.7 |
| ⟨Z⟩ | [pc] | 41.75 ± 0.13 | 43.9 ± 0.4 | 45.1 ± 0.8 |
| ⟨U⊙⟩ | [km s−1] | 7.90 ± 0.29 | 9.15 ± 0.28 | 9.99 ± 0.33 |
| ⟨V⊙⟩ | [km s−1] | −16.08 ± 0.26 | −15.54 ± 0.24 | −14.02 ± 0.44 |
| ⟨W⊙⟩ | [km s−1] | −5.43 ± 0.26 | −5.70 ± 0.15 | −5.42 ± 0.27 |
| Age | [Myr] | 15 ± 5 | 15 ± 5 | 15 ± 5 |
| Number of targets [sources] ( ‡ ) | 3 [7] | 8 [14] | 18 [29] | |
| Fraction of systems | 100% | 75% | 61% | |
| Number of single stars | 0 | 2 | 7 | |
| Number of SB1 systems | 0 | 1 | 2 | |
| Number of visual binaries | 1 | 3 | 7 | |
| Number of multiple systems | 2 | 2 | 2 | |
Notes. ( ‡ )We give for each group the number of targets listed in Table 1, while that of resolved sources in the Gaia DR2 catalog (Tables 4 and 5) is bracketed.
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