Table 1
Spectral characterisation of the stars observed.
| Star | UCAC4 IDa | R mag b | J − K c | Spectral type |
|
|
||||
| W17 | 310-085339 | 11.31 | 0.29 ± 0.06 | F5.5−G8.0 |
| Ref 2 | 310-085352 | 13.26 | 0.29 ± 0.05 | F7.5−G8.0 |
| Ref 3 | 310-085281 | 12.26 | 0.37 ± 0.06 | G4.0−K1.0 |
| Ref 4 | 310-085328 | 14.9 | 0.42 ± 0.07 | G9.0−K3.0 |
| Ref 5 | 310-085333 | 14.82 | 0.66 ± 0.06 | K5.0−K7.0 |
| Ref 6 | 310-085382 | 12.7 | 0.42 ± 0.04 | G9.0−K2.0 |
Notes.
The stellar catalogue IDs are given using references from The fourth US naval observatory CCD astrograph catalog (UCAC4; Zacharias et al. 2013).
R magnitudes are obtained from the UCAC2 catalogue (Zacharias et al. 2004).
J and K magnitude are obtained from the UCAC3 catalogue (Zacharias et al. 2010). These magnitude differences are converted to spectral type by using estimates from Table 2 of Ducati et al. (2001), assuming all the stars are main sequence.
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