Table 5
De-reddened magnitudes and colours of the 4 candidate counterparts to 2XMM J174016.0−290337.
| Star | J | H | K | J−H | J−K | H−K | Spectral Type | Distance | ||||||
| (mag) | (mag) | (mag) | (mag) | (mag) | (mag) | (kpc) | ||||||||
|
|
||||||||||||||
| 1 | 13.50 ± 0.14 | 13.05 ± 0.16 | 13.09 ± 0.13 | 0. 44 ± 0.21 | 0. 41 ± 0.19 | −0. 04 ± 0.21 | G/K V | 0.5–1.1 | ||||||
| – ″ – | – ″ – | – ″ – | – ″ – | – ″ – | – ″ – | K1 III | 8.3 | |||||||
| 2 | 12.83 ± 0.09 | 12.99 ± 0.12 | 13.29 ± 0.09 | −0. 16 ± 0.15 | −0. 56 ± 0.13 | −0. 30 ± 0.15 | – | – | ||||||
| 3 | 13.74 ± 0.11 | 13.19 ± 0.12 | 13.07 ± 0.09 | 0. 55 ± 0.16 | 0. 67 ± 0.14 | 0. 12 ± 0.15 | K4 V | 0.5 | ||||||
| – ″ – | – ″ – | – ″ – | – ″ – | – ″ – | – ″ – | K1 III | 8.7 | |||||||
| 4 | 14.05 ± 0.11 | 13.68 ± 0.13 | 13.57 ± 0.09 | 0. 37 ± 0.17 | 0. 48 ± 0.14 | 0. 11 ± 0.16 | G5–K5 V | 0.6–1.3 | ||||||
Notes. The colours and magnitudes of source 2 have been de-reddened to show that an extinction correction does not lead to colours or magnitudes that correspond to a single spectral type. The colours of the stars after extinction correction are used to identify probable spectral types and magnitudes then used to estimate the distance to such a star for the other 3 candidate counterparts. There are two possible solutions to the spectral type of source 3, one a distant giant, the second a more local dwarf. The position of source 3 on the colour–magnitude diagram (Fig. 10) suggest the distant giant is the more likely real spectral type.
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