Table A.1
Possible optical counterparts of X6.
| Name | Object type | RA | Dec | Ang. Sep. from X6 | Distance | R band magnitude |
| (°) | (°) | (′′) | (pc) | (mag) | ||
|
|
||||||
| S1 | F or G star | 25.01375 | + 39.60553 | 11.6 | ~510 | 13.0 |
| S2 | G star | 25.00892 | + 39.60431 | 6.2 | ~1500 | 15.8 |
| O3 | unknown | 25.01044 | + 39.60440 | 3.9 | unknown | 20.7 |
Notes. The locations of the three objects are shown in Fig. A.2 and the spectra of S1 and S2 are presented in Fig. A.3. The magnitudes of S1 and S2 have been measured from PTF images and the one of O3 is from the Keck/LRIS image. All magnitudes are approximate because the point spread functions of the three objects overlap.
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