Table 2.
Photometric measurements of the companion.
| Instrument | Filter | λc (μm) | Δλ(μm) | Δmag | App. magnitude | Abs. magnitude | Fλ (W m−2μm−1) |
|---|---|---|---|---|---|---|---|
| HST/WFPC2 | F606W | 0.5997 | 0.1502 | >8.9 | >20.4 | >14.3 | <2.03 × 10−16 |
| HST/WFPC2 | F814W | 0.8012 | 0.1539 | 9.81 ± 0.48 | 19.71 ± 0.48 | 13.62 ± 0.62 | (1.37 ± 0.76) × 10−16 |
| SPHERE | BB-J | 1.245 | 0.240 | 10.05 ± 0.21 | 19.16 ± 0.21 | 13.07 ± 0.45 | (6.31 ± 1.39) × 10−17 |
| SPHERE | BB-H | 1.625 | 0.290 |
|
|
|
|
| NACO | Ks | 2.18 | 0.35 | 9.21 ± 0.16 | 17.40 ± 0.16 | 11.32 ± 0.43 | (3.44 ± 0.56) × 10−17 |
| NACO | Lp | 3.80 | 0.62 | >8.2 | >16.4 | >10.3 | <1.35 × 10−17 |
Notes. The apparent magnitudes in J, H, and Ks band were calculated using the closest 2MASS magnitude of CS Cha as calibration. The apparent magnitude in the HST F814W filter was computed using the theoretical Vega magnitude of CS Cha in this band given its SED. The absolute magnitudes were computed from the apparent magnitudes assuming a distance of 165 ± 30 pc. We give the central wavelength and spectral width of all filters along with the measurements. Spectral flux densities were computed using the filter curves of the instruments and a Vega spectrum taken with HST/STIS.
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