Table 1.
Log of the YY Dra GTC/EMIR spectroscopy.
| Date | Epoch | ABBA | Orbital phase | Airmass | Seeing | K |
|---|---|---|---|---|---|---|
| cycles | coverage | (arcsec) | (mag) | |||
| 2020 February 13 | 1 | 12 | 0.17 − 0.59 | 1.36 − 1.38 | 0.76 − 0.89 | 12.2 |
| 2021 May 5 | 2 | 12 | 0.88 − 0.30 | 1.36 − 1.40 | 0.67 − 0.94 | 12.2 − 12.4 |
| 2021 May 5 | 2 | 4 | 0.75 − 0.85 | 1.55 − 1.62 | 1.47 − 1.57 | 12.4 |
| 2022 May 12 | 3 | 8 | 0.48 − 0.73 | 1.37 − 1.42 | 0.86 − 0.94 | 12.3 |
| 2022 May 17 | 3 | 8 | 0.97 − 0.31 | 1.44 − 1.61 | 0.67 − 0.83 | 12.4 − 12.5 |
Notes. The orbital phases were calculated using the ephemeris given by Hill et al. (2022). Each ABBA nodding cycle had a 480 s on-source time. We measured the seeing as the FWHM of the spatial profile around λ = 2.2 μm. Differential photometry of the target relative to the nearby field star YY Dra-8 of Henden & Honeycutt (1995) in the acquisition images yielded the magnitudes. TYC 4395-97-1, the star used in Sect. 2.2, was out of the linear range of the detector.
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