Table 4
Equivalent widths of Na I D, Ca II H&K, of iPTF 16abc using X-shooter and UVES.
| Instrument | Date | Phase | R (λ/δλ) | S/N | Na I D1 | Na I D2 | Ca II H | Ca II K | ||||||
| (days) | (mÅ) | (mÅ) | (mÅ) | (mÅ) | ||||||||||
|
|
||||||||||||||
| X-shooter | Apr. 14 | –6.1 | 7450 | 113 | 512 | ± 6 | 606 | ± 6 | 141 | ± 4 | 238 | ± 8 | ||
| UVES | Apr. 16 | –3.6 | 68 000 | 20 | 517 | ± 7 | 585 | ± 7 | 147 | ± 7 | 240 | ± 6 | ||
| UVES | Apr. 24 | 4.3 | 87 000 | 25 | 511 | ± 5 | 597 | ± 5 | 155 | ± 6 | 238 | ± 6 | ||
| X-shooter | May 12 | 21.2 | 7450 | 73 | 497 | ± 10 | 592 | ± 10 | 138 | ± 8 | 227 | ± 9 | ||
|
|
||||||||||||||
| Average | 511 | ± 3 | 597 | ± 3 | 145 | ± 3 | 237 | ± 3 | ||||||
Notes. The resolution of the UVES spectra were estimated from the full width at half-maximum intensity (FWHM) of several telluric features, while the nominal resolution of the X-shooter spectra are given. The S/N per pixel is measured around the wavelength of Na I D.
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