Table 1: Basic data of the observations for the analysed stars.
HD HJD $M_{\it {v}}$ Spectral type SNR Exp. time Remarks
72757 2454172.336 8.45 F0 190 3600  
72846 2454070.737 7.48 A5V 210 3600  
73175 2454171.406 8.25 F0Vn 155 3600 $\delta$Sct
73345 2454171.363 8.14 A7V 188 3600 $\delta$Sct
73450 2454171.494 8.59 A9V 185 3600 $\delta$Sct
73574 2454171.585 7.75 A8V 170 3600  
73666 2454070.682 6.61 A1V 326 1800 speckle binary
73746 2454172.514 8.72 F0V 154 3600 $\delta$Sct
73798 2454172.424 8.48 F0V 190 3600 $\delta$Sct
73993 2454171.450 8.56 F2V 134 3600 variable
74028 2454171.318 7.97 A7V 185 3600 $\delta$Sct
74050 2454170.566 7.91 A6Vn 160 3600 $\delta$Sct
74135 2454172.559 8.88 F0 120 3600  
74587 2454172.468 8.51 A5 177 3600  
74589 2454172.379 8.46 F0 200 3600  
74656 2454170.537 8.04 Am 226 2 $\times$ 3600 sum of two exposures
74718 2454171.538 8.39 A5 172 3600  
The SNR are calculated at $\sim $5500 Å in a bin of 0.5 Å. The exposure time is in seconds.
The HJD indicate the Heliocentric Julian Date at the middle of the exposure.

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