2 Observations

$R=\frac{\lambda}{\bigtriangleup \lambda}=18\,500$ spectra have been obtained with the Echelle spectrograph mounted at the Cassegrain focus of the 1.82m telescope which is operated by the Padova and Asiago Astronomical Observatories on top of Mt. Ekar (Asiago, Italy). The detector has been a Thomson THX31156 CCD with 1024$\times$1024 pixels, 19 $\mu$m each, and the slit width has been set to 1.8 arcsec. The spectra cover the 4500-9000 Å range.

$R=\frac{\lambda}{\bigtriangleup \lambda}=57\,000$ spectra have been obtained during the commissioning phase of the SARG white-pupil Echelle spectrograph for the Italian 3.5 m Telescopio Nazionale Galileo (La Palma, Canary Islands). The detector is a mosaic of two $4k\times 2k$ thinned, back illuminated EEV CCDs. A 0.80 arcsec slit width has been used together with the YELLOW cross-disperser grism which provides a nearly complete spectral coverage from 4650 to 7900 Å. A journal of the observations is given in Table 1.

Figure 1: The region around the NaI doublet, showing the rotationally broadened stellar component and three sharper interstellar lines (SARG spectrum for Oct. 9, 2000). The upper spectrum shows the telluric absorptions in 28 Vul, a B6 IV fast rotating star ( $V_{\rm rot}~\sin~i=320$ km s-1) observed on the same night as StH$\alpha$ 190. 28 Vul suffers from a $E_{B-V} \sim 0.01$ responsible for the interstellar NaI lines marked by dots. Comparing 28 Vul and StH$\alpha$ 190 spectra reveals how nearly all the sharp and weak lines in the latter spectrum are telluric

Infrared photometry has been obtained at the 1.25 m telescope of the Crimean Astrophysical Observatory, giving J=8.74, H=8.25, K=8.08, L=7.48 on Nov. 20 and J=8.74, H=8.22, K=8.04, L=7.52 on Dec. 8, 2000 (with errors $\pm 0.02$ in JHK, $\pm 0.04$ in L).