This paper presents studies of four sharp-lined B and A stars using
spectrograms obtained at the 2.15 m telescope of the Complejo Astronomico El
Leoncito (CASLEO) and a REOSC echelle spectrograph, which is on loan from
the Institute d'astrophysique de Liége, Belgium, and a TEK 1024 CCD.
The cross disperser was a grating with 1200 lines 
. The
resolution is 0.10 
. The spectral reductions were
made using IRAF 2.10
. From bias and flat fields we
obtained a combined flat field which was used to divide the stellar spectra
to remove the pixel-to-pixel variations. The extraction was performed with
APALL and the wavelength calibration with IDENTIFY and DISPCOR using the
comparison spectra. Additional details are given in Paper I (Pintado &
Adelman 1996).
In that paper comparisons of equivalent widths obtained with the REOSC and
other spectrographs indicated that the REOSC equivalent widths were in some
cases too large and in other cases too small. To help resolve this issue we
selected four stars for which there are well determined equivalent widths in
regions with moderate line blending. As we found that 
contained lines of some important atomic species for middle B
to early A stars, we also choose stars for which we could extend published
studies.
The Mercury-Manganese (HgMn) stars 
Leporis (= HD 33904 = HR 1702) and 28
Herculis (= HD 149121 = HR 6158) were most recently analyzed by
Adelman (1987) and (1988), respectively. Their apparent
rotational velocities are 18 and 
, respectively. An
effective temperature of 12500 K and surface gravity, 
, of
Lep was derived by comparing spectrophotometry and the 
profile with the predictions of ATLAS6 (Kurucz 1979) model
atmospheres. For 28 Her, the values 
, 
were found using 
photometry and the
profile.
The A0 V star 7 Sex (= HD 85504 = HR 3906) (
)
has nearly solar abundances, but the space motions of a Population II
object. The recent analysis by Adelman & Philip (1996) used
the homogeneous colors of Hauck & Mermilliod
(1980) with the calibration of Napiwotzki et al.
(1993) to find 
, 
. They
compared a Kitt Peak National Observatory (KPNO) CCD spectrogram centered
at with the predictions of ATLAS9 solar composition models
(Kurucz 1993) by employing SYNTHE (Kurucz & Avrett
1981) to calculate a 200 Å wide spectral region centered at 4340
Å to confirm the surface gravity.
The HgMn star HR 4817 (= HD 110073) (
) was
most recently studied by Adelman & Philip (1994). Using
photometry as for 7 Sex, these investigators found 
,
. In many respects it is similar to the peculiar HgMn star 53
Tau, but it is one of the most He normal members of its class.
For 7 Sex and HR 4817, we could not improve determination of effective
temperature and surface gravity. But for Lep and 28 Her 20.4
DAO Reticon spectrograms containing the
profile were obtained. When we compared spectrophotometry and the
profile with the predictions of ATLAS9 model atmospheres we
found for Lep 
, 
for both solar and +[0.2]
enhanced models, which are slightly different from those of Adelman
(1987). For 28 Her, we used photometry and the
calibration of Napiwotzki et al. (1993) to find 
, 
. As the predicted profile of a
10900 K, 
solar composition ATLAS9 model agreed with the
observations, we adopted this model which means 28 Her is slightly hotter
and has a slightly greater surface gravity than found by Adelman
(1988). Allowing for the differences in helium abundances between
the models and the stars (see below), 
for Lep and
3.96 for 28 Her.