Sj. Adelman et al., ELEMENTAL ABUNDANCES OF THE MERCURY-MANGANESE STARS HR-89 AND HR-33 GEMINORUM, Monthly Notices of the Royal Astronomical Society, 282(3), 1996, pp. 953-957
Using ATLAS9 model atmospheres and two spectrograms each of the mercur
y-manganese stars HR 89 and 33 Geminorum obtained with a 3 kpixel long
CCD, camera 5 and grating A at the Kitt Peak National Observatory cou
de feed telescope, we derive the elemental abundances of these stars.
Both are extraordinary objects with Mn abundances similar to those of
Fe and marked He deficiencies. 33 Gem is the hottest known HgMn star.