Elemental abundance analyses with DAO spectrograms^*

XXIV. The Mercury Manganese stars υ Her, ϕ Her, and HR 7018

¹ Department of Physics, The Citadel, 171 Moultrie Street, Charleston, SC 29409, USA
² Guest Investigator, Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council of Canada, 5071 W. Saanich Road, Victoria V8X 4M6, Canada
³ Department of Physics, Brandon University, Brandon, MB R7A 6A9, Canada

Corresponding author: Saul J. Adelman, adelmans@citadel.edu

Received: 16 October 2000
Accepted: 29 November 2000

Abstract

Elemental abundances analyses are performed for the Mercury-Manganese stars υ Her, ϕ Her, and HR 7018 consistent with previous studies of this series using spectrograms obtained with Reticon and CCD detectors. Comparisons of the first two analyses with those performed using coadded photographic plates show the general consistency of the derived elemental abundances. For υ Her and for ϕ Her, abundances were newly found for O, and for Al, V, Zn, and Ce, respectively. HR 7018 is discovered to be a single-lined spectroscopic binary. Its Sc abundance is the smallest of any class member with derived abundances and its Sr abundance the largest of any known HgMn star. A correlation analysis of the most complete abundance sets for 20 HgMn stars shows that the abundances of some elements are correlated with one another and some are functions of the stellar effective temperature.