000003736 001__ 3736
000003736 005__ 20190114153613.0
000003736 0247_ $$2DOI$$a10.3847/1538-4357/aaa246
000003736 037__ $$aSCART-2019-0020
000003736 100__ $$aMonier, R. 
000003736 245__ $$aHR 8844: A New Transition Object between the Am Stars and the HgMn Stars?
000003736 260__ $$c2018
000003736 520__ $$aWhile monitoring a sample of apparently slowly rotating superficially normal early-A stars, we have discovered that HR 8844 (A0 V) is actually a new chemically peculiar star. We first compared the high-resolution spectrum of HR 8844 with that of four slow rotators near A0V (ν Cap, ν Cnc, Sirius A, and HD 72660) to highlight similarities and differences. The lines of Ti II, Cr II, Sr II, and Ba II are conspicuous features in the high-resolution high signal-to-noise SOPHIE spectra of HR 8844 and much stronger than in the spectra of the normal star ν Cap. The Hg II line at 3983.93 Å is also present in a 3.5% blend. Selected unblended lines of 31 chemical elements from He up to Hg have been synthesized using model atmospheres computed with ATLAS9 and the spectrum synthesis code SYNSPEC48 including hyperfine structure of various isotopes when relevant. These synthetic spectra have been adjusted to the mean SOPHIE spectrum of HR 8844, and high-resolution spectra of the comparison stars. Chi-squares were minimized to derive abundances or upper limits to the abundances of these elements for HR 8844 and the comparison stars. HR 8844 is found to have underabundances of He, C, O, Mg, Ca, and Sc, mild enhancements of Ti, V, Cr, Mn, and distinct enhancements of the heavy elements Sr, Y, Zr, Ba, La, Pr, Sm, Eu, and Hg, the overabundances increasing steadily with atomic number. This chemical pattern suggests that HR 8844 may actually be a new transition object between the coolest HgMn stars and the Am stars.
000003736 594__ $$aNO
000003736 6531_ $$astars: abundances, stars: chemically peculiar, stars: early-type, stars: individual: HR 8844
000003736 700__ $$aGebran, M. 
000003736 700__ $$aRoyer, F. 
000003736 700__ $$aKilicoglu, T. 
000003736 700__ $$aFrémat, Y.
000003736 773__ $$c1-28$$n50$$pAstrophysical Journal$$v854$$y2018
000003736 8560_ $$fyves.fremat@observatoire.be
000003736 85642 $$ahttp://cdsads.u-strasbg.fr/cgi-bin/nph-data_query?bibcode=2018ApJ...854...50M&link_type=ARTICLE&db_key=AST&high=
000003736 905__ $$apublished in
000003736 980__ $$aREFERD