The SDSS/APOGEE Catalog of HgMn Stars
S. Drew Chojnowski, Swetlana Hubrig, Sten Hasselquist, Rachael L., Beaton, Steven R. Majewski, D.A. Garcia-Hernandez, David DeColibus

TL;DR
This paper presents a large catalog of newly identified HgMn stars from the SDSS/APOGEE survey, revealing their binary nature, spectral features, and expanding the known sample significantly.
Contribution
It provides the first extensive H-band spectral catalog of HgMn stars, doubling the known number and analyzing their binary properties and spectral peculiarities.
Findings
Identified 260 new HgMn stars, increasing the known sample size.
Discovered that at least 32% are in binary or multiple systems.
Found that about half show narrow emission lines matching Mn II lines.
Abstract
We report on -band spectra of chemically peculiar Mercury-Manganese (HgMn) stars obtained via the SDSS/APOGEE survey. As opposed to other varieties of chemically peculiar stars such as classical Ap/Bp stars, HgMn stars lack strong magnetic fields and are defined by extreme overabundances of Mn, Hg, and other heavy elements. A satisfactory explanation for the abundance patterns remains to be determined, but low rotational velocity is a requirement and involvement in binary/multiple systems may be as well. The APOGEE HgMn sample currently consists of 269 stars that were identified among the telluric standard stars as those whose metallic absorption content is limited to or dominated by the -band Mn II lines. Due to the fainter magnitudes probed by the APOGEE survey as compared to past studies, only 9/269 stars in the sample were previously known as HgMn types. The 260…
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