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Title: The SDSS/APOGEE catalogue of HgMn stars

Abstract

ABSTRACT We report on H-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 H-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 newly identified HgMn stars represents a more than doubling of the known sample. At least 32 per cent of the APOGEE sample are found to be binary or multiple systems, and from multi-epoch spectroscopy, we were able to determine orbital solutions for at least one component in 32 binaries. Many of the multilined systems include chemically peculiar companions, with noteworthy examples being themore » HgMn+Ap/Bp binary HD 5429, the HgMn+HgMn binary HD 298641, and the HgMn+Bp Mn + Am triple system HD 231263. As a further peculiarity, roughly half of the sample produces narrow emission in the C i 16895 Å line, with widths and radial velocities that match those of the Mn ii lines.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [1]
  1. Apache Point Observatory and New Mexico State University, PO Box 59, Sunspot, NM 88349-0059, USA
  2. Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany
  3. Department of Physics and Astronomy, University of Utah, 115 1400 E, Salt Lake City, UT 84112, USA
  4. The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA
  5. Department of Astronomy, University of Virginia, PO Box 400325, Charlottesville, VA 22904-4325, USA
  6. Instituto de Astrofísica de Canarias (IAC), E-38205 La Laguna, Tenerife, Spain, Departamento de Astrofísica, Universidad de La Laguna (ULL), E-38206 La Laguna, Tenerife, Spain
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1633942
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 496 Journal Issue: 1; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Chojnowski, S. Drew, Hubrig, Swetlana, Hasselquist, Sten, Beaton, Rachael L., Majewski, Steven R., García-Hernández, D. A., and DeColibus, David. The SDSS/APOGEE catalogue of HgMn stars. United Kingdom: N. p., 2020. Web. doi:10.1093/mnras/staa1527.
Chojnowski, S. Drew, Hubrig, Swetlana, Hasselquist, Sten, Beaton, Rachael L., Majewski, Steven R., García-Hernández, D. A., & DeColibus, David. The SDSS/APOGEE catalogue of HgMn stars. United Kingdom. doi:https://doi.org/10.1093/mnras/staa1527
Chojnowski, S. Drew, Hubrig, Swetlana, Hasselquist, Sten, Beaton, Rachael L., Majewski, Steven R., García-Hernández, D. A., and DeColibus, David. Wed . "The SDSS/APOGEE catalogue of HgMn stars". United Kingdom. doi:https://doi.org/10.1093/mnras/staa1527.
@article{osti_1633942,
title = {The SDSS/APOGEE catalogue of HgMn stars},
author = {Chojnowski, S. Drew and Hubrig, Swetlana and Hasselquist, Sten and Beaton, Rachael L. and Majewski, Steven R. and García-Hernández, D. A. and DeColibus, David},
abstractNote = {ABSTRACT We report on H-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 H-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 newly identified HgMn stars represents a more than doubling of the known sample. At least 32 per cent of the APOGEE sample are found to be binary or multiple systems, and from multi-epoch spectroscopy, we were able to determine orbital solutions for at least one component in 32 binaries. Many of the multilined systems include chemically peculiar companions, with noteworthy examples being the HgMn+Ap/Bp binary HD 5429, the HgMn+HgMn binary HD 298641, and the HgMn+Bp Mn + Am triple system HD 231263. As a further peculiarity, roughly half of the sample produces narrow emission in the C i 16895 Å line, with widths and radial velocities that match those of the Mn ii lines.},
doi = {10.1093/mnras/staa1527},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 496,
place = {United Kingdom},
year = {2020},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
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DOI: https://doi.org/10.1093/mnras/staa1527

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