The Surface Composition of Six Newly Discovered Chemically Peculiar Stars. Comparison to the HgMn Stars mu Lep and beta Scl and the Superficially Normal B Star nu Cap
We report on a detailed abundance study of six bright, mostly southern, slowly rotating late B-stars: HD 1279 (B8III), HD 99803 (B9V), HD 123445 (B9V), HD 147550 (B9V), HD 171961 (B8III), and HD 202671 (B5II/III), hitherto reported as normal stars. We compare them to the two classical HgMn stars μ L...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astronomical Journal |
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| Online Access: | https://doi.org/10.3847/1538-3881/acdb50 |
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| author | Richard Monier E. Niemczura D. W. Kurtz S. Rappaport D. M. Bowman Simon J. Murphy Yveline Lebreton Remko Stuik Morgan Deal Thibault Merle T. Kılıçoğlu M. Gebran Ewen Le Ster |
| author_facet | Richard Monier E. Niemczura D. W. Kurtz S. Rappaport D. M. Bowman Simon J. Murphy Yveline Lebreton Remko Stuik Morgan Deal Thibault Merle T. Kılıçoğlu M. Gebran Ewen Le Ster |
| author_sort | Richard Monier |
| collection | DOAJ |
| description | We report on a detailed abundance study of six bright, mostly southern, slowly rotating late B-stars: HD 1279 (B8III), HD 99803 (B9V), HD 123445 (B9V), HD 147550 (B9V), HD 171961 (B8III), and HD 202671 (B5II/III), hitherto reported as normal stars. We compare them to the two classical HgMn stars μ Lep and β Scl, and to the superficially normal star ν Cap. In the spectra of the six stars, the Hg ii line at 3984 Å line is clearly seen and numerous lines of P, Ti, Mn, Fe, Ga, Sr, Y, and Zr appear to be strong absorbers. A comparison of newly acquired and archival spectra of these objects with a grid of synthetic spectra for selected unblended lines reveals large overabundances of P, Ti, Cr, Mn, Sr, Y, Zr, Ba, Pt, and Hg, and underabundances of He, Mg, Sc, and Ni. The effective temperatures, surface gravities, low projected rotational velocities, and the peculiar abundance patterns of the six investigated stars show that they are new chemically peculiar stars, mostly new HgMn stars, and are reclassified as such. The evolutionary status of these stars has been inferred, and their ages and masses estimated. The two most massive objects, HD 1279 and HD 202671, might have evolved away from the main sequence recently, the other stars are main-sequence objects. HD 99803A is a sharp lined HgMn star with grazing eclipses. From TESS and MASCARA photometry, we determine an orbital period of P _orb = 26.12022 ± 0.00004 day. |
| first_indexed | 2024-03-12T02:59:15Z |
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| id | doaj.art-92d1b0681b50497681ece8c7ae23af1c |
| institution | Directory Open Access Journal |
| issn | 1538-3881 |
| language | English |
| last_indexed | 2024-03-12T02:59:15Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astronomical Journal |
| spelling | doaj.art-92d1b0681b50497681ece8c7ae23af1c2023-09-03T15:02:01ZengIOP PublishingThe Astronomical Journal1538-38812023-01-0116625410.3847/1538-3881/acdb50The Surface Composition of Six Newly Discovered Chemically Peculiar Stars. Comparison to the HgMn Stars mu Lep and beta Scl and the Superficially Normal B Star nu CapRichard Monier0https://orcid.org/0000-0002-0735-5512E. Niemczura1D. W. Kurtz2https://orcid.org/0000-0002-1015-3268S. Rappaport3https://orcid.org/0000-0003-3182-5569D. M. Bowman4https://orcid.org/0000-0001-7402-3852Simon J. Murphy5https://orcid.org/0000-0002-5648-3107Yveline Lebreton6https://orcid.org/0000-0002-4834-2144Remko Stuik7https://orcid.org/0000-0001-7797-3749Morgan Deal8https://orcid.org/0000-0001-6774-3587Thibault Merle9T. Kılıçoğlu10https://orcid.org/0000-0001-6947-822XM. Gebran11https://orcid.org/0000-0002-8675-4000Ewen Le Ster12LESIA, UMR 8109, Observatoire de Paris et Université Pierre et Marie Curie Sorbonne Universités , place J. Janssen, Meudon, France ; Richard.Monier@obspm.frUniversity of Wroclaw , Astronomical Institute, Kopernika 11, PL-51-622, Wroclaw, PolandDepartment of Physics, North-West University , Dr Albert Luthuli Drive, Mahikeng 2735, South Africa; Jeremiah Horrocks Institute, University of Central Lancashire , Preston, PR1 2HE, UKDepartment of Physics, Kavli Institute for Astrophysics and Space Research , M.I.T., Cambridge, MA 02139, USAInstitute of Atronomy, KU Leuwen, Celestijnenlaan 200D, B-3001 Leuven, BelgiumUniversity of Southern Queensland , Centre for Astrophysics, West Street, Toowoomba, QLD 4350 AustraliaLESIA, UMR 8109, Observatoire de Paris et Université Pierre et Marie Curie Sorbonne Universités , place J. Janssen, Meudon, France ; Richard.Monier@obspm.fr; Univ Rennes , CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000 Rennes, FranceLeiden Observatory, Leiden University , Niels Bohrweg 2, 2300 RA, Leiden, The NetherlandsInstituto de Astrofísica e Ciências do Espaço, Universidade do Porto , CAUP, Rua das Estrelas, PT4150-762 Porto, PortugalInstitut d’astronomie et d’astrophysique, Université Libre de Bruxelles , CP. 226, Boulevard du Triomphe, B-1050 Brussels, BelgiumDepartment of Astronomy and Space Sciences, Faculty of Science, Ankara University , 06100, TurkeyDepartment of Chemistry and Physics, Saint Mary’s College , Notre Dame, IN 46556, USAUniv Rennes , CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000 Rennes, FranceWe report on a detailed abundance study of six bright, mostly southern, slowly rotating late B-stars: HD 1279 (B8III), HD 99803 (B9V), HD 123445 (B9V), HD 147550 (B9V), HD 171961 (B8III), and HD 202671 (B5II/III), hitherto reported as normal stars. We compare them to the two classical HgMn stars μ Lep and β Scl, and to the superficially normal star ν Cap. In the spectra of the six stars, the Hg ii line at 3984 Å line is clearly seen and numerous lines of P, Ti, Mn, Fe, Ga, Sr, Y, and Zr appear to be strong absorbers. A comparison of newly acquired and archival spectra of these objects with a grid of synthetic spectra for selected unblended lines reveals large overabundances of P, Ti, Cr, Mn, Sr, Y, Zr, Ba, Pt, and Hg, and underabundances of He, Mg, Sc, and Ni. The effective temperatures, surface gravities, low projected rotational velocities, and the peculiar abundance patterns of the six investigated stars show that they are new chemically peculiar stars, mostly new HgMn stars, and are reclassified as such. The evolutionary status of these stars has been inferred, and their ages and masses estimated. The two most massive objects, HD 1279 and HD 202671, might have evolved away from the main sequence recently, the other stars are main-sequence objects. HD 99803A is a sharp lined HgMn star with grazing eclipses. From TESS and MASCARA photometry, we determine an orbital period of P _orb = 26.12022 ± 0.00004 day.https://doi.org/10.3847/1538-3881/acdb50Eclipsing binary starsChemically peculiar stars |
| spellingShingle | Richard Monier E. Niemczura D. W. Kurtz S. Rappaport D. M. Bowman Simon J. Murphy Yveline Lebreton Remko Stuik Morgan Deal Thibault Merle T. Kılıçoğlu M. Gebran Ewen Le Ster The Surface Composition of Six Newly Discovered Chemically Peculiar Stars. Comparison to the HgMn Stars mu Lep and beta Scl and the Superficially Normal B Star nu Cap The Astronomical Journal Eclipsing binary stars Chemically peculiar stars |
| title | The Surface Composition of Six Newly Discovered Chemically Peculiar Stars. Comparison to the HgMn Stars mu Lep and beta Scl and the Superficially Normal B Star nu Cap |
| title_full | The Surface Composition of Six Newly Discovered Chemically Peculiar Stars. Comparison to the HgMn Stars mu Lep and beta Scl and the Superficially Normal B Star nu Cap |
| title_fullStr | The Surface Composition of Six Newly Discovered Chemically Peculiar Stars. Comparison to the HgMn Stars mu Lep and beta Scl and the Superficially Normal B Star nu Cap |
| title_full_unstemmed | The Surface Composition of Six Newly Discovered Chemically Peculiar Stars. Comparison to the HgMn Stars mu Lep and beta Scl and the Superficially Normal B Star nu Cap |
| title_short | The Surface Composition of Six Newly Discovered Chemically Peculiar Stars. Comparison to the HgMn Stars mu Lep and beta Scl and the Superficially Normal B Star nu Cap |
| title_sort | surface composition of six newly discovered chemically peculiar stars comparison to the hgmn stars mu lep and beta scl and the superficially normal b star nu cap |
| topic | Eclipsing binary stars Chemically peculiar stars |
| url | https://doi.org/10.3847/1538-3881/acdb50 |
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