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
Article
Monier, Richard, Niemczura, E., Kurtz, D., Rappaport, S., Bowman, D. M., Murphy, Simon J., Lebreton, Yveline, Stuik, Remko, Deal, Morgan, Merle, Thibault, Kılıçoğlu, T., Gebran, M. and Le Ster, Ewen. 2023. "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. 166 (2). https://doi.org/10.3847/1538-3881/acdb50
| Article 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 |
|---|---|
| ERA Journal ID | 1048 |
| Article Category | Article |
| Authors | Monier, Richard, Niemczura, E., Kurtz, D., Rappaport, S., Bowman, D. M., Murphy, Simon J., Lebreton, Yveline, Stuik, Remko, Deal, Morgan, Merle, Thibault, Kılıçoğlu, T., Gebran, M. and Le Ster, Ewen |
| Journal Title | The Astronomical Journal |
| Journal Citation | 166 (2) |
| Article Number | 54 |
| Number of Pages | 19 |
| Year | 2023 |
| Publisher | IOP Publishing |
| Place of Publication | United States |
| ISSN | 0004-6256 |
| 1538-3881 | |
| Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/acdb50 |
| Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/acdb50 |
| Abstract | 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 Porb = 26.12022 ± 0.00004 day. |
| Keywords | Eclipsing binary stars ; Chemically peculiar stars |
| ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
| Byline Affiliations | Pierre and Marie Curie University, France |
| University of Wroclaw, Poland | |
| North-West University, South Africa | |
| University of Central Lancashire, United Kingdom | |
| MIT Kavli Institute for Astrophysics and Space Research, United States | |
| Institute of Atronomy, Belgium | |
| School of Mathematics, Physics and Computing | |
| University of Rennes, France | |
| Leiden University, Netherlands | |
| University of Porto, Portugal | |
| Free University of Brussels, Belgium | |
| Ankara University, Turkiye | |
| Saint Mary's College of California, United States |
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