Four new HgMn stars: HD 18104, HD 30085, HD 32867, HD 53588

Abstract

We have detected four new HgMn stars, while monitoring a sample of apparently slowly rotating superficially normal bright late B and early A stars in the northern hemisphere. Important classification lines of Hg II and Mn II are found as conspicuous features in the high resolution SOPHIE spectra of these stars (R = 75000). Several lines of Hg II, Mn II and Fe II have been synthesized using model atmospheres and the spectrum synthesis code SYNSPEC48 including hyperfine structure of various isotopes when relevant. These synthetic spectra have been compared to high resolution high signal-to-noise observations of these stars in order to derive abundances of these key elements. The four stars are found to have distinct enhancements of Hg and Mn which show that these stars are not superficially normal B and A stars, but actually are new HgMn stars and should reclassified as such.

arXiv comment4 pages, 3 figures, accepted in A&A

References in corpus (4)

• A Stellar Rotation Census of B Stars: from ZAMS to TAMS
• POLLUX : a database of synthetic stellar spectra
• Magnetic fields of HgMn stars
• Normal A0--A1 stars with low rotational velocities. I. Abundance determination and classification

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• HR 8844: a new transition object between the Am stars and the HgMn stars ?
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• The nature of the late B-type stars HD 67044 and HD 42035