Volume 553, May 2013
|Number of page(s)||16|
|Published online||25 April 2013|
Chemical surface inhomogeneities in late B-type stars with Hg and Mn peculiarity
Niels Bohr Institute, University of Copenhagen,
Juliane Maries Vej 30,
2 Centre for Star and Planet Formation, Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5-7, 1350 Copenhagen, Denmark
3 Finnish Centre for Astronomy with ESO (FINCA), University of Turku, Väisäläntie 20, 21500 Piikkiö, Finland
4 Instituto de Ciencias Astronomicas, de la Tierra, y del Espacio (ICATE), 5400 San Juan, Argentina
5 Institut d’Astrophysique et de Géophysique, Université de Liège, Allée du 6 août 17, Sart-Tilman, Bât. B5C, 4000 Liège, Belgium
6 Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, 3001 Leuven, Belgium
7 Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany
8 Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya 48, 119017 Moscow, Russia
9 Department of Physics, PO Box 64, 00014 University of Helsinki, Finland
Received: 18 December 2012
Accepted: 4 February 2013
Aims. Time series of high-resolution spectra of the late B-type star HD 11753 exhibiting HgMn chemical peculiarity are used to study the surface distribution of different chemical elements and their temporal evolution.
Methods. High-resolution and high signal-to-noise ratio spectra were obtained using the CORALIE spectrograph at La Silla in 2000, 2009, and 2010. Surface maps of Y ii, Sr ii, Ti ii, and Cr ii were calculated using the Doppler imaging technique. The results were also compared to equivalent width measurements. The evolution of chemical spots both on short and long time scales were investigated.
Results. We determine the binary orbit of HD 11753 and fine-tune the rotation period of the primary. The earlier discovered fast evolution of the chemical spots is confirmed by an analysis using both the chemical spot maps and equivalent width measurements. In addition, a long-term decrease in the overall Y ii and Sr ii abundances is discovered. A detailed analysis of the chemical spot configurations reveals some possible evidence that a very weak differential rotation is operating in HD 11753.
Key words: stars: abundances / stars: chemically peculiar / stars: individual: HD 11753 / stars: variables: general
Based on observations obtained with the CORALIE Échelle Spectrograph on the 1.2-m Euler Swiss telescope, situated at La Silla, Chile; based on observations made with ESO Telescopes at the La Silla Paranal Observatory under programmes 076.D-0172 and 077.D-0477; and based on data obtained from the ESO Science Archive Facility under request number HHKorhonen15448.
Table 2 is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (126.96.36.199) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/553/A27
Table 1 and Figs. 12–19, 22, and 23 are available in electronic form at http://www.aanda.org
© ESO, 2013
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