A SPECTRAL ATLAS OF lambda BOOTIS STARS

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Publikace nespadá pod Ekonomicko-správní fakultu, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
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PAUNZEN Ernst HEITER Ulrike

Rok publikování 2014
Druh Článek v odborném periodiku
Časopis / Zdroj SERBIAN ASTRONOMICAL JOURNAL
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Doi http://dx.doi.org/10.2298/SAJ1488075P
Obor Astronomie a nebeská mechanika, astrofyzika
Klíčová slova atlases; stars: chemically peculiar; stars: fundamental parameters
Popis AB Since the discovery of lambda Bootis stars, a permanent confusion about their classification can be found in literature. This group of non-magnetic, Population I, metal-poor A to F-type stars, has often been used as some sort of trash can for "exotic" and spectroscopically dubious objects. Some attempts have been made to establish a homogeneous group of stars which share the same common properties. Unfortunately, the flood of "new" information (e.g. UV and IR data) led again to a whole zoo of objects classified as lambda Bootis stars, which, however, are apparent non-members. To overcome this unsatisfying situation, a spectral atlas of well established lambda Bootis stars for the classical optical domain was compiled. It includes intermediate dispersion (40 and 120 Angstroem/mm) spectra of three lambda Bootis, as well as appropriate MK standard stars. Furthermore, "suspicious" objects, such as shell and Field Horizontal Branch stars, have been considered in order to provide to classifiers a homogeneous reference. As a further step, a high resolution (8 Angstroem/mm) spectrum of one "classical" lambda Bootis star in the same wavelength region (3800 - 4600 Angstroem) is presented. In total, 55 lines can be used for this particular star to derive detailed abundances for nine heavy elements (Mg, Ca, Sc, Ti, Cr, Mn, Fe, Sr and Ba).
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