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A SPECTRAL ATLAS OF lambda BOOTIS STARS
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
2014 (English)In: Serbian Astronomical Journal, ISSN 1450-698X, Vol. 188, 75-84 p.Article in journal (Refereed) Published
Abstract [en]

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 angstrom mm(-1)) 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 angstrom mm(-1)) spectrum of one "classical" lambda Bootis star in the same wavelength region (3800 - 4600 angstrom) 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).

Place, publisher, year, edition, pages
2014. Vol. 188, 75-84 p.
Keyword [en]
atlases, stars: chemically peculiar, stars: fundamental parameters
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-231465DOI: 10.2298/SAJ1488075PISI: 000340034400008OAI: oai:DiVA.org:uu-231465DiVA: diva2:744614
Available from: 2014-09-08 Created: 2014-09-08 Last updated: 2017-12-05Bibliographically approved

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Heiter, Ulrike

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