Stars with discrepant υ sin i as derived from Ca II 3933 and Mg II 4481 Å lines. II. Multiple ... View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2012-01

AUTHORS

J. Zverko, I. Iliev, I. Romanyuk, I. Barzova, D. Kudryavtsev, I. Stateva, E. Semenko

ABSTRACT

Axial rotation of a star plays an important role in its evolution, physical condition in its atmosphere and appearance of its spectrum. Methods of determinations of υ sin i are based on comparison of the observed profiles of spectral lines with theoretical ones. Their accuracy depends on the kind and quality of spectrograms as well as on the algorithms used. A frequently used method is the simple comparing of one line, e.g. the Ca II at 3933 Å or Mg ii at 4481 Å. This however, may result in a false value of υ sin i if low dispersion spectra are used. In this work we studied contemporary CCD as well as older photographic spectra of the multiple star HD90569. We determined the projected rotational velocity value to be υ sin i = 11 km/s. Besides formerly reported enhancing of lines of Cr, Fe, Mn and Sr, we found also large overabundances of rare earths, gallium and platinum. Helium, carbon, nitrogen, oxygen, aluminium, calcium, scandium and nickel are in deficit. The spectrum of the occultation double was not identified to be of the SB2-type, however, there are some observable evidences that the pair creates a binary with a long orbital period. Despite this there are also observations that leave such interpretation uncertain. More... »

PAGES

57-66

References to SciGraph publications

  • 1987-12. Experiments with CP stars in JOURNAL OF ASTROPHYSICS AND ASTRONOMY
  • 2011-07. Stars with discrepant v sin i as derived from Ca II 3933 and Mg II 4481 Å lines. I. Composite-spectrum star HD 2913 in ASTROPHYSICAL BULLETIN
  • 1982-10. Close binary systems before and after mass transfer in ASTROPHYSICS AND SPACE SCIENCE
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1134/s1990341312010051

    DOI

    http://dx.doi.org/10.1134/s1990341312010051

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1019255805


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