Toward Understanding the Formation of Molecular Clouds |
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| Authors: | Shu-ichiro Inutsuka Hiroshi Koyama |
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| Institution: | 1. Niels Bohr Institute for Astronomy, Physics and Geophysics, Juliane Maries Vej 30, DK-2100, Copenhagen ?, Denmark
2. Department of Physics & Astronomy, University of Wisconsin Oshkosh, 800 Algoma Blvd., Oshkosh, WI, 54901-8644, USA
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| Abstract: | Based on a comparison of similar colour indices we investigate the effects of luminosity and metallicity that influence the Strömgren and Vilnius photometric quantities for different spectral types. We notice significant differences for similar indices, apparently due to small deviations of central wavelengths and band-widths of the filters. For the G-K type stars of moderate luminosity we interpret the difference introduced by v and X pass-bands as an log g effect, reflecting the presence of H&;K Ca II stellar lines in these spectral types. We discuss a possible influence of the H&;K Ca II lines on the luminosities derived from the Vilnius classification diagrams. |
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| Keywords: | molecular clouds thermal instability supernova remnants shock waves |
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