DETERMINATION OF INTERSTELLAR ABSORPTION IN SA 19 USING LOW-DISPERSION SPECTRA,
OSLO UNIV (NORWAY) INST OF THEORETICAL ASTROPHYSICS
Pagination or Media Count:
Densities in spectra of stars in Kapteyns Selected Area No. 19 taken with a Schmidt camera are measured and correlated with the corresponding monochromatic magnitudes in Elvius reference catalogue 1951. An analytical expression for the calibration curve is found. Line parameters for 84 stars are determined and the stars are classified according to the Uppsala spectral classification system. Their colors and absolute magnitudes are also calculated. The color excess as a function of distance is then determined and the absorption out to 2 kpc is found. Author Their colors and absolute magnitudes are also calculated.