Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...252l..17h&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 252, Jan. 1, 1982, p. L17-L20.
Astronomy and Astrophysics
Astrophysics
31
B Stars, Binary Stars, Interstellar Matter, K Lines, Stellar Spectra, Supernova Remnants, Abundance, Calcium, Grain Boundaries, Nitrogen, Periodic Variations, Radial Velocity, Sodium, Spectral Line Width, Stellar Evolution, Vapor Phases
Scientific paper
New high dispersion observations are reported of the very strong, broad interstellar K line of Ca II in the spectrum of HD 72127A, a star located near a filament of the Vela supernova remnant. When compared with similar observations made in 1977, the new data reveal temporal variability of the interstellar absorption, as shown both by the presence of a new, sixth line component and by a 25% increase in the total equivalent width of the K line. All five Ca II components which were seen in both years show very large column-density ratios N(Ca II) /N(Na I) at least equal to 9, probably arising from anomalously large interstellar gas-phase abundances of Ca caused by disruption of interstellar grains. Marked differences in the structure of the K line between the two early-type components of this binary star, which are separated by only 3000 AU, are confirmed.
Hobbs Lew M.
Hu Esther M.
Wallerstein George
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