Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...210..143y&link_type=abstract
Astrophysical Journal, vol. 210, Nov. 15, 1976, pt. 1, p. 143-152.
Astronomy and Astrophysics
Astrophysics
9
Eclipsing Binary Stars, H Lines, Stellar Envelopes, Stellar Spectra, Ultraviolet Spectroscopy, Atomic Spectra, Balmer Series, Fine Structure, H I Regions, H Ii Regions, Interstellar Gas, Oso-3, Tables (Data)
Scientific paper
Results are reported for Copernicus observations of the double-lined binary V Puppis in the wavelength region from 1155 to 1310 A with a resolution of 0.2 A. The sharp-lined UV absorption spectrum is found to provide a line of sight dominated by an apparently 'textbook' H II region in a Stromgren sphere surrounding the stars. Several characteristics of this H II region are deduced by analyzing absorption features arising from excited fine-structure states of N II and Si II. Evidence is given for the presence of a normal interstellar H I region containing H2 and a separate H I region which could be the transition zone of the H II region. A possible blueshifted N V feature is noted in absorption. It is suggested that the H(+) emission measure and a characteristic size and shape for the H II region can probably be determined by optical observations of Balmer recombination lines within about 1 deg of V Puppis.
Bahcall John
Flannery B.
York Don G.
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