The D/H Ratio in Interstellar Gas Toward gamma (2) Velorum and zeta Puppis

Details The D/H Ratio in Interstellar Gas Toward gamma (2) Velorum and zeta Puppis The D/H Ratio in Interstellar Gas Toward gamma (2) Velorum and zeta Puppis

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.6516s&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #65.16; Bulletin of the American Astronomical Society, Vol. 30, p.1342

Astronomy and Astrophysics

Astronomy

Scientific paper

High resolution far ultraviolet spectra of the early-type stars zeta Puppis, and gamma (2) Velorum were obtained with the Interstellar Medium Absorption Profile Spectrograph (IMAPS) during the 16-day ORFEUS-SPAS II mission in 1996 November. The IMAPS spectra cover the wavelength range ~ 930--1150 Angstroms with a spectral resolution of 4 km/sec (FWHM). High-quality spectra for these stars were obtained at Ly-delta (949 Angstroms) and Ly-epsilon (937 Angstroms) where the interstellar D I features are resolved, unsaturated, and cleanly separated from interstellar H I. The D I profiles were modeled using a velocity template derived from several N I lines in the IMAPS spectra. We minimized the chi (2) for model D I profiles that included not only the D I column density but also the effects of several sources of systematic error which were allowed to vary as free parameters. The analysis to date finds N(D I) =1.10 x 10(15) cm(-2) for gamma (2) Velorum and N(D I) =1.45 x 10(15) cm(-2) for zeta Puppis. For N(H I) we used the same chi (2) -minimization technique to analyze the Ly-alpha absorption profiles in ~ 15 IUE SWP high dispersion spectra for each of these stars. We find N(H I) =5.18+/- 0.43 x 10(19) cm(-2) for gamma (2) Velorum and N(H I) =8.66+/- 0.48 x 10(19) cm(-2) for zeta Puppis. This yields D/H =2.12 x 10(-5) for gamma (2) Velorum and 1.67 x 10(-5) for zeta Puppis. An evaluation of the errors and uncertainties will be presented.

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