Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...335l..23d&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 335, Dec. 1, 1988, p. L23-L26.
Astronomy and Astrophysics
Astrophysics
18
Astronomical Spectroscopy, Interstellar Gas, Planetary Nebulae, Sodium, Stellar Envelopes, Stellar Spectra, Continuous Radiation, Interstellar Extinction, Light Scattering, Spectral Resolution
Scientific paper
The authors report the detection of resonance D lines of Na I (λλ5890, 5895) formed in neutral material around the planetary nebula BD +30°3639. The circumstellar absorptions, seen against the continuum of the central star, have the same radial velocity as the blue edge of the expanding shell of ionized gas, -67 km s-1. At the spectral resolution of 10 km s-1, the circumstellar features are well separated from low-velocity features due to foreground interstellar material. Applying the doublet-ratio method, the authors infer the circumstellar column density of Na I toward the central star. At positions on the nebula located away from the central star, the authors see the reemerging sodium D photons as emission lines at the systemic nebular velocity of -31 km s-1.
Dinerstein Harriet L.
Sneden Christopher
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