Emission-line widths in the spectrum of the possible proto-planetary nebula HM Sagittae

Details Emission-line widths in the spectrum of the possible proto-planetary nebula HM Sagittae Emission-line widths in the spectrum of the possible proto-planetary nebula HM Sagittae

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pasp...90...36w&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 90, Feb.-Mar. 1978, p. 36-38.

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32

Astronomical Spectroscopy, Emission Spectra, Line Spectra, Planetary Nebulae, Spectral Line Width, Gas Expansion, H Alpha Line, Nitrogen, Radial Velocity, Stellar Envelopes, Stellar Evolution, Visual Observation

Scientific paper

We have observed the new emission-line object HM Sge in the region of lambda 6200 to lambda 6700 at 6 A mm to the -1. The line profiles show a huge disparity in width ranging from 35 km sec to the -1 for N II to 1700 km sec to the -1 for H alpha. We suggest the interpretation that the great width of H alpha is due to electron scattering in the central source while most of the other lines are broadened kinematically as part of the expanding planetary nebula. The very narrow N II lines may be formed in a larger region that was formerly the expanding envelope of a cool star.

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