High-resolution observations of H-alpha emission line from R Aquarii

Details High-resolution observations of H-alpha emission line from R Aquarii High-resolution observations of H-alpha emission line from R Aquarii

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.114..351a&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 114, no. 2, Sept. 1985, p. 351-356. Research supported by the Department o

Astronomy and Astrophysics

Astrophysics

4

Emission Spectra, H Alpha Line, High Resolution, Stellar Mass Ejection, Stellar Spectrophotometry, Variable Stars, Fabry-Perot Spectrometers, Mira Variables, Momentum Transfer, Radial Velocity, Radiation Pressure, Spectral Energy Distribution, Stellar Envelopes

Scientific paper

The authors have obtained Hα emission line profiles from R Aquarii, a Mira variable surrounded by a complex nebulosity, using a very high-resolution Fabry-Pérot spectrometer. A new feature that was seen in the observations is the fact that the line profile shows a splitting which is interpreted as due to two expanding shells surrounding the star with velocities of ≡5 km s-1 and ≡15 km s-1. The expansion velocities show an acceleration outwards due perhaps to the radiation pressure caused momentum transfer. Possible periodic variation of radial velocity derived from observations is discussed.

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