High-resolution interstellar and stellar line profiles of stars in the globular cluster M22

Details High-resolution interstellar and stellar line profiles of stars in the globular cluster M22 High-resolution interstellar and stellar line profiles of stars in the globular cluster M22

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.245..238b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 245, July 15, 1990, p. 238-243. Research supported by S

Astronomy and Astrophysics

Astronomy

20

Globular Clusters, H Alpha Line, Line Shape, Line Spectra, Stellar Envelopes, Stellar Spectra, H I Regions, Line Of Sight, Sagittarius Constellation

Scientific paper

High-resolution (about 5 km/sec FWHM) spectra have been obtained for stars in the globular cluster M22 using the University College London echelle spectrograph (UCLES) at the coude focus of the AAT. The prime objective was a study of the fine-scale spatial structure of the line-of-sight gas through observations of the Na D lines. Essentially, the gas toward the cluster at distance about 6 kpc is concentrated in two components at the approximate velocites (LSR) of + 6 and + 37 km/sec. The lower-velocity material is likely to be part of a nearby H I cloud, first mapped in the radio region. The higher-velocity gas varies from a single component to a multiple component structure over the angular extent of the cluster. The distance to this material is less certain, but it may be associated with the Sagittarius arm. New observations are presented also for the stellar H-alpha and Na D lines. Time variability of H-alpha emission and Na D line asymmetry are detected for two stars. The present data are in qualitative agreement with models for mass loss occurring in expanding circumstellar envelopes.

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