An optical search for ionized hydrogen in globular clusters. II

Details An optical search for ionized hydrogen in globular clusters. II An optical search for ionized hydrogen in globular clusters. II

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217l.143h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 217, Nov. 1, 1977, p. L143-L147. Research supported by the Universit

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31

Globular Clusters, Hydrogen Ions, Interstellar Matter, Stellar Mass Ejection, Astronomical Catalogs, Electrophotometers, H Alpha Line, Radial Velocity, Stellar Evolution, X Ray Sources

Scientific paper

Results of an optical search for ionized hydrogen in 31 globular clusters, including four X-ray clusters, are reported which consist of photoelectric H-alpha line profiles obtained with a single-etalon Fabry-Perot interferometer. A previous error regarding NGC 6441 is corrected, showing that this cluster has a radial velocity of about plus 13 km/s rather than -70 km/s and does not exhibit strong H-alpha emission. No ionized hydrogen is detected in any of the other clusters either. Stringent upper limits of no more than 1 solar mass are placed on the ionized hydrogen in the four X-ray clusters (NGC 1851, 6441, 6624, and 7078), and 47 Tuc is estimated to contain no more than 0.03 solar mass of ionized hydrogen in its core relative to a comparable volume of its halo. It is concluded that the mass of interstellar matter expected to accumulate in globular star clusters as a natural consequence of stellar evolutionary processes is not present in the amounts predicted by the best available theoretical models.

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