H-alpha emission in old giants

Details H-alpha emission in old giants H-alpha emission in old giants

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...132...11g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 132, no. 1, March 1984, p. 11-19.

Astronomy and Astrophysics

Astrophysics

29

Giant Stars, Globular Clusters, H Alpha Line, Late Stars, Stellar Spectrophotometry, Hertzsprung-Russell Diagram, Horizontal Branch Stars, Metallicity, Open Clusters, Stellar Luminosity

Scientific paper

New data on H-alpha emission in 24 globular cluster giants are combined with similar published data on H-alpha emission in globular cluster, open cluster and field halo giants, making a total homogeneous sample of 113 old giants. On the basis of this sample, the most relevant conclusions are: (i) at the resolving power of the CTIO and KPNO echelle spectrographs, no star with a luminosity log(L/solar L) less than 2.7 has H-alpha emission; (ii) the fraction of stars brighter than log (L/solar L) = 2.7 exhibiting H-alpha emission at this spectral resolution is 0.61 + or - 0.09; this fraction is only weakly dependent on luminosity; (iii) the clusters with red horizontal branches contain very few stars with H-alpha emission wings; and (iv) for other clusters, H-alpha emission may be marginally favored by a higher metallicity and/or microturbulence.

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