A Search for Mass Loss from Two Red Giants in NGC 6752

Details A Search for Mass Loss from Two Red Giants in NGC 6752 A Search for Mass Loss from Two Red Giants in NGC 6752

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2693d&link_type=abstract

HST Proposal ID #2693

Physics

Hst Proposal Id #2693

Scientific paper

To reproduce the observed color magnitude diagram of globular clusters with stellar evolution codes, it has been necessary to assume that substantial amounts of mass are lost from metal-poor stars ascending the red giant branch for the first time. Currently however, there is no direct observational detection of mass loss from such stars. We propose to obtain high resolution spectra of the 2795.5 and 2802.7 Mg II (h and k ) lines for two red giants in the globular cluster NGC 6752. The profiles of these well known chromospheric lines can establish the presence of stellar mass loss from and circumstellar material around red giant stars in globular clusters. The High Resolution Spectrograph is the only instrument available that is capable of high resolution ultraviolet spectroscopy of stars as faint as globular cluster red giants. The rate of any mass loss, as well as the outflow velocity, can be derived from fitting the observed Mg II profiles will represent fundamental data necessary for understanding late stages of the evolution of low-mass stars.

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