HST Spectroscopic Observations of Two Red Giants in NGC 6752

Details HST Spectroscopic Observations of Two Red Giants in NGC 6752 HST Spectroscopic Observations of Two Red Giants in NGC 6752

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.7504d&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #75.04; Bulletin of the American Astronomical Society, Vol. 24, p.1242

Astronomy and Astrophysics

Astronomy

Scientific paper

Ultraviolet observations of two red giants A31 and A59 in the globular cluster NGC 6752 were made with the GHRS on HST in April 1992. The medium resolution G270M grating was centered on the Mg II doublet (lambda 2795, lambda 2802) with total integration times of ~ 4 hrs for each star. The Mg II profiles show emission in both members of the multiplet with substantial absorption on the short-wavelength wings extending to ~ 100 km\ s(-1) . These profiles indicate an expanding atmosphere and the presence of a stellar wind. Near simultaneous spectroscopy of the Hα and Ca II K-line were obtained at the 74-inch telescope and coude spectrograph at Mt. Stromlo. The Hα profiles in both stars indicate outward expansion as inferred from emission asymmetries and shifts of the absorption core. The Mg II observations are the first detection of winds from globular cluster giants. Theory demands mass loss from red giant stars in globular clusters, yet it has not been detected spectroscopically until now. Moreover, the fast outward velocity of this material exceeds the central escape velocity from NGC 6752, providing a natural explanation for the observed lack of interstellar material within globular clusters.

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