Spectroscopy of chromospheric lines of giants in the globular cluster

Details Spectroscopy of chromospheric lines of giants in the globular cluster Spectroscopy of chromospheric lines of giants in the globular cluster

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...421..542d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 421, no. 2, p. 542-549

Astronomy and Astrophysics

Astronomy

23

Chromosphere, Giant Stars, Globular Clusters, Line Spectra, Stellar Mass, Stellar Spectra, Ultraviolet Astronomy, Ultraviolet Spectra, Astronomical Spectroscopy, Atomic Spectra, Calcium, Emission Spectra, H Alpha Line, Magnesium, Shock Waves, Spectrographs

Scientific paper

Spectroscopic observations of chromospheric transitions (Mg II, H-alpha, and Ca II K) from two red giants (A31 and A59) in the globular cluster NGC 6572 were made with the Goddard High Resolution Spectrograph on the Hubble Space Telescope and the coude spectrograph of the 1.9 m telescope at the Mount Stromlo Observatory. These measurements give evidence for chromospheric activity and outward motions within the atmospheres. The surface flux of the Mg II emission is comparable to that in disk population giants of similar (B-V) color. The Mg II profiles are asymmetric, which is most likely caused by absorption in an expanding stellar atmosphere and/or by possible interstellar features. Notches are found in the core of the H-alpha line of A59, which are similar to those found in Cepheids. This suggests that shocks are present in the atmosphere of A59 and indicates that hydrodynamic phenomena are influencing the level of chromospheric emission and producing upper atmospheric motions which may lead to mass loss.

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