Detection of binaries in the core of the globular cluster M15 using calcium emission lines

Details Detection of binaries in the core of the globular cluster M15 using calcium emission lines Detection of binaries in the core of the globular cluster M15 using calcium emission lines

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.351..130m&link_type=abstract

Nature (ISSN 0028-0836), vol. 351, May 9, 1991, p. 130-132. ASTRON-supported research.

Astronomy and Astrophysics

Astronomy

15

Binary Stars, Calcium, Emission Spectra, Globular Clusters, Stellar Atmospheres, Stellar Interiors, Stellar Magnetic Fields

Scientific paper

It is reported that several of the stars at the core of the prototypical collapsed core globular cluster M15 show Ca II H- an K-line emission characteristic of young, rapidly rotating stars and close binaries. It is argued that the emission from M15 comes from primordial binaries in which a period of spinup has led to magnetic field generation by enhanced dynamo action, which in turn causes heating of the stellar chromospheres. If this interpretation is correct, the Ca H and K emission may provide an important diagnostic tool of the binary population in cluster cores, and thus of cluster dynamics.

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