Spectrophotometry of blue straggler candidates in NGC 6397

Details Spectrophotometry of blue straggler candidates in NGC 6397 Spectrophotometry of blue straggler candidates in NGC 6397

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109..264r&link_type=abstract

The Astronomical Journal (ISSN 0004-6256), vol. 109, no. 1669, p. 264-268

Astronomy and Astrophysics

Astronomy

4

Blue Stars, Globular Clusters, Mass To Light Ratios, Stellar Mass, Stellar Spectrophotometry, Abundance, Binary Stars, Calcium, K Lines, Radial Velocity

Scientific paper

An attempt to determine spectroscopically the mass/luminosity ratios, and hence masses of candidate blue straggler (BS) stars in the globular cluster NGC 6397 is described. Measures of the radial velocities of stars selected from the photometry of Alcaino et al. (1987) are combined with abundances derived from the Ca II K line to identify 4 probable and 3 possible cluster members from a list of 19 photometric candidates. The mass of these stars is found to range from 0.62 to 1.15 solar mass. The masses are generally higher than the turnoff mass of the cluster, supporting binary hypotheses of the origin of BS stars, and are consistent with the relative central concentration of BS stars in globular clusters.

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