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

Journal Article:

Abstract

M12 is the prototypical collapsed-core globular cluster. Having undergone collapse, its core is believed now to be expanding, with energy for the re-expansion provided by binary stars, which turn gravitational potential energy into kinetic energy. Because these binary stars are generally more massive than single stars, they will have settled to the centre of the cluster. We report here that several of the stars at the core of M15 show Ca II H- and K-line emission characteristic of young, rapidly rotating stars and close binaries. We argue that the emission from M15 comes from primordial binaries, in which a period of spin-up 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 the cluster dynamics. (author).
Authors:
Murphy, B W; [1]  Rutten, R G.M.; [2]  Callanan, P J; [3]  Seitzer, Patrick; [4]  Charles, P A; [5]  Cohn, H N; Lugger, P M [6] 
  1. Rijksuniversiteit Utrecht (Netherlands). Inst. of Astronomy
  2. Astronomical Inst. 'Anton Pannekoek', Amsterdam (Netherlands)
  3. Oxford Univ. (UK). Dept. of Astrophysics
  4. Space Telescope Science Inst., Baltimore, MD (USA)
  5. Oxford Univ. (UK). Dept. of Astrophysics Observatorio del Roque do los Muchachos, Santa Cruz de La Palma, Tenerife, Canary Islands (Spain)
  6. Indiana Univ., Bloomington, IN (USA). Dept. of Astronomy
Publication Date:
May 09, 1991
Product Type:
Journal Article
Reference Number:
AIX-22-074640; EDB-91-136327
Resource Relation:
Journal Name: Nature (London); (United Kingdom); Journal Volume: 351:6322
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; STAR CLUSTERS; BINARY STARS; EMISSION SPECTRA; CALCIUM; EXPANSION; GRAVITATION; GRAVITATIONAL COLLAPSE; KINETIC ENERGY; MAGNETIC FIELDS; MASS; POTENTIAL ENERGY; STAR EVOLUTION; STELLAR CHROMOSPHERES; ALKALINE EARTH METALS; ATMOSPHERES; ELEMENTS; ENERGY; METALS; SPECTRA; STARS; STELLAR ATMOSPHERES; 640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources
OSTI ID:
5378278
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0028-0836; CODEN: NATUA
Submitting Site:
GBN
Size:
Pages: 130-132
Announcement Date:

Journal Article:

Citation Formats

Murphy, B W, Rutten, R G.M., Callanan, P J, Seitzer, Patrick, Charles, P A, Cohn, H N, and Lugger, P M. Detection of binaries in the core of the globular cluster M15 using calcium emission lines. United Kingdom: N. p., 1991. Web. doi:10.1038/351130a0.
Murphy, B W, Rutten, R G.M., Callanan, P J, Seitzer, Patrick, Charles, P A, Cohn, H N, & Lugger, P M. Detection of binaries in the core of the globular cluster M15 using calcium emission lines. United Kingdom. doi:10.1038/351130a0.
Murphy, B W, Rutten, R G.M., Callanan, P J, Seitzer, Patrick, Charles, P A, Cohn, H N, and Lugger, P M. 1991. "Detection of binaries in the core of the globular cluster M15 using calcium emission lines." United Kingdom. doi:10.1038/351130a0. https://www.osti.gov/servlets/purl/10.1038/351130a0.
@misc{etde_5378278,
title = {Detection of binaries in the core of the globular cluster M15 using calcium emission lines}
author = {Murphy, B W, Rutten, R G.M., Callanan, P J, Seitzer, Patrick, Charles, P A, Cohn, H N, and Lugger, P M}
abstractNote = {M12 is the prototypical collapsed-core globular cluster. Having undergone collapse, its core is believed now to be expanding, with energy for the re-expansion provided by binary stars, which turn gravitational potential energy into kinetic energy. Because these binary stars are generally more massive than single stars, they will have settled to the centre of the cluster. We report here that several of the stars at the core of M15 show Ca II H- and K-line emission characteristic of young, rapidly rotating stars and close binaries. We argue that the emission from M15 comes from primordial binaries, in which a period of spin-up 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 the cluster dynamics. (author).}
doi = {10.1038/351130a0}
journal = {Nature (London); (United Kingdom)}
volume = {351:6322}
journal type = {AC}
place = {United Kingdom}
year = {1991}
month = {May}
}