Monte Carlo simulations of star clusters – VI. The globular cluster NGC 6397
We describe Monte Carlo models for the dynamical evolution of the nearby globular cluster NGC 6397. The code includes treatments of two-body relaxation, most kinds of three- and four-body interactions involving primordial binaries and those formed dynamically, the Galactic tide and the internal evol...
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| Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2009-05, Vol.395 (2), p.1173-1183 |
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| creator | Giersz, Mirek Heggie, Douglas C. |
| description | We describe Monte Carlo models for the dynamical evolution of the nearby globular cluster NGC 6397. The code includes treatments of two-body relaxation, most kinds of three- and four-body interactions involving primordial binaries and those formed dynamically, the Galactic tide and the internal evolution of both single and binary stars. We arrive at a set of initial parameters for the cluster which, after 12 Gyr of evolution, gives a model with a fairly satisfactory match to the surface brightness profile, the velocity dispersion profile and the luminosity function in two fields. We describe in particular those aspects of the evolution which distinguish this cluster from M4, which has a roughly similar mass and Galactocentric distance, but a qualitatively different surface brightness profile. Within the limitations of our modelling, we conclude that the most plausible explanation for the difference is fluctuations: both clusters are post-collapse objects, but sometimes have resolvable cores and sometimes not. |
| doi_str_mv | 10.1111/j.1365-2966.2009.14638.x |
| format | Article |
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We describe in particular those aspects of the evolution which distinguish this cluster from M4, which has a roughly similar mass and Galactocentric distance, but a qualitatively different surface brightness profile. 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Within the limitations of our modelling, we conclude that the most plausible explanation for the difference is fluctuations: both clusters are post-collapse objects, but sometimes have resolvable cores and sometimes not.</description><subject>Astronomy</subject><subject>Astrophysics</subject><subject>Double stars</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>globular clusters: individual: M4</subject><subject>globular clusters: individual: NGC 6397</subject><subject>methods: numerical</subject><subject>Monte Carlo simulation</subject><subject>stellar dynamics</subject><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><recordid>eNqNkd2K1DAYhoMoOK7eQxD0rDV_TZoTQYv7x-4Isg6LJyFNE-2YacakZWfPvAfv0CvZzHaZA1EwJwl8z_vy8QQAiFGJ83mzLjHlVUEk5yVBSJaYcVqXu0dgcRg8BguEaFXUAuOn4FlKa4QQo4QvwPIyDKOFjY4-wNRvJq_HPgwJBgfTqCM0fkqjjQn-_vkLrs5KePXNwq8-tJk8TOHypIGcSvEcPHHaJ_vi4T4Cn48_XDWnxcXHk7Pm3UVhOEJ1YQxrK4ulYC0W2jniBOpcK7rKurZjqKPcCmqlpNrWpia1RFbjDmvUidpQR4_A67l3G8OPyaZRbfpkrPd6sGFKiqCKEcRFBl_-Aa7DFIe8W2YEZYIxmqF6hkwMKUXr1Db2Gx1vFUZqb1mt1V6m2stUe8vq3rLa5eirh36djPYu6sH06ZAnmCEpa5a5tzN303t7-9_96nL56f6ZC-hcEKbtP-LF39Yr5lSfv2l3yOn4XWU5olKn11_U6ry6bsjqveL0DrOGrbc</recordid><startdate>20090511</startdate><enddate>20090511</enddate><creator>Giersz, Mirek</creator><creator>Heggie, Douglas C.</creator><general>Blackwell Publishing Ltd</general><general>Wiley-Blackwell</general><general>Oxford University Press</general><scope>BSCLL</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>7TG</scope><scope>KL.</scope></search><sort><creationdate>20090511</creationdate><title>Monte Carlo simulations of star clusters – VI. 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The globular cluster NGC 6397</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><stitle>Monthly Notices of the Royal Astronomical Society</stitle><addtitle>Monthly Notices of the Royal Astronomical Society</addtitle><date>2009-05-11</date><risdate>2009</risdate><volume>395</volume><issue>2</issue><spage>1173</spage><epage>1183</epage><pages>1173-1183</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><coden>MNRAA4</coden><abstract>We describe Monte Carlo models for the dynamical evolution of the nearby globular cluster NGC 6397. The code includes treatments of two-body relaxation, most kinds of three- and four-body interactions involving primordial binaries and those formed dynamically, the Galactic tide and the internal evolution of both single and binary stars. 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| subjects | Astronomy Astrophysics Double stars Earth, ocean, space Exact sciences and technology globular clusters: individual: M4 globular clusters: individual: NGC 6397 methods: numerical Monte Carlo simulation stellar dynamics |
| title | Monte Carlo simulations of star clusters – VI. The globular cluster NGC 6397 |
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