A Dynamical Evolution Study of 40 2MASS Open Clusters
We investigate the dynamical evolution of 40 open clusters (OCs) by means of their astrophysical parameters derived from field-decontaminated 2MASS photometry. We find a bifurcation in the planes core radius vs. age and cluster radius vs. age, in which part of the clusters appear to expand with time...
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| creator | Güneş, Orhan Yüksel Karataş Bonatto, Charles |
| description | We investigate the dynamical evolution of 40 open clusters (OCs) by means of their astrophysical parameters derived from field-decontaminated 2MASS photometry. We find a bifurcation in the planes core radius vs. age and cluster radius vs. age, in which part of the clusters appear to expand with time probably due to the presence of stellar black holes while others seem to shrink due to dynamical relaxation. Mass functions (MFs) are built for 3\(/\)4 of the sample (31 OCs), which are used to search for indications of mass segregation and external dynamical processes by means of relations among astrophysical, structural and evolutionary parameters. We detect a flattening of MF slopes ocurring at the evolutionary parameters \(\tau_{core}\leq 32\) and \(\tau_{overall}\leq 30\), respectively. Within the uncertainties involved, the overall MF slopes of 14 out of 31 OCs with \(m_{overall} > 500~M_{\odot}\) are consistent with Kroupa's initial mass function, implying little or no dynamical evolution for these clusters. The remaining 17 OCs with MF slopes departing from that of Kroupa show mild/large scale mass segregation due to dynamical evolution. |
| doi_str_mv | 10.48550/arxiv.1511.01034 |
| format | Article |
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We find a bifurcation in the planes core radius vs. age and cluster radius vs. age, in which part of the clusters appear to expand with time probably due to the presence of stellar black holes while others seem to shrink due to dynamical relaxation. Mass functions (MFs) are built for 3\(/\)4 of the sample (31 OCs), which are used to search for indications of mass segregation and external dynamical processes by means of relations among astrophysical, structural and evolutionary parameters. We detect a flattening of MF slopes ocurring at the evolutionary parameters \(\tau_{core}\leq 32\) and \(\tau_{overall}\leq 30\), respectively. Within the uncertainties involved, the overall MF slopes of 14 out of 31 OCs with \(m_{overall} > 500~M_{\odot}\) are consistent with Kroupa's initial mass function, implying little or no dynamical evolution for these clusters. 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The remaining 17 OCs with MF slopes departing from that of Kroupa show mild/large scale mass segregation due to dynamical evolution.</description><subject>Bifurcations</subject><subject>Black holes</subject><subject>Cyclones</subject><subject>Decontamination</subject><subject>Evolution</subject><subject>Initial mass function</subject><subject>Open clusters</subject><subject>Parameters</subject><subject>Photometry</subject><subject>Physics - Astrophysics of Galaxies</subject><subject>Slopes</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GOX</sourceid><recordid>eNotj01Lw0AURQdBsNT-AFcOuE588_FmJstQqxUqXaT7ME1mICVN4iQp5t8bW1eXC4fLPYQ8MYilQYRXG36qS8yQsRgYCHlHFlwIFhnJ-QNZ9f0JALjSHFEsCKb0bWrsuSpsTTeXth6Hqm1oNozlRFtPJVD-lWYZ3Xeuoet67AcX-kdy723du9V_LsnhfXNYb6Pd_uNzne4ii9xEQicMLPpE6dIrn2Ci5NGCL71Hf0SnlbFOeVmIwmkzFwFolYQCZ6xUUizJ82326pR3oTrbMOV_bvnVbSZebkQX2u_R9UN-asfQzJ9yDlpJCYwb8Qttb08w</recordid><startdate>20151103</startdate><enddate>20151103</enddate><creator>Güneş, Orhan</creator><creator>Yüksel Karataş</creator><creator>Bonatto, Charles</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>GOX</scope></search><sort><creationdate>20151103</creationdate><title>A Dynamical Evolution Study of 40 2MASS Open Clusters</title><author>Güneş, Orhan ; Yüksel Karataş ; Bonatto, Charles</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a528-37910a5f967df6f95964ba0fdff5fb5e768ae6f4c3ce7868a305a640c54bad643</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>Bifurcations</topic><topic>Black holes</topic><topic>Cyclones</topic><topic>Decontamination</topic><topic>Evolution</topic><topic>Initial mass function</topic><topic>Open clusters</topic><topic>Parameters</topic><topic>Photometry</topic><topic>Physics - Astrophysics of Galaxies</topic><topic>Slopes</topic><toplevel>online_resources</toplevel><creatorcontrib>Güneş, Orhan</creatorcontrib><creatorcontrib>Yüksel Karataş</creatorcontrib><creatorcontrib>Bonatto, Charles</creatorcontrib><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><collection>arXiv.org</collection><jtitle>arXiv.org</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Güneş, Orhan</au><au>Yüksel Karataş</au><au>Bonatto, Charles</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A Dynamical Evolution Study of 40 2MASS Open Clusters</atitle><jtitle>arXiv.org</jtitle><date>2015-11-03</date><risdate>2015</risdate><eissn>2331-8422</eissn><abstract>We investigate the dynamical evolution of 40 open clusters (OCs) by means of their astrophysical parameters derived from field-decontaminated 2MASS photometry. We find a bifurcation in the planes core radius vs. age and cluster radius vs. age, in which part of the clusters appear to expand with time probably due to the presence of stellar black holes while others seem to shrink due to dynamical relaxation. Mass functions (MFs) are built for 3\(/\)4 of the sample (31 OCs), which are used to search for indications of mass segregation and external dynamical processes by means of relations among astrophysical, structural and evolutionary parameters. We detect a flattening of MF slopes ocurring at the evolutionary parameters \(\tau_{core}\leq 32\) and \(\tau_{overall}\leq 30\), respectively. Within the uncertainties involved, the overall MF slopes of 14 out of 31 OCs with \(m_{overall} > 500~M_{\odot}\) are consistent with Kroupa's initial mass function, implying little or no dynamical evolution for these clusters. The remaining 17 OCs with MF slopes departing from that of Kroupa show mild/large scale mass segregation due to dynamical evolution.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.1511.01034</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Bifurcations Black holes Cyclones Decontamination Evolution Initial mass function Open clusters Parameters Photometry Physics - Astrophysics of Galaxies Slopes |
| title | A Dynamical Evolution Study of 40 2MASS Open Clusters |
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