Gravothermal oscillations in multicomponent models of star clusters
Abstract In this paper, gravothermal oscillations are investigated in multicomponent star clusters which have power-law initial mass functions (IMFs). For the power-law IMFs, the minimum masses (m min) were fixed and three different maximum stellar masses (m max) were used along with different power...
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Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2012-10, Vol.425 (4), p.2493-2500 |
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description | Abstract
In this paper, gravothermal oscillations are investigated in multicomponent star clusters which have power-law initial mass functions (IMFs). For the power-law IMFs, the minimum masses (m
min) were fixed and three different maximum stellar masses (m
max) were used along with different power-law exponents (α) ranging from 0 to −2.35 (Salpeter). The critical number of stars at which gravothermal oscillations first appear with increasing N was found using the multicomponent gas code spedi. The total mass (M
tot) is seen to give an approximate stability condition for power-law IMFs with fixed values of m
max and m
min independent of α. The value M
tot/m
max ≃ 12 000 is shown to give an approximate stability condition which is also independent of m
max, though the critical value is somewhat higher for the steepest IMF that was studied. For appropriately chosen cases, direct N-body runs were carried out in order to check the results obtained from spedi. Finally, evidence of the gravothermal nature of the oscillations found in the N-body runs is presented. |
doi_str_mv | 10.1111/j.1365-2966.2012.21688.x |
format | Article |
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In this paper, gravothermal oscillations are investigated in multicomponent star clusters which have power-law initial mass functions (IMFs). For the power-law IMFs, the minimum masses (m
min) were fixed and three different maximum stellar masses (m
max) were used along with different power-law exponents (α) ranging from 0 to −2.35 (Salpeter). The critical number of stars at which gravothermal oscillations first appear with increasing N was found using the multicomponent gas code spedi. The total mass (M
tot) is seen to give an approximate stability condition for power-law IMFs with fixed values of m
max and m
min independent of α. The value M
tot/m
max ≃ 12 000 is shown to give an approximate stability condition which is also independent of m
max, though the critical value is somewhat higher for the steepest IMF that was studied. For appropriately chosen cases, direct N-body runs were carried out in order to check the results obtained from spedi. Finally, evidence of the gravothermal nature of the oscillations found in the N-body runs is presented.</description><identifier>ISSN: 0035-8711</identifier><identifier>EISSN: 1365-2966</identifier><identifier>DOI: 10.1111/j.1365-2966.2012.21688.x</identifier><language>eng</language><publisher>Oxford, UK: Blackwell Science Ltd</publisher><subject>Astrophysics ; globular clusters: general ; Mathematical models ; methods: numerical ; Stars & galaxies ; Thermography</subject><ispartof>Monthly notices of the Royal Astronomical Society, 2012-10, Vol.425 (4), p.2493-2500</ispartof><rights>2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS 2012</rights><rights>2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS</rights><rights>Monthly Notices of the Royal Astronomical Society © 2012 RAS</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c4208-2189fbe9186a935daead3f695736e85297edc5a17e3eeed617c7bf098a801223</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1111%2Fj.1365-2966.2012.21688.x$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1111%2Fj.1365-2966.2012.21688.x$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,27924,27925,45574,45575</link.rule.ids></links><search><creatorcontrib>Breen, Philip G.</creatorcontrib><creatorcontrib>Heggie, Douglas C.</creatorcontrib><title>Gravothermal oscillations in multicomponent models of star clusters</title><title>Monthly notices of the Royal Astronomical Society</title><addtitle>Mon. Not. R. Astron. Soc</addtitle><description>Abstract
In this paper, gravothermal oscillations are investigated in multicomponent star clusters which have power-law initial mass functions (IMFs). For the power-law IMFs, the minimum masses (m
min) were fixed and three different maximum stellar masses (m
max) were used along with different power-law exponents (α) ranging from 0 to −2.35 (Salpeter). The critical number of stars at which gravothermal oscillations first appear with increasing N was found using the multicomponent gas code spedi. The total mass (M
tot) is seen to give an approximate stability condition for power-law IMFs with fixed values of m
max and m
min independent of α. The value M
tot/m
max ≃ 12 000 is shown to give an approximate stability condition which is also independent of m
max, though the critical value is somewhat higher for the steepest IMF that was studied. For appropriately chosen cases, direct N-body runs were carried out in order to check the results obtained from spedi. Finally, evidence of the gravothermal nature of the oscillations found in the N-body runs is presented.</description><subject>Astrophysics</subject><subject>globular clusters: general</subject><subject>Mathematical models</subject><subject>methods: numerical</subject><subject>Stars & galaxies</subject><subject>Thermography</subject><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNp1kF1LwzAUhoMoOKf_IeCNN635WNPkRpChU5gKsvuQtafYkjYzaXX796abeKGYmxM4z3k550EIU5LS-K6blHKRJUwJkTJCWcqokDLdHqHJT-MYTQjhWSJzSk_RWQgNIWTGmZig-cKbD9e_gW-NxS4UtbWmr10XcN3hdrB9Xbh24zroety6EmzArsKhNx4Xdgg9-HCOTipjA1x81yla3d-t5g_J8mXxOL9dJsWMEZkwKlW1BkWlMIpnpQFT8kqoLOcCZMZUDmWRGZoDB4BS0LzI1xVR0sh4F-NTdHWI3Xj3PkDodVuHAuK-HbghaEqEigYyOqKXv9DGDb6Ly0WKC5nNCBmpmwP1WVvY6Y2vW-N3kdCjWd3oUaAeBerRrN6b1Vv99Py6_8YAfghww-af8eTPOP8C9bF96Q</recordid><startdate>20121001</startdate><enddate>20121001</enddate><creator>Breen, Philip G.</creator><creator>Heggie, Douglas C.</creator><general>Blackwell Science Ltd</general><general>Oxford University Press</general><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>7TG</scope><scope>KL.</scope></search><sort><creationdate>20121001</creationdate><title>Gravothermal oscillations in multicomponent models of star clusters</title><author>Breen, Philip G. ; Heggie, Douglas C.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4208-2189fbe9186a935daead3f695736e85297edc5a17e3eeed617c7bf098a801223</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Astrophysics</topic><topic>globular clusters: general</topic><topic>Mathematical models</topic><topic>methods: numerical</topic><topic>Stars & galaxies</topic><topic>Thermography</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Breen, Philip G.</creatorcontrib><creatorcontrib>Heggie, Douglas C.</creatorcontrib><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><jtitle>Monthly notices of the Royal Astronomical Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Breen, Philip G.</au><au>Heggie, Douglas C.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Gravothermal oscillations in multicomponent models of star clusters</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><stitle>Mon. Not. R. Astron. Soc</stitle><date>2012-10-01</date><risdate>2012</risdate><volume>425</volume><issue>4</issue><spage>2493</spage><epage>2500</epage><pages>2493-2500</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><abstract>Abstract
In this paper, gravothermal oscillations are investigated in multicomponent star clusters which have power-law initial mass functions (IMFs). For the power-law IMFs, the minimum masses (m
min) were fixed and three different maximum stellar masses (m
max) were used along with different power-law exponents (α) ranging from 0 to −2.35 (Salpeter). The critical number of stars at which gravothermal oscillations first appear with increasing N was found using the multicomponent gas code spedi. The total mass (M
tot) is seen to give an approximate stability condition for power-law IMFs with fixed values of m
max and m
min independent of α. The value M
tot/m
max ≃ 12 000 is shown to give an approximate stability condition which is also independent of m
max, though the critical value is somewhat higher for the steepest IMF that was studied. For appropriately chosen cases, direct N-body runs were carried out in order to check the results obtained from spedi. Finally, evidence of the gravothermal nature of the oscillations found in the N-body runs is presented.</abstract><cop>Oxford, UK</cop><pub>Blackwell Science Ltd</pub><doi>10.1111/j.1365-2966.2012.21688.x</doi><tpages>8</tpages><oa>free_for_read</oa></addata></record> |
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subjects | Astrophysics globular clusters: general Mathematical models methods: numerical Stars & galaxies Thermography |
title | Gravothermal oscillations in multicomponent models of star clusters |
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