The nature of donors in ultraluminous X-ray binaries powered by neutron stars
Abstract This study examines the properties of the donor stars of three recently discovered ultraluminous X-ray sources (ULXs) powered by rotating neutron stars. In order to do this, a theoretical relationship was constructed between the X-ray luminosity (LX) and the orbital period (Porb) suitable f...
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| Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2018-03, Vol.474 (4), p.4564-4570 |
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| container_title | Monthly notices of the Royal Astronomical Society |
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| creator | Karino, Shigeyuki |
| description | Abstract
This study examines the properties of the donor stars of three recently discovered ultraluminous X-ray sources (ULXs) powered by rotating neutron stars. In order to do this, a theoretical relationship was constructed between the X-ray luminosity (LX) and the orbital period (Porb) suitable for ULXs with neutron stars. Using this new LX–Porb relationship, we attempted to determine the currently unknown nature of donor stars in ULXs associated with neutron stars. In particular, from a comparison between the observed properties and the stellar evolution tracks, we suggest that the donor star in the NGC5907 ULX-1 system is a moderately massive star of 6–12 M⊙, just departing from the main sequence phase. The results of our models for the other two ULX systems (M82 X-2 and NGC7793 P-13) are consistent with those in previous studies. Although there are only a few samples, observed ULX systems with neutron stars seem to involve relatively massive donors. |
| doi_str_mv | 10.1093/mnras/stx2998 |
| format | Article |
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This study examines the properties of the donor stars of three recently discovered ultraluminous X-ray sources (ULXs) powered by rotating neutron stars. In order to do this, a theoretical relationship was constructed between the X-ray luminosity (LX) and the orbital period (Porb) suitable for ULXs with neutron stars. Using this new LX–Porb relationship, we attempted to determine the currently unknown nature of donor stars in ULXs associated with neutron stars. In particular, from a comparison between the observed properties and the stellar evolution tracks, we suggest that the donor star in the NGC5907 ULX-1 system is a moderately massive star of 6–12 M⊙, just departing from the main sequence phase. The results of our models for the other two ULX systems (M82 X-2 and NGC7793 P-13) are consistent with those in previous studies. Although there are only a few samples, observed ULX systems with neutron stars seem to involve relatively massive donors.</description><identifier>ISSN: 0035-8711</identifier><identifier>EISSN: 1365-2966</identifier><identifier>DOI: 10.1093/mnras/stx2998</identifier><language>eng</language><publisher>London: Oxford University Press</publisher><subject>Binary stars ; Luminosity ; Neutron stars ; Neutrons ; Orbits ; Quarks ; Stellar evolution ; Stellar rotation ; X ray binaries ; X ray sources ; X ray stars</subject><ispartof>Monthly notices of the Royal Astronomical Society, 2018-03, Vol.474 (4), p.4564-4570</ispartof><rights>2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society 2018</rights><rights>2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c298t-55b29adf976b68001f52adf4f1b8c38adb3e1cffd0978ffbd4359fde1f4332b63</citedby><cites>FETCH-LOGICAL-c298t-55b29adf976b68001f52adf4f1b8c38adb3e1cffd0978ffbd4359fde1f4332b63</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,1604,27924,27925</link.rule.ids><linktorsrc>$$Uhttps://dx.doi.org/10.1093/mnras/stx2998$$EView_record_in_Oxford_University_Press$$FView_record_in_$$GOxford_University_Press</linktorsrc></links><search><creatorcontrib>Karino, Shigeyuki</creatorcontrib><title>The nature of donors in ultraluminous X-ray binaries powered by neutron stars</title><title>Monthly notices of the Royal Astronomical Society</title><description>Abstract
This study examines the properties of the donor stars of three recently discovered ultraluminous X-ray sources (ULXs) powered by rotating neutron stars. In order to do this, a theoretical relationship was constructed between the X-ray luminosity (LX) and the orbital period (Porb) suitable for ULXs with neutron stars. Using this new LX–Porb relationship, we attempted to determine the currently unknown nature of donor stars in ULXs associated with neutron stars. In particular, from a comparison between the observed properties and the stellar evolution tracks, we suggest that the donor star in the NGC5907 ULX-1 system is a moderately massive star of 6–12 M⊙, just departing from the main sequence phase. The results of our models for the other two ULX systems (M82 X-2 and NGC7793 P-13) are consistent with those in previous studies. Although there are only a few samples, observed ULX systems with neutron stars seem to involve relatively massive donors.</description><subject>Binary stars</subject><subject>Luminosity</subject><subject>Neutron stars</subject><subject>Neutrons</subject><subject>Orbits</subject><subject>Quarks</subject><subject>Stellar evolution</subject><subject>Stellar rotation</subject><subject>X ray binaries</subject><subject>X ray sources</subject><subject>X ray stars</subject><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNqF0E1LAzEQgOEgCtbq0XvAi5fYfOxmk6MUv6DipYK3JdlNcEubrJME7b93td49DQMPM_AidMnoDaNaLHYBTFqk_MW1VkdoxoSsCddSHqMZpaImqmHsFJ2ltKGUVoLLGXpevzscTC7gcPS4jyFCwkPAZZvBbMtuCLEk_EbA7LEdgoHBJTzGTweux3aPgysZYsApG0jn6MSbbXIXf3OOXu_v1stHsnp5eFrerkjHtcqkri3Xpve6kVYqSpmv-bRWnlnVCWV6KxzrvO-pbpT3tq9ErX3vmK-E4FaKObo63B0hfhSXcruJBcL0suWMU8kEb_ikyEF1EFMC59sRhp2Bfcto-1Os_S3W_hWb_PXBxzL-Q78Bu6Jv7w</recordid><startdate>20180301</startdate><enddate>20180301</enddate><creator>Karino, Shigeyuki</creator><general>Oxford University Press</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20180301</creationdate><title>The nature of donors in ultraluminous X-ray binaries powered by neutron stars</title><author>Karino, Shigeyuki</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c298t-55b29adf976b68001f52adf4f1b8c38adb3e1cffd0978ffbd4359fde1f4332b63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Binary stars</topic><topic>Luminosity</topic><topic>Neutron stars</topic><topic>Neutrons</topic><topic>Orbits</topic><topic>Quarks</topic><topic>Stellar evolution</topic><topic>Stellar rotation</topic><topic>X ray binaries</topic><topic>X ray sources</topic><topic>X ray stars</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Karino, Shigeyuki</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Monthly notices of the Royal Astronomical Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Karino, Shigeyuki</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The nature of donors in ultraluminous X-ray binaries powered by neutron stars</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><date>2018-03-01</date><risdate>2018</risdate><volume>474</volume><issue>4</issue><spage>4564</spage><epage>4570</epage><pages>4564-4570</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><abstract>Abstract
This study examines the properties of the donor stars of three recently discovered ultraluminous X-ray sources (ULXs) powered by rotating neutron stars. In order to do this, a theoretical relationship was constructed between the X-ray luminosity (LX) and the orbital period (Porb) suitable for ULXs with neutron stars. Using this new LX–Porb relationship, we attempted to determine the currently unknown nature of donor stars in ULXs associated with neutron stars. In particular, from a comparison between the observed properties and the stellar evolution tracks, we suggest that the donor star in the NGC5907 ULX-1 system is a moderately massive star of 6–12 M⊙, just departing from the main sequence phase. The results of our models for the other two ULX systems (M82 X-2 and NGC7793 P-13) are consistent with those in previous studies. Although there are only a few samples, observed ULX systems with neutron stars seem to involve relatively massive donors.</abstract><cop>London</cop><pub>Oxford University Press</pub><doi>10.1093/mnras/stx2998</doi><tpages>7</tpages></addata></record> |
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| ispartof | Monthly notices of the Royal Astronomical Society, 2018-03, Vol.474 (4), p.4564-4570 |
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| language | eng |
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| source | Oxford Journals Open Access Collection |
| subjects | Binary stars Luminosity Neutron stars Neutrons Orbits Quarks Stellar evolution Stellar rotation X ray binaries X ray sources X ray stars |
| title | The nature of donors in ultraluminous X-ray binaries powered by neutron stars |
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