UOCS – XI. Study of blue straggler stars in open cluster NGC 7142 using UVIT/AstroSat
ABSTRACT We present a study of blue straggler stars (BSSs) of open cluster NGC 7142 using AstroSat/UVIT data and other archival data. Using a machine-learning-based algorithm, ML-MOC, on Gaia DR3 data, we find 546 sources as cluster members. Based on the location on the Gaia colour–magnitude diagram...
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| Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2024-01, Vol.527 (3), p.8325-8336 |
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| container_title | Monthly notices of the Royal Astronomical Society |
| container_volume | 527 |
| creator | Panthi, Anju Vaidya, Kaushar Vernekar, Nagaraj Subramaniam, Annapurni Jadhav, Vikrant Agarwal, Manan |
| description | ABSTRACT
We present a study of blue straggler stars (BSSs) of open cluster NGC 7142 using AstroSat/UVIT data and other archival data. Using a machine-learning-based algorithm, ML-MOC, on Gaia DR3 data, we find 546 sources as cluster members. Based on the location on the Gaia colour–magnitude diagram, we identify 10 BSS candidates, also detected in UVIT/F148W filter. We study the variable nature of BSSs by constructing their light curves using the Transiting Exoplanet Survey Satellite data. Two BSSs reported as eclipsing binaries in Gaia DR3 are confirmed to be eclipsing binaries based on our analysis and also show the presence of hot companions as per the multiwavelength spectral energy distributions (SEDs). The physical parameters of the hot companions of these two BSSs derived by fitting binary models to their light curves and those derived from the SEDs are found to be in good agreement. Additionally, five more BSSs in the cluster shows UV excess, four of which are likely to have a hot companion based on SEDs. The hot companions with the estimated temperatures ∼14 000–28 000 K, radii ∼0.01–0.05 R⊙, and luminosities ∼0.03–0.1 L⊙ are inferred to be extremely low-mass (0.6 M⊙) white dwarfs (WDs). For the first time in an open cluster, we find the entire range of masses in WDs found as hot companions of BSSs. These masses imply that the Case-A/Case-B mass transfer and merger are responsible for the formation of at least 60 per cent of the BSSs of this cluster. |
| doi_str_mv | 10.1093/mnras/stad3750 |
| format | Article |
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We present a study of blue straggler stars (BSSs) of open cluster NGC 7142 using AstroSat/UVIT data and other archival data. Using a machine-learning-based algorithm, ML-MOC, on Gaia DR3 data, we find 546 sources as cluster members. Based on the location on the Gaia colour–magnitude diagram, we identify 10 BSS candidates, also detected in UVIT/F148W filter. We study the variable nature of BSSs by constructing their light curves using the Transiting Exoplanet Survey Satellite data. Two BSSs reported as eclipsing binaries in Gaia DR3 are confirmed to be eclipsing binaries based on our analysis and also show the presence of hot companions as per the multiwavelength spectral energy distributions (SEDs). The physical parameters of the hot companions of these two BSSs derived by fitting binary models to their light curves and those derived from the SEDs are found to be in good agreement. Additionally, five more BSSs in the cluster shows UV excess, four of which are likely to have a hot companion based on SEDs. The hot companions with the estimated temperatures ∼14 000–28 000 K, radii ∼0.01–0.05 R⊙, and luminosities ∼0.03–0.1 L⊙ are inferred to be extremely low-mass (<0.2 M⊙), low-mass (0.2–0.4 M⊙), normal-mass (0.4–0.6 M⊙), and high-mass (>0.6 M⊙) white dwarfs (WDs). For the first time in an open cluster, we find the entire range of masses in WDs found as hot companions of BSSs. These masses imply that the Case-A/Case-B mass transfer and merger are responsible for the formation of at least 60 per cent of the BSSs of this cluster.</description><identifier>ISSN: 0035-8711</identifier><identifier>EISSN: 1365-2966</identifier><identifier>DOI: 10.1093/mnras/stad3750</identifier><language>eng</language><publisher>London: Oxford University Press</publisher><subject>Algorithms ; Clusters ; Companion stars ; Curve fitting ; Eclipsing binary stars ; Extrasolar planets ; Light curve ; Machine learning ; Mass transfer ; Parameter identification ; Physical properties ; Planet detection ; Transit ; White dwarf stars</subject><ispartof>Monthly notices of the Royal Astronomical Society, 2024-01, Vol.527 (3), p.8325-8336</ispartof><rights>The Author(s) 2023. Published by Oxford University Press on behalf of Royal Astronomical Society. 2023</rights><rights>The Author(s) 2023. Published by Oxford University Press on behalf of Royal Astronomical Society.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c341t-c9fd39d949b60bdadcb5f07b83bfbef1dad4094b3ecf7b6e11eb03cad4c56a7d3</citedby><cites>FETCH-LOGICAL-c341t-c9fd39d949b60bdadcb5f07b83bfbef1dad4094b3ecf7b6e11eb03cad4c56a7d3</cites><orcidid>0000-0001-6965-8642 ; 0000-0003-2947-5889 ; 0000-0002-8672-3300 ; 0000-0003-4662-5463</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,781,785,865,1605,27926,27927</link.rule.ids></links><search><creatorcontrib>Panthi, Anju</creatorcontrib><creatorcontrib>Vaidya, Kaushar</creatorcontrib><creatorcontrib>Vernekar, Nagaraj</creatorcontrib><creatorcontrib>Subramaniam, Annapurni</creatorcontrib><creatorcontrib>Jadhav, Vikrant</creatorcontrib><creatorcontrib>Agarwal, Manan</creatorcontrib><title>UOCS – XI. Study of blue straggler stars in open cluster NGC 7142 using UVIT/AstroSat</title><title>Monthly notices of the Royal Astronomical Society</title><description>ABSTRACT
We present a study of blue straggler stars (BSSs) of open cluster NGC 7142 using AstroSat/UVIT data and other archival data. Using a machine-learning-based algorithm, ML-MOC, on Gaia DR3 data, we find 546 sources as cluster members. Based on the location on the Gaia colour–magnitude diagram, we identify 10 BSS candidates, also detected in UVIT/F148W filter. We study the variable nature of BSSs by constructing their light curves using the Transiting Exoplanet Survey Satellite data. Two BSSs reported as eclipsing binaries in Gaia DR3 are confirmed to be eclipsing binaries based on our analysis and also show the presence of hot companions as per the multiwavelength spectral energy distributions (SEDs). The physical parameters of the hot companions of these two BSSs derived by fitting binary models to their light curves and those derived from the SEDs are found to be in good agreement. Additionally, five more BSSs in the cluster shows UV excess, four of which are likely to have a hot companion based on SEDs. The hot companions with the estimated temperatures ∼14 000–28 000 K, radii ∼0.01–0.05 R⊙, and luminosities ∼0.03–0.1 L⊙ are inferred to be extremely low-mass (<0.2 M⊙), low-mass (0.2–0.4 M⊙), normal-mass (0.4–0.6 M⊙), and high-mass (>0.6 M⊙) white dwarfs (WDs). For the first time in an open cluster, we find the entire range of masses in WDs found as hot companions of BSSs. 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Study of blue straggler stars in open cluster NGC 7142 using UVIT/AstroSat</title><author>Panthi, Anju ; Vaidya, Kaushar ; Vernekar, Nagaraj ; Subramaniam, Annapurni ; Jadhav, Vikrant ; Agarwal, Manan</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c341t-c9fd39d949b60bdadcb5f07b83bfbef1dad4094b3ecf7b6e11eb03cad4c56a7d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2024</creationdate><topic>Algorithms</topic><topic>Clusters</topic><topic>Companion stars</topic><topic>Curve fitting</topic><topic>Eclipsing binary stars</topic><topic>Extrasolar planets</topic><topic>Light curve</topic><topic>Machine learning</topic><topic>Mass transfer</topic><topic>Parameter identification</topic><topic>Physical properties</topic><topic>Planet detection</topic><topic>Transit</topic><topic>White dwarf stars</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Panthi, Anju</creatorcontrib><creatorcontrib>Vaidya, Kaushar</creatorcontrib><creatorcontrib>Vernekar, Nagaraj</creatorcontrib><creatorcontrib>Subramaniam, Annapurni</creatorcontrib><creatorcontrib>Jadhav, Vikrant</creatorcontrib><creatorcontrib>Agarwal, Manan</creatorcontrib><collection>Oxford Open</collection><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</fulltext></delivery><addata><au>Panthi, Anju</au><au>Vaidya, Kaushar</au><au>Vernekar, Nagaraj</au><au>Subramaniam, Annapurni</au><au>Jadhav, Vikrant</au><au>Agarwal, Manan</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>UOCS – XI. Study of blue straggler stars in open cluster NGC 7142 using UVIT/AstroSat</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><date>2024-01-01</date><risdate>2024</risdate><volume>527</volume><issue>3</issue><spage>8325</spage><epage>8336</epage><pages>8325-8336</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><abstract>ABSTRACT
We present a study of blue straggler stars (BSSs) of open cluster NGC 7142 using AstroSat/UVIT data and other archival data. Using a machine-learning-based algorithm, ML-MOC, on Gaia DR3 data, we find 546 sources as cluster members. Based on the location on the Gaia colour–magnitude diagram, we identify 10 BSS candidates, also detected in UVIT/F148W filter. We study the variable nature of BSSs by constructing their light curves using the Transiting Exoplanet Survey Satellite data. Two BSSs reported as eclipsing binaries in Gaia DR3 are confirmed to be eclipsing binaries based on our analysis and also show the presence of hot companions as per the multiwavelength spectral energy distributions (SEDs). The physical parameters of the hot companions of these two BSSs derived by fitting binary models to their light curves and those derived from the SEDs are found to be in good agreement. Additionally, five more BSSs in the cluster shows UV excess, four of which are likely to have a hot companion based on SEDs. The hot companions with the estimated temperatures ∼14 000–28 000 K, radii ∼0.01–0.05 R⊙, and luminosities ∼0.03–0.1 L⊙ are inferred to be extremely low-mass (<0.2 M⊙), low-mass (0.2–0.4 M⊙), normal-mass (0.4–0.6 M⊙), and high-mass (>0.6 M⊙) white dwarfs (WDs). For the first time in an open cluster, we find the entire range of masses in WDs found as hot companions of BSSs. These masses imply that the Case-A/Case-B mass transfer and merger are responsible for the formation of at least 60 per cent of the BSSs of this cluster.</abstract><cop>London</cop><pub>Oxford University Press</pub><doi>10.1093/mnras/stad3750</doi><tpages>12</tpages><orcidid>https://orcid.org/0000-0001-6965-8642</orcidid><orcidid>https://orcid.org/0000-0003-2947-5889</orcidid><orcidid>https://orcid.org/0000-0002-8672-3300</orcidid><orcidid>https://orcid.org/0000-0003-4662-5463</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Algorithms Clusters Companion stars Curve fitting Eclipsing binary stars Extrasolar planets Light curve Machine learning Mass transfer Parameter identification Physical properties Planet detection Transit White dwarf stars |
| title | UOCS – XI. Study of blue straggler stars in open cluster NGC 7142 using UVIT/AstroSat |
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