The RR Lyrae delay-time distribution: a novel perspective on models of old stellar populations

Sarbadhicary, Sumit K. - Heiger, Mairead - Badenes, Carles - Mateu, Cecilia - Newman, Jeffrey A. - Ciardullo, Robin - Hallakoun, Na’ama - Maoz, Dan - Chomiuk, Laura

Resumen:

The delay-time distribution (DTD) is the occurrence rate of a class of objects as a function of time after a hypothetical burst of star formation. DTDs are mainly used as a statistical test of stellar evolution scenarios for supernova progenitors, but they can be applied to many other classes of astronomical objects. We calculate the first DTD for RR Lyrae variables using 29,810 RR Lyrae from the OGLE-IV survey and a map of the stellar age distribution (SAD) in the Large Magellanic Cloud (LMC). We find that ∼46% of the OGLE-IV RR Lyrae are associated with delay times greater than 8 Gyr (main-sequence progenitor masses less than 1 M⊙), and consistent with existing constraints on their ages, but surprisingly about 51% of RR Lyrae appear to have delay times of 1.2–8 Gyr (main-sequence masses between 1 and 2 M⊙ at LMC metallicity). This intermediate-age signal also persists outside the Bar region, where crowding is less of a concern, and we verified that without this signal the spatial distribution of the OGLE-IV RR Lyrae is inconsistent with the SAD map of the LMC. Since an intermediate-age RR Lyrae channel is in tension with the lack of RR Lyrae in intermediate-age clusters (noting issues with small-number statistics), and noting the age–metallicity constraints on LMC stars, our DTD result possibly indicates that systematic uncertainties may still exist in SAD measurements of old stellar populations, perhaps stemming from the construction methodology or the stellar evolution models used. We describe tests to further investigate this issue.


Detalles Bibliográficos
2021
RR LYRAE VARIABLE STARS
LARGE MAGELLANIC CLOUD
STELLAR POPULATIONS
STELLAR EVOLUTION
STELLAR EVOLUTIONARY MODELS
HORIZONTAL BRANCH
STELLAR AGES
STELLAR PULSATIONS
HERTZSPRUNG RUSSELL DIAGRAM
Inglés
Universidad de la República
COLIBRI
https://hdl.handle.net/20.500.12008/42197
Acceso abierto
Licencia Creative Commons Atribución (CC - By 4.0)
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author Sarbadhicary, Sumit K.
author2 Heiger, Mairead
Badenes, Carles
Mateu, Cecilia
Newman, Jeffrey A.
Ciardullo, Robin
Hallakoun, Na’ama
Maoz, Dan
Chomiuk, Laura
author2_role author
author
author
author
author
author
author
author
author_facet Sarbadhicary, Sumit K.
Heiger, Mairead
Badenes, Carles
Mateu, Cecilia
Newman, Jeffrey A.
Ciardullo, Robin
Hallakoun, Na’ama
Maoz, Dan
Chomiuk, Laura
author_role author
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collection COLIBRI
dc.contributor.filiacion.none.fl_str_mv Sarbadhicary Sumit K.
Heiger Mairead
Badenes Carles
Mateu Cecilia, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Física.
Newman Jeffrey A.
Ciardullo Robin
Hallakoun Na’ama
Maoz Dan
Chomiuk Laura
dc.creator.none.fl_str_mv Sarbadhicary, Sumit K.
Heiger, Mairead
Badenes, Carles
Mateu, Cecilia
Newman, Jeffrey A.
Ciardullo, Robin
Hallakoun, Na’ama
Maoz, Dan
Chomiuk, Laura
dc.date.accessioned.none.fl_str_mv 2024-01-12T15:31:52Z
dc.date.available.none.fl_str_mv 2024-01-12T15:31:52Z
dc.date.issued.none.fl_str_mv 2021
dc.description.abstract.none.fl_txt_mv The delay-time distribution (DTD) is the occurrence rate of a class of objects as a function of time after a hypothetical burst of star formation. DTDs are mainly used as a statistical test of stellar evolution scenarios for supernova progenitors, but they can be applied to many other classes of astronomical objects. We calculate the first DTD for RR Lyrae variables using 29,810 RR Lyrae from the OGLE-IV survey and a map of the stellar age distribution (SAD) in the Large Magellanic Cloud (LMC). We find that ∼46% of the OGLE-IV RR Lyrae are associated with delay times greater than 8 Gyr (main-sequence progenitor masses less than 1 M⊙), and consistent with existing constraints on their ages, but surprisingly about 51% of RR Lyrae appear to have delay times of 1.2–8 Gyr (main-sequence masses between 1 and 2 M⊙ at LMC metallicity). This intermediate-age signal also persists outside the Bar region, where crowding is less of a concern, and we verified that without this signal the spatial distribution of the OGLE-IV RR Lyrae is inconsistent with the SAD map of the LMC. Since an intermediate-age RR Lyrae channel is in tension with the lack of RR Lyrae in intermediate-age clusters (noting issues with small-number statistics), and noting the age–metallicity constraints on LMC stars, our DTD result possibly indicates that systematic uncertainties may still exist in SAD measurements of old stellar populations, perhaps stemming from the construction methodology or the stellar evolution models used. We describe tests to further investigate this issue.
dc.format.extent.es.fl_str_mv 15 h.
dc.format.mimetype.es.fl_str_mv application/pdf
dc.identifier.citation.es.fl_str_mv Sarbadhicary, S, Heiger, M, Badenes, C, [y otros autores] "The RR Lyrae delay-time distribution: a novel perspective on models of old stellar populations". The Astronomical Journal. [en línea] 2021, 912(2): 140 15 h. DOI:10.3847/1538-4357/abca86.
dc.identifier.doi.none.fl_str_mv 10.3847/1538-4357/abca86
dc.identifier.issn.none.fl_str_mv 0004-6256
dc.identifier.uri.none.fl_str_mv https://hdl.handle.net/20.500.12008/42197
dc.language.iso.none.fl_str_mv en
eng
dc.publisher.es.fl_str_mv IOP
dc.relation.ispartof.es.fl_str_mv The Astronomical Journal, 2021, 912(2): 140
dc.rights.license.none.fl_str_mv Licencia Creative Commons Atribución (CC - By 4.0)
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
dc.source.none.fl_str_mv reponame:COLIBRI
instname:Universidad de la República
instacron:Universidad de la República
dc.subject.other.es.fl_str_mv RR LYRAE VARIABLE STARS
LARGE MAGELLANIC CLOUD
STELLAR POPULATIONS
STELLAR EVOLUTION
STELLAR EVOLUTIONARY MODELS
HORIZONTAL BRANCH
STELLAR AGES
STELLAR PULSATIONS
HERTZSPRUNG RUSSELL DIAGRAM
dc.title.none.fl_str_mv The RR Lyrae delay-time distribution: a novel perspective on models of old stellar populations
dc.type.es.fl_str_mv Artículo
dc.type.none.fl_str_mv info:eu-repo/semantics/article
dc.type.version.none.fl_str_mv info:eu-repo/semantics/publishedVersion
description The delay-time distribution (DTD) is the occurrence rate of a class of objects as a function of time after a hypothetical burst of star formation. DTDs are mainly used as a statistical test of stellar evolution scenarios for supernova progenitors, but they can be applied to many other classes of astronomical objects. We calculate the first DTD for RR Lyrae variables using 29,810 RR Lyrae from the OGLE-IV survey and a map of the stellar age distribution (SAD) in the Large Magellanic Cloud (LMC). We find that ∼46% of the OGLE-IV RR Lyrae are associated with delay times greater than 8 Gyr (main-sequence progenitor masses less than 1 M⊙), and consistent with existing constraints on their ages, but surprisingly about 51% of RR Lyrae appear to have delay times of 1.2–8 Gyr (main-sequence masses between 1 and 2 M⊙ at LMC metallicity). This intermediate-age signal also persists outside the Bar region, where crowding is less of a concern, and we verified that without this signal the spatial distribution of the OGLE-IV RR Lyrae is inconsistent with the SAD map of the LMC. Since an intermediate-age RR Lyrae channel is in tension with the lack of RR Lyrae in intermediate-age clusters (noting issues with small-number statistics), and noting the age–metallicity constraints on LMC stars, our DTD result possibly indicates that systematic uncertainties may still exist in SAD measurements of old stellar populations, perhaps stemming from the construction methodology or the stellar evolution models used. We describe tests to further investigate this issue.
eu_rights_str_mv openAccess
format article
id COLIBRI_cb0402a764b59ace0415f44feb4255ef
identifier_str_mv Sarbadhicary, S, Heiger, M, Badenes, C, [y otros autores] "The RR Lyrae delay-time distribution: a novel perspective on models of old stellar populations". The Astronomical Journal. [en línea] 2021, 912(2): 140 15 h. DOI:10.3847/1538-4357/abca86.
0004-6256
10.3847/1538-4357/abca86
instacron_str Universidad de la República
institution Universidad de la República
instname_str Universidad de la República
language eng
language_invalid_str_mv en
network_acronym_str COLIBRI
network_name_str COLIBRI
oai_identifier_str oai:colibri.udelar.edu.uy:20.500.12008/42197
publishDate 2021
reponame_str COLIBRI
repository.mail.fl_str_mv mabel.seroubian@seciu.edu.uy
repository.name.fl_str_mv COLIBRI - Universidad de la República
repository_id_str 4771
rights_invalid_str_mv Licencia Creative Commons Atribución (CC - By 4.0)
spelling Sarbadhicary Sumit K.Heiger MaireadBadenes CarlesMateu Cecilia, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Física.Newman Jeffrey A.Ciardullo RobinHallakoun Na’amaMaoz DanChomiuk Laura2024-01-12T15:31:52Z2024-01-12T15:31:52Z2021Sarbadhicary, S, Heiger, M, Badenes, C, [y otros autores] "The RR Lyrae delay-time distribution: a novel perspective on models of old stellar populations". The Astronomical Journal. [en línea] 2021, 912(2): 140 15 h. DOI:10.3847/1538-4357/abca86.0004-6256https://hdl.handle.net/20.500.12008/4219710.3847/1538-4357/abca86The delay-time distribution (DTD) is the occurrence rate of a class of objects as a function of time after a hypothetical burst of star formation. DTDs are mainly used as a statistical test of stellar evolution scenarios for supernova progenitors, but they can be applied to many other classes of astronomical objects. We calculate the first DTD for RR Lyrae variables using 29,810 RR Lyrae from the OGLE-IV survey and a map of the stellar age distribution (SAD) in the Large Magellanic Cloud (LMC). We find that ∼46% of the OGLE-IV RR Lyrae are associated with delay times greater than 8 Gyr (main-sequence progenitor masses less than 1 M⊙), and consistent with existing constraints on their ages, but surprisingly about 51% of RR Lyrae appear to have delay times of 1.2–8 Gyr (main-sequence masses between 1 and 2 M⊙ at LMC metallicity). This intermediate-age signal also persists outside the Bar region, where crowding is less of a concern, and we verified that without this signal the spatial distribution of the OGLE-IV RR Lyrae is inconsistent with the SAD map of the LMC. Since an intermediate-age RR Lyrae channel is in tension with the lack of RR Lyrae in intermediate-age clusters (noting issues with small-number statistics), and noting the age–metallicity constraints on LMC stars, our DTD result possibly indicates that systematic uncertainties may still exist in SAD measurements of old stellar populations, perhaps stemming from the construction methodology or the stellar evolution models used. We describe tests to further investigate this issue.Submitted by Parodi Mónica (mparodi@fcien.edu.uy) on 2024-01-11T17:47:24Z No. of bitstreams: 2 license_rdf: 24251 bytes, checksum: 71ed42ef0a0b648670f707320be37b90 (MD5) 10384715384357abca86.pdf: 4507287 bytes, checksum: 56454719a9216675baf0820bfbd529b7 (MD5)Approved for entry into archive by Faget Cecilia (lfaget@fcien.edu.uy) on 2024-01-12T14:44:08Z (GMT) No. of bitstreams: 2 license_rdf: 24251 bytes, checksum: 71ed42ef0a0b648670f707320be37b90 (MD5) 10384715384357abca86.pdf: 4507287 bytes, checksum: 56454719a9216675baf0820bfbd529b7 (MD5)Made available in DSpace by Luna Fabiana (fabiana.luna@seciu.edu.uy) on 2024-01-12T15:31:52Z (GMT). No. of bitstreams: 2 license_rdf: 24251 bytes, checksum: 71ed42ef0a0b648670f707320be37b90 (MD5) 10384715384357abca86.pdf: 4507287 bytes, checksum: 56454719a9216675baf0820bfbd529b7 (MD5) Previous issue date: 202115 h.application/pdfenengIOPThe Astronomical Journal, 2021, 912(2): 140Las obras depositadas en el Repositorio se rigen por la Ordenanza de los Derechos de la Propiedad Intelectual de la Universidad de la República.(Res. Nº 91 de C.D.C. de 8/III/1994 – D.O. 7/IV/1994) y por la Ordenanza del Repositorio Abierto de la Universidad de la República (Res. Nº 16 de C.D.C. de 07/10/2014)info:eu-repo/semantics/openAccessLicencia Creative Commons Atribución (CC - By 4.0)RR LYRAE VARIABLE STARSLARGE MAGELLANIC CLOUDSTELLAR POPULATIONSSTELLAR EVOLUTIONSTELLAR EVOLUTIONARY MODELSHORIZONTAL BRANCHSTELLAR AGESSTELLAR PULSATIONSHERTZSPRUNG RUSSELL DIAGRAMThe RR Lyrae delay-time distribution: a novel perspective on models of old stellar populationsArtículoinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionreponame:COLIBRIinstname:Universidad de la Repúblicainstacron:Universidad de la RepúblicaSarbadhicary, Sumit K.Heiger, MaireadBadenes, CarlesMateu, CeciliaNewman, Jeffrey A.Ciardullo, RobinHallakoun, Na’amaMaoz, DanChomiuk, LauraLICENSElicense.txtlicense.txttext/plain; charset=utf-84267http://localhost:8080/xmlui/bitstream/20.500.12008/42197/5/license.txt6429389a7df7277b72b7924fdc7d47a9MD55CC-LICENSElicense_urllicense_urltext/plain; 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- Universidad de la Repúblicafalse
spellingShingle The RR Lyrae delay-time distribution: a novel perspective on models of old stellar populations
Sarbadhicary, Sumit K.
RR LYRAE VARIABLE STARS
LARGE MAGELLANIC CLOUD
STELLAR POPULATIONS
STELLAR EVOLUTION
STELLAR EVOLUTIONARY MODELS
HORIZONTAL BRANCH
STELLAR AGES
STELLAR PULSATIONS
HERTZSPRUNG RUSSELL DIAGRAM
status_str publishedVersion
title The RR Lyrae delay-time distribution: a novel perspective on models of old stellar populations
title_full The RR Lyrae delay-time distribution: a novel perspective on models of old stellar populations
title_fullStr The RR Lyrae delay-time distribution: a novel perspective on models of old stellar populations
title_full_unstemmed The RR Lyrae delay-time distribution: a novel perspective on models of old stellar populations
title_short The RR Lyrae delay-time distribution: a novel perspective on models of old stellar populations
title_sort The RR Lyrae delay-time distribution: a novel perspective on models of old stellar populations
topic RR LYRAE VARIABLE STARS
LARGE MAGELLANIC CLOUD
STELLAR POPULATIONS
STELLAR EVOLUTION
STELLAR EVOLUTIONARY MODELS
HORIZONTAL BRANCH
STELLAR AGES
STELLAR PULSATIONS
HERTZSPRUNG RUSSELL DIAGRAM
url https://hdl.handle.net/20.500.12008/42197