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A puzzle involving galactic bulge microlensing events

Cohen, Judith G; Gould, A; Thompson, Ian; Feltzing, Sofia; Bensby, T; Johnson, Jennifer A; Huang, Wenjin; Melendez, Jorge; Lucatello, Sara; Asplund, Martin

Description

We study a sample of 16 microlensed Galactic bulge main-sequence turnoff region stars for which high-dispersion spectra have been obtained with detailed abundance analyses. We demonstrate that there is a very strong and highly statistically significant correlation between the maximum magnification of the microlensed bulge star and the value of the [Fe/H] deduced from the high resolution spectrum of each object. Physics demands that this correlation, assuming it to be real, be the result of some...[Show more]

dc.contributor.authorCohen, Judith G
dc.contributor.authorGould, A
dc.contributor.authorThompson, Ian
dc.contributor.authorFeltzing, Sofia
dc.contributor.authorBensby, T
dc.contributor.authorJohnson, Jennifer A
dc.contributor.authorHuang, Wenjin
dc.contributor.authorMelendez, Jorge
dc.contributor.authorLucatello, Sara
dc.contributor.authorAsplund, Martin
dc.date.accessioned2015-12-13T22:43:21Z
dc.identifier.issn2041-8205
dc.identifier.urihttp://hdl.handle.net/1885/79170
dc.description.abstractWe study a sample of 16 microlensed Galactic bulge main-sequence turnoff region stars for which high-dispersion spectra have been obtained with detailed abundance analyses. We demonstrate that there is a very strong and highly statistically significant correlation between the maximum magnification of the microlensed bulge star and the value of the [Fe/H] deduced from the high resolution spectrum of each object. Physics demands that this correlation, assuming it to be real, be the result of some sample bias. We suggest several possible explanations, but are forced to reject them all, and are left puzzled. To obtain a reliable metallicity distribution in the Galactic bulge based on microlensed dwarf stars, it will be necessary to resolve this issue through the course of additional observations.
dc.publisherInstitute of Physics Publishing Ltd.
dc.sourceAstrophysical Journal Letters
dc.subjectKeywords: Galaxy: bulge; Gravitational lensing: micro; Stars: abundances
dc.titleA puzzle involving galactic bulge microlensing events
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume711
dc.date.issued2010
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.ariespublicationf5625xPUB7672
local.type.statusPublished Version
local.contributor.affiliationCohen, Judith G, California Institute of Technology
local.contributor.affiliationGould, A, Ohio State University
local.contributor.affiliationThompson, Ian, Observatories of the Carnegie Institution of Washington
local.contributor.affiliationFeltzing, Sofia, Lund Observatory
local.contributor.affiliationBensby, T, European Southern Observatory
local.contributor.affiliationJohnson, Jennifer A, Ohio State University
local.contributor.affiliationHuang, Wenjin, University of Washington
local.contributor.affiliationMelendez, Jorge, Centro de Astrofisica da Universidade do Porto
local.contributor.affiliationLucatello, Sara, INAF, Osservatorio Astronomico di Padova
local.contributor.affiliationAsplund, Martin, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue1 (PART 2)
local.bibliographicCitation.startpageL48
local.bibliographicCitation.lastpageL52
local.identifier.doi10.1088/2041-8205/711/1/L48
dc.date.updated2016-02-24T09:36:25Z
local.identifier.scopusID2-s2.0-77949519341
local.identifier.thomsonID000275361700010
CollectionsANU Research Publications

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