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New R Coronae Borealis stars discovered in OGLE-III Galactic bulge fields from their mid- and near-infrared properties

Tisserand, Patrick; Wyrzykowski, L; Wood, Peter R; Udalski, A; Szymanski, M; Kubiak, M; Pietrzynski, G; Soszyński, Igor; Szewczyk, O; Ulaczyk, K; Poleski, R

Description

Context. An R Coronae Borealis (RCB) star is a rare type of supergiant star that is increasingly suspected to be the evolved merger product of two white dwarfs. Lately, many RCBs have been found distributed in a thin disk structure embedded inside the Galactic bulge. This unexpectedly high density may provide additional insight into the nature and age of RCB stars. Aims. We apply and test a new technique to find RCB stars based on their particular infrared emission due to circumstellar shell....[Show more]

dc.contributor.authorTisserand, Patrick
dc.contributor.authorWyrzykowski, L
dc.contributor.authorWood, Peter R
dc.contributor.authorUdalski, A
dc.contributor.authorSzymanski, M
dc.contributor.authorKubiak, M
dc.contributor.authorPietrzynski, G
dc.contributor.authorSoszyński, Igor
dc.contributor.authorSzewczyk, O
dc.contributor.authorUlaczyk, K
dc.contributor.authorPoleski, R
dc.date.accessioned2015-12-10T23:31:01Z
dc.identifier.issn0004-6361
dc.identifier.urihttp://hdl.handle.net/1885/68430
dc.description.abstractContext. An R Coronae Borealis (RCB) star is a rare type of supergiant star that is increasingly suspected to be the evolved merger product of two white dwarfs. Lately, many RCBs have been found distributed in a thin disk structure embedded inside the Galactic bulge. This unexpectedly high density may provide additional insight into the nature and age of RCB stars. Aims. We apply and test a new technique to find RCB stars based on their particular infrared emission due to circumstellar shell. We attempt to demonstrate that RCB stars can be identified without performing a light curve analysis, which would simplified the search outside optically monitored fields. Methods. We selected RCB candidates based on their near-infrared excess and on their particular mid-infrared shells emission, using photometric data from the 2MASS and Spitzer/GLIMPSE surveys. Each candidates OGLE light curves were then visually inspected and we selected for spectroscopy follow-up those that underwent large and rapid declines. Results. We discover two new R Coronae Borealis stars, but also indicate four new possible candidates. We emphasize that all of the 7 known RCB stars located in both the Spitzer/GLIMPSE and OGLE-III fields were also re-discovered, which illustrates the high efficiency of our analysis. Conclusions. The proposed new technique to find RCB stars has been successful. It can now be extended to larger areas, in particular where the interstellar extinction is too high to be monitored by optical microlensing surveys, such as the inner part of the Galactic bulge.
dc.publisherSpringer
dc.rightsAuthor/s retain copyright
dc.sourceAstronomy and Astrophysics
dc.subjectKeywords: Borealis; Circumstellar; Galactic bulge; Galaxy: bulge; High density; High efficiency; Infrared emissions; Interstellar extinction; Light curves; Micro-lensing; Midinfrared; Near Infrared; Photometric data; Stars: AGB and post-AGB; Stars: carbon; Supergia Galaxy: bulge; Stars: AGB and post-AGB; Stars: carbon; Supergiants
dc.titleNew R Coronae Borealis stars discovered in OGLE-III Galactic bulge fields from their mid- and near-infrared properties
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume529
dc.date.issued2011
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationf2965xPUB1710
local.type.statusPublished Version
local.contributor.affiliationTisserand, Patrick, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationWyrzykowski, L, University of Cambridge
local.contributor.affiliationWood, Peter R, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationUdalski, A, Warsaw University Observatory
local.contributor.affiliationSzymanski, M, Warsaw University Observatory
local.contributor.affiliationKubiak, M, Warsaw University Observatory
local.contributor.affiliationPietrzynski, G, Warsaw University
local.contributor.affiliationSoszyński, Igor, Warsaw University Observatory
local.contributor.affiliationSzewczyk, O, Warsaw University
local.contributor.affiliationUlaczyk, K, Warsaw University
local.contributor.affiliationPoleski, R, Warsaw University
local.bibliographicCitation.startpageA118
local.bibliographicCitation.lastpage10
local.identifier.doi10.1051/0004-6361/201014220
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2016-02-24T08:16:24Z
local.identifier.scopusID2-s2.0-79954528823
local.identifier.thomsonID000289557200126
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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