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X-ray variability of sigma Orionis young stars as observed with rosar

dc.contributor.authorCaballero, J. A.
dc.contributor.authorLópez Santiago, J.
dc.contributor.authorCastro Rubio, Elisa De
dc.contributor.authorCornide Castro-Piñeiro, Manuel
dc.date.accessioned2023-06-20T03:53:32Z
dc.date.available2023-06-20T03:53:32Z
dc.date.issued2009-06
dc.description© 2009. The American Astronomical Society. All rights reserved. We are grateful to the anonymous referee, J. F. Albacete Colombo, and J. Sánz Forcada for helpful discussion and advice. Financial support was provided by the Universidad Complutense de Madrid, the Comunidad Autónoma de Madrid, the Spanish Ministerio Educación y Ciencia, and the European Social Fund under grants: AyA200502750, AyA2005-04286, AyA2005-24102-E, AyA2008-06423C03-03, AyA2008-00695, PRICITS-0505/ESP-0237, and CSD2006-0070. This research has made use of the SIMBAD, operated at Centre de Données astronomiques de Strasbourg, France, and the NASA's Astrophysics Data System.
dc.description.abstractWe used the Aladin Virtual Observatory tool and High Resolution Imager ROSAT archival data to search for X-ray variability in scale of days in 23 young stars in the sigma Orionis cluster and a background galaxy. Five stars displayed unambiguous flares and had probabilities p(var) >> 99% of being actual variables. Two of the detected flares were violent and long lasting, with maximum duration of six days and amplitude of eight times above the quiescent level. We classified another four stars as possible X-ray variables, including the binary system formed by the B2Vp star sigma Ori E and its close late-type companion. This makes a minimum frequency of high-amplitude X-ray variability in excess of a day of 39% among sigma Orionis stars. The incidence of this kind of X-ray variability seems to be lower among classical T Tauri stars with mid-infrared flux excesses than among fast-rotating, disk-less young stars.
dc.description.departmentDepto. de Física de la Tierra y Astrofísica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipUniversidad Complutense de Madrid
dc.description.sponsorshipComunidad Autónoma de Madrid
dc.description.sponsorshipSpanish Ministerio Educación y Ciencia
dc.description.sponsorshipEuropean Social Fund
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/30760
dc.identifier.doi10.1088/0004-6256/137/6/5012
dc.identifier.issn0004-6256
dc.identifier.officialurlhttp://dx.doi.org/10.1088/0004-6256/137/6/5012
dc.identifier.relatedurlhttp://iopscience.iop.org/
dc.identifier.urihttps://hdl.handle.net/20.500.14352/44625
dc.issue.number6
dc.journal.titleAstronomical journal
dc.language.isoeng
dc.page.final5021
dc.page.initial5012
dc.publisherIOP Publishing ltd
dc.relation.projectIDAyA200502750
dc.relation.projectIDAyA2005-04286
dc.relation.projectIDAyA2005-24102-E
dc.relation.projectIDAyA2008-06423C03-03
dc.relation.projectIDAyA2008-00695
dc.relation.projectIDPRICITS-0505/ESP-0237
dc.relation.projectIDCSD2006-0070
dc.rights.accessRightsopen access
dc.subject.cdu52
dc.subject.keywordMain-sequence stars
dc.subject.keywordT-tauri stars
dc.subject.keywordSerendipitous source catalog
dc.subject.keywordXMM-Newton observations
dc.subject.keywordAll-sky survey
dc.subject.keywordBrown dwarfs
dc.subject.keywordResolution spectroscopy
dc.subject.keywordEnergy-distributions
dc.subject.keywordMolecular cloud
dc.subject.keywordSpace-telescope
dc.subject.ucmAstrofísica
dc.subject.ucmAstronomía (Física)
dc.titleX-ray variability of sigma Orionis young stars as observed with rosar
dc.typejournal article
dc.volume.number137
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