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dc.contributor.authorValdivielso, L.
dc.contributor.authorMartin, E.L.
dc.contributor.authorBouy, H.
dc.contributor.authorSolano, E.
dc.contributor.authorDrew, J.E.
dc.contributor.authorGreimel, R.
dc.contributor.authorGutierrez, R.
dc.contributor.authorUnruh, Y.C.
dc.contributor.authorVink, J.S.
dc.date.accessioned2009-05-12T13:37:24Z
dc.date.available2009-05-12T13:37:24Z
dc.date.issued2009
dc.identifier.citationValdivielso , L , Martin , E L , Bouy , H , Solano , E , Drew , J E , Greimel , R , Gutierrez , R , Unruh , Y C & Vink , J S 2009 , ' An IPHAS-based search for accreting very low-mass objects using VO tools ' , Astronomy and Astrophysics , vol. 497 , no. 3 , pp. 973-981 . https://doi.org/10.1051/0004-6361/200810256
dc.identifier.issn0004-6361
dc.identifier.otherPURE: 181622
dc.identifier.otherPURE UUID: 7c170135-d5f3-4ec1-a28f-1dbd73d61dea
dc.identifier.otherdspace: 2299/3363
dc.identifier.otherScopus: 65249135924
dc.identifier.urihttp://hdl.handle.net/2299/3363
dc.descriptionOriginal article can be found at: http://www.aanda.org/ Copyright The European Southern Observatory (ESO) DOI: 10.1051/0004-6361/200810256
dc.description.abstractContext. The main goal of this paper is to prove that accreting very low-mass stars and brown dwarfs can be identified in IPHAS, an H emission survey of the northern Milky Way. Full exploitation of the IPHAS database and a future extension of it in the southern hemisphere will be useful in identifying very low-mass accreting objects near to and far from well-known star-forming regions. Aims. We have used Virtual Observatory tools to cross-match the IPHAS catalogue with the 2MASS catalogue. We defined photometric criteria to identify H emission sources with near-infrared colours similar to those of known young very low-mass stars and brown dwarfs. 4000 candidates were identified that met our criteria over an area of 1600 square degrees. We present low-resolution optical spectra of 113 candidates. Spectral types have been derived for the 33 candidates that have spectroscopically confirmed H emission, negligible reddening and spectral class M. We have also measured H emission and investigated the NaI doublet (818.3 nm, 819.5 nm) in these 33 objects. Methods. We confirm that 33 IPHAS candidates have strong H emission indicative of disc accretion for their spectral type. Twenty-three of them have spectral class M4 or later, of which ten have classes in the range M5.5–M7.0 and could thus be very young brown dwarfs. Many objects also have a weak NaI doublet, an indication of low surface gravity. Results. IPHAS provides a very valuable database for identifying accreting very low-mass stars and brown dwarfs. Virtual Observatory tools provide an efficient method for identifying these objects over large areas of the sky. Based on our success rate of 23 H emission objects with spectral type in the range M4–M7 out of 113 candidates with spectroscopic follow-up, we estimate that there could be hundreds of such objects in the full IPHAS survey.en
dc.language.isoeng
dc.relation.ispartofAstronomy and Astrophysics
dc.rightsOpen
dc.titleAn IPHAS-based search for accreting very low-mass objects using VO toolsen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dcterms.dateAccepted2009
rioxxterms.versionofrecordhttps://doi.org/10.1051/0004-6361/200810256
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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