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The sdA problem : II. Photometric and spectroscopic follow-up

dc.contributor.authorPelisoli, Ingrid Domingospt_BR
dc.contributor.authorKepler, Souza Oliveirapt_BR
dc.contributor.authorKoester, Detlevpt_BR
dc.contributor.authorCastanheira, Bárbara Garciapt_BR
dc.contributor.authorRomero, Alejandra Danielapt_BR
dc.contributor.authorFraga, Lucianopt_BR
dc.date.accessioned2018-09-26T02:33:37Zpt_BR
dc.date.issued2018pt_BR
dc.identifier.issn0035-8711pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/182665pt_BR
dc.description.abstractThe spectral classification ‘subdwarfA’ (sdA) is given to stars showingH-rich spectra and submain- sequence surface gravities, but effective temperature lower than the zero-age horizontal branch. Their evolutionary origin is an enigma. In this work, we discuss the results of followup observations of selected sdAs. We obtained time-resolved spectroscopy for 24 objects and time-series photometry for another 19 objects. For two targets, we report both spectroscopy and photometry observations. We confirm seven objects to be new extremely low-mass white dwarfs (ELMs), one of which is a known eclipsing star.We also find the eighth member of the pulsating ELM class.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofMonthly notices of the royal astronomical society. Oxford. Vol. 478, no. 1 (July 2018), p. 867–884pt_BR
dc.rightsOpen Accessen
dc.subjectAnãs brancaspt_BR
dc.subjectSubdwarfsen
dc.subjectBinaries: generalen
dc.subjectEvolucao estelarpt_BR
dc.subjectEstrelas binariaspt_BR
dc.subjectStars: evolutionen
dc.subjectWhite dwarfsen
dc.titleThe sdA problem : II. Photometric and spectroscopic follow-uppt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001074986pt_BR
dc.type.originEstrangeiropt_BR


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