Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/26896
DC Field | Value | Language |
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dc.contributor.author | Brown, T. M. | en_US |
dc.contributor.author | Taylor, J. M. | en_US |
dc.contributor.author | CASSISI, Santi | en_US |
dc.contributor.author | Sweigart, A. V. | en_US |
dc.contributor.author | Bellini, A. | en_US |
dc.contributor.author | BEDIN, Luigi | en_US |
dc.contributor.author | Salaris, M. | en_US |
dc.contributor.author | Renzini, A. | en_US |
dc.contributor.author | Dalessandro, Emanuele | en_US |
dc.date.accessioned | 2020-08-27T14:24:58Z | - |
dc.date.available | 2020-08-27T14:24:58Z | - |
dc.date.issued | 2017 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/26896 | - |
dc.description.abstract | In the color-magnitude diagrams of globular clusters, when the locus of stars on the horizontal branch extends to hot temperatures, discontinuities are observed at colors corresponding to ∼12,000 and ∼18,000 K. The former is the “Grundahl jump” that is associated with the onset of radiative levitation in the atmospheres of hot subdwarfs. The latter is the “Momany jump” that has remained unexplained. Using the Space Telescope Imaging Spectrograph on the Hubble Space Telescope, we have obtained ultraviolet and blue spectroscopy of six hot subdwarfs straddling the Momany jump in the massive globular cluster ω Cen. By comparison to model atmospheres and synthetic spectra, we find that the feature is due primarily to a decrease in atmospheric Fe for stars hotter than the feature, amplified by the temperature dependence of the Fe absorption at these effective temperatures. <P />Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program GO-14759. | en_US |
dc.language.iso | eng | en_US |
dc.title | A Universal Transition in Atmospheric Diffusion for Hot Subdwarfs Near 18,000 K | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/1538-4357/aa9ce3 | en_US |
dc.identifier.scopus | 2-s2.0-85039749871 | en_US |
dc.identifier.isi | 000418382600004 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/1538-4357/aa9ce3 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 851 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 118 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 9 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | THE ASTROPHYSICAL JOURNAL | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2017ApJ...851..118B | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.grantfulltext | open | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
item.cerifentitytype | Publications | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
crisitem.author.dept | O.A. Abruzzo | - |
crisitem.author.dept | O.A. Padova | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.orcid | 0000-0001-5870-3735 | - |
crisitem.author.orcid | 0000-0003-4080-6466 | - |
crisitem.author.orcid | 0000-0003-4237-4601 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
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Brown_2017_ApJ_851_118.pdf | pdf editoriale | 2.83 MB | Adobe PDF | View/Open |
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