Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/34645
DC Field | Value | Language |
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dc.contributor.author | Bertone, E. | en_US |
dc.contributor.author | BUZZONI, Alberto | en_US |
dc.contributor.author | Chávez, M. | en_US |
dc.contributor.author | Rodríguez-Merino, L. H. | en_US |
dc.date.accessioned | 2024-01-29T15:19:21Z | - |
dc.date.available | 2024-01-29T15:19:21Z | - |
dc.date.issued | 2008 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/34645 | - |
dc.description.abstract | Aims: The fast improvement of spectroscopic observations makes mandatory a strong effort on the theoretical side to better reproduce the spectral energy distribution (SED) of stars at high spectral resolution. In this regard, relying on the Kurucz Atlas/Synthe original codes we computed the Bluered library, consisting of 832 synthetic SED of stars, that cover a large parameter space at very high spectral resolution (R = 500 000) along the 3500-7000 Å wavelength range. <BR />Methods: Bluered synthetic spectra have been used to assess in finer detail the intrinsic reliability and the performance limits of the Atlas theoretical framework. The continuum-normalized spectra of the <ASTROBJ>Sun</ASTROBJ>, <ASTROBJ>Arcturus</ASTROBJ>, and <ASTROBJ>Vega</ASTROBJ>, plus a selected list of 45 bright stars with high-quality SEDs from the Prugniel & Soubiran Elodie catalog, form our sample designed to probe the global properties of synthetic spectra across the entire range of H-R parameters. <BR />Results: Atlas models display a better fitting performance with increasing stellar temperature. High-resolution spectra of Vega, the Sun, and Arcturus have been reproduced at R=100 000, respectively, within a 0.7%, 4.5%, and 8.8% relative scatter in residual flux. In all the three cases, the residual flux distribution shows a significant asymmetry (skewness parameter γ = -2.21, -0.98, -0.67, respectively), which neatly confirms an overall “excess” of theoretical line blanketing. For the Sun, this apparent discrepancy is alleviated, but not recovered, by a systematic decrease (-40%) of the line oscillator strengths, log (gf), especially referring to iron transitions. Definitely, a straight “astrophysical” determination of log (gf) for each individual atomic transition has to be devised to overcome the problem. By neglecting overblanketing effects in theoretical models when fitting high-resolution continuum-normalized spectra of real stars, we lead to a systematically warmer effective temperature (between +80 and +300 K for the solar fit) and a slightly poorer metal content. | en_US |
dc.language.iso | eng | en_US |
dc.title | Probing Atlas model atmospheres at high spectral resolution. Stellar synthesis and reference template validation | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361:20078923 | en_US |
dc.identifier.scopus | 2-s2.0-53449085730 | en_US |
dc.identifier.url | https://api.elsevier.com/content/abstract/scopus_id/53449085730 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/abs/2008/27/aa8923-07/aa8923-07.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 485 | en_US |
dc.relation.issue | 3 | en_US |
dc.relation.firstpage | 823 | en_US |
dc.relation.lastpage | 835 | en_US |
dc.type.referee | REF_1 | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | ASTRONOMY & ASTROPHYSICS | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2008A&A...485..823B | 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.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.orcid | 0000-0002-6514-1870 | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
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aa8923-07.pdf | PDF editoriale | 3.09 MB | Adobe PDF | View/Open |
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