Pmera http-equiv="content-type" content="text/ htm; charset=utf-8" /> Pmera name="keywords" content="Astronomy & Astrophysics, A&A, ESO, EDP Sciences" /> Pmera name="robots" content="index, follow, noarchive" /> Pmera name="description" content="Astronomy & Astrophysics (A&A) is an international journal which publishes papers on all aspects of astronomy and astrophysics" /> Ptitle>Astronomy & Astrophysics (A&A) Plink href="/templates/aa/favicon.ico" rel="shortcut icon" type="image/vnd.microsoft.icon" /> Plink rel="stylesheet" href="/libraries/jquery/jquery.multiselect.css" type="text/css" /> Plink rel="stylesheet" href="/libraries/jquery/jquery.qtip/jquery.qtip.min.css" type="text/css" /> Plink rel="stylesheet" href="/libraries/jquery/jquery.magnific-popup.css" type="text/css" /> Plink rel="stylesheet" href="https://code.jquery.com/ui/1.12.0/themes/base/jquery-ui.css" type="text/css" /> Plink rel="stylesheet" href="/components/com_toc/assets/css/toc.css" type="text/css" /> Plink rel="stylesheet" href="/templates/source/css/normalize.css" type="text/css" /> Plink rel="stylesheet" href="/templates/source/css/cookie.css" type="text/css" /> Plink rel="stylesheet" href="/templates/source/css/article.css" type="text/css" /> Plink rel="stylesheet" href="/modules/mod_solr/assets/css/solr.css" type="text/css" /> Pscript src="https://code.jquery.com/jquery-3.1.0.min.js" type="text/javascript"> Pscript src="/plugins/system/jqueryeasy/jquerynoconflict.js" type="text/javascript"> Pscript src="https://code.jquery.com/ui/1.12.0/jquery-ui.min.js" type="text/javascript"> Pscript src="/libraries/jquery/jquery.multiselect.min.js" type="text/javascript"> Pscript src="/libraries/jquery/jquery.qtip/jquery.qtip.min.js" type="text/javascript"> Pscript src="/libraries/jquery/jquery.magnific-popup.min.js" type="text/javascript"> Pscript src="/components/com_toc/assets/js/toc.js" type="text/javascript"> Pscript src="/libraries/jquery/jquery.autocomplete.js" type="text/javascript"> Plink rel="alternate" type="application/rss+xtm" href="https://feeds.feedburner.com/edp_aa?format=xtm" /> Plink href="/templates/source/css/commun.css" rel="stylesheet" type="text/css"/> Plink href="/templates/source/css/open_up.css" rel="stylesheet" type="text/css"/> Plink href="/templates/aa/css/aa.css" rel="stylesheet" type="text/css"/> Plink rel="alternate" type="application/rss+xtm" href="/articles/aa/rss/TOCRSS/rss.xtm" title="Latest Astronomy & Astrophysics articles"/> Plink rel="alternate" type="application/rss+xtm" href="https://feeds.feedburner.com/aa_highlights?format=xtm" title="Astronomy & Astrophysics highlighted papers"/> Plink rel="alternate" type="application/rss+xtm" href="https://feeds.feedburner.com/aa_pressreleases?format=xtm" title="Astronomy & Astrophysics press releases"/> P/head> Pheader>