{"refrec":{"BRefID":303384,"RR":"<b>Aleman, I.; Ueta, T.; Ladjal, D.; Exter, K.M.; Kastner, J.H.; Montez, R.; Tielens, A.G.G.M.; Chu, Y.-H.; Izumiura, H.; McDonald, I.; Sahai, R.; Siódmiak, N.; Szczerba, R.; van Hoof, P.A.M.; Villaver, E.; Vlemmings, W.; Wittkowski, M.; Zijlstra, A.A.</b> (2014). <i>Herschel</i> Planetary Nebula Survey (HerPlaNS): first detection of OH<sup>+</sup> in planetary nebulae. <i>Astron. Astrophys. 566</i>: A79. <a href=\"https://dx.doi.org/10.1051/0004-6361/201322940\" target=\"_blank\">https://dx.doi.org/10.1051/0004-6361/201322940</a>","BEntID":295678,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Astron. Astrophys. 566</i>: A79. <a href=\"https://dx.doi.org/10.1051/0004-6361/201322940\" target=\"_blank\">https://dx.doi.org/10.1051/0004-6361/201322940</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Aleman, I.; Ueta, T.; Ladjal, D.; Exter, K.M.; Kastner, J.H.; Montez, R.; Tielens, A.G.G.M.; Chu, Y.-H.; Izumiura, H.; McDonald, I.; Sahai, R.; Siódmiak, N.; Szczerba, R.; van Hoof, P.A.M.; Villaver, E.; Vlemmings, W.; Wittkowski, M.; Zijlstra, A.A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Aleman, I. <i>et al.</i>","Englishabstract":"<i>Aims. </i>We report the first detections of OH<span class=\"simple-math\"><sup>+</sup></span> emission in planetary nebulae (PNe).</p>        <p><i>Methods. </i>As part of an imaging and spectroscopy survey of 11 PNe in the far-IR using the PACS and SPIRE instruments aboard the <i>Herschel </i>Space Observatory, we performed a line survey in these PNe over the entire spectral range between 51<span class=\"simple-math\"><i>μ</i></span>m and 672<span class=\"simple-math\"><i>μ</i></span>m to look for new detections.</p>        <p><i>Results. </i>The rotational emission lines of OH<span class=\"simple-math\"><sup>+</sup></span> at 152.99, 290.20, 308.48, and 329.77<span class=\"simple-math\"><i>μ</i></span>m were detected in the spectra of three planetary nebulae: NGC 6445, NGC 6720, and NGC 6781. Excitation temperatures and column densities derived from these lines are in the range of 27–47 K and 2 <span class=\"simple-math\">×</span> 10<span class=\"simple-math\"><sup>10</sup></span>–4 <span class=\"simple-math\">×</span> 10<span class=\"simple-math\"><sup>11</sup></span> cm<span class=\"simple-math\"><sup>-2</sup></span>, respectively.</p>        <p><i>Conclusions. </i>In PNe, the OH<span class=\"simple-math\"><sup>+</sup></span> rotational line emission appears to be produced in the photodissociation region (PDR) in these objects. The emission of OH<span class=\"simple-math\"><sup>+</sup></span> is observed only in PNe with hot central stars (<span class=\"simple-math\"><i>T</i><sub>eff</sub>&gt;</span> 100 000 K), suggesting that high-energy photons may play a role in OH<span class=\"simple-math\"><sup>+</sup></span> formation and its line excitation in these objects, as seems to be the case for ultraluminous galaxies.</p>","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"<i>Herschel</i> Planetary Nebula Survey (HerPlaNS): first detection of OH<sup>+</sup> in planetary nebulae","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-20 01:32:29.373847","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"astrochemistry / circumstellar matter / planetary nebulae: general / planetary nebulae: individual: NGC 6445 / planetary nebulae: individual: NGC 6720 / planetary nebulae: individual: NGC 6781","OtherDescriptors":null,"Notes":null,"AnaPub":2014,"MonPub":null,"DateUpdate":"2018-11-28","DateCreate":"2018-11-28","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000338681500045","VABBcode":null,"OpenAcc":1,"DOI":"10.1051/0004-6361/201322940"},"refs":null,"anarec":{"AnaID":303384,"PubliDate":2014,"Pagination":"A79","XtraPublOfAnaID":null,"ISBN":null,"Volume":"566","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":233536,"SerRR":"Astronomy & Astrophysics (Les Ulis). 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