{"id":151,"date":"2012-07-09T09:58:08","date_gmt":"2012-07-09T14:58:08","guid":{"rendered":"http:\/\/people.brandonu.ca\/gulliver\/?page_id=151"},"modified":"2012-07-09T13:33:49","modified_gmt":"2012-07-09T18:33:49","slug":"abstract-optical-spectrum-hr-4049","status":"publish","type":"page","link":"https:\/\/people.brandonu.ca\/gulliver\/publications\/abstract-optical-spectrum-hr-4049\/","title":{"rendered":"Abstract: The Optical Spectrum of HR 4049."},"content":{"rendered":"<p>High-resolution optical spectra (UES\/WHT) of the extreme metal-poor post-AGB star HR 4049 were obtained at four different orbital phases. The spectra cover the wavelength region from 3650A to 10850A at a resolution of R=52000. These observations are supplemented with four high-resolution spectra of the NaI D1 &#038; D2 and CaII K lines at R=~105 (CAT\/CES). The optical spectrum shows 217 spectral lines: the Balmer series (H{alpha} &#8211; H35), the Paschen series (P9 -P23), NI, OI and numerous CI lines. We show that the lines of H{alpha}, H{beta}, H{gamma} and NaI D show significant changes in profile between different observation dates. Nine components were identified in the profile of the NaI D lines of which three are circumstellar and six interstellar. The stronger CI lines are asymmetric and we derive a post-AGB mass-loss of {dot}(M)=6\u00b14&#215;10-7M{sun}\/yr from the asymmetry. The [OI]6300A line has been detected in emission at the system velocity and we argue that the emission is from an almost edge-on disk with a radius of about 20R*. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>High-resolution optical spectra (UES\/WHT) of the extreme metal-poor post-AGB star HR 4049 were obtained at four different orbital phases. The spectra cover the wavelength region from 3650A to 10850A at a resolution of R=52000. These observations are supplemented with four high-resolution spectra of the NaI D1 &#038; D2 and CaII K lines at R=~105 (CAT\/CES). [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":8,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-151","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/people.brandonu.ca\/gulliver\/wp-json\/wp\/v2\/pages\/151","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/people.brandonu.ca\/gulliver\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/people.brandonu.ca\/gulliver\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/people.brandonu.ca\/gulliver\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/people.brandonu.ca\/gulliver\/wp-json\/wp\/v2\/comments?post=151"}],"version-history":[{"count":3,"href":"https:\/\/people.brandonu.ca\/gulliver\/wp-json\/wp\/v2\/pages\/151\/revisions"}],"predecessor-version":[{"id":185,"href":"https:\/\/people.brandonu.ca\/gulliver\/wp-json\/wp\/v2\/pages\/151\/revisions\/185"}],"up":[{"embeddable":true,"href":"https:\/\/people.brandonu.ca\/gulliver\/wp-json\/wp\/v2\/pages\/8"}],"wp:attachment":[{"href":"https:\/\/people.brandonu.ca\/gulliver\/wp-json\/wp\/v2\/media?parent=151"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}