{"id":1661,"date":"2015-11-05T22:17:58","date_gmt":"2015-11-06T06:17:58","guid":{"rendered":"http:\/\/jazzistentialism.com\/blog\/?p=1661"},"modified":"2015-11-12T23:28:16","modified_gmt":"2015-11-13T07:28:16","slug":"lhires-iii-aply-600-resolution-comparison","status":"publish","type":"post","link":"http:\/\/jazzistentialism.com\/blog\/?p=1661","title":{"rendered":"Lhires III &#038; Alpy 600 resolution comparison"},"content":{"rendered":"<p>Several spectra of the star Fomalhaut acquired simultaneously with Lhires III and Alpy 600 spectroscopes illustrate the difference between high resolution and low resolution spectroscopy.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone wp-image-1662\" src=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-5.png\" alt=\"Canvas 5\" width=\"250\" height=\"166\" srcset=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-5.png 1343w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-5-300x199.png 300w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-5-1024x681.png 1024w\" sizes=\"(max-width: 250px) 100vw, 250px\" \/><img loading=\"lazy\" class=\"  alignnone wp-image-1663\" src=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-6.png\" alt=\"Canvas 6\" width=\"250\" height=\"166\" srcset=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-6.png 1343w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-6-300x199.png 300w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-6-1024x681.png 1024w\" sizes=\"(max-width: 250px) 100vw, 250px\" \/><\/p>\n<p><!--more--><\/p>\n<p>The following low resolution spectrum of the type A4V star Fomalhaut is taken with the Shelyak Alpy 600. It shows the broad black body profile and prominent hydrogen-Balmer lines typical of an A type star across a visible wavelength range of 3200\u00c5 (click to enlarge).<\/p>\n<div id=\"attachment_1662\" style=\"width: 1353px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-5.png\" target=\"_blank\"><img aria-describedby=\"caption-attachment-1662\" loading=\"lazy\" class=\"wp-image-1662 size-full\" src=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-5.png\" alt=\"Canvas 5\" width=\"1343\" height=\"893\" srcset=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-5.png 1343w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-5-300x199.png 300w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-5-1024x681.png 1024w\" sizes=\"(max-width: 1343px) 100vw, 1343px\" \/><\/a><p id=\"caption-attachment-1662\" class=\"wp-caption-text\">Fomalhaut. R = 526 @ 5852\u00c5<\/p><\/div>\n<p>By comparison, the following spectrum centred on the H-a region is taken with a Shelyak Lhires III. Using the same size CCD Sensor as that of the previous Alpy 600 image, this high resolution instrument shows a narrow range of only 112\u00c5 but in much greater detail &#8211; even at medium resolution. The prominent absorption features are atmospheric telluric lines.<\/p>\n<div id=\"attachment_1663\" style=\"width: 1353px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-6.png\" target=\"_blank\"><img aria-describedby=\"caption-attachment-1663\" loading=\"lazy\" class=\"wp-image-1663 size-full\" src=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-6.png\" alt=\"Canvas 6\" width=\"1343\" height=\"893\" srcset=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-6.png 1343w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-6-300x199.png 300w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-6-1024x681.png 1024w\" sizes=\"(max-width: 1343px) 100vw, 1343px\" \/><\/a><p id=\"caption-attachment-1663\" class=\"wp-caption-text\">Fomalhaut. R = 7254 @ 6532\u00c5<\/p><\/div>\n<p>The following chart shows the relative range difference of both spectra displayed on the scale of the Alpy low resolution spectrum (click to enlarge).<a href=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-3.png\" target=\"_blank\"><img loading=\"lazy\" class=\"alignnone wp-image-1664 size-full\" src=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-3.png\" alt=\"Canvas 3\" width=\"1343\" height=\"893\" srcset=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-3.png 1343w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-3-300x199.png 300w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-3-1024x681.png 1024w\" sizes=\"(max-width: 1343px) 100vw, 1343px\" \/><\/a>Note the lack of detail present in the Alpy spectrum over the range occupied by the Lhires III (click to enlarge).<a href=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-4.png\" target=\"_blank\"><img loading=\"lazy\" class=\"alignnone wp-image-1665 size-full\" src=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-4.png\" alt=\"Canvas 4\" width=\"1343\" height=\"893\" srcset=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-4.png 1343w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-4-300x199.png 300w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2015\/11\/Canvas-4-1024x681.png 1024w\" sizes=\"(max-width: 1343px) 100vw, 1343px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Several spectra of the star Fomalhaut acquired simultaneously with Lhires III and Alpy 600 spectroscopes illustrate the difference between high resolution and low resolution spectroscopy.<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0},"categories":[19],"tags":[],"_links":{"self":[{"href":"http:\/\/jazzistentialism.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1661"}],"collection":[{"href":"http:\/\/jazzistentialism.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/jazzistentialism.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/jazzistentialism.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"http:\/\/jazzistentialism.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1661"}],"version-history":[{"count":13,"href":"http:\/\/jazzistentialism.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1661\/revisions"}],"predecessor-version":[{"id":1680,"href":"http:\/\/jazzistentialism.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1661\/revisions\/1680"}],"wp:attachment":[{"href":"http:\/\/jazzistentialism.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1661"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/jazzistentialism.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1661"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/jazzistentialism.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1661"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}