{"id":1137,"date":"2014-06-05T19:51:43","date_gmt":"2014-06-06T03:51:43","guid":{"rendered":"http:\/\/jazzistentialism.com\/blog\/?p=1137"},"modified":"2015-02-11T23:40:19","modified_gmt":"2015-02-12T07:40:19","slug":"star-spectra-test","status":"publish","type":"post","link":"http:\/\/jazzistentialism.com\/blog\/?p=1137","title":{"rendered":"Star Spectra Test"},"content":{"rendered":"<p><span style=\"color: #333333;\">&#8216;First light&#8217; star testing of a\u00a0<\/span><a href=\"http:\/\/jazzistentialism.com\/blog\/?attachment_id=1195\">Spectra L200 spectroscope<\/a><span style=\"color: #333333;\">\u00a0. Click \u201cContinue reading\u201d below to see the entire analysis.<\/span><\/p>\n<p><img loading=\"lazy\" class=\"alignleft wp-image-1139 size-full\" src=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig3.jpg\" alt=\"StarSpectraFig3\" width=\"1000\" height=\"100\" srcset=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig3.jpg 1000w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig3-300x30.jpg 300w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p><!--more--><\/p>\n<p>A sequence of 12 x 300s sub exposures of star HIP 42913 (SAO 236232), a bright type A1V star in the constellation of Vela was\u00a0acquired with the Spectra L200, using a slit width of approximately 35 microns (as indicated on the spectroscope dial). Spectral range was centered around 6100 \u00c5 &#8211; a comparatively &#8216;uninteresting&#8217; region of A-type stars (see gamma Centauri at the end of this post).<\/p>\n<h3>Equipment<\/h3>\n<p style=\"color: #333333;\">Telescope: DSI RC14C (0.35m, f\/7 Ritchey\u2013Chr\u00e9tien)<br \/>\nImaging Camera: Atik314L+ (1392\u00d71040, 0.65\u00b5m)<br \/>\nSpectroscope: Spectra L200 with 600 l\/mm diffraction grating<\/p>\n<p>Additional notes:<\/p>\n<ul>\n<li>The altitude of the star was comparatively low (+38 degrees and setting in the south west circumpolar sky).<\/li>\n<li>Images were bias and dark adjusted (a fresh master dark frame from 12 x 300s darks).<\/li>\n<li>CCD temperature was -10 degrees C.<\/li>\n<li>The profile has not been corrected for instrument response.<\/li>\n<\/ul>\n<h3>Analysis<\/h3>\n<p>The target sub frames were combined in MaxIM DL using a sum function and no alignment. Images were guided throughout the sequence.<\/p>\n<p>Neon calibration images were taken before and after the sequence. The final neon image was used for calibration (for no particular reason).<\/p>\n<p>Images were loaded into BASS for analysis.<\/p>\n<p>A simultaneous correction for slant was applied to both the neon and target spectra. (No tilt is evident in the raw images.)<\/p>\n<p>Active binning regions were selected individually for both the neon and target images. Subtraction regions above and below the spectrum were applied to the target image.<\/p>\n<p>A calibration of the neon image using 9 points and a 5<sup>th<\/sup> order polynomial yielded an RMS of 0.007:<br \/>\n<a href=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig1.jpg\"><img loading=\"lazy\" class=\"alignleft size-full wp-image-1129\" src=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig1.jpg\" alt=\"StarSpectraFig1\" width=\"1100\" height=\"500\" srcset=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig1.jpg 1100w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig1-300x136.jpg 300w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig1-1024x465.jpg 1024w\" sizes=\"(max-width: 1100px) 100vw, 1100px\" \/><\/a><\/p>\n<p>Measurement of a number of additional neon lines yielded very good correlation between measured and published values. For example, using the BASS measurement tool at neon 6143.06 \u00c5:<\/p>\n<p>Selected Start : 6139.3\u00c5 (411.05 px)<br \/>\nSelected End\u00a0\u00a0 : 6146.8\u00c5 (417.91 px)<br \/>\nSelected Width : 7.5\u00c5 (6.86 px)<br \/>\nMax Flux\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 : 23434.47 at 6143.05\u00c5 (414.5 px)<br \/>\nMin Flux\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 : 223.88 at 6139.43\u00c5 (411.15 px)<br \/>\nFlux Range\u00a0\u00a0\u00a0\u00a0 : 23210.59<br \/>\nAverage Flux\u00a0\u00a0 : 6780.81 (RMS 10715.97)<\/p>\n<p>FWHM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 : 2.32 \u00c5 (R = 2643 @6143.05\u00c5)<\/p>\n<p>The calibrated star profile appears as follows (click to enlarge):<br \/>\n<a href=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig2.jpg\"><img loading=\"lazy\" class=\"alignleft size-full wp-image-1130\" src=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig2.jpg\" alt=\"StarSpectraFig2\" width=\"1100\" height=\"500\" srcset=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig2.jpg 1100w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig2-300x136.jpg 300w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig2-1024x465.jpg 1024w\" sizes=\"(max-width: 1100px) 100vw, 1100px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig3.jpg\"><img loading=\"lazy\" class=\"aligncenter wp-image-1139\" src=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig3.jpg\" alt=\"StarSpectraFig3\" width=\"585\" height=\"64\" \/><\/a><\/p>\n<p>The profile with a number of spectral features identified\u00a0using the BASS measurement tool:<br \/>\n<a href=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig4.jpg\"><img loading=\"lazy\" class=\"alignleft size-full wp-image-1132\" src=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig4.jpg\" alt=\"StarSpectraFig4\" width=\"1100\" height=\"500\" srcset=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig4.jpg 1100w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig4-300x136.jpg 300w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig4-1024x465.jpg 1024w\" sizes=\"(max-width: 1100px) 100vw, 1100px\" \/><\/a><\/p>\n<p>A cropped version centred on\u00a0the sodium doublet region:<br \/>\n<a href=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig5.jpg\"><img loading=\"lazy\" class=\"alignleft size-full wp-image-1133\" src=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig5.jpg\" alt=\"StarSpectraFig5\" width=\"1100\" height=\"500\" srcset=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig5.jpg 1100w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig5-300x136.jpg 300w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig5-1024x465.jpg 1024w\" sizes=\"(max-width: 1100px) 100vw, 1100px\" \/><\/a><\/p>\n<h3><\/h3>\n<h3><\/h3>\n<h3><\/h3>\n<h3>Additional charts:<\/h3>\n<ol>\n<li>A single 300s exposure (note the poor SNR evident in a single 300s image):<br \/>\n<a href=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig6.jpg\"><img loading=\"lazy\" class=\"alignleft size-full wp-image-1134\" src=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig6.jpg\" alt=\"StarSpectraFig6\" width=\"1100\" height=\"500\" srcset=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig6.jpg 1100w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig6-300x136.jpg 300w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig6-1024x465.jpg 1024w\" sizes=\"(max-width: 1100px) 100vw, 1100px\" \/><\/a><\/li>\n<\/ol>\n<p>2.\u00a0A chart displaying all\u00a012 profiles. Some drift is evident:<br \/>\n<a href=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig7.jpg\"><img loading=\"lazy\" class=\"alignleft size-full wp-image-1135\" src=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig7.jpg\" alt=\"StarSpectraFig7\" width=\"1100\" height=\"500\" srcset=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig7.jpg 1100w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig7-300x136.jpg 300w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig7-1024x465.jpg 1024w\" sizes=\"(max-width: 1100px) 100vw, 1100px\" \/><\/a><br \/>\n<a href=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig8.jpg\"><img loading=\"lazy\" class=\"aligncenter wp-image-1136\" src=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/StarSpectraFig8.jpg\" alt=\"StarSpectraFig8\" width=\"582\" height=\"188\" \/><\/a><\/p>\n<h3><\/h3>\n<h3>Update September 1st, 2014<\/h3>\n<p>Gamma Centauri &#8211; reference spectra taken at more &#8220;useful&#8221; target wavelengths as part of the 2014 eta Carinae periastron campaign, showing the strong Hydrogen absorption lines typical of A-type stars. These profiles were created using ISIS.<\/p>\n<p><a href=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/gamcentha.jpg\"><img loading=\"lazy\" class=\"alignleft size-full wp-image-1373\" src=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/gamcentha.jpg\" alt=\"gamcentha\" width=\"853\" height=\"517\" srcset=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/gamcentha.jpg 853w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/gamcentha-300x181.jpg 300w\" sizes=\"(max-width: 853px) 100vw, 853px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/gamcentheii.jpg\"><img loading=\"lazy\" class=\"alignleft size-full wp-image-1372\" src=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/gamcentheii.jpg\" alt=\"gamcentheii\" width=\"860\" height=\"516\" srcset=\"http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/gamcentheii.jpg 860w, http:\/\/jazzistentialism.com\/blog\/wp-content\/uploads\/2014\/06\/gamcentheii-300x180.jpg 300w\" sizes=\"(max-width: 860px) 100vw, 860px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#8216;First light&#8217; star testing of a\u00a0Spectra L200 spectroscope\u00a0. Click \u201cContinue reading\u201d below to see the entire analysis.<\/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\/1137"}],"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=1137"}],"version-history":[{"count":21,"href":"http:\/\/jazzistentialism.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1137\/revisions"}],"predecessor-version":[{"id":1553,"href":"http:\/\/jazzistentialism.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1137\/revisions\/1553"}],"wp:attachment":[{"href":"http:\/\/jazzistentialism.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1137"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/jazzistentialism.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1137"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/jazzistentialism.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1137"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}