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The echelle spectrograph of 1.78m telescope in Gaomeigu

The echelle spectrograph of 1.78m telescope in Gaomeigu. Jiang Shi Yang NAOC CAS. The 1.78m Telescope. It is a high angular resolution telescope with adaptive optics so that can keep the image size smaller than 0.1 " It has several coude rooms with focal ratio of 200

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The echelle spectrograph of 1.78m telescope in Gaomeigu

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  1. The echelle spectrograph of 1.78m telescope in Gaomeigu Jiang Shi Yang NAOC CAS

  2. The 1.78m Telescope • It is a high angular resolution telescope with adaptive optics so that can keep the image size smaller than 0.1" • It has several coude rooms with focal ratio of 200 • It is an alta-azimuth type telescope

  3. The old Echelle spectrograph of 216 • 216 Coude F/45, 2.12"/mm • R2 echelle 128mm256mm , beam size 90 mm • Double beam: blue 79l/mm; red 31.6l/mm • Blue  330-580nm, 39-67, total 28 orders • Camera f = 237, 640, 2500mm; • CCD 2p= 48, R=12,000, 44,000, 170,000, • Slit width (SW) =2.66",0.99",0.25" • Cross Dispersion UBK7 prism • Red  520-1100nm; 60-95, total 36 orders • Camera f = 190, 550, 2500mm, CCD 2p= 48 • R=9,620, 37,812, 170,000, ZF3 cross dispersion • SW=3.3",1.15",0.25" • Overall light efficiency 0.02/0.03 for f=(640/550)mm camera. 1k1k CCD partial cover

  4. Old Echelle spectrograph of 2.16330-1100nm, R:10000-100000 图1216 折轴分光仪光路平面图

  5. 216 Coude Echelle spectrograph, Before Slit

  6. SONG echelle spectrograph • Telescope 1m, F/15, 13.75"/mm • R4 beam size 75mm, 31.6l/mm • CCD 2p=0.027mm, R 100,000, SW = 1.3" • Wavelength range 400-680nm, • Prism cross dispersion, • CCD 2k by 2k 13.5, partial cover

  7. Move ESp from 216 to 178 • 1. Change F/200 to F/45, 2.575"/mm • 2. Change dichroic from 550nm to 680nm • 3. Re-coating all the optics • 4. Renew the 2 echelles to 31.6l/mm, • Blue 400-700nm, order 80-140, 61 orders • Camera f=237,640,2500mm, CCD2p=20 • R=39,836, 106,045, 458,114, Ion cell • SW=1.35",0.50", 0.125" , 2k2k 10 CCD • Red 680-1000nm, order 56-83, 28 orders • Camera f=190,550,2500mm, CCD2p=20 • R=31594, 91715, 458114 • SW=1.68",0.58",0.125", 1k4k 10 CCD

  8. In and out • Need 500,000 RMB • Need 2k2k 10 CCD for blue arm & 1k4k 10 CCD for red arm • Blue RV, Red spectra simultaneously • R=100,000, CCD 2p = 20, SW=0.5", if no adaptive optics, slit efficiency only 40% • Real gain to SONG: 1.7820.4=1.3 • With adaptive optics, the gain is 3.17

  9. Only use 1 beam • Take away the dichroic filter • Only use the red arm: 400-1000nm, 56-140, 85 orders, Ion cell • Camera f=190,550,2500mm, CCD2p=18 • Reciprocal Dis. =1.598, 0.552, 0.12nm/mm • R=35,104, 101,895, 509,010 • SW=1.51",0.52", 0.113" • M=56, =18nm, need 11.3/32.5mm CCD to cover the whole range for f=190/550 camer • 2k4k 9 CCD, STL11000MC1, $8795

  10. In & Out • Need 200,000RMB • Need 2k4k 9 CCD, Such as STL-11000M or U16 (a little too large on one way) or MEGAPLUS ES 1100, QE <0.5 • R=100,000, CCD 2p = 18, SW=0.52", if no adaptive optics, slit efficiency only 42% • Real gain to SONG: 1.7820.42=1.33 • With adaptive optics, the gain is 3.17

  11. Main Research fields • 1. Spectroscopic research for bright stars • 2. Stellar Asterosismology • 3. Extra-solar planets • 4. Doppler imaging • 5. Spectral line profile • 6. Chemical contents of stars • 7. Metal poor stars

  12. Thank you

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