EpsilonEpsilon AurigaeAurigae

College of San Mateo College of San Mateo Science Center & Science Center & PlanetariumPlanetarium

College of San Mateo College of San Mateo Science Center & Science Center & PlanetariumPlanetarium

Lunar eclipse 10-27-07

ImaginImaging:g:

Deep skyDeep skyPlanetaryPlanetaryPhotometryPhotometrySpectroscopSpectroscopyyVideoVideo

ImaginImaging:g:

Deep skyDeep skyPlanetaryPlanetaryPhotometryPhotometrySpectroscopSpectroscopyyVideoVideo

Equipment:Equipment:Losmandy G-11Losmandy G-11-excellent tracking.-excellent tracking.8”SCT @f/6.38”SCT @f/6.3 -good signal-good signal -5 min. -5 min. exp.exp.ST7-XME CCDST7-XME CCD -SGS matched, guide -SGS matched, guide chip.chip. SBIG-SGS SBIG-SGS -1.06 A/pix x765. --1.06 A/pix x765. -Oriented E/WOriented E/W

Software:Software:TheSky 6TheSky 6 -accurate mount control-accurate mount controlCCDSoftCCDSoft -image acquisition-image acquisitionMaxim DLMaxim DL -image reduction (darks)-image reduction (darks)Iris, Vspec, IRAFIris, Vspec, IRAF -spectra processing-spectra processing

Calibration Calibration spectra:spectra: Blue=Blue=mercury 4358, px. 236mercury 4358, px. 236 Red=Red=neon 6402, px. 332neon 6402, px. 332 ((SGS SGS micrometer)micrometer) Exp.=Exp.=Merc=180s Merc=180s Neon=90s(autodarks)Neon=90s(autodarks)

Imaging:Imaging:2 Stars: 2 Stars: eps Aur & eps Aur & HR1544HR1544

ConnectConnectST7ST7SyncSyncSky6Sky6FocusFocusmanualmanualCalibrateCalibrateguiderguiderTestTestexposureexposure

Imaging:Imaging:1st calibration spectra:1st calibration spectra: red or red or blue.blue. Image 1st star:Image 1st star: eps Aur or 1544, eps Aur or 1544, 5 min. 5 min. Slew/image 2nd star:Slew/image 2nd star: same same wavelength.wavelength.2nd cal. spectra:2nd cal. spectra: re-image both re-image both stars.stars.All images: All images: x2x2 Dark frames: Dark frames: x10x10

Processing: Processing: IRAFIRAF

Starting point for analysis: Raw eps Aur / red. Intensity level vs. pixel

number.

Raw HR1544 / red. Standard star, used to

flux calibrate eps Aur. -Taken the same night.

Processing: Processing: IRAFIRAF

Processing: Processing: IRAFIRAF

Flux calibrated epsilon Aurigae in red.Intensity vs. wavelength.

Magnified view of the hydrogen alpha line of Almaaz. March 30,

2009

““Epsilon Aurigae - A Spectral Epsilon Aurigae - A Spectral Investigation.”Investigation.”

Summer 2009 Citizen Sky WorkshopSummer 2009 Citizen Sky Workshop