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α Trianguli Spectrogram, 



    
        

            Joel Shepherd

α Trianguli Spectrogram

Getting plate-solving status, please wait...
α Trianguli Spectrogram, 



    
        

            Joel Shepherd

α Trianguli Spectrogram

Imaging telescopes or lenses: TEC 140 APO FL

Imaging cameras: Atik 460EX Mono

Mounts: Astro-Physics Mach1GTO

Guiding cameras: Lodestar X2

Focal reducers: TEC FRC (.9 reducer + FF)

Software: Field Tested Systems RSpec  ·  Sequence Generator Pro

Filters: Paton Hawksley Education Ltd Star Analyser 200

Accessory: QHYCCD OFF AXIS GUIDER


Dates:Oct. 5, 2020

Frames: 12x4" (48")

Integration: 48"

Avg. Moon age: 17.99 days

Avg. Moon phase: 88.66%


Basic astrometry details

Astrometry.net job: 3944077


Resolution: 1386x714

Locations: Home, Seattle, WA, United States

Data source: Backyard

Description

α Trianguli is a magnitude 3.42 F-class star, approximately 63 light-years distant.

F-class stars are distinguished from the hotter stars farther down the main sequence (O, B and A-class stars) by their diminished hydrogen Balmer lines (compare to Vega, an A-class star, for example: https://www.astrobin.com/qdxilo/?nc=user ), and a distinctive band near the hydrogen-gamma line, around 4300Å.

My estimate of the star's temperature, based on the peak intensity of the spectrum (around 4158Å), is 6968K, which is a good 10% off the generally accepted value of 6288K.

On the cooler, red end of the spectrum, the big dip around 7300Å is due to atmospheric absorption.

I continue to think there is something going on with my focus, instrument response estimation, or some other factor that I don't understand yet, causing the big waves on the right, and the relatively small dips in the absorption lines compared to reference spectrum. Oh well. I'll keep working at it.

Comments

Revisions

  • α Trianguli Spectrogram, 



    
        

            Joel Shepherd
    Original
  • Final
    α Trianguli Spectrogram, 



    
        

            Joel Shepherd
    B

B

Description: While trying to understand the wavy regions in the red end of my spectrum (which I now believe are primarily telluric in origin: absorption by H2O and O2 in the earth's atmosphere), I discovered that I'd misidentified the spectral class of the star (α Pegasi: Markab) that I used to generate my instrument response (IR) curve. This is the same data normalized with a better instrument response curve, making for a better match to an F5 III reference curve and taming the telluric waves somewhat.

Uploaded: ...

Histogram

α Trianguli Spectrogram, 



    
        

            Joel Shepherd

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Spectroscopy