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α Trianguli Spectrogram, Joel Shepherd

α Trianguli Spectrogram

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α Trianguli Spectrogram, Joel Shepherd

α Trianguli Spectrogram

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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.

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  • 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.

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α Trianguli Spectrogram, Joel Shepherd

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