Getting plate-solving status, please wait...
β Pegasi (Scheat) Spectrogram, 



    
        

            Joel Shepherd

β Pegasi (Scheat) Spectrogram

Getting plate-solving status, please wait...
β Pegasi (Scheat) Spectrogram, 



    
        

            Joel Shepherd

β Pegasi (Scheat) 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. 6, 2020

Frames: 12x1" (12")

Integration: 12"

Avg. Moon age: 18.89 days

Avg. Moon phase: 81.95%


Basic astrometry details

Astrometry.net job: 3964735


Resolution: 1386x714

Locations: Home, Seattle, WA, United States

Data source: Backyard

Description

β Pegasi, commonly known as Scheat, is an M-class star in Pegasus, with the deep and broad titanium monoxide (TiO) absorption lines common to that class.

I learned a couple new things while working on this star. One is that M-class stars are believed to be amongst the commonest and longest-lived stars out there, several hundred billion years for an M2-3 class star like this one! Yes: far longer than the current age of the universe.

Second, according to http://spiff.rit.edu/classes/phys230/lectures/spec_interp/spec_interp.html, is that a star's surface temperature can be estimated as 29,000,000° K / (peak wavelength in Å). From my data, that gives β Pegasi's surface temperature as 29,000,000 / 7560.7 = 3,836° K, which is 147° K off the generally accepted value of 3689° K. Isn't that crazy? Less than 5% error (so far as we know) measuring the temperature of something 192 light-years away.

Comments

Revisions

  • β Pegasi (Scheat) Spectrogram, 



    
        

            Joel Shepherd
    Original
  • β Pegasi (Scheat) Spectrogram, 



    
        

            Joel Shepherd
    B
  • β Pegasi (Scheat) Spectrogram, 



    
        

            Joel Shepherd
    C
  • Final
    β Pegasi (Scheat) Spectrogram, 



    
        

            Joel Shepherd
    D

C

Description: Reprocessed with a corrected instrument response curve.

Uploaded: ...

D

Description: Recalibrated and processed with updated instrument response curve.

Uploaded: ...

Histogram

β Pegasi (Scheat) Spectrogram, 



    
        

            Joel Shepherd

In these public groups

Spectroscopy