Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  The star Albireo (β1Cyg)  ·  The star β2Cyg
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APOD 2022 Feb 24 - Albireo - Spectrum, 



    
        

            Robert Eder
APOD 2022 Feb 24 - Albireo - Spectrum
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APOD 2022 Feb 24 - Albireo - Spectrum

Acquisition type: Lucky imaging
Getting plate-solving status, please wait...
APOD 2022 Feb 24 - Albireo - Spectrum, 



    
        

            Robert Eder
APOD 2022 Feb 24 - Albireo - Spectrum
Powered byPixInsight

APOD 2022 Feb 24 - Albireo - Spectrum

Acquisition type: Lucky imaging

Acquisition details

Dates:
Aug. 14, 2021
Frames:
Integration:
0″
Avg. Moon age:
6.16 days
Avg. Moon phase:
37.11%

Basic astrometry details

Astrometry.net job: 5523350

RA center: 19h31m18s.2

DEC center: +27°5548

Pixel scale: 1.705 arcsec/pixel

Orientation: 130.414 degrees

Field radius: 0.431 degrees

Resolution: 1139x1419

File size: 1.1 MB

Locations: Sofienalpe, Vienna, Austria

Data source: Traveller

Description

Wow!! Two APODs in two weeks! Unbelievable!😲 I think I need to wake up right now!😄
This one took me by surprise, because I didn't even submit it to APOD. I never thought my spectra images could be APOD material. Jerry Bonnell found it on my Astrobin page and asked if he can use it. So cool!

Albireo A (β1 Cygni) is a 3.1 mag giant, has the spectral class K3 II and a temperature of 4270 K. Albireo B (β2 Cygni) has a magnitude of 5.1, the spectral class B8 Ve and a temperature of 13200 K.

In the spectrum profile you can see very nicely that the energy on the hotter Albireo B is concentrated in the blue end of the spectrum and on Albireo A it is shifted far into the red.

With regard to the question of whether Albireo A and B form an optical or physical double star, the data situation shows an inconsistent picture. It was mainly assumed that it is a physical double star, since it is very unlikely that two such bright stars are so close together (0.01°) purely by chance. However, many experts now believe that Albireo is just an optical double star. The radial velocities between the two components are too different.

Anyone can do spectroscopy, I'm still a beginner. It's really easy and inexpensive. All you need is a small telescope, a camera, a Star Analyser grating and the software RSpec. Here's a link with all the info you need. Tom Field (Field Tested Systems) is very helpful and responsive.

Comments

Revisions

  • APOD 2022 Feb 24 - Albireo - Spectrum, 



    
        

            Robert Eder
    Original
  • APOD 2022 Feb 24 - Albireo - Spectrum, 



    
        

            Robert Eder
    B
  • APOD 2022 Feb 24 - Albireo - Spectrum, 



    
        

            Robert Eder
    C
  • Final
    APOD 2022 Feb 24 - Albireo - Spectrum, 



    
        

            Robert Eder
    D

B

Description: Albireo AB Profile

Uploaded: ...

C

Description: Albireo AB Raw Spectrum

Uploaded: ...

D

Description: Wow!! APOD No 7😄

Uploaded: ...

Sky plot

Sky plot

Histogram

APOD 2022 Feb 24 - Albireo - Spectrum, 



    
        

            Robert Eder

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Spectroscopy