Campbell's Hydrogen Star - Spectrum (Robert Eder)

Campbell's Hydrogen Star - Spectrum

Here's a spectrum as a little change from the usual "pretty pictures".🙂

Campbell's Hydrogen Star HD 184738 - BD+30 3639, the star center of the planetary nebula PK 64+5.1, is a very unusual Wolf-Rayet star in the constellation Cygnus. I just wanted to see the massive H-alpha pillar for myself. Every time I see the spectrum of a WR star in the live view of SharpCap I get excited.
The star is surrounded by reddish gas clouds caused by glowing gases including hydrogen and nitrogen. It is known as a WC star, a rare class similar to their much more massive counterparts - WR (Wolf-Rayet) stars.
Wolf-Rayet stars are hot stars, 20 times more massive than the Sun, that quickly blow away material and lose mass. WC stars are something completely different, at the end of their lives, they are sun-like stars with low mass. While these stars have recently expelled much of their original mass, the hot stellar core is still losing mass at a high rate, creating a hot wind. It is these winds that cause them to resemble Wolf-Rayet stars. However, astronomers can look more closely at the composition of these winds to distinguish stars from one another. WC stars can be identified by the carbon and oxygen in their winds, which is also clearly visible in this spectrum. Some true Wolf-Rayet stars are instead rich in nitrogen, but this is very rare for their low-mass counterparts.
HD 184738 is also surrounded by dust that is very similar to the material from which Earth formed. The origin of this dust is uncertain.

The ASI533MC-Pro is ideal for spectroscopy. With the larger sensor I can also use the larger telescope, increasing the distance to the Star Analyser and thereby doubling the resolution. In addition, it does not have a built-in UV/IR cut filter.

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