expanding emission nebula Comparison Table

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expanding emission nebula comparison table

Subject has ejection velocity has expansion velocity use to measure distance is a kind of has catalog has wavelength has acronym produce has mass has definition has lifetime

nova remnant typically 1000 km/s expanding emission nebula gaseous nebula catalog much lower than planetary nebula an expanding emission nebula produced by a nova a few centuries

planetary nebula typically 10 km/s expanding emission nebula planetary nebula catalog An expanding envelope of rarefied ionized gas surrounding a hot white dwarf. The envelope receives ultraviolet radiation from the central star and reemits it as visible light by the process of fluorescence. The planetary nebula stage lasts for less than 50,000 years. During the core contraction that terminates the red-giant stage, the helium-burning shell is ejected at a velocity so high that it becomes separated from the core. Under current theories, a star with a carbon core and a mass greater than 0.6 M_sun (but less than 4 M_sun) will become a planetary nebula and leave behind a white dwarf. Planetary nebulae are now known to occur in stars less than 4 M_sun whose envelope becomes unstable during the hydrogen shell burning stage.

supernova remnant 10000 km s^-1 radio source radio source catalog radio SNR synchrotron radiation A gaseous nebula, the expanding shell ejected by a supernova, and deriving its energy (at least in some cases) from the conversion by the remanent neutron star of its rotational energy into a stream of high-energy particles being continually accelerated in the SNR. About 100 SNRs are known in our Galaxy. Supernova remnants are usually powerful radio sources.

Subject	has ejection velocity	has expansion velocity	use to measure distance	is a kind of	has catalog	has wavelength	has acronym	produce	has mass	has definition	has lifetime
nova remnant		typically 1000 km/s		expanding emission nebula	gaseous nebula catalog				much lower than planetary nebula	an expanding emission nebula produced by a nova	a few centuries
planetary nebula		typically 10 km/s		expanding emission nebula	planetary nebula catalog					An expanding envelope of rarefied ionized gas surrounding a hot white dwarf. The envelope receives ultraviolet radiation from the central star and reemits it as visible light by the process of fluorescence. The planetary nebula stage lasts for less than 50,000 years. During the core contraction that terminates the red-giant stage, the helium-burning shell is ejected at a velocity so high that it becomes separated from the core. Under current theories, a star with a carbon core and a mass greater than 0.6 M_sun (but less than 4 M_sun) will become a planetary nebula and leave behind a white dwarf. Planetary nebulae are now known to occur in stars less than 4 M_sun whose envelope becomes unstable during the hydrogen shell burning stage.
supernova remnant	10000 km s^-1			radio source	radio source catalog	radio	SNR	synchrotron radiation		A gaseous nebula, the expanding shell ejected by a supernova, and deriving its energy (at least in some cases) from the conversion by the remanent neutron star of its rotational energy into a stream of high-energy particles being continually accelerated in the SNR. About 100 SNRs are known in our Galaxy. Supernova remnants are usually powerful radio sources.

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