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Hubble reflection nebula11/16/2023 ![]() The dumbbell nebular is a nice example of this type. Planetary nebular are formed when an old star throws off its outer layers which is then illuminated by then inner core of the star. The other type of object comes from the other end of stella evolution. Good examples are the Orion and Rosette Nebulae. Most commonly this is found in areas of star birth where hot young stars shine brightly in the UV part of the spectrum and lights up the surrounding gas and dust. In order for us to see an emission object we need a source of high energy light to excite atoms and atoms to be excited. As the energy of the photon determines its wavelength, only certain wavelengths are possible.Ī decay from n3 to n2 results in a photon of 656nm (Hydrogen Alpha)Ī decay from n4 to n2 results in a photon of 486nm (Hydrogen Beta) The energy is released as a photon with a certain energy. As only certain energy levels are possible, the energy released from moving between the orbits is also limited to certain values (quantised). These free or excited electrons will then move back to lower energy orbits and in so doing release the surplus energy they have. If an electron absorbs energy from a high energy photon it can move to a higher energy orbit or be removed from the hydrogen nucleus all together (ionisation). However only certain orbits are allowed, these are termed z=2 (lowest energy), Z=3 (next lowest) etc. Electrons associated with the hydrogen nucleus populate orbits around the nucleus. Hydrogen is by far the most common element in the universe comprising more than 2/3rds of normal matter. ![]() The mechanism here is not thermal but caused by electrons absorbing energy, becoming excited and then releasing that energy. The colour of the object is related to the peak of the emission, which is in turn related to the temperature of the object.Ĭonversely narrow band emission is what make emission nebulae and planetary nebulae glow. ![]() This includes stars, galaxies and reflection nebulae. Light emitting objects come in two types, the most familiar are broad band emitters whose light covers a wide range of wave lengths. It allows us to take images comparable to professional observatories from light polluted suburban locations and offers the opportunity to become creative with our images as processing produces stunning results.īefore we launch into the practicalities let’s take a couple of paragraphs to consider what we will be imaging. Astro Imaging using narrow band filters is a popular and interesting part of our hobby. ![]()
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