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The letter "M" in this designation means that it is a red star belonging to the M spectral class and therefore has a relatively low photospheric temperature; the "Ia-ab" suffix luminosity class indicates that it is an intermediate-luminosity supergiant, with properties partway between a normal supergiant and a luminous supergiant. Since 1943 ...
The Red Rectangle Nebula, so called because of its red color and unique rectangular shape, is a protoplanetary nebula in the Monoceros constellation.Also known as HD 44179, the nebula was discovered in 1973 during a rocket flight associated with the AFCRL Infrared Sky Survey called Hi Star.
Hubble Space Telescope image of the nebula M1-67 and the Wolf–Rayet star WR 124 in the center. Once included as type O stars, the Wolf–Rayet stars of class W [89] or WR are notable for spectra lacking hydrogen lines. Instead their spectra are dominated by broad emission lines of highly ionized helium, nitrogen, carbon, and sometimes oxygen.
NGC 6326, a planetary nebula with glowing wisps of outpouring gas that are lit up by a binary [3] central star. A planetary nebula is a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives. [4] The term "planetary nebula" is a misnomer because they are unrelated to ...
Examples of star-forming regions are the Orion Nebula, the Rosette Nebula and the Omega Nebula. Feedback from star-formation, in the form of supernova explosions of massive stars, stellar winds or ultraviolet radiation from massive stars, or outflows from low-mass stars may disrupt the cloud, destroying the nebula after several million years.
Although the title of Neil Cross’ new four-part series is “The Sister,” the story actually follows a man named Nathan (Russell Tovey). The audience first meets him when he is completely ...
A bipolar nebula is a type of nebula characterized by two lobes either side of a central star. ... The Red Rectangle Nebula [24] [25] [26]
It has been described as a red star since at least the 1840s, [a] when Friedrich Wilhelm Argelander noted it as "very red" in his catalog. [20] RW Cephei was independently discovered to be variable by Thomas William Backhouse and Henrietta Swan Leavitt in 1899 and 1907 respectively, [ 21 ] [ 22 ] but has been suspected to be variable by Angelo ...