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DD Microscopii, also known as CD−43°14304, … DD Microscopii, also known as CD−43°14304, is a binary star system in the constellation Microscopium. The system has a combined average apparent magnitude around 11, making it readily visible in telescopes but not to the naked eye. It is thought to be at a distance of one or two thousand parsecs, although parallax measurements place the system at a distance of around 30,000 light years. It is a symbiotic star system composed of an orange giant with a class of either K2 III or K5/M0 IIIe. Both stellar classifications of the primary indicate a red giant, but one has a regular spectrum while the other shows an evolved star with the characteristics of a K5 and M0 giant star plus emission lines in its spectrum. The secondary is a white dwarf in close orbit, ionizing the stellar wind of the larger star. The giant star and white dwarf both take about 4 years to orbit each other. The primary has an enlarged radius of 103 R☉ and an effective temperature of 3,941 K, giving a red hue when viewed through a telescope. DD Microscopii is extremely metal deficient, with an iron abundance only 12% of the Sun, and spins leisurely with a projected rotational velocity lower than 3 km/s. The star system has its origin in the galactic halo of the Milky Way as indicated by the high galactic latitude. DD Microscopii is cataloged as a Z Andromedae variable, a type of symbiotic binary with occasional outbursts. It fluctuates between magnitudes 11.0 and 11.7 over a span of almost 400 days.0 and 11.7 over a span of almost 400 days.
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46220269
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10876
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1124528575
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11
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+1.57
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K2 III or K5/M0 IIIe
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yellow giant
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http://dbpedia.org/resource/Microscopium +
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1
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0.22
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J2000.0
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0.25
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4.6
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1.45
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−0.93
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White dwarf
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0.0205
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0.1072
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261
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2445560
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yellow giant
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−2.035
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−10.080
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103
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<3
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3941
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+0.37
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http://dbpedia.org/resource/Z_Andromedae_variable +
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| rdfs:comment |
DD Microscopii, also known as CD−43°14304, … DD Microscopii, also known as CD−43°14304, is a binary star system in the constellation Microscopium. The system has a combined average apparent magnitude around 11, making it readily visible in telescopes but not to the naked eye. It is thought to be at a distance of one or two thousand parsecs, although parallax measurements place the system at a distance of around 30,000 light years.t a distance of around 30,000 light years.
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| rdfs:label |
DD Microscopii
|
