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List Of Stars In Columba ...
This is the list of notable stars in the constellation Columba, sorted by decreasing brightness. Notes See also * List of stars by constellation References * * * * * * * * {{Stars of Columba *List Columba Columba or Colmcille; gd, Calum Cille; gv, Colum Keeilley; non, Kolban or at least partly reinterpreted as (7 December 521 – 9 June 597 AD) was an Irish abbot and missionary evangelist credited with spreading Christianity in what is toda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Star
A star is an astronomical object comprising a luminous spheroid of plasma held together by its gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night, but their immense distances from Earth make them appear as fixed points of light. The most prominent stars have been categorised into constellations and asterisms, and many of the brightest stars have proper names. Astronomers have assembled star catalogues that identify the known stars and provide standardized stellar designations. The observable universe contains an estimated to stars. Only about 4,000 of these stars are visible to the naked eye, all within the Milky Way galaxy. A star's life begins with the gravitational collapse of a gaseous nebula of material composed primarily of hydrogen, along with helium and trace amounts of heavier elements. Its total mass is the main factor determining its evolution and eventual fate. A star shines for most of its active life due t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gamma Cassiopeiae Variable
A Gamma Cassiopeiae variable (γ Cassiopeiae variable) is a type of variable star, named for its prototype γ Cassiopeiae. Variability γ Cassiopeiae variables show irregular changes in brightness on a timescale of decades. These typically have amplitudes of the order of a magnitude. For example, γ Cassiopeiae is usually about magnitude 2.5 and has varied between magnitudes 1.6 and 3.0. The variations are associated with changes in the spectrum between normal absorption spectra and Be star spectra, often also including shell star characteristics. Pleione and γ Cassiopeiae itself are both variable stars that have intermittent shell episodes where strong shell features appear in the spectrum and the brightness increases or decreases significantly. At other times the shell is not detectable in the spectrum, and even the emission lines may disappear. The General Catalogue of Variable Stars (GCVS) categorises γ Cassiopeiae stars as eruptive variables and describes them as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mu Columbae
Mu Columbae (μ Col, μ Columbae) is a star in the constellation of Columba. It is one of the few O-class stars that are visible to the unaided eye. The star is known to lie approximately 1,300 light years from the Solar System (with an error margin of a few hundred light years). This is a relatively fast rotating star that completes a full revolution approximately every 1.5 days. (Compare this to the Sun, which at only 22 percent of this star's diameter rotates only once every 25.4 days.) This rate of rotation is fairly typical for stars of this class. Based on measurements of proper motion and radial velocity, astronomers know that this star and AE Aurigae are moving away from each other at a relative velocity of over 200 km/s. Their common point of origin intersects with Iota Orionis in the Trapezium cluster, some two and half million years in the past. The most likely scenario that could have created these runaway stars is a collision between two binary star s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theta Columbae
Theta Columbae, also named Elkurud , is a solitary star in the southern constellation of Columba. It is faintly visible to the naked eye, having an apparent visual magnitude of 5.02. Based upon parallax measurements taken during the Hipparcos mission, it is roughly distant from the Sun. At its present distance, the visual magnitude of the star is reduced by an interstellar extinction factor of 0.11. It is currently moving away from the Sun with a radial velocity of 45.3 km/s. The star made its closest approach about 4.7 million years ago when it underwent perihelion passage at a distance of . This is an evolving B-type subgiant star with a stellar classification of B8 IV, having recently left the main sequence. It is spinning rapidly with a projected rotational velocity of 249 km/s. The star has an estimated four times the mass of the Sun. It radiates 472 times the solar luminosity from its outer atmosphere at an effective temperature of 9,916 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xi Columbae
Xi Columbae is a binary star system in the southern constellation of Columba. With an apparent visual magnitude of 4.97, it is faintly visible to the naked eye. Based upon an annual parallax shift of , it is located around 323 light years from the Sun. The system is a member of the HR 1614 supergroup, and is drifting further away with a radial velocity of +59.5 km/s, This is an astrometric binary with an orbital period of 1,420.6 days and an eccentricity of 0.39. The primary is an evolved K-type giant star with a stellar classification of , showing an overabundance of CN in its spectrum. The star has expanded to 16 times the radius of the Sun and is radiating 120 times the Sun's luminosity from its swollen photosphere at an effective temperature The effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amount of electromagnetic radiation. Effective temperature is often used a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rotating Ellipsoidal Variable
Rotating ellipsoidal variables are a class of variable star. They are close binary systems whose components are ellipsoidal. They are not eclipsing, but fluctuations in apparent magnitude occur due to changes in the amount of light emitting area visible to the observer. Typical brightness fluctuations do not exceed 0.1 magnitudes. The brightest rotating ellipsoidal variable is Spica Spica is the brightest object in the constellation of Virgo and one of the 20 brightest stars in the night sky. It has the Bayer designation α Virginis, which is Latinised to Alpha Virginis and abbreviated Alpha Vir or α Vir. Anal ... (α Virginis). References * Morris, S.L. "The Ellipsoidal Variable Stars", ApJ 295: 143–152, 1985 August 1 * Samus N.N., Durlevich O.V., et al. ''Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.)'' * Variable stars * {{var-star-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lambda Columbae
Lambda Columbae, Latinized from λ Columbae, is a probable binary star in the southern constellation of Columba. With an apparent visual magnitude of 4.86, it is faintly visible to the naked eye. The measured annual parallax shift of 9.75 mas yields an estimated distance of roughly 335 light years. Lambda Columbae has a stellar classification of B5 V, indicating that it is a B-type main sequence star. It is a suspected rotating ellipsoidal variable with a period of 0.64 days and an amplitude of 0.07 magnitude. Confirmation would indicate that this is a close binary system. It has an estimated age of around 57 million years. In Chinese, (), meaning ''Son A son is a male offspring; a boy or a man in relation to his parents. The female counterpart is a daughter. From a biological perspective, a son constitutes a first degree relative. Social issues In pre-industrial societies and some current c ...'', refers to an asterism consisting o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Omicron Columbae
Omicron Columbae is a star in the southern constellation Columba. It has an apparent visual magnitude of 4.81, which is bright enough to be faintly visible to the naked eye. The distance to this star, as determined by an annual parallax shift of 30.82 mas, is 105.8 light years. The visual magnitude is reduced by an interstellar absorption factor of 0.06 due to intervening dust. Depending on the source, this star has been given a stellar classification of K1 III or K1 IV, suggesting that it is a K-type star currently in the subgiant or giant stage of its evolution. It has 1.57 times the Sun's mass and has expanded to more than five times the radius of the Sun. The star appears to be spinning slowly with a projected rotational velocity of 1.2 km/s, and is around 2.2 billion years old. It is estimated to radiate 15.5 times the solar luminosity from its outer atmosphere at an effective temperature of 4,936 K. Omicron Columbae is a high ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kappa Columbae
Kappa Columbae, Latinized from κ Columbae, is a solitary star in the southern constellation of Columba. It has an apparent visual magnitude of 4.37, which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 17.87 mas, it is located at a distance of 183 light years from the Sun. It has a peculiar velocity of , making it a candidate runaway star. This is an evolved K-type giant star with a stellar classification of K0.5 IIIa. The measured angular diameter of this star, after correction for limb darkening, is . At the estimated distance of this star, this yields a physical size of about 10.5 times the radius of the Sun. It has an estimated 1.76 times the mass of the Sun and is about 1.7 billion years old. The star radiates 57.5 times the solar luminosity from its outer atmosphere at an effective temperature of 4,876 K. It is catalogued as a suspected variable star. In Chinese, (), meaning ''Grandson Family ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Variable Star
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) changes with time. This variation may be caused by a change in emitted light or by something partly blocking the light, so variable stars are classified as either: * Intrinsic variables, whose luminosity actually changes; for example, because the star periodically swells and shrinks. * Extrinsic variables, whose apparent changes in brightness are due to changes in the amount of their light that can reach Earth; for example, because the star has an orbiting companion that sometimes eclipses it. Many, possibly most, stars have at least some variation in luminosity: the energy output of the Sun, for example, varies by about 0.1% over an 11-year solar cycle. Discovery An ancient Egyptian calendar of lucky and unlucky days composed some 3,200 years ago may be the oldest preserved historical document of the discovery of a variable star, the eclipsing binary Algol. Of the modern astronomers, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gamma Columbae
Gamma Columbae, Latinized from γ Columbae, is a possible wide binary star system in the southern constellation of Columba. It is visible to the naked eye with an apparent visual magnitude of 4.36. Based upon an annual parallax shift of 3.75 mas, it is located roughly 870 light years from the Sun. The primary component is an evolved B-type subgiant star with a stellar classification of B2.5 IV. It is a candidate slowly pulsating B-type star with a mean longitudinal magnetic field strength of . The star has nearly six times the mass of the Sun and close to five times the Sun's girth. It is radiating over 2,000 times the solar luminosity from its outer atmosphere at an effective temperature of 12,904 K. The estimated age of this star is around 24 million years. At this age, it is thought to be the remnant of a once more massive star that just finished hydrogen fusion, and is undergoing structural readjustment. This process is extremely short, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eta Columbae
Eta Columbae is a solitary star near the southern boundary of the constellation Columba. It is visible to the naked eye, having an apparent visual magnitude of 3.96. Based upon an annual parallax shift of 6.91 mas, it lies at a distance of roughly 472 light years from the Sun. This is an orange-hued K-type giant star with a stellar classification of K0 III, or possibly a bright giant with a crossover class of G8/K1 II. The measured angular diameter of this star, after correction for limb darkening, is . At the estimated distance of this star, this yields a physical size of about 38.6 times the radius of the Sun. It has an estimated 3.33 times the mass of the Sun and radiates 708 times the solar luminosity from its outer atmosphere at an effective temperature of 4,620 K. References {{DEFAULTSORT:Eta Columbae K-type giants Columba (constellation) Columbae, Epsilon Durchmusterung objects 040808 028328 02120 1 (one, unit, unity) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
