Английская Википедия:Alpha Circini
Шаблон:Short description Шаблон:Starbox begin Шаблон:Starbox image Шаблон:Starbox observe Шаблон:Starbox character Шаблон:Starbox astrometry Шаблон:Starbox detail Шаблон:Starbox catalog Шаблон:Starbox reference Шаблон:Starbox end
Alpha Circini (α Cir, α Circini) is a variable star in the faint, southern, circumpolar constellation of Circinus. At an apparent visual magnitude of 3.19,[1] it is the brightest star in the constellation and can be readily seen with the naked eye from the southern hemisphere to as far north as 25° north latitude. Parallax measurements of this star yield an estimated distance of Шаблон:Convert from the Earth.[2]
This star belongs to a class of variables known as rapidly oscillating Ap stars. It oscillates with multiple, non-radial pulsation cycles and a dominant cycle of 6.8 minutes.[3] The spectrum shows peculiar features caused by chemical stratification of the outer atmosphere. It displays a moderate deficiency of carbon, nitrogen and oxygen, while there is an overabundance of chromium (Cr).[4] The stellar classification of A7 Vp SrCrEu[5] indicates that this is a main sequence star with enhanced levels of strontium (Sr), chromium, and europium (Eu) in its atmosphere (compared to a typical star like the Sun).[6]
The mass of Alpha Circini is about 150% to 170% the mass of the Sun[4] and it has double the Sun's radius,[7] while the luminosity is more than 10 times that of the Sun. The effective temperature of the outer envelope is about 7,500 K, giving it the white hue typical of A-type stars.[4][8] It is rotating with a period of 4.5 days and the pole is inclined by about Шаблон:Nowrap to the line of sight from the Earth.[3]
Based upon its location and motion through space, Alpha Circini is a candidate member of a stellar kinematic group known as the Beta Pictoris moving group. This group shares a common origin and has an estimated age of about 12 million years. At the birth of this group, Alpha Circini was estimated to be located at a distance of about Шаблон:Convert from the center of the assemblage.[9]
References
Шаблон:Stars of Circinus Шаблон:Authority control
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- Английская Википедия
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- Circinus
- A-type main-sequence stars
- Suspected variables
- Bayer objects
- Durchmusterung objects
- Henry Draper Catalogue objects
- Hipparcos objects
- Bright Star Catalogue objects
- Gould objects
- Rapidly oscillating Ap stars
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- Википедия
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