"사용자:Ta183ta/연습장"의 두 판 사이의 차이

잔글
The secondary, now more massive star is surrounded by an [[accretion disk]] from this mass transfer, with [[bipolar jets|bipolar, jet-like features]] projecting perpendicular to the disk.<ref name=apj684_2_L95/> This accretion disk blocks humans' view of the secondary star, lowering its apparent luminosity and making it difficult for astronomers to pinpoint what its stellar type is. The amount of mass being transferred between the two stars is about {{nowrap|2 × 10<sup>−5</sup> }}[[solar mass]]es per year, or the equivalent of the Sun's mass every 50,000 years, which results in an increase in orbital period of about 19 seconds each year. The [[stellar spectrum|spectrum]] of Beta Lyrae shows emission lines produced by the accretion disc. The disc produces around 20% of the brightness of the system.<ref name=apj684_2_L95/>
 
==Variability밝기 변화==
The1784년 [[variable영국 star|variable아마추어 luminosity]]천문학자 of this구드리케는 system was discovered in 1784 by the British계의 amateur밝기가 astronomer변화하는 [[John것을 Goodricke]]발견했다.<ref name=jha10_23/> 베타 The계의 orbital궤도면은 plane지구로부터의 of시선 this방향과 system거의 is일치하게 nearly놓여 aligned있기 with때문에 the계를 line구성하는 of sight from the Earth, so the two stars periodically항성은 [[eclipse]]주기적으로 each서로를 other가린다. This causes때문에 Beta거문고자리 Lyrae베타의 to겉보기 regularly등급은 change공전 its주기 [[apparent12.9414 magnitude]]일에 from걸쳐 +3.2 to2에서 +4.44까지 over an orbital period of 12변화한다.9414&nbsp;days. It forms the prototype of a class of ellipsoidal타원체 모양의ellipsoidal [[contact binary|"contact" eclipsing binaries]].<ref name=gcvs/>
 
The two components are so close together that they cannot be resolved with optical telescopes, forming a [[spectroscopic binary]]. In 2008, the primary star and the accretion disk of the secondary star were resolved and imaged using the [[CHARA array|CHARA Array]] interferometer<ref name=apj628_453/> and the Michigan InfraRed Combiner (MIRC)<ref name=spie62681P/> in the near infrared H band (see video below), allowing the orbital elements to be computed for the first time.<ref name=apj684_2_L95/>