関連する実験動画
Updated: May 23, 2026

10:35
Bringing the Visible Universe into Focus with Robo-AO
Published on: February 12, 2013
RR-Lyrae型の脈動は,二重星系にある太陽質量0.26の恒星からのものです
G Pietrzyński1, I B Thompson, W Gieren
1Departamento de Astronomìa, Universidad de Concepción, Casilla 160-C, Concepciòn, Chile. pietrzyn@astrouw.edu.pl
Nature
|April 7, 2012
まとめ
奇妙な RR Lyrae 星は,日食のバイナリ系にある低質量物体であることが判明しました. この発見は,珍しいものの,このような二重星系は真のRRライレー星を模倣し,恒星集団の研究に影響を与える可能性があることを示唆しています.
科学分野:
- * 天文学と天体物理学
- * 恒星の進化について
- *銀河系考古学について
背景:
- * RRライア星は,銀河の年齢と銀河外距離の決定に不可欠です.
- * RRライレー星は通常,古く,質量が少ない脈動星です.
- * RRライレー星の質量を理解することは,正確な天体物理学モデルにとって不可欠です.
研究 の 目的:
- * RRライア星OGLE-BLG-RRLYR-02792.の質量を測定するために
- * 超食バイナリ系内の恒星の進化経路を調査する.
- * RRライレー星を距離指標として使用する二進星系の影響を評価する.
主な方法:
- * 超食バイナリ系からのフォトメトリックデータの分析.
- * 観測された特性を説明するための恒星の進化モデリング.
- * パルサーの特性を,古典的なRRライア星のモデルと比較した.
主要な成果:
- * OGLE-BLG-RRLYR-02792の質量は0.26太陽質量であり,古典的なRRライレー星と一致しない.
- * システムの性質は,初期質量が1.0 Mと0.8 Mのバイナリシステムの進化によって説明されています.
- *観測されたパルサターは,質量交換により,RRライレー星を模倣する短命の相にある.
結論:
- * 研究対象は,古典的なRRライレー星ではなく,進化した二進星系である.
- * バイナリー・インターローバーは,RR Lyrae星の0.2%のみを汚染すると推定されています.
- * RRライレー星からの距離は,このような二重星系によって著しく影響を受ける可能性は低い.
関連する概念動画
Kepler's Second Law of Planetary Motion
In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. His first law states that all planets orbit the Sun in an elliptical orbit, with the Sun at one of the ellipse's foci. Therefore, the distance of a planet from the Sun varies throughout its revolution around the Sun.
While in an elliptical orbit, the total energy of the planet is conserved. Therefore, the planet slows down when it is at apogee and...
While in an elliptical orbit, the total energy of the planet is conserved. Therefore, the planet slows down when it is at apogee and...
Kepler's First Law of Planetary Motion
In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. He formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe.
Polish astronomer Nikolaus Copernicus put forth a theory that stated a heliocentric model for the solar system. According to this heliocentric theory, all the planets, including Earth, orbit the Sun in circular orbits.
On the other hand,...
Polish astronomer Nikolaus Copernicus put forth a theory that stated a heliocentric model for the solar system. According to this heliocentric theory, all the planets, including Earth, orbit the Sun in circular orbits.
On the other hand,...
Kepler's Third Law of Planetary Motion
In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. In 1909, he formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe. However, in 1918, he published his third law of planetary motion, which gives a precise mathematical relationship between a planet's average distance from the Sun and the amount of time it takes to revolve around the Sun. It...
Atomic Nuclei: Larmor Precession Frequency
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
Reduced Mass Coordinates: Isolated Two-body Problem
In classical mechanics, the two-body problem is one of the fundamental problems describing the motion of two interacting bodies under gravity or any other central force. When considering the motion of two bodies, one of the most important concepts is the reduced mass coordinates, a quantity that allows the two-body problem to be solved like a single-body problem. In these circumstances, it is assumed that a single body with reduced mass revolves around another body fixed in a position with an...
Second Order systems II
In an underdamped second-order system, where the damping ratio ζ is between 0 and 1, a unit-step input results in a transfer function that, when transformed using the inverse Laplace method, reveals the output response. The output exhibits a damped sinusoidal oscillation, and the difference between the input and output is termed the error signal. This error signal also demonstrates damped oscillatory behavior. Eventually, as the system reaches a steady state, the error diminishes to zero.
If ζ...
If ζ...

