Video Experimental Relacionado
Updated: Jul 12, 2026
10:35
Bringing the Visible Universe into Focus with Robo-AO
Published on: February 12, 2013
Un toro polvoriento alrededor de la joven y luminosa estrella LkH alpha101
P G Tuthill1, J D Monnier, W C Danchi
1Astronomy Department, School of Physics, University of Sydney, NSW, Australia. gekko@physics.usyd.edu.au
Nature
|March 10, 2001
Resumen
Los astrónomos resolvieron el disco de acreción interno de la joven estrella LkH alpha101, revelando una gran brecha central y un borde interior caliente. Esto sugiere que la sublimación del polvo por la radiación estelar da forma a los discos estelares jóvenes.
Área de la Ciencia:
- La astronomía y la astrofísica.
- Evolución Estelar Evolución Estelar
- Ciencia exoplanetaria Ciencia de los exoplanetas.
Sus antecedentes:
- La formación estelar implica el colapso de nubes de gas y polvo, formando una estrella central rodeada por un disco de acreción giratorio.
- La estructura y la evolución de estos discos de acreción no se comprenden completamente debido a los limitados datos morfológicos de alta resolución e incertidumbres del proceso físico.
Objetivo del estudio:
- Para resolver la estructura del disco de acreción interno de una estrella joven, LkH alpha101, utilizando imágenes de alta resolución.
- Para investigar los procesos físicos que dan forma al disco de acreción interno y comparar las observaciones con las predicciones teóricas.
Principales métodos:
- Imágenes de alta resolución de la joven estrella LkH alpha101.1.
- Análisis morfológico de la estructura interna del disco de acreción, incluyendo el tamaño de la brecha y las características del borde interno.
Principales resultados:
- El disco de acreción interno de LkH alpha101 se resolvió, mostrando una orientación casi cara a cara.
- Se observó una brecha central (cavidad), más grande de lo previsto por los modelos actuales.
- Se identificó un borde interior caliente, probablemente formado por la sublimación del polvo debido a la radiación estelar directa.
Conclusiones:
- Las características observadas desafían los modelos existentes de evolución del disco de acreción.
- La radiación estelar directa que causa la sublimación del polvo se propone como el mecanismo principal que determina la posición del borde interno.
- Se necesita más investigación para refinar los modelos de evolución y composición del disco estelar joven.
Videos de Conceptos Relacionados
01:10Kepler'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,...
01:21Schwarzschild Radius and Event Horizon
No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape velocity with the...
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape velocity with the...
01:10Detection of Black Holes
Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
01:28Toroids
A toroid is a closely wound donut-shaped coil constructed using a single conducting wire. In general, it is assumed that a toriod consists of multiple circular loops perpendicular to its axis.
When connected to a supply, the magnetic field generated in the toroid has field lines circular and concentric to its axis. Conventionally, the direction of this magnetic field is expressed using the right-hand rule. If the fingers of the right hand curl in the current direction, the thumb points in the...
When connected to a supply, the magnetic field generated in the toroid has field lines circular and concentric to its axis. Conventionally, the direction of this magnetic field is expressed using the right-hand rule. If the fingers of the right hand curl in the current direction, the thumb points in the...
01:02Flame Photometry: Overview
Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
01:16Flame Photometry: Lab
In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...