Video Experimental Relacionado
Updated: Nov 29, 2025
10:09
Photobleaching Enables Super-resolution Imaging of the FtsZ Ring in the Cyanobacterium Prochlorococcus
Published on: November 6, 2018
6.6K
Una nebulosa de anillo azul de una fusión estelar hace varios miles de años
Keri Hoadley1, D Christopher Martin2, Brian D Metzger3,4
1Cahill Center for Astrophysics, California Institute of Technology, Pasadena, CA, USA. khoadley@caltech.edu.
Nature
|November 19, 2020
Resumen
Los investigadores observaron una nebulosa azul única y su estrella central, TYC 2597-735-1, revelando una vista sin obstáculos de una fusión estelar reciente. Esto proporciona una rara oportunidad para estudiar las etapas intermedias de la evolución estelar después de un evento de fusión.
Área de la Ciencia:
- Astronomía y astrofísica
- Evolución estelar
- Sistemas de estrellas binarias
Sus antecedentes:
- Las fusiones estelares son fases comunes pero breves en la evolución de las estrellas binarias, que influyen en la creación de estrellas atípicas y fusiones de objetos compactos.
- Las observaciones anteriores de fusiones estelares fueron oscurecidas por el polvo, lo que impidió un estudio detallado de los estados finales.
Objetivo del estudio:
- Para observar y analizar un evento inusual de fusión estelar y su remanente.
- Estudiar la etapa evolutiva intermedia entre el inicio y el equilibrio de una fusión estelar.
Principales métodos:
- Observaciones de una nebulosa ultravioleta en forma de anillo y su estrella central, TYC 2597-735-1.
- Análisis espectral de TYC 2597-735-1, incluida la emisión de Hα, las variaciones de velocidad radial y el exceso de infrarrojos.
- Comparación con los modelos de evolución estelar.
Principales resultados:
- Descubrimiento de un flujo bipolar de TYC 2597-735-1, indicado por la nebulosa del anillo.
- TYC 2597-735-1 exhibe las características de una estrella vieja con una gravedad superficial inusualmente baja, desintegración de la luminosidad y signos de acreción.
- La evidencia sugiere que TYC 2597-735-1 se fusionó con un compañero de menor masa hace varios miles de años.
Conclusiones:
- TYC 2597-735-1 ofrece una vista sin precedentes de una fusión estelar en curso.
- Este sistema permite el estudio directo del proceso de fusión en una etapa evolutiva crucial.
- Los hallazgos mejoran nuestra comprensión de las poblaciones estelares y la evolución de los sistemas binarios.
Videos de Conceptos Relacionados
01:10Detection of Black Holes
2.4K
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...
2.4K
01:21Schwarzschild Radius and Event Horizon
2.4K
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...
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...
2.4K
02:15The Contractile Ring
6.9K
Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
6.9K
02:45Nuclear Fusion
33.1K
The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
33.1K
02:06Conditions on Early Earth
99.7K
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
99.7K
02:39Emission Spectra
73.9K
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
73.9K