Introduction - Departamento de Astronomía
... the falling matter becames very hot and expands outwards. Finally, the star explodes and ejects the star’s outer layers into space. All that remains of is a very dense object: neutron star or black hole ...
... the falling matter becames very hot and expands outwards. Finally, the star explodes and ejects the star’s outer layers into space. All that remains of is a very dense object: neutron star or black hole ...
Document
... • This hot gas can break out of the galactic disk and produce a galactic fountain • As the gas cools, it falls back to the disk, spreading heavy elements throughout the galaxy ...
... • This hot gas can break out of the galactic disk and produce a galactic fountain • As the gas cools, it falls back to the disk, spreading heavy elements throughout the galaxy ...
VLA HI Zeeman Observations of the Cygnus X Region: Abstract
... The Very Large Array in Socorro, New Mexico has been used to study the Zeeman Effect in the 21cm HI line seen in absorption against radio sources in the Cygnus X region. Cygnus X is geometrically favorable for Zeeman effect observations as the region lies along the mean field direction of the diffus ...
... The Very Large Array in Socorro, New Mexico has been used to study the Zeeman Effect in the 21cm HI line seen in absorption against radio sources in the Cygnus X region. Cygnus X is geometrically favorable for Zeeman effect observations as the region lies along the mean field direction of the diffus ...
AST1100 Lecture Notes
... another another possibility: spectral classes. Stars are classified according to their spectral class which consists of a letter and a number. This historical classification is based on the strength of different spectral lines found in the spectra of the stars. It turned out later that these spectra ...
... another another possibility: spectral classes. Stars are classified according to their spectral class which consists of a letter and a number. This historical classification is based on the strength of different spectral lines found in the spectra of the stars. It turned out later that these spectra ...
New light on our Sun`s fate - Space Telescope Science Institute
... and I calculated, it will be a normal white dwarf with 54 percent of its present weight (see “Stellar weight loss” above). Like the white-dwarf-progenitor stars within globular cluster 47 Tuc, our Sun will end up with a fraction of the mass it was born with. Just as it lived a relatively boring life ...
... and I calculated, it will be a normal white dwarf with 54 percent of its present weight (see “Stellar weight loss” above). Like the white-dwarf-progenitor stars within globular cluster 47 Tuc, our Sun will end up with a fraction of the mass it was born with. Just as it lived a relatively boring life ...
High-Resolution Spectroscopy of the Transiting Planet Host Star
... To this end, we utilized the BVJHK apparent magnitudes to derive several Tef f estimates based on a number of empirical color-temperature calibrations from the literature. The Johnson B and V magnitudes for TrES-1 were obtained by means of differential photometry (including differential extinction) ...
... To this end, we utilized the BVJHK apparent magnitudes to derive several Tef f estimates based on a number of empirical color-temperature calibrations from the literature. The Johnson B and V magnitudes for TrES-1 were obtained by means of differential photometry (including differential extinction) ...
N5128PNSydney
... emitted in a single collisionally excited line O++ 1D2 – 3P2 [O III]5007Å This strong line allows detection of PN; high [O III]/Hα ratio discriminates against H I I regions Other lines of H, He, N, Ne, Ar, S prominent in optical spectra of PN Line ratios dependent on Te, Ne and abundance Some line r ...
... emitted in a single collisionally excited line O++ 1D2 – 3P2 [O III]5007Å This strong line allows detection of PN; high [O III]/Hα ratio discriminates against H I I regions Other lines of H, He, N, Ne, Ar, S prominent in optical spectra of PN Line ratios dependent on Te, Ne and abundance Some line r ...
Milky Way Bulge
... • Discovered in 1994 from star counts + radial velocity study of K,M giants towards Galactic Center. • ~5 x 109 M • ~17 kpc beyond GC, and currently falling into disk ...
... • Discovered in 1994 from star counts + radial velocity study of K,M giants towards Galactic Center. • ~5 x 109 M • ~17 kpc beyond GC, and currently falling into disk ...
Article PDF - IOPscience
... of the system given in Table 1, we find that the semimajor axis of the orbit is 0.2 AU, or about 22 stellar radii, and that the feature extends over about one-third of the circumference of the orbit, assuming that it is not highly eccentric. Clearly, it must consist of a myriad of smaller objects th ...
... of the system given in Table 1, we find that the semimajor axis of the orbit is 0.2 AU, or about 22 stellar radii, and that the feature extends over about one-third of the circumference of the orbit, assuming that it is not highly eccentric. Clearly, it must consist of a myriad of smaller objects th ...
Earth v. Black Hole
... At some point the farther out planets will be pulled harder by the black hole. At first, people won’t notice too much, even though the orbit starts to change somewhat. ...
... At some point the farther out planets will be pulled harder by the black hole. At first, people won’t notice too much, even though the orbit starts to change somewhat. ...
Unit 3 - Lesson 8.9 Life of Stars Challenge
... These coloured Super Giants have luminosities often 1,000,000X greater than the Sun The explosive death of a star A cloud of hydrogen gas and dust in space. When the gravitational and pressure forces within the initial cloud become unbalanced, the cloud collapses and breaks into small fragments. The ...
... These coloured Super Giants have luminosities often 1,000,000X greater than the Sun The explosive death of a star A cloud of hydrogen gas and dust in space. When the gravitational and pressure forces within the initial cloud become unbalanced, the cloud collapses and breaks into small fragments. The ...
Trojan clusters objects
... This is a stellar type (for instance G5V for the Sun). It is used to instantiate stars without having to ...
... This is a stellar type (for instance G5V for the Sun). It is used to instantiate stars without having to ...
in the milky way - Chandra X
... THE GALACTIC CENTER: A panoramic X-ray view, covering a 900-by-400 light-year swath, shows that the center of the Galaxy is a teeming and tumultuous place. There are supernova remnants: SNR 0.9-0.1, Sagittarius A East, and probably the X-ray Thread. There are many bright X-ray sources, which astrono ...
... THE GALACTIC CENTER: A panoramic X-ray view, covering a 900-by-400 light-year swath, shows that the center of the Galaxy is a teeming and tumultuous place. There are supernova remnants: SNR 0.9-0.1, Sagittarius A East, and probably the X-ray Thread. There are many bright X-ray sources, which astrono ...
Distances of the Stars
... The smallest parallax measurable from the ground is about 0.01-arcsec • Measure distances out to ~100 pc • Get 10% distances only to a few parsecs. • But, only a few hundred stars this close ...
... The smallest parallax measurable from the ground is about 0.01-arcsec • Measure distances out to ~100 pc • Get 10% distances only to a few parsecs. • But, only a few hundred stars this close ...
Open Houses at the Campus Observatory Astronomical Horizons Lecture
... left behind by a massive-star supernova Degeneracy pressure of neutrons supports a neutron star against gravity ...
... left behind by a massive-star supernova Degeneracy pressure of neutrons supports a neutron star against gravity ...
Chapter 13 The Life of a Star The Life of a Star Mass Is the Key The
... supernova explosion sweeping up interstellar material as it goes is called a supernova remnant – During a 1-100 year time frame, a supernova will expand from 0.03 ly to several light-years in diameter – Supernova remnants have a more ragged look compared to planetary and other nebulae ...
... supernova explosion sweeping up interstellar material as it goes is called a supernova remnant – During a 1-100 year time frame, a supernova will expand from 0.03 ly to several light-years in diameter – Supernova remnants have a more ragged look compared to planetary and other nebulae ...
The Evolution of Coronal X
... The ionised outflow locks to open magnetic field lines until it decouples at some distance well away from the solar surface. This process removes angular momentum. The spin down rate depends on the strength of the stellar magnetic field and the mass loss rate, such that an early dispersion of rotati ...
... The ionised outflow locks to open magnetic field lines until it decouples at some distance well away from the solar surface. This process removes angular momentum. The spin down rate depends on the strength of the stellar magnetic field and the mass loss rate, such that an early dispersion of rotati ...
Production of Manganese-53 in a Self
... Fig. 1 shows the mass fraction of 53Mn in the ejecta (as a function of interior mass coordinate) from an initially 40 Solar mass star [3]. The abundance of 53Mn is strongly concentrated towards the innermost zones in the stellar ejecta. Fig. 1 also shows that, if matter inside a mass cut at an inter ...
... Fig. 1 shows the mass fraction of 53Mn in the ejecta (as a function of interior mass coordinate) from an initially 40 Solar mass star [3]. The abundance of 53Mn is strongly concentrated towards the innermost zones in the stellar ejecta. Fig. 1 also shows that, if matter inside a mass cut at an inter ...
Cygnus X-1
Cygnus X-1 (abbreviated Cyg X-1) is a well-known galactic X-ray source, thought to be a black hole, in the constellation Cygnus. It was discovered in 1964 during a rocket flight and is one of the strongest X-ray sources seen from Earth, producing a peak X-ray flux density of 6977229999999999999♠2.3×10−23 Wm−2 Hz−1 (7003230000000000000♠2.3×103 Jansky). Cygnus X-1 was the first X-ray source widely accepted to be a black hole and it remains among the most studied astronomical objects in its class. The compact object is now estimated to have a mass about 14.8 times the mass of the Sun and has been shown to be too small to be any known kind of normal star, or other likely object besides a black hole. If so, the radius of its event horizon is about 7004440000000000000♠44 km.Cygnus X-1 belongs to a high-mass X-ray binary system about 7019574266339685654♠6070 ly from the Sun that includes a blue supergiant variable star designated HDE 226868 which it orbits at about 0.2 AU, or 20% of the distance from the Earth to the Sun. A stellar wind from the star provides material for an accretion disk around the X-ray source. Matter in the inner disk is heated to millions of degrees, generating the observed X-rays. A pair of jets, arranged perpendicular to the disk, are carrying part of the energy of the infalling material away into interstellar space.This system may belong to a stellar association called Cygnus OB3, which would mean that Cygnus X-1 is about five million years old and formed from a progenitor star that had more than 7001400000000000000♠40 solar masses. The majority of the star's mass was shed, most likely as a stellar wind. If this star had then exploded as a supernova, the resulting force would most likely have ejected the remnant from the system. Hence the star may have instead collapsed directly into a black hole.Cygnus X-1 was the subject of a friendly scientific wager between physicists Stephen Hawking and Kip Thorne in 1975, with Hawking betting that it was not a black hole. He conceded the bet in 1990 after observational data had strengthened the case that there was indeed a black hole in the system. This hypothesis has not been confirmed due to a lack of direct observation but has generally been accepted from indirect evidence.