First Light for May, 2001 - South Bay Astronomical Society
... The transit method can only find systems that are aligned with our line of sight. The Stellar Wobble Method can find planetary systems that are not fully aligned with our line of sight but still have a component that provides a relative motion towards or away from Earth. Thus, the Wobble method pro ...
... The transit method can only find systems that are aligned with our line of sight. The Stellar Wobble Method can find planetary systems that are not fully aligned with our line of sight but still have a component that provides a relative motion towards or away from Earth. Thus, the Wobble method pro ...
How far away are the Stars?
... • If distance to an object is known, we can measure its size. Diameter 2 Dis tan ce ...
... • If distance to an object is known, we can measure its size. Diameter 2 Dis tan ce ...
–1– 2. Milky Way We know a great deal, perhaps more than any
... • A similar, but much larger survey of nearby stars was done by Kapteyn around 1920. He used parallax, proper motions, radial velocities and spectra to infer the distance to stars. He inferred that the size of the MW is about 10 kpc, and the MW is flattened with an axial ratio of 1/5. The Sun is abo ...
... • A similar, but much larger survey of nearby stars was done by Kapteyn around 1920. He used parallax, proper motions, radial velocities and spectra to infer the distance to stars. He inferred that the size of the MW is about 10 kpc, and the MW is flattened with an axial ratio of 1/5. The Sun is abo ...
3P15.pdf
... High resolution spectra of 10 UV Cet type flare stars have been analysed in this work. Age, line profiles, rotation and flux-flux relationships have been studied and the results have been compared with the ones obtained by López-Santiago et al (2004a, b) for a sample of 144 stars, with spectral type ...
... High resolution spectra of 10 UV Cet type flare stars have been analysed in this work. Age, line profiles, rotation and flux-flux relationships have been studied and the results have been compared with the ones obtained by López-Santiago et al (2004a, b) for a sample of 144 stars, with spectral type ...
The Evening Sky Map
... Conjunction – An alignment of two celestial bodies such that they present the least angular separation as viewed from Earth. Constellation – A defined area of the sky containing a star pattern. Diffuse Nebula – A cloud of gas illuminated by nearby stars. Double Star – Two stars that appear close to ...
... Conjunction – An alignment of two celestial bodies such that they present the least angular separation as viewed from Earth. Constellation – A defined area of the sky containing a star pattern. Diffuse Nebula – A cloud of gas illuminated by nearby stars. Double Star – Two stars that appear close to ...
FutureEnvironments
... STAR SYSTEMS A star system can contain one star or multiple stars. Humans are more likely to find habitable planets in systems with single stars. In reality, more than half of all star systems have two or more stars, and these systems typically contain planets that are inhospitable to human life. ST ...
... STAR SYSTEMS A star system can contain one star or multiple stars. Humans are more likely to find habitable planets in systems with single stars. In reality, more than half of all star systems have two or more stars, and these systems typically contain planets that are inhospitable to human life. ST ...
argo and other tidal structures around the milky way
... Several features in these maps can be identified with known satellite galaxies, while others are new findings as the TriAnd + Perseus systems (Rocha-Pinto et al. 2004) and Argo. It is apparent that there is a continuity between the Argo and CMa overdensities. We have verified that when these overden ...
... Several features in these maps can be identified with known satellite galaxies, while others are new findings as the TriAnd + Perseus systems (Rocha-Pinto et al. 2004) and Argo. It is apparent that there is a continuity between the Argo and CMa overdensities. We have verified that when these overden ...
Star Constellations
... Ancient Babylonian astronomers created the Zodiac. The Zodiac is a circle that divides the ecliptic into twelve 30-degree zones. Each zone contains a constellation, many of them animals. Horoscopes based on these astrological signs first appeared in Ptolemaic Egypt in around 50 BC. These early peopl ...
... Ancient Babylonian astronomers created the Zodiac. The Zodiac is a circle that divides the ecliptic into twelve 30-degree zones. Each zone contains a constellation, many of them animals. Horoscopes based on these astrological signs first appeared in Ptolemaic Egypt in around 50 BC. These early peopl ...
Chapter 14
... 2. White dwarfs and neutron stars are both end products of stellar evolution. White dwarfs are composed of mostly carbon, oxygen, and electrons, whereas neutron stars are composed of mostly neutrons. What happens to the protons in the atomic nuclei and the degenerate electrons that were inside the s ...
... 2. White dwarfs and neutron stars are both end products of stellar evolution. White dwarfs are composed of mostly carbon, oxygen, and electrons, whereas neutron stars are composed of mostly neutrons. What happens to the protons in the atomic nuclei and the degenerate electrons that were inside the s ...
The Sun - Our Star - Sierra College Astronomy Home Page
... Coronal gas may heat to 40 million K and X-rays and ultraviolet light are emitted. The Sun’s brightness may increase by 1% during an unusually bright flare. Flares blast out large numbers of very energetic charged particles that will take about 3 days to reach Earth. Large solar flares cause spectac ...
... Coronal gas may heat to 40 million K and X-rays and ultraviolet light are emitted. The Sun’s brightness may increase by 1% during an unusually bright flare. Flares blast out large numbers of very energetic charged particles that will take about 3 days to reach Earth. Large solar flares cause spectac ...
Chapter 10 Neutron Stars and General Relativity
... properties of neutron stars, over a microscopic scale characteristic of nuclear and other sub-atomic interactions the metric is essentially constant. • Thus the microphysics (nuclear and elementary particle interactions) of the neutron star can be described by quantum mechanics implemented in flat s ...
... properties of neutron stars, over a microscopic scale characteristic of nuclear and other sub-atomic interactions the metric is essentially constant. • Thus the microphysics (nuclear and elementary particle interactions) of the neutron star can be described by quantum mechanics implemented in flat s ...
Document
... • More opacity → less geometrical penetration to reach the same optical depth • We see less deep into the stars → pressure is less • But electron pressure increases because of more ionization ...
... • More opacity → less geometrical penetration to reach the same optical depth • We see less deep into the stars → pressure is less • But electron pressure increases because of more ionization ...
Today in Astronomy 102: observations of stellar
... GRO J1655-40 is an X-ray transient source discovered by NASA’s Compton Gamma-Ray Observatory (GRO) in 1994. Rapidly-variable emission in its X-ray bursts: the X-ray object is a few hundred km around. The X-ray source has a stellar companion, a star rather similar to the Sun (about 1.1 M); the X ...
... GRO J1655-40 is an X-ray transient source discovered by NASA’s Compton Gamma-Ray Observatory (GRO) in 1994. Rapidly-variable emission in its X-ray bursts: the X-ray object is a few hundred km around. The X-ray source has a stellar companion, a star rather similar to the Sun (about 1.1 M); the X ...
Beers_First_Stars_NIC_School
... times the solar mass. No clear evidence of supernovae from such supermassive stars has, however, yet been found in the chemical compositions of Milky Way stars. Here we report on an analysis of a very metal-poor star, SDSS J001820.5−093939.2, which possesses elemental-abundance ratios that differ si ...
... times the solar mass. No clear evidence of supernovae from such supermassive stars has, however, yet been found in the chemical compositions of Milky Way stars. Here we report on an analysis of a very metal-poor star, SDSS J001820.5−093939.2, which possesses elemental-abundance ratios that differ si ...
CONSTELLATION DELPHINUS, THE DOLPHIN
... magnitude 3.8, 241 light-years from Earth. • Beta Delphini, the brightest star in Delphinus is called Rotanev. It is a close binary star and, as noted by the American astronomer S. W. Burnham in 1873, divisible in only large amateur telescopes. To the unaided eye, it appears to be a white star of ma ...
... magnitude 3.8, 241 light-years from Earth. • Beta Delphini, the brightest star in Delphinus is called Rotanev. It is a close binary star and, as noted by the American astronomer S. W. Burnham in 1873, divisible in only large amateur telescopes. To the unaided eye, it appears to be a white star of ma ...
A-level Physics A Question paper Unit 05 - Section 2A
... Describe the physical processes that give rise to the shape of each graph. Go on to show how the information in the graphs can be used to determine properties, such as the speed and period, of the Menkalinan binary system. You should include appropriate calculations in your answer. The quality of yo ...
... Describe the physical processes that give rise to the shape of each graph. Go on to show how the information in the graphs can be used to determine properties, such as the speed and period, of the Menkalinan binary system. You should include appropriate calculations in your answer. The quality of yo ...
PHYS_3380_100714_bw - The University of Texas at Dallas
... In stars heavier than about 2 solar masses, in which the core temperature is more than about 18 million K, the dominant process in which energy is produced by the fusion of hydrogen into helium is a different reaction chain known as the carbon-nitrogen cycle. ...
... In stars heavier than about 2 solar masses, in which the core temperature is more than about 18 million K, the dominant process in which energy is produced by the fusion of hydrogen into helium is a different reaction chain known as the carbon-nitrogen cycle. ...
IK Pegasi
IK Pegasi (or HR 8210) is a binary star system in the constellation Pegasus. It is just luminous enough to be seen with the unaided eye, at a distance of about 150 light years from the Solar System.The primary (IK Pegasi A) is an A-type main-sequence star that displays minor pulsations in luminosity. It is categorized as a Delta Scuti variable star and it has a periodic cycle of luminosity variation that repeats itself about 22.9 times per day. Its companion (IK Pegasi B) is a massive white dwarf—a star that has evolved past the main sequence and is no longer generating energy through nuclear fusion. They orbit each other every 21.7 days with an average separation of about 31 million kilometres, or 19 million miles, or 0.21 astronomical units (AU). This is smaller than the orbit of Mercury around the Sun.IK Pegasi B is the nearest known supernova progenitor candidate. When the primary begins to evolve into a red giant, it is expected to grow to a radius where the white dwarf can accrete matter from the expanded gaseous envelope. When the white dwarf approaches the Chandrasekhar limit of 1.44 solar masses (M☉), it may explode as a Type Ia supernova.