A Chandra Observation of the Massive Star-Forming
... XLFs constructed from hard band luminosities and total luminosities the ACIS-I FOV compared to those (449) detected in X-ray (uncorrected for absorption) compared with Orion XLF from COUP Three color composite MSX image of NGC 6357. Central cavity and bright nebulosities are clearly seen. ...
... XLFs constructed from hard band luminosities and total luminosities the ACIS-I FOV compared to those (449) detected in X-ray (uncorrected for absorption) compared with Orion XLF from COUP Three color composite MSX image of NGC 6357. Central cavity and bright nebulosities are clearly seen. ...
Introduction: The History and Technique of Stellar Classification
... von Fraunhofer early in the 1800’s, but it was not until late in that century that astronomers were able to routinely examine the spectra of stars in large numbers. Astronomers Angelo Secchi and E.C. Pickering were among the first to note that stellar spectra could be divided into groups by their ge ...
... von Fraunhofer early in the 1800’s, but it was not until late in that century that astronomers were able to routinely examine the spectra of stars in large numbers. Astronomers Angelo Secchi and E.C. Pickering were among the first to note that stellar spectra could be divided into groups by their ge ...
FROM MOLECULAR CLOUDS TO STARS 1 Star formation and the
... producing a large amount of heavy elements (all the atoms heavier than Fe can only be produced by Supernovae). The explosion ejects the largest part of the mass of the stars in the interstellar medium leaving a relatively small fraction (<10 %) of the initial mass in Black Holes or Neutron Stars. I ...
... producing a large amount of heavy elements (all the atoms heavier than Fe can only be produced by Supernovae). The explosion ejects the largest part of the mass of the stars in the interstellar medium leaving a relatively small fraction (<10 %) of the initial mass in Black Holes or Neutron Stars. I ...
Planetary Nebula
... What resemble dainty butterfly wings are actually roiling cauldrons of gas heated to more than 36,000 degrees Fahrenheit. The gas is tearing across space at more than 600,000 miles an hour -- fast enough to travel from Earth to the moon in 24 minutes! A dying star that was once about five times the ...
... What resemble dainty butterfly wings are actually roiling cauldrons of gas heated to more than 36,000 degrees Fahrenheit. The gas is tearing across space at more than 600,000 miles an hour -- fast enough to travel from Earth to the moon in 24 minutes! A dying star that was once about five times the ...
Notes 6 - University of Northern Iowa
... can be used to directly test computer models of not only the evolutionary paths of stars but also stellar pulsation models. But not all stars in this phase are pulsating stars like Cepheids or RR Lyre, so that also needs to be explained. The region of instability is relatively narrow, and star will ...
... can be used to directly test computer models of not only the evolutionary paths of stars but also stellar pulsation models. But not all stars in this phase are pulsating stars like Cepheids or RR Lyre, so that also needs to be explained. The region of instability is relatively narrow, and star will ...
HR Diagram Explorer
... An actual HR Diagram is provided in the upper right panel with an active location indicated by a red x. This active location can be dragged around the diagram. The options panel allows you control the variables plotted on the x-axis: (temperature, B-V, or spectral type) and those plotted on the y-ax ...
... An actual HR Diagram is provided in the upper right panel with an active location indicated by a red x. This active location can be dragged around the diagram. The options panel allows you control the variables plotted on the x-axis: (temperature, B-V, or spectral type) and those plotted on the y-ax ...
9J Gravity and Space
... system was set up more than two thousand years ago, the sun's path was divided into twelve equally spaced "signs," each 30 degrees wide. ...
... system was set up more than two thousand years ago, the sun's path was divided into twelve equally spaced "signs," each 30 degrees wide. ...
Lecture 6: Multiple stars
... A typical cluster has 102 – 104 stars pc3 (compared to <1 for the field) meaning that encounters are at least 102 – 104 more frequent as the collision time goes as (see also later, r is the radius of a star or stellar system): or stellar system ...
... A typical cluster has 102 – 104 stars pc3 (compared to <1 for the field) meaning that encounters are at least 102 – 104 more frequent as the collision time goes as (see also later, r is the radius of a star or stellar system): or stellar system ...
Summary: Modes of Star Formation
... allows binary statistics to be used to infer something about the typical sites of star formation. The field population contains a mix of contributions from starforming regions of all types, and since the frequency of binaries is observed to be lower in dense star-forming regions like the Trapezium c ...
... allows binary statistics to be used to infer something about the typical sites of star formation. The field population contains a mix of contributions from starforming regions of all types, and since the frequency of binaries is observed to be lower in dense star-forming regions like the Trapezium c ...
The masses of stars
... neutron stars, about 1.4 million km for our Sun, and up the largest known star at just under two billion km); of mass (from about a tenth the mass of our Sun to around 100 times greater); of age (some still being formed, while others are perhaps eleven billion years old); of chemical composition (so ...
... neutron stars, about 1.4 million km for our Sun, and up the largest known star at just under two billion km); of mass (from about a tenth the mass of our Sun to around 100 times greater); of age (some still being formed, while others are perhaps eleven billion years old); of chemical composition (so ...
Observational properties of stars
... spectrum, “B” corresponds to blue light, “V” is green, “R” is red and “I” is infrared. There are actually hundreds of different types of filters, some are telescope specific, or are used only by particular observatories. However, the filters given here are the most commonly used in stellar astronomy ...
... spectrum, “B” corresponds to blue light, “V” is green, “R” is red and “I” is infrared. There are actually hundreds of different types of filters, some are telescope specific, or are used only by particular observatories. However, the filters given here are the most commonly used in stellar astronomy ...
Spatial distribution of stars in the Milky Way
... •This may seem anomalous because they are later type than F •But the sample is dominated by giants, which can be observed to (on average) large distances in the disk Note that the faintest stars, M dwarfs, are restricted to the inner 20 pc or so, while progressively brighter stars are seen fill prog ...
... •This may seem anomalous because they are later type than F •But the sample is dominated by giants, which can be observed to (on average) large distances in the disk Note that the faintest stars, M dwarfs, are restricted to the inner 20 pc or so, while progressively brighter stars are seen fill prog ...
CHAPTER 12—STELLAR EVOLUTION
... a. low mass stars form from the interstellar medium very rarely. b. hydrogen fusion combined 4 hydrogen nuclei to form 1 helium nucleus. c. pressure does not depend on temperature in degenerate matter. d. the lower limit represents when the radius of the star would be zero. e. there is a minimum tem ...
... a. low mass stars form from the interstellar medium very rarely. b. hydrogen fusion combined 4 hydrogen nuclei to form 1 helium nucleus. c. pressure does not depend on temperature in degenerate matter. d. the lower limit represents when the radius of the star would be zero. e. there is a minimum tem ...
B LOG - Science Centre
... Betelgeuse (alpha Orionis) is a massive red supergiant that varies in brightness. Bellatrix (gamma Orionis), is blue giant star. Its name means “female warrior”, indicating that Orion may not have always been seen as a male hunter. Bellatrix is the closest of Orion’s stars (243 light years away). Ri ...
... Betelgeuse (alpha Orionis) is a massive red supergiant that varies in brightness. Bellatrix (gamma Orionis), is blue giant star. Its name means “female warrior”, indicating that Orion may not have always been seen as a male hunter. Bellatrix is the closest of Orion’s stars (243 light years away). Ri ...
MAGNITUDE AND COLOR SYSTEMS
... where f is the mean spectral flux density (see Lec. 2) from a source at the top of the Earth’s atmosphere averaged over a defined band and Q is a normalizing constant for that band. Although this definition looks peculiar, it offers two important practical conveniences: (1) Cosmic sources have an en ...
... where f is the mean spectral flux density (see Lec. 2) from a source at the top of the Earth’s atmosphere averaged over a defined band and Q is a normalizing constant for that band. Although this definition looks peculiar, it offers two important practical conveniences: (1) Cosmic sources have an en ...
Lect16-3-28-and-30-1..
... Life tracks on the H-R diagram from main-sequence star to red supergiant for selected high mass stars. (from models by A. Maeder and G. Meynet.) ...
... Life tracks on the H-R diagram from main-sequence star to red supergiant for selected high mass stars. (from models by A. Maeder and G. Meynet.) ...
Constellation Classification Cards*
... brightness is used. In the second set, B, more advanced students are introduced to the additional term, magnitude. In addition, several stars are what are called binaries (a star system with two stars orbiting around their center of mass). In Set B both stars are shown, along with their combined bri ...
... brightness is used. In the second set, B, more advanced students are introduced to the additional term, magnitude. In addition, several stars are what are called binaries (a star system with two stars orbiting around their center of mass). In Set B both stars are shown, along with their combined bri ...
Auriga (constellation)
Auriga is one of the 48 constellations listed by the 2nd-century astronomer Ptolemy and remains one of the 88 modern constellations. Located north of the celestial equator, its name is the Latin word for ""charioteer"", associating it with various mythological charioteers, including Erichthonius and Myrtilus. Auriga is most prominent during winter evenings in the Northern Hemisphere, along with the five other constellations that have stars in the Winter Hexagon asterism. Because of its northern declination, Auriga is only visible in its entirety as far as 34° south; for observers farther south it lies partially or fully below the horizon. A large constellation, with an area of 657 square degrees, it is half the size of the largest constellation, Hydra.Its brightest star, Capella, is an unusual multiple star system among the brightest stars in the night sky. Beta Aurigae is an interesting variable star in the constellation; Epsilon Aurigae, a nearby eclipsing binary with an unusually long period, has been studied intensively. Because of its position near the winter Milky Way, Auriga has many bright open clusters in its borders, including M36, M37, and M38, popular targets for amateur astronomers. In addition, it has one prominent nebula, the Flaming Star Nebula, associated with the variable star AE Aurigae.In Chinese mythology, Auriga's stars were incorporated into several constellations, including the celestial emperors' chariots, made up of the modern constellation's brightest stars. Auriga is home to the radiant for the Aurigids, Zeta Aurigids, Delta Aurigids, and the hypothesized Iota Aurigids.