The birth and life of stars
... The most massive pre–main-sequence stars take the shortest time to become main-sequence stars (O and B stars). In the final stages of pre–main-sequence contraction, when hydrogen fusion is about to begin in the core, the pre–main-sequence star may undergo vigorous chromospheric activity that eje ...
... The most massive pre–main-sequence stars take the shortest time to become main-sequence stars (O and B stars). In the final stages of pre–main-sequence contraction, when hydrogen fusion is about to begin in the core, the pre–main-sequence star may undergo vigorous chromospheric activity that eje ...
Ch13_Lecture - Chemistry at Winthrop University
... the main sequence • Generally, 90% of a group of stars will be on the main sequence; however, a few stars will be cool but very luminous (upper right part of H-R diagram), while others will be hot and dim (lower left part of H-R ...
... the main sequence • Generally, 90% of a group of stars will be on the main sequence; however, a few stars will be cool but very luminous (upper right part of H-R diagram), while others will be hot and dim (lower left part of H-R ...
1705 Star Charts
... The Evening Sky in May 2017 Two bright planets and the brightest stars share the evening sky this May. Soon after sunset golden Jupiter appears in the northeast. Beside Jupiter is Spica, the brightest star in Virgo. Below Jupiter, near the horizon, is orange Arcturus, the brightest star in the nort ...
... The Evening Sky in May 2017 Two bright planets and the brightest stars share the evening sky this May. Soon after sunset golden Jupiter appears in the northeast. Beside Jupiter is Spica, the brightest star in Virgo. Below Jupiter, near the horizon, is orange Arcturus, the brightest star in the nort ...
distant stars nearby star parallax angle The principle of geometrical
... Does the star Vega in Lyra appear exceptionally bright because it’s an intrinsically bright star, or simply because it’s unusually close by? What about Betelgeuse in Orion? If we didn’t know the distances to these stars, we wouldn’t know that Betelgeuse is a red giant star, with a much greater intri ...
... Does the star Vega in Lyra appear exceptionally bright because it’s an intrinsically bright star, or simply because it’s unusually close by? What about Betelgeuse in Orion? If we didn’t know the distances to these stars, we wouldn’t know that Betelgeuse is a red giant star, with a much greater intri ...
20 pm - Starmap
... The Ptolemy cluster. Can be viewed with the naked eye, and identified as a brighter zone in the Milky Way. Antares. A red super giant in the Milky Way. Its name comes from ancient greek 'Against Ares', being compared to the planet Mars. ...
... The Ptolemy cluster. Can be viewed with the naked eye, and identified as a brighter zone in the Milky Way. Antares. A red super giant in the Milky Way. Its name comes from ancient greek 'Against Ares', being compared to the planet Mars. ...
3-color photometry of stellar cluster - Kiepenheuer
... Beforehand one should decide which star cluster should be observed. In good practice one determines important properties (angular diameter, position, brightness...) of this specific cluster and then also looks for possible standard sources. One should also keep in mind that the specific object shoul ...
... Beforehand one should decide which star cluster should be observed. In good practice one determines important properties (angular diameter, position, brightness...) of this specific cluster and then also looks for possible standard sources. One should also keep in mind that the specific object shoul ...
Hypervelocity Globular: A beacon of merging clusters Oleg Gnedin with Alexey Vikhlinin
... for BH mass ratio 1:10 to 1:3 To achieve the observed offset of 2300 km/s, HVGC needs to have come within d = 2-6 pc of M87 BH To survive tidal field of BH at distance d, HVGC needs to have minimum average density 4e9 Msun/pc3 d(pc)-3 ...
... for BH mass ratio 1:10 to 1:3 To achieve the observed offset of 2300 km/s, HVGC needs to have come within d = 2-6 pc of M87 BH To survive tidal field of BH at distance d, HVGC needs to have minimum average density 4e9 Msun/pc3 d(pc)-3 ...
Star Information ppt.
... stars like our sun that are fusing hydrogen into helium in their cores. Luminous mainsequence stars are hot (blue) Less luminous ones are cooler (yellow or red) ...
... stars like our sun that are fusing hydrogen into helium in their cores. Luminous mainsequence stars are hot (blue) Less luminous ones are cooler (yellow or red) ...
Ch 28 Class Notes
... A small star grouping, or sub-grouping of a constellation is called an _____________________. We are familiar with the constellation known as Ursa Major (the Great Bear). Within _____________________________ is the Big Dipper. The Big Dipper is an asterism in the shape of a dipper and handle. The tw ...
... A small star grouping, or sub-grouping of a constellation is called an _____________________. We are familiar with the constellation known as Ursa Major (the Great Bear). Within _____________________________ is the Big Dipper. The Big Dipper is an asterism in the shape of a dipper and handle. The tw ...
Stellar Characteristics and Evolution
... Flash. The spectral type and luminosity is not constant however, and some stars can evolve though a large spread of spectral types while in the Horizontal Branch. Eventually, the Helium in the core is exhausted and converted to carbon. The core becomes degenerate and collapses, and the star expands ...
... Flash. The spectral type and luminosity is not constant however, and some stars can evolve though a large spread of spectral types while in the Horizontal Branch. Eventually, the Helium in the core is exhausted and converted to carbon. The core becomes degenerate and collapses, and the star expands ...
Surveying the Stars
... stars are fusing hydrogen into helium in their cores like the Sun Luminous mainsequence stars are hot (blue) Less luminous ones are cooler (yellow or red) ...
... stars are fusing hydrogen into helium in their cores like the Sun Luminous mainsequence stars are hot (blue) Less luminous ones are cooler (yellow or red) ...
Solutions Assignment #3
... Antares has the largest radius because it is the only supergiant on the list. j. Aldebaran, Antares, and Canopus have luminosity classes other than V, which means that they have left the main sequence and are no longer burning hydrogen in their cores. k. Spica is the most massive of the main-sequenc ...
... Antares has the largest radius because it is the only supergiant on the list. j. Aldebaran, Antares, and Canopus have luminosity classes other than V, which means that they have left the main sequence and are no longer burning hydrogen in their cores. k. Spica is the most massive of the main-sequenc ...
Document
... • Get a reference image R. This is either a synthetic image (point sources) or a real data frame taken under good seeing ...
... • Get a reference image R. This is either a synthetic image (point sources) or a real data frame taken under good seeing ...
Red Giants - Faculty Web Pages
... Most blue stars are Main Sequence stars. But whereas some red stars in the list are simply tiny, cool Main Sequence stars, other red stars of the exact same color are huge Red Giants! Telling the difference between the Main Sequence red stars and the Red Giant stars involves some complex measurement ...
... Most blue stars are Main Sequence stars. But whereas some red stars in the list are simply tiny, cool Main Sequence stars, other red stars of the exact same color are huge Red Giants! Telling the difference between the Main Sequence red stars and the Red Giant stars involves some complex measurement ...
The Milky Way * A Classic Galaxy
... Udalski et al. 2001), as long as one uses infrared luminosities. This is what modern astronomers do. (in the old days, before IR technology, this issue caused a lot of confusion in using Cepheids as distance indicators!) ...
... Udalski et al. 2001), as long as one uses infrared luminosities. This is what modern astronomers do. (in the old days, before IR technology, this issue caused a lot of confusion in using Cepheids as distance indicators!) ...
Ch 11c and 12 ( clusters 3-31-11)
... stars we born at the same time, we can measure a cluster’s age by finding the main sequence turnoff point on an H–R diagram of its stars. The cluster’s age is equal to the hydrogenburning lifetime of the hottest, most luminous stars that remain on the main sequence. ...
... stars we born at the same time, we can measure a cluster’s age by finding the main sequence turnoff point on an H–R diagram of its stars. The cluster’s age is equal to the hydrogenburning lifetime of the hottest, most luminous stars that remain on the main sequence. ...
Astronomy (C) - North Carolina Science Olympiad
... galaxy of Milky Way As with 47 Tucanae, more than one population of stars visible Suggests that many globular clusters have rich history of interaction with galaxies & molecular clouds ...
... galaxy of Milky Way As with 47 Tucanae, more than one population of stars visible Suggests that many globular clusters have rich history of interaction with galaxies & molecular clouds ...
Measuring the Properties of Stars - Sierra College Astronomy Home
... Knowledge of the size of one of the star’s ellipses, along with knowledge of the period of its motion, permits calculation of the total mass of the two stars. To determine how the system’s total mass is distributed between the two stars, one need only consider the ratio of the two stars’ distances t ...
... Knowledge of the size of one of the star’s ellipses, along with knowledge of the period of its motion, permits calculation of the total mass of the two stars. To determine how the system’s total mass is distributed between the two stars, one need only consider the ratio of the two stars’ distances t ...
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.