15.1 Introduction
... and UV spectra are dominated by strong, broad emission lines instead of the narrow absorption lines that are typical of ‘normal’ stars (Figure 15.3). The emission lines are so strong that they were first noticed as early as 1867 by... Charles Wolf and Georges Rayet (!) using the 40 cm Foucault teles ...
... and UV spectra are dominated by strong, broad emission lines instead of the narrow absorption lines that are typical of ‘normal’ stars (Figure 15.3). The emission lines are so strong that they were first noticed as early as 1867 by... Charles Wolf and Georges Rayet (!) using the 40 cm Foucault teles ...
File - Mr. Catt`s Class
... 11. A supercluster is a group of clusters of galaxies. Our local supercluster contains the local group and the Virgo cluster. Between superclusters are great voids with no galaxies. 12. It seems that matter in the universe forms a cosmic web in which galaxies are formed along filaments of normal and ...
... 11. A supercluster is a group of clusters of galaxies. Our local supercluster contains the local group and the Virgo cluster. Between superclusters are great voids with no galaxies. 12. It seems that matter in the universe forms a cosmic web in which galaxies are formed along filaments of normal and ...
12.1 Introduction
... Stellar evolution, as opposed to equilibrium, can be reproduced in our computers by solving a series of equilibrium stellar models—normally referred to as a stellar evolution track—in which one updates in steps the gradual enrichment by elements heavier than hydrogen at different radii within the st ...
... Stellar evolution, as opposed to equilibrium, can be reproduced in our computers by solving a series of equilibrium stellar models—normally referred to as a stellar evolution track—in which one updates in steps the gradual enrichment by elements heavier than hydrogen at different radii within the st ...
Starfarer
... steer towards whichever star rises or sets in the direction of the island destination. The bearing of the destination is the azimuth or bearing of its guiding star, at rise if the course is an easterly one and at set if it is westerly. Although stars rise 4 minutes earlier each night, so that after ...
... steer towards whichever star rises or sets in the direction of the island destination. The bearing of the destination is the azimuth or bearing of its guiding star, at rise if the course is an easterly one and at set if it is westerly. Although stars rise 4 minutes earlier each night, so that after ...
Globular Clusters
... could disappear. On the other hand, we know today that four clusters in Sagittarius (M54 in particular) are likely members of the Sagittarius Dwarf Elliptical Galaxy (discovered in 1994), currently merging into the central regions of the Milky Way. A large majority of the galactic GCs have high rela ...
... could disappear. On the other hand, we know today that four clusters in Sagittarius (M54 in particular) are likely members of the Sagittarius Dwarf Elliptical Galaxy (discovered in 1994), currently merging into the central regions of the Milky Way. A large majority of the galactic GCs have high rela ...
VISIBLE STARS AS APPARENT OBSERVATIONAL EVIDENCE IN
... the premise that, although the earth's motion in its annual orbit produces some curious and extremely large changes in the case of the planets, it does not cause any similar effects in the case of the fixed stars; they calculate that the stellar sphere would have to be so far away that a fixed star ...
... the premise that, although the earth's motion in its annual orbit produces some curious and extremely large changes in the case of the planets, it does not cause any similar effects in the case of the fixed stars; they calculate that the stellar sphere would have to be so far away that a fixed star ...
Mass determinations of PMS stars with the
... • We already had observations of BS Indi (K=6.6 mag) with AMBER but the signal resulted to be too faint (+ no standard observed) • In this period our brightest (HD113449) candidate will be observed with AMBER • We hope to observe all targets with the VLTI (UTs or ATs + fringe tracker) to put constra ...
... • We already had observations of BS Indi (K=6.6 mag) with AMBER but the signal resulted to be too faint (+ no standard observed) • In this period our brightest (HD113449) candidate will be observed with AMBER • We hope to observe all targets with the VLTI (UTs or ATs + fringe tracker) to put constra ...
The Milky Way Model - University of Chicago
... Milky Way appears to rotate around a central point. Perhaps most astonishingly, the buzzing hive of stars that populate the Galactic center reveal an incredibly massive but invisible object in the middle of it all: a super-massive black hole! ...
... Milky Way appears to rotate around a central point. Perhaps most astonishingly, the buzzing hive of stars that populate the Galactic center reveal an incredibly massive but invisible object in the middle of it all: a super-massive black hole! ...
AUI CA science talk - National Radio Astronomy Observatory
... • [Even SKA project office admits full SKA is not realizable in next decade.] • Near term: Narrow focus to quantify how NRAO facilities will make major strides in addressing the SKA KSP goals, as well as delineate the requisite upgrades, or development work on plausible new facilities. • Naturally p ...
... • [Even SKA project office admits full SKA is not realizable in next decade.] • Near term: Narrow focus to quantify how NRAO facilities will make major strides in addressing the SKA KSP goals, as well as delineate the requisite upgrades, or development work on plausible new facilities. • Naturally p ...
AST1100 Lecture Notes
... Several stars show periodic changes in their apparent magnitudes. This was first thought to be caused by dark spots on a rotating star’s surface: When the dark spots were turned towards us, the star appeared fainter, when the spots were turned away from us, the star appeared brighter. Today we know ...
... Several stars show periodic changes in their apparent magnitudes. This was first thought to be caused by dark spots on a rotating star’s surface: When the dark spots were turned towards us, the star appeared fainter, when the spots were turned away from us, the star appeared brighter. Today we know ...
Quasars
... Quasars are the brightest type of active galactic nucleus. The viewpoint now is that a supermassive black hole is consuming stars and gas and dust clouds in their near vacinity and creating an accretion disk of matter which is compressed and accelerated to near luminous speeds (the speed of light) a ...
... Quasars are the brightest type of active galactic nucleus. The viewpoint now is that a supermassive black hole is consuming stars and gas and dust clouds in their near vacinity and creating an accretion disk of matter which is compressed and accelerated to near luminous speeds (the speed of light) a ...
ASTR-100 - Jiri Brezina Teaching
... Tidal heating slows the bodies' rotation until it becomes tidally locked, and the tidal bulge does not change any more. Two (from many) examples of tidal heating: Moon’s rotation, originally faster than now (the Moon showed all sides earlier), has been tidally locked to the Earth since 3.5 bill. y. ...
... Tidal heating slows the bodies' rotation until it becomes tidally locked, and the tidal bulge does not change any more. Two (from many) examples of tidal heating: Moon’s rotation, originally faster than now (the Moon showed all sides earlier), has been tidally locked to the Earth since 3.5 bill. y. ...
Rotation
... envelope may also make the star more difficult to explode because of fall back. 3) Mass loss sets an upper bound to the luminosity of red supergiants. This limit is metallicity dependent. For solar metallicity, the maximum mass star that dies with a hydrogen envelope attached is about 35 solar masse ...
... envelope may also make the star more difficult to explode because of fall back. 3) Mass loss sets an upper bound to the luminosity of red supergiants. This limit is metallicity dependent. For solar metallicity, the maximum mass star that dies with a hydrogen envelope attached is about 35 solar masse ...
shirley - Yancy L. Shirley`s Webpage
... What is the relative importance of spontaneous and stimulated processes in the formation of stars of various mass? What governs the SFR in a molecular cloud? What determined the IMF evolution from molecular cloud clumps to stars? Do stars form in a process of fragmentation of an overall ...
... What is the relative importance of spontaneous and stimulated processes in the formation of stars of various mass? What governs the SFR in a molecular cloud? What determined the IMF evolution from molecular cloud clumps to stars? Do stars form in a process of fragmentation of an overall ...
astronomy advisory panel strategy
... formation and evolution of galaxies requires us to know what determines the rate of star formation, what determines any variation in the mass distribution of stars formed, and what determines the characteristics of multiple star systems. The star formation process also produces planetary systems. Th ...
... formation and evolution of galaxies requires us to know what determines the rate of star formation, what determines any variation in the mass distribution of stars formed, and what determines the characteristics of multiple star systems. The star formation process also produces planetary systems. Th ...
Ursa Major
Ursa Major /ˈɜrsə ˈmeɪdʒər/ (also known as the Great Bear and Charles' Wain) is a constellation in the northern celestial hemisphere. One of the 48 constellations listed by Ptolemy (second century AD), it remains one of the 88 modern constellations. It can be visible throughout the year in most of the northern hemisphere. Its name, Latin for ""the greater (or larger) she-bear"", stands as a reference to and in direct contrast with Ursa Minor, ""the smaller she-bear"", with which it is frequently associated in mythology and amateur astronomy. The constellation's most recognizable asterism, a group of seven relatively bright stars commonly known as the ""Big Dipper"", ""the Wagon"" or ""the Plough"" (among others), both mimicks the shape of the lesser bear (the ""Little Dipper"") and is commonly used as a navigational pointer towards the current northern pole star, Polaris in Ursa Minor. The Big Dipper and the constellation as a whole have mythological significance in numerous world cultures, usually as a symbol of the north.The third largest constellation in the sky, Ursa Major is home to many deep-sky objects including seven Messier objects, four other NGC objects and I Zwicky 18, the youngest known galaxy in the visible universe.