HR Diagram, Star Clusters, and Stellar Evolution
... • On the MS, a star is in a hydrostatic equilibrium, and its core is sufficiently hot to fuse H into He • Now the star has two chemically distinct zones, a core of inert He surrounded by an H envelope - the core of a MS star is not sufficiently hot for He burning • When the core becomes pure He, ...
... • On the MS, a star is in a hydrostatic equilibrium, and its core is sufficiently hot to fuse H into He • Now the star has two chemically distinct zones, a core of inert He surrounded by an H envelope - the core of a MS star is not sufficiently hot for He burning • When the core becomes pure He, ...
QDSpaperFred1.tex
... total cross-sectional area of all the colonies around a solar-type star would be: $2 \pi \times10^{-4} AU^2$, or $1.4 \times 10^{19} m^2$, which is $10^5$ times the land area of Earth. The total bolometric luminosity of stellar radiation intercepted by the colonies and re-radiated ...
... total cross-sectional area of all the colonies around a solar-type star would be: $2 \pi \times10^{-4} AU^2$, or $1.4 \times 10^{19} m^2$, which is $10^5$ times the land area of Earth. The total bolometric luminosity of stellar radiation intercepted by the colonies and re-radiated ...
PARALLAX EXERCISE1 The goal of this exercise is to introduce the
... Determining distances to celestial objects is one of the most important and most difficult measurements in astronomy. Compare the Sun to another star in the sky. They look completely different, and it was once believed that they were different types of objects. In fact, the Sun was once considered a ...
... Determining distances to celestial objects is one of the most important and most difficult measurements in astronomy. Compare the Sun to another star in the sky. They look completely different, and it was once believed that they were different types of objects. In fact, the Sun was once considered a ...
parallax
... Determining distances to celestial objects is one of the most important and most difficult measurements in astronomy. Compare the Sun to another star in the sky. They look completely different, and it was once believed that they were different types of objects. In fact, the Sun was once considered a ...
... Determining distances to celestial objects is one of the most important and most difficult measurements in astronomy. Compare the Sun to another star in the sky. They look completely different, and it was once believed that they were different types of objects. In fact, the Sun was once considered a ...
The Evening Sky Map
... 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 each other in the sky; either linked by gravity so that they orbit each other (binary star) or lying at different distances f ...
... 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 each other in the sky; either linked by gravity so that they orbit each other (binary star) or lying at different distances f ...
Galaxies and the Universe
... A. Star X is four times farther away than star Y. B. Star X is twice as far away as star Y. C. Star X is the same distance away as star Y. D. Star X is half as far away as star Y. E. Star X is one-fourth as far away as star Y. ...
... A. Star X is four times farther away than star Y. B. Star X is twice as far away as star Y. C. Star X is the same distance away as star Y. D. Star X is half as far away as star Y. E. Star X is one-fourth as far away as star Y. ...
Our Galaxy, the Milky Way Galaxy
... We do not know where the black holes came from Black holes do not hold galaxies together and are light compared to the rest of the galaxy ...
... We do not know where the black holes came from Black holes do not hold galaxies together and are light compared to the rest of the galaxy ...
Lecture 1
... position of Star A as seen in July and label it “Star A July”. Describe how Star A would appear to move among the distant stars as Earth orbits the Sun counterclockwise from January of one year, through July, to January of the following year. Consider two stars (C and D) that both exhibit parallax. ...
... position of Star A as seen in July and label it “Star A July”. Describe how Star A would appear to move among the distant stars as Earth orbits the Sun counterclockwise from January of one year, through July, to January of the following year. Consider two stars (C and D) that both exhibit parallax. ...
Evolution of low
... the RGB. Now, the energy generation is much more erratic. The triple-alpha process rate scales with T30(!). AGB stars undergo `Shell flashes’. ...
... the RGB. Now, the energy generation is much more erratic. The triple-alpha process rate scales with T30(!). AGB stars undergo `Shell flashes’. ...
Chapter 19. Mapping the Universe from Herschel to Sloan
... he took into account that stars have different absolute magnitudes. He had to obtain the spectral type of each star mapped and use that to determine its absolute magnitude. Again, he neglected interstellar extinction – a fact which led to serious errors in his map. Both Herschel and Kapteyn got the ...
... he took into account that stars have different absolute magnitudes. He had to obtain the spectral type of each star mapped and use that to determine its absolute magnitude. Again, he neglected interstellar extinction – a fact which led to serious errors in his map. Both Herschel and Kapteyn got the ...
Interstellar medium, birth and life of stars
... RR Lyrae variables are low-mass, pulsating variables with short periods. Cepheid variables are high-mass, pulsating variables exhibiting a regular relationship between the period of pulsation and luminosity. Mass can be transferred from one star to another in close binary systems. When this occu ...
... RR Lyrae variables are low-mass, pulsating variables with short periods. Cepheid variables are high-mass, pulsating variables exhibiting a regular relationship between the period of pulsation and luminosity. Mass can be transferred from one star to another in close binary systems. When this occu ...
Cassiopeia (constellation)
Cassiopeia is a constellation in the northern sky, named after the vain queen Cassiopeia in Greek mythology, who boasted about her unrivalled beauty. Cassiopeia was one of the 48 constellations listed by the 2nd-century Greek astronomer Ptolemy, and it remains one of the 88 modern constellations today. It is easily recognizable due to its distinctive 'M' shape when in upper culmination but in higher northern locations when near lower culminations in spring and summer it has a 'W' shape, formed by five bright stars. It is bordered by Andromeda to the south, Perseus to the southeast, and Cepheus to the north. It is opposite the Big Dipper.In northern locations above 34ºN latitude it is visible year-round and in the (sub)tropics it can be seen at its clearest from September to early November in its characteristic 'M' shape. Even in low southern latitudes below 25ºS is can be seen low in the North.