Additional Cosmology Images
... The sky is a jewelry box full of sparkling stars in these infrared images. The crown jewels are 14 massive stars on the verge of exploding as supernovae. These hefty stars reside in one of the most massive star clusters in the Milky Way. The bluish cluster is inside the white box in the large image ...
... The sky is a jewelry box full of sparkling stars in these infrared images. The crown jewels are 14 massive stars on the verge of exploding as supernovae. These hefty stars reside in one of the most massive star clusters in the Milky Way. The bluish cluster is inside the white box in the large image ...
Order-of-Magnitude Astrophysics
... steady hydrogen fusion) follows a track of approximately constant surface temperature T in an HR diagram. Taking this surface temperature as given, derive a formula for the luminosity of a brown dwarf as a function of mass and time. When necessary, you can assume that deuterium will be fused to heli ...
... steady hydrogen fusion) follows a track of approximately constant surface temperature T in an HR diagram. Taking this surface temperature as given, derive a formula for the luminosity of a brown dwarf as a function of mass and time. When necessary, you can assume that deuterium will be fused to heli ...
ACTIVE GALAXIES
... protogalactic clouds that were able to cool and form stars before gas settled into a disk Elliptical vs. Spiral Galaxy Formation ...
... protogalactic clouds that were able to cool and form stars before gas settled into a disk Elliptical vs. Spiral Galaxy Formation ...
Here - Amateur Observers` Society of New York
... the earth, the moon is closely enough aligned to hide at least part of the sun, as viewed from the earth. A lunar eclipse occurs when, on passing between the sun and the moon, the earth is closely enough aligned to hide at least some of the moon. For both solar and lunar eclipses, use the prediction ...
... the earth, the moon is closely enough aligned to hide at least part of the sun, as viewed from the earth. A lunar eclipse occurs when, on passing between the sun and the moon, the earth is closely enough aligned to hide at least some of the moon. For both solar and lunar eclipses, use the prediction ...
Stars
... fuse together inside a star, helium is produced. Heavier elements are produced when a star becomes a red giant. Only a supernova can produce elements heavier than iron, such as silver, gold and uranium. ...
... fuse together inside a star, helium is produced. Heavier elements are produced when a star becomes a red giant. Only a supernova can produce elements heavier than iron, such as silver, gold and uranium. ...
MSci Astrophysics 210PHY412 - Queen's University Belfast
... star if it were placed at a distance of 10 pc m – M = 5 log(d/10) - 5 where d is in pc (note: log10 ) • Magnitudes are measured in some wavelength band e.g. UBV. To compare with theory it is more useful to determine bolometric magnitude – defined as absolute magnitude that would be measured by a bol ...
... star if it were placed at a distance of 10 pc m – M = 5 log(d/10) - 5 where d is in pc (note: log10 ) • Magnitudes are measured in some wavelength band e.g. UBV. To compare with theory it is more useful to determine bolometric magnitude – defined as absolute magnitude that would be measured by a bol ...
Astronomy 103
... They were known as the Harvard Computers and developed the classification system used for stars today (while being paid less than the secretaries at the university). ...
... They were known as the Harvard Computers and developed the classification system used for stars today (while being paid less than the secretaries at the university). ...
Section9 - University of Chicago
... Once the first stars and galaxies form we are basically in territory for which there is good observational data. We now have observed many galaxies to about z~4 and can trace how those objects evolve down to lower redshifts. In fact the evolution of galaxy populations is itself another piece of evid ...
... Once the first stars and galaxies form we are basically in territory for which there is good observational data. We now have observed many galaxies to about z~4 and can trace how those objects evolve down to lower redshifts. In fact the evolution of galaxy populations is itself another piece of evid ...
Summary: Modes of Star Formation
... provides another record of the way in which stars form. Like stellar masses, the properties of binaries are largely preserved from their time of formation, and this allows binary statistics to be used to infer something about the typical sites of star formation. The field population contains a mix o ...
... provides another record of the way in which stars form. Like stellar masses, the properties of binaries are largely preserved from their time of formation, and this allows binary statistics to be used to infer something about the typical sites of star formation. The field population contains a mix o ...
12-1 MAIN-SEQUENCE STARS
... support and can fuse nearly all of their hydrogen fuel, they will remain on the main sequence for many times the present age of the universe. Medium-mass stars between about 0.4 and 4 solar masses, including the sun, become cool giants and fuse helium but cannot fuse carbon. Medium-mass stars lose m ...
... support and can fuse nearly all of their hydrogen fuel, they will remain on the main sequence for many times the present age of the universe. Medium-mass stars between about 0.4 and 4 solar masses, including the sun, become cool giants and fuse helium but cannot fuse carbon. Medium-mass stars lose m ...
Elliptical galaxies
... •We understand why stars occupy certain regions of the color-magnitude diagram: •the luminosity and temperature are controlled by the star's mass •the nuclear processes occurring inside the stars. ...
... •We understand why stars occupy certain regions of the color-magnitude diagram: •the luminosity and temperature are controlled by the star's mass •the nuclear processes occurring inside the stars. ...
Project 4: The HR diagram. Open clusters
... or spectral class, while the vertical axis can be luminosity with respect to that of the Sun or the absolute magnitude MV. When luminosity is plotted as a function of the temperature for a large number of stars, stars do not fall randomly on the graph; rather they are confined to specific regions. T ...
... or spectral class, while the vertical axis can be luminosity with respect to that of the Sun or the absolute magnitude MV. When luminosity is plotted as a function of the temperature for a large number of stars, stars do not fall randomly on the graph; rather they are confined to specific regions. T ...
QDSpaperFred1.tex
... We have attempted to exclude degenerate stars (e.g. white dwarfs and other high-density stars with eq. 4. Eq. 5 eliminates most normal and all giant stars. Eq. 3 eliminates hot stars, even on the main sequence, because we do not expect them to live long enough for intelligest life to develop. Eq. 1 ...
... We have attempted to exclude degenerate stars (e.g. white dwarfs and other high-density stars with eq. 4. Eq. 5 eliminates most normal and all giant stars. Eq. 3 eliminates hot stars, even on the main sequence, because we do not expect them to live long enough for intelligest life to develop. Eq. 1 ...
young science communicator`s competition
... SHAPLEY: Well, we all know that the familiar band of stars across the sky which we call the Milky Way is in fact a disk shaped galaxy, filled with millions of stars, of which our sun is one. I propose that the Milky Way is ten times larger than previously thought [gasp from the audience] and as such ...
... SHAPLEY: Well, we all know that the familiar band of stars across the sky which we call the Milky Way is in fact a disk shaped galaxy, filled with millions of stars, of which our sun is one. I propose that the Milky Way is ten times larger than previously thought [gasp from the audience] and as such ...
January 2015 - Newbury Astronomical Society
... computed using a statistical technique based on proper motion and velocities of its stars. The mass within the central part has been found to be between 1600 and 3200 solar masses. It does need a telescope to see well. ...
... computed using a statistical technique based on proper motion and velocities of its stars. The mass within the central part has been found to be between 1600 and 3200 solar masses. It does need a telescope to see well. ...
Chapter 17 Measuring the Stars
... star in the sky, after correcting for parallax These pictures were taken 22 years apart ...
... star in the sky, after correcting for parallax These pictures were taken 22 years apart ...
Stars: from Adolescence to Old Age
... Stage 7: Red Giant or Supergiant • When core fuel runs out again, the core resumes its collapse • If the star is massive ...
... Stage 7: Red Giant or Supergiant • When core fuel runs out again, the core resumes its collapse • If the star is massive ...
The Milky Way - Houston Community College System
... parallax, nearby stars also show continuous motions across the sky. ...
... parallax, nearby stars also show continuous motions across the sky. ...
Notes - Bill Wolf
... brightness with a number scale. The first group of stars to become visible at night were called magnitude one, the next group to become visible were the magnitude two stars, and so on up to magnitude 6. It’s obvious here to note that stars with lower magnitude are actually the brighter stars. Later, ...
... brightness with a number scale. The first group of stars to become visible at night were called magnitude one, the next group to become visible were the magnitude two stars, and so on up to magnitude 6. It’s obvious here to note that stars with lower magnitude are actually the brighter stars. Later, ...
The Temperature of Stars
... Stars vary in size and mass. Stars such as the sun are considered medium-sized stars. The sun has a diameter of 1,390,000 km. Most stars visible from Earth are mediumsized stars. Many stars also have about the same mass as the sun, however some stars may be more or less massive. ...
... Stars vary in size and mass. Stars such as the sun are considered medium-sized stars. The sun has a diameter of 1,390,000 km. Most stars visible from Earth are mediumsized stars. Many stars also have about the same mass as the sun, however some stars may be more or less massive. ...
Good Vibrations and Stellar Pulsations - Physics
... to the Small Magellanic Cloud was 33,000 light years. This was the greatest distance ever determined for an astronomical object. In 1917, Harlow Shapley used Hertzsprung’s calibration of the period-luminosity relation to determine the distance to the globular clusters (some of which contain Cepheids ...
... to the Small Magellanic Cloud was 33,000 light years. This was the greatest distance ever determined for an astronomical object. In 1917, Harlow Shapley used Hertzsprung’s calibration of the period-luminosity relation to determine the distance to the globular clusters (some of which contain Cepheids ...
1. This question is about some of the properties of Barnard`s star
... Star A has an apparent magnitude of 5.0 and is 100 pc from Earth. The luminosity of star A is 4.0 times the luminosity of star B. The apparent brightness of star A is 100 times greater than the apparent brightness of star B. ...
... Star A has an apparent magnitude of 5.0 and is 100 pc from Earth. The luminosity of star A is 4.0 times the luminosity of star B. The apparent brightness of star A is 100 times greater than the apparent brightness of star B. ...
Chapter10 (with interactive links)
... us in the sky. This generally a number between 0 (very bright) and 6 (faintest human eye can see in a dark sky). A difference in magnitude of 1 is a factor in brightness of 2.5. Venus can have a negative apparent magnitude! ...
... us in the sky. This generally a number between 0 (very bright) and 6 (faintest human eye can see in a dark sky). A difference in magnitude of 1 is a factor in brightness of 2.5. Venus can have a negative apparent magnitude! ...
The cosmic distance scale
... The rotational velocity of a spiral galaxy can be measured from the HI integrated spectrum. The HI gas in a spiral follows very closely circular orbits at a speed Vc . If the galaxy is inclined at an angle i to the line of sight, the observed line of sight velocity will vary from + Vc sin i to - Vc ...
... The rotational velocity of a spiral galaxy can be measured from the HI integrated spectrum. The HI gas in a spiral follows very closely circular orbits at a speed Vc . If the galaxy is inclined at an angle i to the line of sight, the observed line of sight velocity will vary from + Vc sin i to - Vc ...
Serpens
Serpens (""the Serpent"", Greek Ὄφις) is a constellation of the northern hemisphere. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations defined by the International Astronomical Union. It is unique among the modern constellations in being split into two non-contiguous parts, Serpens Caput (Serpent's Head) to the west and Serpens Cauda (Serpent's Tail) to the east. Between these two halves lies the constellation of Ophiuchus, the ""Serpent-Bearer"". In figurative representations, the body of the serpent is represented as passing behind Ophiuchus between Mu Serpentis in Serpens Caput and Nu Serpentis in Serpens Cauda.The brightest star in Serpens is the red giant star Alpha Serpentis, or Unukalhai, in Serpens Caput, with an apparent magnitude of 2.63. Also located in Serpens Caput are the naked-eye globular cluster Messier 5 and the naked-eye variables R Serpentis and Tau4 Serpentis. Notable extragalactic objects include Seyfert's Sextet, one of the densest galaxy clusters known; Arp 220, the prototypical ultraluminous infrared galaxy; and Hoag's Object, the most famous of the very rare class of galaxies known as ring galaxies.Part of the Milky Way's galactic plane passes through Serpens Cauda, which is therefore rich in galactic deep-sky objects, such as the Eagle Nebula (IC 4703) and its associated star cluster Messier 16. The nebula measures 70 light-years by 50 light-years and contains the Pillars of Creation, three dust clouds that became famous for the image taken by the Hubble Space Telescope. Other striking objects include the Red Square Nebula, one of the few objects in astronomy to take on a square shape; and Westerhout 40, a massive nearby star-forming region consisting of a molecular cloud and an H II region.