parallax
... experiment above. How does the parallax (the apparent shift of the position of your finger) change as your finger is moved closer to your ...
... experiment above. How does the parallax (the apparent shift of the position of your finger) change as your finger is moved closer to your ...
PARALLAX EXERCISE1 The goal of this exercise is to introduce the
... experiment above. How does the parallax (the apparent shift of the position of your finger) change as your finger is moved closer to your ...
... experiment above. How does the parallax (the apparent shift of the position of your finger) change as your finger is moved closer to your ...
printer-friendly version of benchmark
... directly observable (such as temperature and some motions), while others (such as mass) require inference from other data. Of these characteristics, the most important are color, temperature, mass, and luminosity. Although most appear white to our eyes, most stars have a predominant color that is de ...
... directly observable (such as temperature and some motions), while others (such as mass) require inference from other data. Of these characteristics, the most important are color, temperature, mass, and luminosity. Although most appear white to our eyes, most stars have a predominant color that is de ...
Determining Distances to Other Galaxies
... position angle of these ellipses vary with radius, a spiral-shaped density wave can be formed from a set of nested ovals. Density wave theory is really based on the premise that mutual gravitational attraction of stars and gas clouds at different radii can offset the spiral’s tendency to wind-up. Th ...
... position angle of these ellipses vary with radius, a spiral-shaped density wave can be formed from a set of nested ovals. Density wave theory is really based on the premise that mutual gravitational attraction of stars and gas clouds at different radii can offset the spiral’s tendency to wind-up. Th ...
Extragalactic Astrophysics 1 AA 2011-2012 Prof. LA Antonelli
... most other galaxies have velocities within ~60 km/s from MilkyWay+M31 center of mass, not enough to escape from LG: Local Group represents a typical galactic environment: less dense than a galaxy cluster like Virgo or Coma, but contains enough mass to bind the galaxies together Local Group constitut ...
... most other galaxies have velocities within ~60 km/s from MilkyWay+M31 center of mass, not enough to escape from LG: Local Group represents a typical galactic environment: less dense than a galaxy cluster like Virgo or Coma, but contains enough mass to bind the galaxies together Local Group constitut ...
PH607lec12
... galaxies, nor is there strong evidence for recent ingestion of smaller, younger galaxies. By contrast, the smaller, fainter galaxies are significantly younger -- their stars were formed as little as four billion years ago. The results of the survey contrast sharply with conventional hierarchical mod ...
... galaxies, nor is there strong evidence for recent ingestion of smaller, younger galaxies. By contrast, the smaller, fainter galaxies are significantly younger -- their stars were formed as little as four billion years ago. The results of the survey contrast sharply with conventional hierarchical mod ...
How big are stars? How do we know?
... b) relatively cool giant stars that are relatively close to the Sun. c) relatively cool main-sequence stars that are relatively far from the Sun. d) relatively cool main-sequence stars that are relatively close to the Sun. e) giant stars and relatively hot main sequence stars. ...
... b) relatively cool giant stars that are relatively close to the Sun. c) relatively cool main-sequence stars that are relatively far from the Sun. d) relatively cool main-sequence stars that are relatively close to the Sun. e) giant stars and relatively hot main sequence stars. ...
Our Local Group of Galaxies
... How complete is the list of Milky Way dSph companions? • Grey area shows region of the sky covered in Data Release 6 of the SDSS. Previously known MW satellites are marked in blue, new discoveries in red. Solid black line and middle grey stripe are at declination zero - inside is the region to be s ...
... How complete is the list of Milky Way dSph companions? • Grey area shows region of the sky covered in Data Release 6 of the SDSS. Previously known MW satellites are marked in blue, new discoveries in red. Solid black line and middle grey stripe are at declination zero - inside is the region to be s ...
Chapter 20. Galaxies
... Besides the jets, AGNS reveal themselves by their X-ray emission associated with the hot gas in the accretion disk and its vicinity and by optical emission lines coming from the heated gas in the nucleus. Furthermore, there is often optically visible light generated in the nuclear region by this bla ...
... Besides the jets, AGNS reveal themselves by their X-ray emission associated with the hot gas in the accretion disk and its vicinity and by optical emission lines coming from the heated gas in the nucleus. Furthermore, there is often optically visible light generated in the nuclear region by this bla ...
Lecture 12
... have a resolution of ~1 arcsec, might seem impossible to measure p (and thus d) to any useful precision (e.g. for 10% error in d, need p to 0.1 arcsec for nearest star, to 0.01 arcsec for a useful sample). Actually, possible to measure p to substantially better accuracy than the resolution of the te ...
... have a resolution of ~1 arcsec, might seem impossible to measure p (and thus d) to any useful precision (e.g. for 10% error in d, need p to 0.1 arcsec for nearest star, to 0.01 arcsec for a useful sample). Actually, possible to measure p to substantially better accuracy than the resolution of the te ...
The APEX Telescope Large Area Survey of the Galaxy (ATLASGAL)
... tions is shown in Galactic coordinates (l, b) in degrees, on top of an IRAS false-colour image (blue: 12 µm, green: 60 µm, red: 100 µm). The large black frame shows the 360 sq. degrees mapped to date; the smaller frames inside the larger one show the data obtained in 2007 and presented in Schuller e ...
... tions is shown in Galactic coordinates (l, b) in degrees, on top of an IRAS false-colour image (blue: 12 µm, green: 60 µm, red: 100 µm). The large black frame shows the 360 sq. degrees mapped to date; the smaller frames inside the larger one show the data obtained in 2007 and presented in Schuller e ...
Luminosity Classes
... These are called Variable Stars. The change in luminosity is due to a change in size. (Though temperature changes too.) ...
... These are called Variable Stars. The change in luminosity is due to a change in size. (Though temperature changes too.) ...
Star - Uplift Education
... They are sufficiently close to Earth and the stars are well enough separated. Sirius A, brightest star in the night sky and its companion first white dwarf star to be discovered Sirius B. ...
... They are sufficiently close to Earth and the stars are well enough separated. Sirius A, brightest star in the night sky and its companion first white dwarf star to be discovered Sirius B. ...
Stellar Characteristics and Evolution
... defined as a star whose luminosity is greater than 700 Sols) rather than Size III. However, the helium-burning shell is not very stable - this causes the star to pulsate in both size and luminosity. As time goes on these pulsations get more and more severe (stars in this stage are sometimes known as ...
... defined as a star whose luminosity is greater than 700 Sols) rather than Size III. However, the helium-burning shell is not very stable - this causes the star to pulsate in both size and luminosity. As time goes on these pulsations get more and more severe (stars in this stage are sometimes known as ...
Chapter 13
... 6. Why are the stars found inside planetary nebulae only at temperatures above 25,000 K? a. These stars are fusing hydrogen at their surface. b. These stars have at least two active layers of fusion. c. These stars have multiple concentric layers of active fusion. d. We cannot see the interior stars ...
... 6. Why are the stars found inside planetary nebulae only at temperatures above 25,000 K? a. These stars are fusing hydrogen at their surface. b. These stars have at least two active layers of fusion. c. These stars have multiple concentric layers of active fusion. d. We cannot see the interior stars ...
Stars in the night Sky - ScienceEducationatNewPaltz
... Triangle and Winter Hexagon are asterisms that include stars from several constellations. Related Note: "Asterism" derives from the Greek word for star, aster. However, in ancient astronomical texts aster was often used for a combination of stars rather than for single stars. Aster could also refer ...
... Triangle and Winter Hexagon are asterisms that include stars from several constellations. Related Note: "Asterism" derives from the Greek word for star, aster. However, in ancient astronomical texts aster was often used for a combination of stars rather than for single stars. Aster could also refer ...
society journal - Auckland Astronomical Society
... A spectacular image of a pair of colliding galaxies known as The Antennae, that is approimately 45 million light years away from Earth. Technically this image is amazing 75 hours of data to produce this image over 38 nights, and the detail in the image is something you’d almost expect from the Space ...
... A spectacular image of a pair of colliding galaxies known as The Antennae, that is approimately 45 million light years away from Earth. Technically this image is amazing 75 hours of data to produce this image over 38 nights, and the detail in the image is something you’d almost expect from the Space ...
Ecosystems, from life, to the Earth, to the Galaxy
... determined by the rate of star formation and the lifetime of the most massive stars (a few million years). This ecology must have existed, though in gradually changing form, over the life of the Galaxy. It is driven by the energy flows from the massive stars, and the material cycle through these sam ...
... determined by the rate of star formation and the lifetime of the most massive stars (a few million years). This ecology must have existed, though in gradually changing form, over the life of the Galaxy. It is driven by the energy flows from the massive stars, and the material cycle through these sam ...
Introduction to the HR Diagram
... You are probably familiar with the periodic table of the elements. The periodic table is an arrangement of all the known elements in order of increasing atomic number. The reason why the elements are arranged as they are in the periodic table is to fit them all, with their widely diverse physical an ...
... You are probably familiar with the periodic table of the elements. The periodic table is an arrangement of all the known elements in order of increasing atomic number. The reason why the elements are arranged as they are in the periodic table is to fit them all, with their widely diverse physical an ...
Star Constellations
... Ancient Babylonian astronomers created the Zodiac. The Zodiac is a circle that divides the ecliptic into twelve 30-degree zones. Each zone contains a constellation, many of them animals. Horoscopes based on these astrological signs first appeared in Ptolemaic Egypt in around 50 BC. These early peopl ...
... Ancient Babylonian astronomers created the Zodiac. The Zodiac is a circle that divides the ecliptic into twelve 30-degree zones. Each zone contains a constellation, many of them animals. Horoscopes based on these astrological signs first appeared in Ptolemaic Egypt in around 50 BC. These early peopl ...
The colour-magnitude diagram
... Different effective temperatures correspond to: • different spectral types • different colours ...
... Different effective temperatures correspond to: • different spectral types • different colours ...
http://webcache.googleusercontent.com/search?q=cache
... aspect, the native is reduced to being a door-keeper, admitting and saluting guests. [2] Ptolemy attributes a mercurial-saturnine nature to the constellation as a whole, but notes the principal star Arcturus (from Arktouros 'Bear Guard': arktos, bear + ouros, guard - from its position behind Ursa Ma ...
... aspect, the native is reduced to being a door-keeper, admitting and saluting guests. [2] Ptolemy attributes a mercurial-saturnine nature to the constellation as a whole, but notes the principal star Arcturus (from Arktouros 'Bear Guard': arktos, bear + ouros, guard - from its position behind Ursa Ma ...
Review of the Principles of Stellar Parallax and Practice Problems
... Practice Problem 3: Star 1 has an absolute magnitude of 0. How many times more luminous is star 1 compared to the Sun? Note: the absolute magnitude of the Sun is +4.8. ...
... Practice Problem 3: Star 1 has an absolute magnitude of 0. How many times more luminous is star 1 compared to the Sun? Note: the absolute magnitude of the Sun is +4.8. ...
theh – rdiagramsofyoungclust ersandtheformati on ofp
... attitudes with which the empirical evidence was looked upon. Haro has pointed out that, for a number of years, there has been some evidence that the H-R diagrams of young clusters are more complex than what it is expected from the simple contraction theory. Good examples of this are the color magnit ...
... attitudes with which the empirical evidence was looked upon. Haro has pointed out that, for a number of years, there has been some evidence that the H-R diagrams of young clusters are more complex than what it is expected from the simple contraction theory. Good examples of this are the color magnit ...
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.