Lesson 4. Wiens and Stefans Laws
... 1. The peak intensity of thermal radiation from the Sun is at a wavelength of 500 nm, calculate the surface temperature of the Sun. 2. A star has a power output of 6.0 x 1028 W and a surface temperature of 3400K, calculate its radius and the ratio to the Sun’s radius (rsun = 7 x 108 m) ...
... 1. The peak intensity of thermal radiation from the Sun is at a wavelength of 500 nm, calculate the surface temperature of the Sun. 2. A star has a power output of 6.0 x 1028 W and a surface temperature of 3400K, calculate its radius and the ratio to the Sun’s radius (rsun = 7 x 108 m) ...
AST1100 Lecture Notes
... For instance a special kind of galaxy which has been shown to always have the same dimensions could be used as a standard ruler. ...
... For instance a special kind of galaxy which has been shown to always have the same dimensions could be used as a standard ruler. ...
AST1100 Lecture Notes
... For instance a special kind of galaxy which has been shown to always have the same dimensions could be used as a standard ruler. ...
... For instance a special kind of galaxy which has been shown to always have the same dimensions could be used as a standard ruler. ...
Standing in Awe - Auckland Astronomical Society
... Just 1.8° further to the south-west lies NGC 5861, a faint, large glow with an SB of around 13. A supernova, 1971D, was discovered within this spiral galaxy on February 24 1971, shining faintly at magnitude 15.5. A few fainter galaxies lie around 5861, needing larger telescopes to see. North-east of ...
... Just 1.8° further to the south-west lies NGC 5861, a faint, large glow with an SB of around 13. A supernova, 1971D, was discovered within this spiral galaxy on February 24 1971, shining faintly at magnitude 15.5. A few fainter galaxies lie around 5861, needing larger telescopes to see. North-east of ...
Small Wonders: Cygnus
... parents and raised by a swan, Cycnus was eventually turned into one by Poseidon after he was killed by Achilles. (Do these ancient Greek / Roman myths remind anyone else of today’s soap operas?) In any case, the bird form is not much of a stretch, and has in fact been seen as one avian or another fr ...
... parents and raised by a swan, Cycnus was eventually turned into one by Poseidon after he was killed by Achilles. (Do these ancient Greek / Roman myths remind anyone else of today’s soap operas?) In any case, the bird form is not much of a stretch, and has in fact been seen as one avian or another fr ...
HR Diagram - TeacherWeb
... A. Which star group does Proxima Centauri belong to? _________________________ B. On the H-R diagram, which star would Proxima Centauri be near? ______________ 8. Describe: Locate the Sun on the H-R diagram. How will the Sun’s luminosity and temperature change as it ages? How will these changes affe ...
... A. Which star group does Proxima Centauri belong to? _________________________ B. On the H-R diagram, which star would Proxima Centauri be near? ______________ 8. Describe: Locate the Sun on the H-R diagram. How will the Sun’s luminosity and temperature change as it ages? How will these changes affe ...
OUR SOLAR SYSTEM
... NASA’s Juno orbiter, scheduled to arrive at Jupiter in July 2016, will measure the planet’s gravitational field with sufficient accuracy to determine if a core exists. A pair of slightly different giants lies farther out. Uranus, located at 19 AU, and Neptune, at 30 AU, have smaller hydrogen atmosph ...
... NASA’s Juno orbiter, scheduled to arrive at Jupiter in July 2016, will measure the planet’s gravitational field with sufficient accuracy to determine if a core exists. A pair of slightly different giants lies farther out. Uranus, located at 19 AU, and Neptune, at 30 AU, have smaller hydrogen atmosph ...
Project 3. Colour in Astronomy
... where Fx is the observed flux in the band x, and F vega is the flux of the star Vega. The star Vega, in the constellation of Lyra is used as a reference in the magnitude system. Vega has the arbitrary definition of zero magnitude at all wavelengths U=B=V=R=I=0 This does not mean that Vega show the s ...
... where Fx is the observed flux in the band x, and F vega is the flux of the star Vega. The star Vega, in the constellation of Lyra is used as a reference in the magnitude system. Vega has the arbitrary definition of zero magnitude at all wavelengths U=B=V=R=I=0 This does not mean that Vega show the s ...
Astronomy Activity: The Life-Line of the Stars
... The brightness that a star has as seen from the Earth is called the apparent brightness . Stars which are very bright are called magnitude 1 stars . The next brightest are magnitude 2 stars. Then comes magnitude 3, 4, 5, and down to the very faintest stars visible with the naked eye, magnitude 6 sta ...
... The brightness that a star has as seen from the Earth is called the apparent brightness . Stars which are very bright are called magnitude 1 stars . The next brightest are magnitude 2 stars. Then comes magnitude 3, 4, 5, and down to the very faintest stars visible with the naked eye, magnitude 6 sta ...
Measuring Stars` Properties - Test 1 Study Guide
... • For a few close, big stars, they can be seen in a telescope as non-point objects • Measure angular size; if know distance then get size of star Example: Betelgeuse 300 times larger radius than the Sun • If further away but a binary star, get size of stars when they eclipse each other ! length o ...
... • For a few close, big stars, they can be seen in a telescope as non-point objects • Measure angular size; if know distance then get size of star Example: Betelgeuse 300 times larger radius than the Sun • If further away but a binary star, get size of stars when they eclipse each other ! length o ...
Slide 1
... arXiv:1106.3131 Denis A. Leahy, Sharon M. Morsink and Yi Chou The accreting millisecond pulsar XTE J1807-294 is studied through a pulse-shape modeling analysis. The model includes blackbody and Comptonized emission from the one visible hot spot and makes use of the Oblate Schwarzschild approximation ...
... arXiv:1106.3131 Denis A. Leahy, Sharon M. Morsink and Yi Chou The accreting millisecond pulsar XTE J1807-294 is studied through a pulse-shape modeling analysis. The model includes blackbody and Comptonized emission from the one visible hot spot and makes use of the Oblate Schwarzschild approximation ...
Magnitudes and Colours of Stars - Lincoln
... Let’s leave brightness for now, and start thinking about stellar size: another important property for classifying stars. It is almost impossible to actually see a star through a telescope and measure its physical diameter. We can do this with objects within the Solar System, but the stars are simply ...
... Let’s leave brightness for now, and start thinking about stellar size: another important property for classifying stars. It is almost impossible to actually see a star through a telescope and measure its physical diameter. We can do this with objects within the Solar System, but the stars are simply ...
What is a star?
... What is a star? • Stars have different sizes, ranging from 1/100 the size of the sun to 1,000 times the size of the sun. • Two or more stars may be bound together by gravity, which causes them to orbit each other. • Three or more stars that are bound by gravity are called multiple stars or multiple ...
... What is a star? • Stars have different sizes, ranging from 1/100 the size of the sun to 1,000 times the size of the sun. • Two or more stars may be bound together by gravity, which causes them to orbit each other. • Three or more stars that are bound by gravity are called multiple stars or multiple ...
ph507lecnote06
... Because stellar colours and spectral types are roughly correlated, we may construct a plot of absolute magnitude versus colour - called a colour-magnitude diagram. The relative ease and convenience with which colour indices (such as B - V) may be determined for vast numbers of stars dictates the pop ...
... Because stellar colours and spectral types are roughly correlated, we may construct a plot of absolute magnitude versus colour - called a colour-magnitude diagram. The relative ease and convenience with which colour indices (such as B - V) may be determined for vast numbers of stars dictates the pop ...
01 - University of Warwick
... Why is 2003 EL61 spinning fast, shaped like a football, Here is an image of the satellite from the night of 30 June made out of ice-covered rock, and surrounded by tiny satel2005. 2003 EL 61 is the bright object in the center and the lites? satellite appears directly below about 0.5 arcseconds. To t ...
... Why is 2003 EL61 spinning fast, shaped like a football, Here is an image of the satellite from the night of 30 June made out of ice-covered rock, and surrounded by tiny satel2005. 2003 EL 61 is the bright object in the center and the lites? satellite appears directly below about 0.5 arcseconds. To t ...
Ch17_Galaxies
... • Some galaxies are spiral like the Milky Way while others are egg-shaped or completely irregular in appearance • Besides shape, galaxies vary greatly in the star, gas, and dust content and some are more “active” than others • Galaxies tend to cluster together and these clusters appear to be separat ...
... • Some galaxies are spiral like the Milky Way while others are egg-shaped or completely irregular in appearance • Besides shape, galaxies vary greatly in the star, gas, and dust content and some are more “active” than others • Galaxies tend to cluster together and these clusters appear to be separat ...
Practice Exam for 3 rd Astronomy Exam
... OB Association In the Milky Way Galaxy there are very many Giant Molecular Clouds (GMC). A typical GMC contains most hydrogen and helium gas and microscopic solid particles of ice and rocky material known collectively as “dust”. The typical GMC may be 300 ly in diameter and encompass 300,000 solar m ...
... OB Association In the Milky Way Galaxy there are very many Giant Molecular Clouds (GMC). A typical GMC contains most hydrogen and helium gas and microscopic solid particles of ice and rocky material known collectively as “dust”. The typical GMC may be 300 ly in diameter and encompass 300,000 solar m ...
Investigating Supernova Remnants - Chandra X
... quantum mechanics. Two electrons with the same “spin” are not allowed to occupy the same energy state. Since there are only two ways an electron can spin, only two electrons can occupy any single energy state; this is called the Pauli Exclusion Principle. In a normal gas, this is not a problem – the ...
... quantum mechanics. Two electrons with the same “spin” are not allowed to occupy the same energy state. Since there are only two ways an electron can spin, only two electrons can occupy any single energy state; this is called the Pauli Exclusion Principle. In a normal gas, this is not a problem – the ...
Lecture7
... helium fusion begins in the core •This process, also called the triple alpha process, converts helium to carbon ...
... helium fusion begins in the core •This process, also called the triple alpha process, converts helium to carbon ...
galaxies and stars
... 44. Which process was occurring during some of these stages that resulted in the formation of heavier elements from lighter elements? A conduction C radioactive decay ...
... 44. Which process was occurring during some of these stages that resulted in the formation of heavier elements from lighter elements? A conduction C radioactive decay ...
ppt
... • Every output class needs substantial representation in the training set. • Overlap between classes should be minimized. • Classifier accuracy can be improved with additional information (i.e., flux in different bandpass), but not always! ...
... • Every output class needs substantial representation in the training set. • Overlap between classes should be minimized. • Classifier accuracy can be improved with additional information (i.e., flux in different bandpass), but not always! ...
Stellar population models in the Near-Infrared Meneses
... els, with slopes of −3.0 and −3.5) and a model that follows the IMF recipe of Chabrier with parameter χ = −1.3. The different initial mass function tests presented there give us insights into the complex star formation scenario that these early-type galaxies present. In future work, we will need to ...
... els, with slopes of −3.0 and −3.5) and a model that follows the IMF recipe of Chabrier with parameter χ = −1.3. The different initial mass function tests presented there give us insights into the complex star formation scenario that these early-type galaxies present. In future work, we will need to ...
Physics of Star Formation: Milky Way and Beyond
... Virial equilibrium, implying in the collective imagination of astronomers that turbulence provides support to molecular clouds against collapse. Moreover, the origin of MC turbulence is still not properly understood, since it appears to be homogeneous and ubiquitous along the galaxy, while the sourc ...
... Virial equilibrium, implying in the collective imagination of astronomers that turbulence provides support to molecular clouds against collapse. Moreover, the origin of MC turbulence is still not properly understood, since it appears to be homogeneous and ubiquitous along the galaxy, while the sourc ...
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.