Measuring the Masses of Galaxies in the Sloan Digital Sky Survey
... physical properties like R, M, L can be determined once the distance is known astronomers attempt to understand the nature of galaxies (how they formed, how they evolve, what is in them), constrained by the values of these properties ...
... physical properties like R, M, L can be determined once the distance is known astronomers attempt to understand the nature of galaxies (how they formed, how they evolve, what is in them), constrained by the values of these properties ...
Stellar Evolution
... This outline of stellar formation and extinction can be compared to observations of star clusters; here a globular cluster: ...
... This outline of stellar formation and extinction can be compared to observations of star clusters; here a globular cluster: ...
Stellar Evolution – Life of a Star
... • Move the “x” along the Main Sequence. Moving from bottom right to upper left, describe the ways that the stars differ. • Change the x-axis to “Spectral Type.” What is the spectral class (O, B, A) or type of our Sun?. What is Polaris’ class? • Betelgeuse (in Orion) has a temperature of 3500oK and a ...
... • Move the “x” along the Main Sequence. Moving from bottom right to upper left, describe the ways that the stars differ. • Change the x-axis to “Spectral Type.” What is the spectral class (O, B, A) or type of our Sun?. What is Polaris’ class? • Betelgeuse (in Orion) has a temperature of 3500oK and a ...
Learning About Stars
... http://www.redorbit.com/modules/reflib/article_images/6_15cc05865f89c4801c5ff2a85d74a93c.jpg ...
... http://www.redorbit.com/modules/reflib/article_images/6_15cc05865f89c4801c5ff2a85d74a93c.jpg ...
HR4AGN Powerpoint Presentation-a
... • So we want a color magnitude diagram for AGN so that by looking at the color of an AGN we can get its luminosity – But AGN have no fusion, why would we expect a color-magnitude relation? – The gas that accretes onto the black hole is still hot and so must follow the Blackbody Radiation law. ...
... • So we want a color magnitude diagram for AGN so that by looking at the color of an AGN we can get its luminosity – But AGN have no fusion, why would we expect a color-magnitude relation? – The gas that accretes onto the black hole is still hot and so must follow the Blackbody Radiation law. ...
January SKY Newsletter 2012
... then reverse direction and wind up back in Leo by early February. This change in position illustrates the retrograde motion of Mars. January is an excellent time to view Mars through a telescope if you want to see the north polar cap and possibly some surface markings. This is also a good time to vi ...
... then reverse direction and wind up back in Leo by early February. This change in position illustrates the retrograde motion of Mars. January is an excellent time to view Mars through a telescope if you want to see the north polar cap and possibly some surface markings. This is also a good time to vi ...
Spectroscopic Investigation of Companion Stars in Herbig
... Herbig AeBe (HAEBE) binary systems are good environments for the study of pre-main sequence stellar evolution in companion stars whose mass may be significantly lower than that of the primary star. Measurements of the spectral type and surface gravity of the companion star in the system allow it to ...
... Herbig AeBe (HAEBE) binary systems are good environments for the study of pre-main sequence stellar evolution in companion stars whose mass may be significantly lower than that of the primary star. Measurements of the spectral type and surface gravity of the companion star in the system allow it to ...
AST 207 Test 1 28 September 2011
... I drew the horizon on 9/7 just before dawn. (The date must be after 8/21, the date on which the sun is in front of Leo. It must not be too much after 8/21, since the sun and Leo will not be close.) The sun is below the horizon, and Leo is just above the horizon. I know this is near sunrise because a ...
... I drew the horizon on 9/7 just before dawn. (The date must be after 8/21, the date on which the sun is in front of Leo. It must not be too much after 8/21, since the sun and Leo will not be close.) The sun is below the horizon, and Leo is just above the horizon. I know this is near sunrise because a ...
Lecture 5: Stars
... When classifying stars the star is given one of the OBAFGKM spectral classifications. Within this a number 0-9 says how hot it is, so an M0 is hotter than an M9 (the coolest type of star). The Sun is a G2 star (at the hot-end of the Gs). Roman numerals are used to distinguish sizes as determined by ...
... When classifying stars the star is given one of the OBAFGKM spectral classifications. Within this a number 0-9 says how hot it is, so an M0 is hotter than an M9 (the coolest type of star). The Sun is a G2 star (at the hot-end of the Gs). Roman numerals are used to distinguish sizes as determined by ...
Mass Segregation in Globular Clusters
... Because the light in the telescopic image of a star is spread over several adjacent pixels, we exercised extreme care and control to ensure positional accuracy. By carefully selecting the ACS filter through which the observations were made, the two target groups of stars with very different masses ...
... Because the light in the telescopic image of a star is spread over several adjacent pixels, we exercised extreme care and control to ensure positional accuracy. By carefully selecting the ACS filter through which the observations were made, the two target groups of stars with very different masses ...
Stellar Evolution - University of California, Santa Cruz
... UV photons from the hot, newly formed O stars ionize hydrogen atoms in the surrounding gas. • When electrons recombine with protons (ionized hydrogen atoms), the electrons cascade through the energy levels. A high probability step on the epath to the ground level is to drop from the 2nd excited leve ...
... UV photons from the hot, newly formed O stars ionize hydrogen atoms in the surrounding gas. • When electrons recombine with protons (ionized hydrogen atoms), the electrons cascade through the energy levels. A high probability step on the epath to the ground level is to drop from the 2nd excited leve ...
Stellar Parallax Problems
... B. The Milky Way galaxy has a diameter of about100,000 light years and we are about 28,000 light years from the center. In a sentence describe how much of the galaxy this hypothetical Gaia-copy mission could see (ignoring other factors like obscuration due to interstellar dust)? ...
... B. The Milky Way galaxy has a diameter of about100,000 light years and we are about 28,000 light years from the center. In a sentence describe how much of the galaxy this hypothetical Gaia-copy mission could see (ignoring other factors like obscuration due to interstellar dust)? ...
Masers and high mass star formation Claire Chandler
... • Massive, prestellar cold cores: Star has not formed yet, but molecular gas available (a few of these cores are known) • Massive hot cores: Star has formed already, but accretion so strong that quenches ionization => no HII region (tens are known). Jets and disks expected in standard model ...
... • Massive, prestellar cold cores: Star has not formed yet, but molecular gas available (a few of these cores are known) • Massive hot cores: Star has formed already, but accretion so strong that quenches ionization => no HII region (tens are known). Jets and disks expected in standard model ...
Galactic astronomy - Sierra College Astronomy Home Page
... Must be observed at radio, infrared, and x-rays. Sgr A* ...
... Must be observed at radio, infrared, and x-rays. Sgr A* ...
Small Wonders: Andromeda
... at Mt Wilson. Due to the wartime blackouts of Los Angeles, Baade was able to make good use of the blackest skies Mt. Wilson will probably ever see to resolve the individual stars throughout M31.Although these astronomers studied M31 with the most powerful telescopes of the time, it's visible to the ...
... at Mt Wilson. Due to the wartime blackouts of Los Angeles, Baade was able to make good use of the blackest skies Mt. Wilson will probably ever see to resolve the individual stars throughout M31.Although these astronomers studied M31 with the most powerful telescopes of the time, it's visible to the ...
Cygnus (constellation)
Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.