talk.wyse - Johns Hopkins University
... high velocity dispersion – plausibly star cluster of Sgr dSph Available metallicity distribution based on four stars: two radial-velocity members at ~ 0.01 solar (Norris, RW et al. 2010), equal to that of the field halo, and of Sgr debris, two others very metalpoor, at 0.0003 solar ([Fe/H] ~ -3.5) ...
... high velocity dispersion – plausibly star cluster of Sgr dSph Available metallicity distribution based on four stars: two radial-velocity members at ~ 0.01 solar (Norris, RW et al. 2010), equal to that of the field halo, and of Sgr debris, two others very metalpoor, at 0.0003 solar ([Fe/H] ~ -3.5) ...
Microsoft Word 97
... 7) In the directions in which we see the Milky Way in the sky, we are looking through the relatively thin, pancake-like disk of matter that forms a major part of our Milky Way Galaxy. a) This disk is about 90,000 light years across, an enormous, gravitationally bound system of stars. b) The Milky Wa ...
... 7) In the directions in which we see the Milky Way in the sky, we are looking through the relatively thin, pancake-like disk of matter that forms a major part of our Milky Way Galaxy. a) This disk is about 90,000 light years across, an enormous, gravitationally bound system of stars. b) The Milky Wa ...
Star Formation in the Galaxy, An Observational Overview
... 25% of dense cores in dark clouds contain embedded stars or protostars (Lee & Myers 1999). The highest efficiencies appear to be achieved in the most massive cores which produce embedded clusters (e.g., Lada 1992). 3.2. Embedded Clusters in Molecular Clouds Given that stars form in dense gas, it is ...
... 25% of dense cores in dark clouds contain embedded stars or protostars (Lee & Myers 1999). The highest efficiencies appear to be achieved in the most massive cores which produce embedded clusters (e.g., Lada 1992). 3.2. Embedded Clusters in Molecular Clouds Given that stars form in dense gas, it is ...
Activities
... continuous cycle in the number of sunspots, which are the most visible tracer of the magnetic fields that cause all forms of solar activity. The solar cycle seems to be linked to changes in the Sun’s global magnetic field. At one solar activity maximum, the magnetic field is aligned so that a compas ...
... continuous cycle in the number of sunspots, which are the most visible tracer of the magnetic fields that cause all forms of solar activity. The solar cycle seems to be linked to changes in the Sun’s global magnetic field. At one solar activity maximum, the magnetic field is aligned so that a compas ...
Document
... Solar bisectors take on a „C“ shape due to more flux and more area of rising part of convective cells. There is considerable variations with limb angle due to the change of depth of formation and the view angle. The line profiles themselves become shallower and wider towards the limb. ...
... Solar bisectors take on a „C“ shape due to more flux and more area of rising part of convective cells. There is considerable variations with limb angle due to the change of depth of formation and the view angle. The line profiles themselves become shallower and wider towards the limb. ...
Lecture 12
... The relationship between redshift and distance is linear for low values of z, but becomes rather complex when we look at very distant objects (very far back in time). As the Universe expands the value of H0 changes as the geometry of the Universe changes. Partly this is a ‘standard’ result from appl ...
... The relationship between redshift and distance is linear for low values of z, but becomes rather complex when we look at very distant objects (very far back in time). As the Universe expands the value of H0 changes as the geometry of the Universe changes. Partly this is a ‘standard’ result from appl ...
Candidate star clusters toward the inner Milky Way discovered on
... The final list of identified cluster candidates contains nine objects. Their locations on the sky are shown in Fig. 4 and there appears to be some clustering: VVV CC 169 and VVV CC 170 have projected on-sky separation of ∼2 arcmin, but these objects have different extinctions and distances (Table 1) ...
... The final list of identified cluster candidates contains nine objects. Their locations on the sky are shown in Fig. 4 and there appears to be some clustering: VVV CC 169 and VVV CC 170 have projected on-sky separation of ∼2 arcmin, but these objects have different extinctions and distances (Table 1) ...
Stars and Galaxies
... has about 200 billion stars, and lots of gas and dust is a barred-spiral (we think) about 100,000 light-years wide our Sun is halfway to the edge, revolving at half a million miles per hour around the center of the Galaxy takes our Solar System about 200 million years to revolve once around our ...
... has about 200 billion stars, and lots of gas and dust is a barred-spiral (we think) about 100,000 light-years wide our Sun is halfway to the edge, revolving at half a million miles per hour around the center of the Galaxy takes our Solar System about 200 million years to revolve once around our ...
Spagna
... the Chamaleleon SFR Note that the Chamaeleon SFR is not far from several other SFRs, OB associations and young cluster, such as the Upper Scorpius, Lupus, Low Centaurus Crux, etc, which are correlated to the Gould Belt, the asymmetric structure in the galactic plane including both a stellar componen ...
... the Chamaleleon SFR Note that the Chamaeleon SFR is not far from several other SFRs, OB associations and young cluster, such as the Upper Scorpius, Lupus, Low Centaurus Crux, etc, which are correlated to the Gould Belt, the asymmetric structure in the galactic plane including both a stellar componen ...
Continuous Spectrum—Kirchoff`s First Law
... If we know the temperature of a main sequence star, we can estimate its absolute luminosity. Then a measurement of its apparent luminosity gives us the distance to the star ...
... If we know the temperature of a main sequence star, we can estimate its absolute luminosity. Then a measurement of its apparent luminosity gives us the distance to the star ...
Astronomy 112: The Physics of Stars Class 16 Notes: Post
... After a short period the luminosity stabilizes, and since Lnuc < L, the star responds by having its envelope contract. That contraction leaves the luminosity unchanged, but moves the star to higher effective temperature. The motion is roughly horizontal in the HR diagram, so this is known as the hor ...
... After a short period the luminosity stabilizes, and since Lnuc < L, the star responds by having its envelope contract. That contraction leaves the luminosity unchanged, but moves the star to higher effective temperature. The motion is roughly horizontal in the HR diagram, so this is known as the hor ...
AN OPTICAL INFRARED ASTROMETRIC - Cosmos
... in diameter we set multi-color photometry array detectors to get precise wide-band and/or intermediateband spectroscopic information of the observed stars. With the baseline B = 1 m the width of a stellar fringe in V-band is 0.11 arcsec at = 550 nm. One fringe width should be covered by at least f ...
... in diameter we set multi-color photometry array detectors to get precise wide-band and/or intermediateband spectroscopic information of the observed stars. With the baseline B = 1 m the width of a stellar fringe in V-band is 0.11 arcsec at = 550 nm. One fringe width should be covered by at least f ...
Astronomy 114 - Department of Astronomy
... Magnitude scale Greek astronomer Hipparchus divided stars into six classes or magnitudes (2nd century BC) 1st magnitude is brightest, 6th magnitude is faintest Sensitivity of human eye is logarithmic Magnitude difference of 1 corresponds log(1000) 3 to −2.5 log(F1 /F2 ) ...
... Magnitude scale Greek astronomer Hipparchus divided stars into six classes or magnitudes (2nd century BC) 1st magnitude is brightest, 6th magnitude is faintest Sensitivity of human eye is logarithmic Magnitude difference of 1 corresponds log(1000) 3 to −2.5 log(F1 /F2 ) ...
First Light for May, 2001 - South Bay Astronomical Society
... The transit method can only find systems that are aligned with our line of sight. The Stellar Wobble Method can find planetary systems that are not fully aligned with our line of sight but still have a component that provides a relative motion towards or away from Earth. Thus, the Wobble method pro ...
... The transit method can only find systems that are aligned with our line of sight. The Stellar Wobble Method can find planetary systems that are not fully aligned with our line of sight but still have a component that provides a relative motion towards or away from Earth. Thus, the Wobble method pro ...
Earth in Space - Learning Outcomes
... The gravitational attraction of the Earth is what is responsible for the moon's circular motion round the Earth. Thus the observed central acceleration can be calculated from measurements of ...
... The gravitational attraction of the Earth is what is responsible for the moon's circular motion round the Earth. Thus the observed central acceleration can be calculated from measurements of ...
Milky Way Galaxy
... The Universe is filled with these star systems which themselves cluster together into larger systems. ...
... The Universe is filled with these star systems which themselves cluster together into larger systems. ...
WELCOME TO THE MILKY WAY
... Egyptians more than 3,000 years ago announced the annual flood of the Nile. The Egyptians believed that Sirius was responsible for the flooding. Today we know that the rainy season causes the swelling of the Nile. So, in short, the equinoxes indicate the cross sections of the ecliptic with the celes ...
... Egyptians more than 3,000 years ago announced the annual flood of the Nile. The Egyptians believed that Sirius was responsible for the flooding. Today we know that the rainy season causes the swelling of the Nile. So, in short, the equinoxes indicate the cross sections of the ecliptic with the celes ...
aaswinter07ppt
... In January 2002, the star V838 Monocerotis erupted, generating intense interest, at least partly because of the exquisite pictures taken by the Hubble Space Telescope (see the background of this poster and the color picture below) ACS showing what is interpreted as a “light echo” from the eruption ( ...
... In January 2002, the star V838 Monocerotis erupted, generating intense interest, at least partly because of the exquisite pictures taken by the Hubble Space Telescope (see the background of this poster and the color picture below) ACS showing what is interpreted as a “light echo” from the eruption ( ...
chapter18StarDeath
... — Use orbital properties of companion — Measure velocity and distance of orbiting gas It’s a black hole if it’s not a star and its mass exceeds the neutron star limit (~3 MSun) ...
... — Use orbital properties of companion — Measure velocity and distance of orbiting gas It’s a black hole if it’s not a star and its mass exceeds the neutron star limit (~3 MSun) ...
Chapter 18 The Bizarre Stellar Graveyard What is a white dwarf
... – A black hole is a massive object whose radius is so small that the escape velocity exceeds the speed of light ...
... – A black hole is a massive object whose radius is so small that the escape velocity exceeds the speed of light ...
M104: The Sombrero Galaxy
... Sombrero contains nearly 2,000 globular clusters —10 times as many as orbit our Milky Way. The ages of the clusters are similar to those in the Milky Way, ranging from 10 billion to 13 billion years old. The Sombrero is suspected of harboring a central black hole that is billions of times more massi ...
... Sombrero contains nearly 2,000 globular clusters —10 times as many as orbit our Milky Way. The ages of the clusters are similar to those in the Milky Way, ranging from 10 billion to 13 billion years old. The Sombrero is suspected of harboring a central black hole that is billions of times more massi ...
ph507rev1
... relatively inaccurate method of statistical parallaxes. His zero point was then used to find the distances to many other galaxies. Further work showed that there are two types of Cepheids, each with its own separate, almost parallel P-L relationship. ...
... relatively inaccurate method of statistical parallaxes. His zero point was then used to find the distances to many other galaxies. Further work showed that there are two types of Cepheids, each with its own separate, almost parallel P-L relationship. ...
M104: The Sombrero Galaxy
... Sombrero contains nearly 2,000 globular clusters —10 times as many as orbit our Milky Way. The ages of the clusters are similar to those in the Milky Way, ranging from 10 billion to 13 billion years old. The Sombrero is suspected of harboring a central black hole that is billions of times more massi ...
... Sombrero contains nearly 2,000 globular clusters —10 times as many as orbit our Milky Way. The ages of the clusters are similar to those in the Milky Way, ranging from 10 billion to 13 billion years old. The Sombrero is suspected of harboring a central black hole that is billions of times more massi ...
Perseus (constellation)
Perseus, named after the Greek mythological hero Perseus, is a constellation in the northern sky. It was one of 48 listed by the 2nd-century astronomer Ptolemy and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located in the northern celestial hemisphere near several other constellations named after legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west.The galactic plane of the Milky Way passes through Perseus but is mostly obscured by molecular clouds. The constellation's brightest star is the yellow-white supergiant Alpha Persei (also called Mirfak), which shines at magnitude 1.79. It and many of the surrounding stars are members of an open cluster known as the Alpha Persei Cluster. The best-known star, however, is Algol (Beta Persei), linked with ominous legends because of its variability, which is noticeable to the naked eye. Rather than being an intrinsically variable star, it is an eclipsing binary. Other notable star systems in Perseus include X Persei, a binary system containing a neutron star, and GK Persei, a nova that peaked at magnitude 0.2 in 1901. The Double Cluster, comprising two open clusters quite near each other in the sky, was known to the ancient Chinese. The constellation gives its name to the Perseus Cluster (Abell 426), a massive galaxy cluster located 250 million light-years from Earth. It hosts the radiant of the annual Perseids meteor shower—one of the most prominent meteor showers in the sky.