Word doc - UC-HiPACC - University of California, Santa Cruz
... “We had no idea what these things were,” recounted D. Andrew Howell, staff scientist at Las Cumbres Observatory Global Telescope Network and adjunct assistant professor at UC Santa Barbara. In 2006 and 2007, two objects caught by the detectors of the Supernova Legacy Survey looked like supernovae—st ...
... “We had no idea what these things were,” recounted D. Andrew Howell, staff scientist at Las Cumbres Observatory Global Telescope Network and adjunct assistant professor at UC Santa Barbara. In 2006 and 2007, two objects caught by the detectors of the Supernova Legacy Survey looked like supernovae—st ...
Globular Clusters
... This allows a direct check on the validity of the detailed evolution theory. When GCs are considered just as a million or so pointlike masses in a small volume, subject to internal and external dynamical interactions, they represent an ideal workbench to study STELLAR DYNAMICS and to test most exqui ...
... This allows a direct check on the validity of the detailed evolution theory. When GCs are considered just as a million or so pointlike masses in a small volume, subject to internal and external dynamical interactions, they represent an ideal workbench to study STELLAR DYNAMICS and to test most exqui ...
Labeling the HR Diagram - Mastering Physics Answers
... Hint 6. How do we determine the radius of a distant star? The most common way of determining a star’s radius is to ___________. ANSWER: determine it from the star’s parallax angle calculate it from the star’s luminosity and surface temperature measure the star’s angular diameter in the sky ...
... Hint 6. How do we determine the radius of a distant star? The most common way of determining a star’s radius is to ___________. ANSWER: determine it from the star’s parallax angle calculate it from the star’s luminosity and surface temperature measure the star’s angular diameter in the sky ...
Pop Quiz Question
... The apparent magntiude of the Sun is A. Close to 5 as it is average in luminosity B. Close to -27 as it is the brightest object in the sky C. Close to -5 as it is average in luminosity D. Close to 27 as it is the brightest object in the sky ...
... The apparent magntiude of the Sun is A. Close to 5 as it is average in luminosity B. Close to -27 as it is the brightest object in the sky C. Close to -5 as it is average in luminosity D. Close to 27 as it is the brightest object in the sky ...
129 DYNAMICAL STREAMS IN THE SOLAR NEIGHBOURHOOD B
... be due to a lumpy potential related to the presence of strong transient spiral waves. Besides those simulations, a recent model of gas flows in the Galaxy (Bissantz et al. 2003) indicates that the amplitude of the spiral structure in the mass density is larger by a factor 1.5 than its amplitude in t ...
... be due to a lumpy potential related to the presence of strong transient spiral waves. Besides those simulations, a recent model of gas flows in the Galaxy (Bissantz et al. 2003) indicates that the amplitude of the spiral structure in the mass density is larger by a factor 1.5 than its amplitude in t ...
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 ) ...
Volume 2 - Euresis Journal
... The first planets discovered were, naturally, those that are easiest to find – massive objects like Jupiter. However, the big surprise was that these planets were orbiting their stars at tiny separations, smaller than Mercury’s orbit in the solar system, and hence with orbital periods of only a few ...
... The first planets discovered were, naturally, those that are easiest to find – massive objects like Jupiter. However, the big surprise was that these planets were orbiting their stars at tiny separations, smaller than Mercury’s orbit in the solar system, and hence with orbital periods of only a few ...
The Physics of Massive Star Formation
... It is appealing to explain properties of massive stars in terms of massive cores …but if massive cores fragment to many stars, there is no direct core-star mapping, MF agreement is just a coincidence. Do massive cores fragment? ...
... It is appealing to explain properties of massive stars in terms of massive cores …but if massive cores fragment to many stars, there is no direct core-star mapping, MF agreement is just a coincidence. Do massive cores fragment? ...
The APEX Telescope Large Area Survey of the Galaxy (ATLASGAL)
... The conclusion from this study is that more than a quarter of the bubbles could have triggered the formation of massive objects. Star formation triggered by H ii regions has long been thought to be an important process, especially for the formation of massive stars, but so far little systematic evi ...
... The conclusion from this study is that more than a quarter of the bubbles could have triggered the formation of massive objects. Star formation triggered by H ii regions has long been thought to be an important process, especially for the formation of massive stars, but so far little systematic evi ...
Lecture18
... Off the main sequence Some stars hot but faint, or cool but very bright: Stars not on the main sequence: giants and super-giants, white dwarfs (all late phases in a star’s lifetime). “Luminosity class” used to distinguish a red main sequence (e.g. M5V) from a red supergiant (M5I). Sizes of stars va ...
... Off the main sequence Some stars hot but faint, or cool but very bright: Stars not on the main sequence: giants and super-giants, white dwarfs (all late phases in a star’s lifetime). “Luminosity class” used to distinguish a red main sequence (e.g. M5V) from a red supergiant (M5I). Sizes of stars va ...
Lecture 12: Evolution of the Galaxy
... • New stars which form therefore have higher values of heavy element mass fraction, Z, at the time of their birth. The youngest stars are therefore the most heavy-element rich, and the oldest ones (Population II stars) are the most deficient in heavy elements relative to the Sun. • Halo Population I ...
... • New stars which form therefore have higher values of heavy element mass fraction, Z, at the time of their birth. The youngest stars are therefore the most heavy-element rich, and the oldest ones (Population II stars) are the most deficient in heavy elements relative to the Sun. • Halo Population I ...
Is Draco II one of the faintest dwarf galaxies? First study from Keck
... of stars 2 and 10, which must have very similar stellar parameters as they are confirmed Dra II member stars with almost identical colours and magnitudes ((0.53,18.87) and (0.55,18.98)), implies that these two member stars have significantly different metallicities (a 4.5σ difference in the equivale ...
... of stars 2 and 10, which must have very similar stellar parameters as they are confirmed Dra II member stars with almost identical colours and magnitudes ((0.53,18.87) and (0.55,18.98)), implies that these two member stars have significantly different metallicities (a 4.5σ difference in the equivale ...
19. Our Galaxy 19.1 The Milky Way Revealed Our goals for learning
... • What is the significance of a rotation curve that is flat at large distances from the galactic center? • The Milky Way’s flat rotation curve implies that the matter associated with our galaxy extends to large distances from the center. A rotation curve is a plot of the orbital speed of stars or ga ...
... • What is the significance of a rotation curve that is flat at large distances from the galactic center? • The Milky Way’s flat rotation curve implies that the matter associated with our galaxy extends to large distances from the center. A rotation curve is a plot of the orbital speed of stars or ga ...
ph507weeks1
... parallax accuracy to 0.001” within a few years. Before 1990, fewer than 10,000 stellar parallaxes had been measured (and only 500 known well), but there are about 1012 stars in our Galaxy. Space observations made by the European Space Agency with the Hipparcos mission (1989-1993) accurately determin ...
... parallax accuracy to 0.001” within a few years. Before 1990, fewer than 10,000 stellar parallaxes had been measured (and only 500 known well), but there are about 1012 stars in our Galaxy. Space observations made by the European Space Agency with the Hipparcos mission (1989-1993) accurately determin ...
Ardua et Astra: On the Calculation of the Dates of the Rising and
... In what follows, I use the terminology in the first column of Table One: it has the significant advantage of being clear and practical, and also corresponds to the terms used by the Greeks themselves in the earliest extant handbooks.16 The terms ‘heliacal’, ‘acronychal’ and ‘cosmical’ are by contras ...
... In what follows, I use the terminology in the first column of Table One: it has the significant advantage of being clear and practical, and also corresponds to the terms used by the Greeks themselves in the earliest extant handbooks.16 The terms ‘heliacal’, ‘acronychal’ and ‘cosmical’ are by contras ...
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.