FY96
... greater than 10 km/s in observations separated by 11 months. Including the efficiency for discovering binaries with different periods and orbital parameters, Cote and Fischer's result yields a binary fraction of 15% in M4. In a companion study, Cote, Carlton Pryor (Rutgers U.), Robert McClure, J.M. ...
... greater than 10 km/s in observations separated by 11 months. Including the efficiency for discovering binaries with different periods and orbital parameters, Cote and Fischer's result yields a binary fraction of 15% in M4. In a companion study, Cote, Carlton Pryor (Rutgers U.), Robert McClure, J.M. ...
Photometric Variability and Rotation in Magnetic White Dwarfs
... emerged between the spin period and magnetic field strength and temperature, suggesting hotter MWDs spin faster and have higher field strengths, characteristics possibly associated with MWDs that might have formed in binary mergers. A similar investigation is carried out on longer timescales (months ...
... emerged between the spin period and magnetic field strength and temperature, suggesting hotter MWDs spin faster and have higher field strengths, characteristics possibly associated with MWDs that might have formed in binary mergers. A similar investigation is carried out on longer timescales (months ...
Electromagnetic Properties of Neutrinos
... between the left-handed components of the three flavor neutrino fields νe , νμ , ντ and the lefthanded components of three massive neutrino fields νk with masses mk k 1, 2, 3. The 3 × 3 mixing matrix U is unitary U† U−1 . Neutrino electromagnetic properties are discussed in 4–7, and in the ...
... between the left-handed components of the three flavor neutrino fields νe , νμ , ντ and the lefthanded components of three massive neutrino fields νk with masses mk k 1, 2, 3. The 3 × 3 mixing matrix U is unitary U† U−1 . Neutrino electromagnetic properties are discussed in 4–7, and in the ...
Turning Points in the Evolution of Isolated Neutron Stars` Magnetic
... function of the density, temperature, chemical composition, impurity concentration, the occurence of superfluidity and perhaps other factors and increases usually significantly when the NS cools down. The magnetization parameter may therefore exceed unity in different phases of a NS’s life and perhaps ...
... function of the density, temperature, chemical composition, impurity concentration, the occurence of superfluidity and perhaps other factors and increases usually significantly when the NS cools down. The magnetization parameter may therefore exceed unity in different phases of a NS’s life and perhaps ...
Ch a n d
... various kinds of mass outflow. The impact of plasma onto the stellar surface from magnetospheric accretion streams, can be a dominant source of energy and momentum in the upper atmospheres of T Tauri stars. We present models in which turbulence is induced by these impacts, and waves then spread out ...
... various kinds of mass outflow. The impact of plasma onto the stellar surface from magnetospheric accretion streams, can be a dominant source of energy and momentum in the upper atmospheres of T Tauri stars. We present models in which turbulence is induced by these impacts, and waves then spread out ...
MULTI-FREQUENCY TIME VARIABILITY OF ACTIVE GALACTIC NUCLEI RITABAN CHATTERJEE
... me after I wrote an email asking if I could work with him in the summer (of 2004) and “may be also after that.” It read, “Welcome to the Blazar group, Ritaban”, and in the next five years I never hesitated to knock on his door. He was always there. At first, to answer my questions, then, as time we ...
... me after I wrote an email asking if I could work with him in the summer (of 2004) and “may be also after that.” It read, “Welcome to the Blazar group, Ritaban”, and in the next five years I never hesitated to knock on his door. He was always there. At first, to answer my questions, then, as time we ...
My Thesis - Uppsala Astronomical Observatory
... The faculty and staff at Dartmouth have been wonderful. The guidance and mentoring I have received was crucial to my development as a scientist. This is especially true of the astronomers: Gary Wegner, Ryan Hickox, Rob Fesen, John Thorstensen, and Brian Chaboyer. You have all been an inspiration. I ...
... The faculty and staff at Dartmouth have been wonderful. The guidance and mentoring I have received was crucial to my development as a scientist. This is especially true of the astronomers: Gary Wegner, Ryan Hickox, Rob Fesen, John Thorstensen, and Brian Chaboyer. You have all been an inspiration. I ...
Multiwavelength study of 20 jets that emanate from the periphery of
... of the plasma heating and cooling, and the relationship to the photospheric magnetic field have yet to be understood. It has been observed that jets are associated with emerging field regions, magnetic cancellation (Chifor et al. 2008), and locations of photospheric-shearing motions (Shimojo et al. ...
... of the plasma heating and cooling, and the relationship to the photospheric magnetic field have yet to be understood. It has been observed that jets are associated with emerging field regions, magnetic cancellation (Chifor et al. 2008), and locations of photospheric-shearing motions (Shimojo et al. ...
the PDF program book
... It is our goal to provide you with a relaxed and comfortable experience. Sweden is a safe friendly place and the Cool Stars 19 organizers are committed to making this meeting productive and enjoyable for everyone, regardless of gender, sexual orientation, disability, physical appearance, body size, ...
... It is our goal to provide you with a relaxed and comfortable experience. Sweden is a safe friendly place and the Cool Stars 19 organizers are committed to making this meeting productive and enjoyable for everyone, regardless of gender, sexual orientation, disability, physical appearance, body size, ...
![[C ii] 157 μm Emission in a Five-component Interstellar](http://s1.studyres.com/store/data/019898103_1-04a729a979ed8700f387bc0fbfcce724-300x300.png)
[C ii] 157 μm Emission in a Five-component Interstellar
... originates from the photons of massive young stars. For simplicity we do not takeother sources of mechanical heating into account, i.e., turbulence, which can also be important to the physics and chemistry of the ISM phases, as has been seen in the high-latitude Galatic diffuse clouds (Ingalls et a ...
... originates from the photons of massive young stars. For simplicity we do not takeother sources of mechanical heating into account, i.e., turbulence, which can also be important to the physics and chemistry of the ISM phases, as has been seen in the high-latitude Galatic diffuse clouds (Ingalls et a ...
JENAM-2011 Book of abstracts
... stars and stellar mass black holes in X-ray binaries. Chandra and XMM-Newton observations revealed that their populations scale with the star-formation rate and stellar mass of the host galaxy. Thus, the X-ray luminosity of a star- forming galaxy can be used as a star-formation rate proxy. The lumin ...
... stars and stellar mass black holes in X-ray binaries. Chandra and XMM-Newton observations revealed that their populations scale with the star-formation rate and stellar mass of the host galaxy. Thus, the X-ray luminosity of a star- forming galaxy can be used as a star-formation rate proxy. The lumin ...
Double relics in Abell 2345 and Abell 1240
... The radio emission of Abell 2345 is characterized by the presence of two relics visible in the NVSS (Giovannini et al. 1999). Our new VLA observations confirm the presence of two regions where non-thermal emission is present at the cluster periphery, nearly symmetrical with respect to the cluster ce ...
... The radio emission of Abell 2345 is characterized by the presence of two relics visible in the NVSS (Giovannini et al. 1999). Our new VLA observations confirm the presence of two regions where non-thermal emission is present at the cluster periphery, nearly symmetrical with respect to the cluster ce ...
FERMI GBM detections of four AXPs at soft gamma-rays
... (1998) measured the period and period derivative of SGR 1806-20. From these measurements, they found that the observed persistent X-ray flux of this SGR is two orders of magnitude higher than what can be explained from rotational energy loss, indicating that SGR 1806-20 is not rotation-powered. More ...
... (1998) measured the period and period derivative of SGR 1806-20. From these measurements, they found that the observed persistent X-ray flux of this SGR is two orders of magnitude higher than what can be explained from rotational energy loss, indicating that SGR 1806-20 is not rotation-powered. More ...
Magnetic fields and mass loss in massive stars
... On the main sequence, magnetic fields are frequently found in late-type stars, which are thought to have dynamo generated fields, and in the chemically peculiar Ap/Bp stars. The chemical peculiarities in these stars are related to their strong magnetic fields. Only recently magnetic fields have been ...
... On the main sequence, magnetic fields are frequently found in late-type stars, which are thought to have dynamo generated fields, and in the chemically peculiar Ap/Bp stars. The chemical peculiarities in these stars are related to their strong magnetic fields. Only recently magnetic fields have been ...
Neptune and Triton_ Essential pieces of the Solar System puzzle
... Therefore, a combination of new and more accurate observations and development of consistent interior models would allow us to solve a number of major mysteries concerning planetary atmospheres, formation, and evolution. In particular, why is Neptune's measured intrinsic heat flux so high? This high ...
... Therefore, a combination of new and more accurate observations and development of consistent interior models would allow us to solve a number of major mysteries concerning planetary atmospheres, formation, and evolution. In particular, why is Neptune's measured intrinsic heat flux so high? This high ...
comets
... cross the orbits of several planets must from time to time collide with one, resulting in the destruction of a comet. Second, less obvious but still important, is the possibility that an encounter with a massive planet may eject the comet from the Solar System at a speed above the local escape velo ...
... cross the orbits of several planets must from time to time collide with one, resulting in the destruction of a comet. Second, less obvious but still important, is the possibility that an encounter with a massive planet may eject the comet from the Solar System at a speed above the local escape velo ...
Global Seismology of the Sun
... detector cool evaporated, but Buzasi (2000) realised that the star tracker could be used to monitor stellar variability and hence to look for stellar oscillations. This followed the observations of α UMa and α Cen A (Buzasi et al., 2000; Schou and Buzasi, 2001; Fletcher et al., 2006). The Canadian ...
... detector cool evaporated, but Buzasi (2000) realised that the star tracker could be used to monitor stellar variability and hence to look for stellar oscillations. This followed the observations of α UMa and α Cen A (Buzasi et al., 2000; Schou and Buzasi, 2001; Fletcher et al., 2006). The Canadian ...
SOHO`s Frequently Asked Questions
... All of this activity follows an 11-year cycle. Every 11 years, the number of sunspots, flares, and solar storms increases to a peak. Then, after a few years of high activity, the Sun will ramp down to a few years of low activity. This pattern is called the "sunspot cycle," the "solar cycle," or the ...
... All of this activity follows an 11-year cycle. Every 11 years, the number of sunspots, flares, and solar storms increases to a peak. Then, after a few years of high activity, the Sun will ramp down to a few years of low activity. This pattern is called the "sunspot cycle," the "solar cycle," or the ...
the PDF - Montana State University
... the nature of its well-ordered generation of magnetic field in 11-year activity cycles remains a mystery. In this work, we place the solar cycle in a broader context by examining the long-term variability of solar analog stars within 5% of the solar effective temperature, but varied in rotation rate ...
... the nature of its well-ordered generation of magnetic field in 11-year activity cycles remains a mystery. In this work, we place the solar cycle in a broader context by examining the long-term variability of solar analog stars within 5% of the solar effective temperature, but varied in rotation rate ...
doctoral thesis (Dissertation)
... line ratios similar to coronal sources, indicating that neither a high density nor a strong UV-field is present in the region of the X-ray emission. Using these and similar observations, it can be concluded that at least three mechanisms contribute to the observed high-energy emission from CTTS: Fir ...
... line ratios similar to coronal sources, indicating that neither a high density nor a strong UV-field is present in the region of the X-ray emission. Using these and similar observations, it can be concluded that at least three mechanisms contribute to the observed high-energy emission from CTTS: Fir ...
Non-thermal emission processes in massive binaries*
... magnetic field of massive stars is not an easy task, mostly because of the difficulty to investigate a Zeeman splitting in line profiles already broadened due to the fast rotation of the star. However, some recent observations led to the direct measurement of the magnetic field strength in the case of a ...
... magnetic field of massive stars is not an easy task, mostly because of the difficulty to investigate a Zeeman splitting in line profiles already broadened due to the fast rotation of the star. However, some recent observations led to the direct measurement of the magnetic field strength in the case of a ...
Horace Welcome Babcock - National Academy of Sciences
... velocities, advised by Lick astronomer R. J. Trumpler, and found that they did not match the rotation curve calculated for the constant mass-to-light ratio, then the usual assumption made for starlight. Upon converting his radial velocities to angular velocities about the center of M31, Horace noted ...
... velocities, advised by Lick astronomer R. J. Trumpler, and found that they did not match the rotation curve calculated for the constant mass-to-light ratio, then the usual assumption made for starlight. Upon converting his radial velocities to angular velocities about the center of M31, Horace noted ...
the entire issue as one large (23
... Keywords: W.W. Morgan, spiral arms of our Galaxy, radio astronomy, Jan Oort, Yerkes Observatory, Edwin Frost, Otto Struve, stellar classification, MKK system, OB stars, OB associations, Walter Baade, Andromeda Nebula, HII regions, Jason Nassau, Stewart Sharpless, Donald Osterbrock, Local Arm, Perseu ...
... Keywords: W.W. Morgan, spiral arms of our Galaxy, radio astronomy, Jan Oort, Yerkes Observatory, Edwin Frost, Otto Struve, stellar classification, MKK system, OB stars, OB associations, Walter Baade, Andromeda Nebula, HII regions, Jason Nassau, Stewart Sharpless, Donald Osterbrock, Local Arm, Perseu ...
Corona
A corona (Latin, 'crown') is an aura of plasma that surrounds the sun and other celestial bodies. The Sun's corona extends millions of kilometres into space and is most easily seen during a total solar eclipse, but it is also observable with a coronagraph. The word ""corona"" is a Latin word meaning ""crown"", from the Ancient Greek κορώνη (korōnē, “garland, wreath”).The high temperature of the Sun's corona gives it unusual spectral features, which led some in the 19th century to suggest that it contained a previously unknown element, ""coronium"". Instead, these spectral features have since been explained by highly ionized iron (Fe-XIV). Bengt Edlén, following the work of Grotrian (1939), first identified the coronal lines in 1940 (observed since 1869) as transitions from low-lying metastable levels of the ground configuration of highly ionised metals (the green Fe-XIV line at 5303 Å, but also the red line Fe-X at 6374 Å). These high stages of ionisation indicate a plasma temperature in excess of 1,000,000 kelvin, much hotter than the surface of the sun.Light from the corona comes from three primary sources, which are called by different names although all of them share the same volume of space. The K-corona (K for kontinuierlich, ""continuous"" in German) is created by sunlight scattering off free electrons; Doppler broadening of the reflected photospheric absorption lines completely obscures them, giving the spectral appearance of a continuum with no absorption lines. The F-corona (F for Fraunhofer) is created by sunlight bouncing off dust particles, and is observable because its light contains the Fraunhofer absorption lines that are seen in raw sunlight; the F-corona extends to very high elongation angles from the Sun, where it is called the zodiacal light. The E-corona (E for emission) is due to spectral emission lines produced by ions that are present in the coronal plasma; it may be observed in broad or forbidden or hot spectral emission lines and is the main source of information about the corona's composition.