A Thermodynamic History of the Solar Constitution — II
... 1 The search for a continuous thermal spectrum: Car- dominant role [7]. Balfour Stewart [8] who, along with Gusbon particles on the Sun? tav Kirchhoff [9], was one of the fathers of thermal emission, emphasized the crucial role of carbon in heat radiation: “InConsider particulate matter floating on ...
... 1 The search for a continuous thermal spectrum: Car- dominant role [7]. Balfour Stewart [8] who, along with Gusbon particles on the Sun? tav Kirchhoff [9], was one of the fathers of thermal emission, emphasized the crucial role of carbon in heat radiation: “InConsider particulate matter floating on ...
PDF format
... – An H-R diagram plots stellar luminosity of stars versus surface temperature (or color or spectral type). • What is the significance of the main sequence? – Normal stars that fuse H to He in their cores fall on the main sequence of an H-R diagram. – A star's mass determines its position along t ...
... – An H-R diagram plots stellar luminosity of stars versus surface temperature (or color or spectral type). • What is the significance of the main sequence? – Normal stars that fuse H to He in their cores fall on the main sequence of an H-R diagram. – A star's mass determines its position along t ...
KIC 10449976: discovery of an extreme helium
... Best-fitting atmospheric parameters for KIC 10449976 were established by interpolation in a grid of synthetic spectra computed from a grid of line-blanketed model atmospheres computed in local thermodynamic, hydrostatic and radiative equilibrium. The grid covers a wide range in effective temperature ...
... Best-fitting atmospheric parameters for KIC 10449976 were established by interpolation in a grid of synthetic spectra computed from a grid of line-blanketed model atmospheres computed in local thermodynamic, hydrostatic and radiative equilibrium. The grid covers a wide range in effective temperature ...
script
... Background: Very few people have a comprehensive view of our place in the universe. They think about astronomical objects as disconnected elements, rather than an integrated system. This demonstration takes visitors from our Solar System, the part of the universe with which they are most familiar, o ...
... Background: Very few people have a comprehensive view of our place in the universe. They think about astronomical objects as disconnected elements, rather than an integrated system. This demonstration takes visitors from our Solar System, the part of the universe with which they are most familiar, o ...
Ardua et Astra: On the Calculation of the Dates of the Rising and
... means of the rising and setting of various stars and constellations. Hesiod encourages us to begin the harvest at the rising of the Pleiades, and to plough at their setting; Alcaeus encourages us to drink at the rising of Sirius; and Horace assures us that a man content with his lot is not disturbed ...
... means of the rising and setting of various stars and constellations. Hesiod encourages us to begin the harvest at the rising of the Pleiades, and to plough at their setting; Alcaeus encourages us to drink at the rising of Sirius; and Horace assures us that a man content with his lot is not disturbed ...
ExoPlanet News No. 74, November 3rd, 2014 Contents An Electronic Newsletter
... Recently, the Kepler Space Telescope has detected several planets in orbit around a close binary star system. These so-called circumbinary planets will experience non-trivial spatial and temporal distributions of radiative flux on their surfaces, with features not seen in their single-star orbiting ...
... Recently, the Kepler Space Telescope has detected several planets in orbit around a close binary star system. These so-called circumbinary planets will experience non-trivial spatial and temporal distributions of radiative flux on their surfaces, with features not seen in their single-star orbiting ...
Cygnus X-2, super-Eddington mass transfer, and pulsar binaries
... with ignition of central helium burning (KW). Neither of these two cases describes Cygnus X-2. However, there is an intermediate possibility: the initial mass ratio qi may be such that the donor retains a small but non-negligible hydrogen envelope as mass transfer slows. The current effective temper ...
... with ignition of central helium burning (KW). Neither of these two cases describes Cygnus X-2. However, there is an intermediate possibility: the initial mass ratio qi may be such that the donor retains a small but non-negligible hydrogen envelope as mass transfer slows. The current effective temper ...
Multiplicity in Early Stellar Evolution - Astronomy Group
... their previous work on 1-M⊙ clouds to include 100-M⊙ clouds, but again found that magnetic fields and radiative transfer combined to inhibit fragmentation. Seifried et al. (2012) found that their 100-M⊙ turbulent, magnetic clouds collapsed to form just a relatively small number of protostars. Likewi ...
... their previous work on 1-M⊙ clouds to include 100-M⊙ clouds, but again found that magnetic fields and radiative transfer combined to inhibit fragmentation. Seifried et al. (2012) found that their 100-M⊙ turbulent, magnetic clouds collapsed to form just a relatively small number of protostars. Likewi ...
$doc.title
... 1998; Taylor et al. 2000), such a clear jet structure has never been observed. In this paper we report on EVN observations probing structures on scales of tens of milliarcseconds, larger than probed by previous observations. We clearly detect on this scale an elongation of the emission (Sect. 2), wh ...
... 1998; Taylor et al. 2000), such a clear jet structure has never been observed. In this paper we report on EVN observations probing structures on scales of tens of milliarcseconds, larger than probed by previous observations. We clearly detect on this scale an elongation of the emission (Sect. 2), wh ...
formation of z 6 quasars from hierarchical
... 6 Nagoya University, Dept. of Physics, Nagoya, Aichi 464-8602, Japan and 7 Spitzer Fellow Accepted to ApJ ...
... 6 Nagoya University, Dept. of Physics, Nagoya, Aichi 464-8602, Japan and 7 Spitzer Fellow Accepted to ApJ ...
Chapter15.1
... – An H-R diagram plots stellar luminosity of stars versus surface temperature (or color or spectral type). ...
... – An H-R diagram plots stellar luminosity of stars versus surface temperature (or color or spectral type). ...
Words: The Power Within - Endeavor Charter School
... Dictionary definition – (n) either of the two times in the year when the sun reaches its highest or lowest point in the sky at noon, marked by the longest or shortest day The summer solstice occurs around June 21 and the winter solstice around December 21. ...
... Dictionary definition – (n) either of the two times in the year when the sun reaches its highest or lowest point in the sky at noon, marked by the longest or shortest day The summer solstice occurs around June 21 and the winter solstice around December 21. ...
Suppose you tried to determine where we are in the galaxy by
... a) We can't count enough stars to get a good result. b) Interstellar dust blocks our view. c) Black holes distort the light from distant regions, giving a false result. d) Light from far-away stars that have died block our view, giving a false result. ...
... a) We can't count enough stars to get a good result. b) Interstellar dust blocks our view. c) Black holes distort the light from distant regions, giving a false result. d) Light from far-away stars that have died block our view, giving a false result. ...
Discovery of Kilohertz Quasi-periodic Oscillations from 4U 1820
... highest QPO frequency we observe is identified with the marginally stable orbit in the accretion disk, the neutron star mass may be 12 MJ, 35%–50% more massive than usually assumed. This may have consequences for the current evolutionary scenarios for this source and also for the debate about the ev ...
... highest QPO frequency we observe is identified with the marginally stable orbit in the accretion disk, the neutron star mass may be 12 MJ, 35%–50% more massive than usually assumed. This may have consequences for the current evolutionary scenarios for this source and also for the debate about the ev ...
A UV study of nearby luminous infrared galaxies: star formation
... a minor tail into the red sequence. The plots shown here are a useful benchmark for similar comparisons at high redshift. Both dust obscuration and the strength of star formation activity is likely to evolve with increasing look-back time and similar plots from high-redshift surveys are keenly antic ...
... a minor tail into the red sequence. The plots shown here are a useful benchmark for similar comparisons at high redshift. Both dust obscuration and the strength of star formation activity is likely to evolve with increasing look-back time and similar plots from high-redshift surveys are keenly antic ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.