2 Statistical properties of a sample of periodically variable B-type supergiants
... The photometric behaviour of different kinds of evolved massive stars were analysed in detail from HIPPARCOS data. Van Leeuwen et al. (1998) performed an analysis of 24 known B- to G-type variable supergiants and found periods of tens of days for each of them, in agreement with previous ground-based ...
... The photometric behaviour of different kinds of evolved massive stars were analysed in detail from HIPPARCOS data. Van Leeuwen et al. (1998) performed an analysis of 24 known B- to G-type variable supergiants and found periods of tens of days for each of them, in agreement with previous ground-based ...
CH15.AST1001.F16.EDS
... Where will the gas be in 1 trillion years? A. Blown out of galaxy B. Still recycling just like now C. Locked into white dwarfs and low-mass stars ...
... Where will the gas be in 1 trillion years? A. Blown out of galaxy B. Still recycling just like now C. Locked into white dwarfs and low-mass stars ...
Age aspects of habitability - Cambridge University Press
... and have much denser and faster stellar winds with an average wind density of up to 1000 times higher. Low-mass K- and M-type stars remain X-ray and EUV-active longer than solartype stars, where EUV emission can be up to 3–4 times and 10– 100 times, respectively, higher than G-type stars of the same ...
... and have much denser and faster stellar winds with an average wind density of up to 1000 times higher. Low-mass K- and M-type stars remain X-ray and EUV-active longer than solartype stars, where EUV emission can be up to 3–4 times and 10– 100 times, respectively, higher than G-type stars of the same ...
Grzegorz Nowak, Andrzej Niedzielski, Aleksander Wolszczan, Pawe
... Red giants represent later phase of evolution of the main sequence stars. The planet induced Doppler shifts are easy to detect in radial velocity measurements of these stars, because they have lower effective temperatures and lower rotational velocities compared to their main sequence progenitors. T ...
... Red giants represent later phase of evolution of the main sequence stars. The planet induced Doppler shifts are easy to detect in radial velocity measurements of these stars, because they have lower effective temperatures and lower rotational velocities compared to their main sequence progenitors. T ...
The Search for the Earliest Galaxies
... to 800 million years after the Big Bang. Astronomers inferred the redshifts by comparing the galaxies’ brightnesses in different near-infrared wavelength bands with visual-wavelength images recorded by Hubble’s Advanced Camera for Surveys (ACS) from 2004 to 2010. They also combined the new Hubble d ...
... to 800 million years after the Big Bang. Astronomers inferred the redshifts by comparing the galaxies’ brightnesses in different near-infrared wavelength bands with visual-wavelength images recorded by Hubble’s Advanced Camera for Surveys (ACS) from 2004 to 2010. They also combined the new Hubble d ...
Astronomy and Astrophysics 336, 972, 1998
... One of the major puzzles in the study of stellar surfaces has been the discovery of cool starspots at high latitudes or even, as frequently appears, a cool cap at the rotation poles of rapidlyrotating late-type stars. The puzzle comes because the Sun shows spots only in two narrow equatorial bands. ...
... One of the major puzzles in the study of stellar surfaces has been the discovery of cool starspots at high latitudes or even, as frequently appears, a cool cap at the rotation poles of rapidlyrotating late-type stars. The puzzle comes because the Sun shows spots only in two narrow equatorial bands. ...
Why is the Sun very dense on the inside?
... a) Some stars are larger than others and therefore appear larger. b) Some stars are nearer than others and therefore appear larger. c) Photographs make brighter stars appear larger than fainter stars, although they should all be points of light. d) Sometimes what looks like a single star is actu ...
... a) Some stars are larger than others and therefore appear larger. b) Some stars are nearer than others and therefore appear larger. c) Photographs make brighter stars appear larger than fainter stars, although they should all be points of light. d) Sometimes what looks like a single star is actu ...
Evolution of Population II Stars in the Helium
... Evolution of Population I stars with 15.6 M 0 4>, 5> and 4 M 0 6> in the heliumburning phase has been investigated taking into account the effect of helium depletion on the mean molecular weight and on the rate of helium burning. The results have shown that the stellar radius strongly depends not on ...
... Evolution of Population I stars with 15.6 M 0 4>, 5> and 4 M 0 6> in the heliumburning phase has been investigated taking into account the effect of helium depletion on the mean molecular weight and on the rate of helium burning. The results have shown that the stellar radius strongly depends not on ...
GRB jets and their interaction with the progenitor star
... The break-out time depends very mildly on the mass, so too the energy deposited into the star ...
... The break-out time depends very mildly on the mass, so too the energy deposited into the star ...
KIC 10449976: discovery of an extreme helium
... 40 000 K, log g = 5.5 and nHe = 0.95, abundances for carbon, nitrogen, silicon and neon were estimated (Table 2). If silicon can be taken as a proxy for metallicity, the star is relatively metal poor, as indicated by the optimization described above. No carbon lines are identified, providing an uppe ...
... 40 000 K, log g = 5.5 and nHe = 0.95, abundances for carbon, nitrogen, silicon and neon were estimated (Table 2). If silicon can be taken as a proxy for metallicity, the star is relatively metal poor, as indicated by the optimization described above. No carbon lines are identified, providing an uppe ...
flyer
... these objects exist ever since they were first observed as pulsars. They are the collapsed cores of massive stars that have run out of fuel and undergone a supernova explosion. With a mass of slightly more than the Sun's (∼2.8×1030 kg) packed into a sphere of radius ∼10 km, neutron stars are about 4 ...
... these objects exist ever since they were first observed as pulsars. They are the collapsed cores of massive stars that have run out of fuel and undergone a supernova explosion. With a mass of slightly more than the Sun's (∼2.8×1030 kg) packed into a sphere of radius ∼10 km, neutron stars are about 4 ...
It is now recognized that the vast majority of ellipticals are of
... • The dust lanes seen in E galaxies imply that the absorbing material is distributed in rings or disks. Dust lanes may be aligned with either the major or minor axes, or they may be warped. • E galaxies contain modest amounts of cool and warm gas, although not as much as is found in S galaxies. A fe ...
... • The dust lanes seen in E galaxies imply that the absorbing material is distributed in rings or disks. Dust lanes may be aligned with either the major or minor axes, or they may be warped. • E galaxies contain modest amounts of cool and warm gas, although not as much as is found in S galaxies. A fe ...
Zapartas_deMink_Izzard_AA_2017
... of systems with a companion in very close orbit, P = 2 10 days, and q > 0.1. They find that this fraction drops from 0.22 for early B-type to 0.16 for late B-type stars. Information on systems with orbits longer than 10 days are not available from this study. These results may either indicate that t ...
... of systems with a companion in very close orbit, P = 2 10 days, and q > 0.1. They find that this fraction drops from 0.22 for early B-type to 0.16 for late B-type stars. Information on systems with orbits longer than 10 days are not available from this study. These results may either indicate that t ...
- ANU Repository
... and is essentially zero at 4 R⊕ , although we identify three giant planet candidates other than the previously confirmed Kepler-45b. There is suggestive but not significant evidence that the radius distribution varies with orbital period. The distribution with logarithmic orbital period is flat except ...
... and is essentially zero at 4 R⊕ , although we identify three giant planet candidates other than the previously confirmed Kepler-45b. There is suggestive but not significant evidence that the radius distribution varies with orbital period. The distribution with logarithmic orbital period is flat except ...
Mazzarot - One Torah For All
... is not too difficult to show the proper usage of the sun and the moon in the life of the believer. The moon from time immemorial has been worshiped in a way that YHWH did not command. This wrong worship of the moon does not mean that there is not a right was to use the moon as a follower of YHWH. A ...
... is not too difficult to show the proper usage of the sun and the moon in the life of the believer. The moon from time immemorial has been worshiped in a way that YHWH did not command. This wrong worship of the moon does not mean that there is not a right was to use the moon as a follower of YHWH. A ...
Ursa Minor
Ursa Minor (Latin: ""Smaller She-Bear"", contrasting with Ursa Major), also known as the Little Bear, is a constellation in the northern sky. Like the Great Bear, the tail of the Little Bear may also be seen as the handle of a ladle, hence the name Little Dipper. It was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and remains one of the 88 modern constellations. Ursa Minor has traditionally been important for navigation, particularly by mariners, due to Polaris being the North Star.Polaris, the brightest star in the constellation, is a yellow-white supergiant and the brightest Cepheid variable star in the night sky, ranging from apparent magnitude 1.97 to 2.00. Beta Ursae Minoris, also known as Kochab, is an aging star that has swollen and cooled to become an orange giant with an apparent magnitude of 2.08, only slightly fainter than Polaris. Kochab and magnitude 3 Gamma Ursae Minoris have been called the ""guardians of the pole star"". Planets have been detected orbiting four of the stars, including Kochab. The constellation also contains an isolated neutron star—Calvera—and H1504+65, the hottest white dwarf yet discovered with a surface temperature of 200,000 K.