Optical variability of the B-type star HD 105382: Pulsation or rotation?
... Because of these contradictions, we have subsequently taken several high-resolution Hα spectra during two weeks in February 2000, all of which are narrow and show absorption. We note that all our data taken for HD 105382 were obtained by remote central from Garching, so that the observer has only a ...
... Because of these contradictions, we have subsequently taken several high-resolution Hα spectra during two weeks in February 2000, all of which are narrow and show absorption. We note that all our data taken for HD 105382 were obtained by remote central from Garching, so that the observer has only a ...
Magnetic Fields in Stars
... small wavelength difference between the two sets of σ components. The presence of a field can be detected by this shift in the position of spectral lines between spectra observed in right- and left-circularly polarized light, or equivalently in the spectrum formed by the difference of the two spectr ...
... small wavelength difference between the two sets of σ components. The presence of a field can be detected by this shift in the position of spectral lines between spectra observed in right- and left-circularly polarized light, or equivalently in the spectrum formed by the difference of the two spectr ...
ms
... currently constrains at a significant level the neutron star equation of state, collectively, they point to neutron star radii that are in the 8-11 km range, which is consistent only with a subset of the proposed equations of state (see Özel, Baym, & Güver 2010). The two techniques mentioned above ...
... currently constrains at a significant level the neutron star equation of state, collectively, they point to neutron star radii that are in the 8-11 km range, which is consistent only with a subset of the proposed equations of state (see Özel, Baym, & Güver 2010). The two techniques mentioned above ...
Scattering of Sunlight in Lunar Exosphere Caused by Gravitational
... mechanical, electromagnetic, etc. For example, we can look on the momentum variation Δp as due to absorption or emission of electromagnetic energy. In this case, it was shown previously that the expression of χ , in the particular case of incident radiation on a heterogeneous matter(powder, dust, cl ...
... mechanical, electromagnetic, etc. For example, we can look on the momentum variation Δp as due to absorption or emission of electromagnetic energy. In this case, it was shown previously that the expression of χ , in the particular case of incident radiation on a heterogeneous matter(powder, dust, cl ...
The Secrets of Cosmic Grains - Max-Planck
... tio of carbon with atomic weights 12 and 13 is around 90 almost everywhere in the solar system, these grains are completely out of the ordinary: some have values two orders of magnitude lower, while others exhibit an isotope ratio almost 100 times higher. Why is this? It is assumed that stars eject ...
... tio of carbon with atomic weights 12 and 13 is around 90 almost everywhere in the solar system, these grains are completely out of the ordinary: some have values two orders of magnitude lower, while others exhibit an isotope ratio almost 100 times higher. Why is this? It is assumed that stars eject ...
The VLT LEGA-C Spectroscopic Survey: The Physics of Galaxies at
... in the distant past: mean stellar ages of L∗ galaxies are typically well over 5 Gyr and it is difficult to resolve star formation histories from integrated spectra. Now LEGA-C is obtaining spectra of similar quality for ∼3200 K-band selected galaxies in the redshift range 0.6 < z < 1.0, at a look-ba ...
... in the distant past: mean stellar ages of L∗ galaxies are typically well over 5 Gyr and it is difficult to resolve star formation histories from integrated spectra. Now LEGA-C is obtaining spectra of similar quality for ∼3200 K-band selected galaxies in the redshift range 0.6 < z < 1.0, at a look-ba ...
Transiting exoplanets from the CoRoT space mission
... The target star CoRoT-24 was observed on the detector E1 of the CoRoT satellite during its second Long Run pointing at the direction opposite to the approximate galactic center (“anticenter” in the CoRoT jargon). The observations lasted from 16 Nov. 2008 until 8 March 2009, covering a total span of ...
... The target star CoRoT-24 was observed on the detector E1 of the CoRoT satellite during its second Long Run pointing at the direction opposite to the approximate galactic center (“anticenter” in the CoRoT jargon). The observations lasted from 16 Nov. 2008 until 8 March 2009, covering a total span of ...
Binocular Objects (MS Word)
... The most dramatic globular cluster in the northern sky, it is faintly visible to the naked eye as a fuzzy spot. Easily seen through binoculars with a magnitude of 5.9, it lies 23,000 light years away. Its diameter is 160 light years and has more than a million stars. M92 Another excellent globular c ...
... The most dramatic globular cluster in the northern sky, it is faintly visible to the naked eye as a fuzzy spot. Easily seen through binoculars with a magnitude of 5.9, it lies 23,000 light years away. Its diameter is 160 light years and has more than a million stars. M92 Another excellent globular c ...
Discovery probability of transiting extragalactic planets and
... presence of the planet. The radius of the star’s orbit around the center of mass is so small(due to the greater mass) consequently the velocity of the star around the system’s center of mass is much smaller than that of the planet. However, velocity variations down to 0.5 m/s or even somewhat less c ...
... presence of the planet. The radius of the star’s orbit around the center of mass is so small(due to the greater mass) consequently the velocity of the star around the system’s center of mass is much smaller than that of the planet. However, velocity variations down to 0.5 m/s or even somewhat less c ...
ASTR 1 Syllabus - Penn Physics
... Syllabus suggestions for Bennett et al’s The Cosmic Perspective, 3/e. In addition to the media assets listed below, the web site includes many self-assessment tools for each chapter, such as summaries, quizzes, electronic version of the end-of-chapter questions, flashcards and suggested web links. N ...
... Syllabus suggestions for Bennett et al’s The Cosmic Perspective, 3/e. In addition to the media assets listed below, the web site includes many self-assessment tools for each chapter, such as summaries, quizzes, electronic version of the end-of-chapter questions, flashcards and suggested web links. N ...
Neutron Stars
... km across. This material is crushed together so tightly that gravity overcomes the repulsive force between negatively charged electrons and positively charged protons. The resulting structure of the star is complex, with a solid crystalline crust about one kilometer thick encasing a core of superflu ...
... km across. This material is crushed together so tightly that gravity overcomes the repulsive force between negatively charged electrons and positively charged protons. The resulting structure of the star is complex, with a solid crystalline crust about one kilometer thick encasing a core of superflu ...
DSLR Photometry
... was not built with astronomy in mind. Only bright stars can be seen. For epsilon Aurigae this is not a serious problem. Once the target has been imaged several times one soon learns how, by eye, to offset the camera correctly from a bright star. Similarly one learns the . right movement of the camer ...
... was not built with astronomy in mind. Only bright stars can be seen. For epsilon Aurigae this is not a serious problem. Once the target has been imaged several times one soon learns how, by eye, to offset the camera correctly from a bright star. Similarly one learns the . right movement of the camer ...
neutron star - Chabot College
... • Contrast X-ray bursters with novae on white dwarfs. • Novae occur when hydrogen fusion suddenly ignites on the surface of a white dwarf in a binary system. In contrast, hydrogen fusion is steady on the surface of a neutron star in a binary system. However, the steady hydrogen burning builds up a l ...
... • Contrast X-ray bursters with novae on white dwarfs. • Novae occur when hydrogen fusion suddenly ignites on the surface of a white dwarf in a binary system. In contrast, hydrogen fusion is steady on the surface of a neutron star in a binary system. However, the steady hydrogen burning builds up a l ...
Neutron stars and pulsars
... If a spinning neutron star has a dipole magnetic field and the dipole axis and spin axis are not aligned to each other, it will emit electromagnetic radiation. As rotational energy is extracted, we can obtain an estimate of the neutron-star magnetic field from the measurement of the rate of change i ...
... If a spinning neutron star has a dipole magnetic field and the dipole axis and spin axis are not aligned to each other, it will emit electromagnetic radiation. As rotational energy is extracted, we can obtain an estimate of the neutron-star magnetic field from the measurement of the rate of change i ...
1 Dark matter and dark energy comprise over 90% of the Universe
... and science fiction writers. All these mysteries are theorized and studied, but cannot be physically observed. Theoretical physics is rich with names of exotic elementary particles such as muons, bosons, leptons, up quarks, down quarks and charm quarks. Of particular interest in the search for dark ...
... and science fiction writers. All these mysteries are theorized and studied, but cannot be physically observed. Theoretical physics is rich with names of exotic elementary particles such as muons, bosons, leptons, up quarks, down quarks and charm quarks. Of particular interest in the search for dark ...
THE DEARTH OF UV-BRIGHT STARS IN M32
... by comparing aperture photometry for radii of 2 and 3 pixels and then using the aperture correction of Proffitt (2003) to go from 3 pixels to infinity; for the far-UV photometry, this was done by comparing the PSF-fitting photometry to that in a 3 pixel aperture, and then applying the correction of ...
... by comparing aperture photometry for radii of 2 and 3 pixels and then using the aperture correction of Proffitt (2003) to go from 3 pixels to infinity; for the far-UV photometry, this was done by comparing the PSF-fitting photometry to that in a 3 pixel aperture, and then applying the correction of ...
Distance
... parameters are more accurate than for single star • (b) All stars are of the same age. Star clusters are the only objects that enable direct age estimate, study of the galactic evolution and the star-formation history • (c) All stars have nearly the same chemical composition, and the differences in ...
... parameters are more accurate than for single star • (b) All stars are of the same age. Star clusters are the only objects that enable direct age estimate, study of the galactic evolution and the star-formation history • (c) All stars have nearly the same chemical composition, and the differences in ...
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.