Notes (PowerPoint)
... o Stars, dust, gas, mostly empty space o Groups of galaxies: clusters (us: Local Group) ...
... o Stars, dust, gas, mostly empty space o Groups of galaxies: clusters (us: Local Group) ...
Space astrometry 3: Gaia: scientific rationale, principles, and data analysis
... torque models, etc), as well as instrument calibration terms (evolve only slowly with time), and slit ambiguities • also corrected for aberration and GR light-bending • the efficient solution of the large system of equations was not trivial (Cholesky sparse matrix factorisation) 2. an arbitrary orig ...
... torque models, etc), as well as instrument calibration terms (evolve only slowly with time), and slit ambiguities • also corrected for aberration and GR light-bending • the efficient solution of the large system of equations was not trivial (Cholesky sparse matrix factorisation) 2. an arbitrary orig ...
Gaps
... • Fast HB rotation, although maybe not present in all clusters, is a fairly common feature. ...
... • Fast HB rotation, although maybe not present in all clusters, is a fairly common feature. ...
Supplemental Educational Support Materials
... gravitational force that attracts all other masses. The more massive the object, the stronger the gravitational force. The closer objects are to each other, the stronger the gravitational attraction. ...
... gravitational force that attracts all other masses. The more massive the object, the stronger the gravitational force. The closer objects are to each other, the stronger the gravitational attraction. ...
Understanding Mass-Loss and the Late Evolution of Intermediate
... conduction cooling might explain some cases (Steffen et al. 2008), it fails for the brightest and beststudied case, BD+303639 (Yu et al. 2009) for which high-resolution X-ray spectra reveal the elemental abundances of the shock-superheated gas and allow us to associate it with the undiluted, nucleos ...
... conduction cooling might explain some cases (Steffen et al. 2008), it fails for the brightest and beststudied case, BD+303639 (Yu et al. 2009) for which high-resolution X-ray spectra reveal the elemental abundances of the shock-superheated gas and allow us to associate it with the undiluted, nucleos ...
award
... points According to the nebular hypothesis, which of the following sequences of events are chronologically correct? Solar nebula, interstellar cloud, collisions between planetesimals, accretion, planets. Interstellar cloud, solar nebula, accretion, collisions between planetesimals, planets. Interste ...
... points According to the nebular hypothesis, which of the following sequences of events are chronologically correct? Solar nebula, interstellar cloud, collisions between planetesimals, accretion, planets. Interstellar cloud, solar nebula, accretion, collisions between planetesimals, planets. Interste ...
Seminar 2
... The galaxy population starts to deviate significantly at z as low as 0.3 and at z ~1 the morphology is so peculiar that about 30 % of the galaxies cannot be fitted into the classical Hubble tuning fork system. Although the internal structure and morphology show significant changes with redshift, the ...
... The galaxy population starts to deviate significantly at z as low as 0.3 and at z ~1 the morphology is so peculiar that about 30 % of the galaxies cannot be fitted into the classical Hubble tuning fork system. Although the internal structure and morphology show significant changes with redshift, the ...
Neutron stars - Institut de Physique Nucleaire de Lyon
... prediction of the neutronization with increasing density. F.Zwicky [“On collapsed neutron stars,” Astrophys. J. 88 (1938) 522] – estimate of the maximum binding energy of a neutron star; – difference between Mb and M; – “enormous gravitational red shifts” R.C.Tolman; J.R.Oppenheimer & G.M.Volkof ...
... prediction of the neutronization with increasing density. F.Zwicky [“On collapsed neutron stars,” Astrophys. J. 88 (1938) 522] – estimate of the maximum binding energy of a neutron star; – difference between Mb and M; – “enormous gravitational red shifts” R.C.Tolman; J.R.Oppenheimer & G.M.Volkof ...
the formation of giant molecular clouds
... identify where, or if, they all turned up in this thesis. It was very satisfying to work with someone who always saw things so clearly. The numerical work presented here would have been impossible without the help of Lars Hernquist and Neal Katz, who provided a version of the TREESPH code in which t ...
... identify where, or if, they all turned up in this thesis. It was very satisfying to work with someone who always saw things so clearly. The numerical work presented here would have been impossible without the help of Lars Hernquist and Neal Katz, who provided a version of the TREESPH code in which t ...
RS Oph
... recurrent novae (Nr). These stars are novae where more than one outburst has been observed and appear to be intermediate in class between the classical novae (single major outburst) and dwarf novae (frequent minor outbursts). RS Oph is an interacting binary star system with a particularly long orbit ...
... recurrent novae (Nr). These stars are novae where more than one outburst has been observed and appear to be intermediate in class between the classical novae (single major outburst) and dwarf novae (frequent minor outbursts). RS Oph is an interacting binary star system with a particularly long orbit ...
Subrahmanyan Chandrasekhar
... Traveling by ship in 1930 to begin his Ph.D. at Cambridge University, he had calculated a number. In his honor this number is now called The Chandrasekhar Limit: its value is 1.4. This number determines the fate of stars. Chandrasekhar published his result in 1931 in the Astrophysical Journal. In se ...
... Traveling by ship in 1930 to begin his Ph.D. at Cambridge University, he had calculated a number. In his honor this number is now called The Chandrasekhar Limit: its value is 1.4. This number determines the fate of stars. Chandrasekhar published his result in 1931 in the Astrophysical Journal. In se ...
The Universe
... Initially called the “primeval atom”, George Lemaitre hypothesized that the universe began as a small entity that expanded into the present-day universe according to the Hubble relation Refinements over several decades transformed the primeval atom hypothesis of Lemaitre into the Big Bang theory tha ...
... Initially called the “primeval atom”, George Lemaitre hypothesized that the universe began as a small entity that expanded into the present-day universe according to the Hubble relation Refinements over several decades transformed the primeval atom hypothesis of Lemaitre into the Big Bang theory tha ...
Dark Matter Concept Questions
... c) every galaxy that has been examined for dark matter. d) many, but not all, galaxies that have been examined for dark matter. 5. Evidence for dark matter comes from observations of a) the orbit of the Moon around Earth and gravitational lensing. b) the orbits of stars and gravitational lensing. c) ...
... c) every galaxy that has been examined for dark matter. d) many, but not all, galaxies that have been examined for dark matter. 5. Evidence for dark matter comes from observations of a) the orbit of the Moon around Earth and gravitational lensing. b) the orbits of stars and gravitational lensing. c) ...
Fall Semester Final Study Guide 2014 Chapter 1 Introduction to
... 2. How long do scientists think the sun will live? 3. What info can be derived from the color of a star? 4. Why is a light year a more useful measurement in astronomy than a meter is? 5. T/F Extremely high temperatures and pressured are necessary for fusion reactions to take place in stars. 6. T/F T ...
... 2. How long do scientists think the sun will live? 3. What info can be derived from the color of a star? 4. Why is a light year a more useful measurement in astronomy than a meter is? 5. T/F Extremely high temperatures and pressured are necessary for fusion reactions to take place in stars. 6. T/F T ...
Determining the Nature of a Double Star: The Law of Conservation
... masses for the components (0.37 and 0.29 M?), the projected separation (930 AU) and the expected semimajor axis (1,172 AU), I calculated a maximum orbital velocity of 0.87 km s-1 using equation (6). Using equation (15b), I calculated an escape velocity of 1.12 km s-1. As in the last example, this pa ...
... masses for the components (0.37 and 0.29 M?), the projected separation (930 AU) and the expected semimajor axis (1,172 AU), I calculated a maximum orbital velocity of 0.87 km s-1 using equation (6). Using equation (15b), I calculated an escape velocity of 1.12 km s-1. As in the last example, this pa ...
Lecture 2. Thermal evolution and surface emission of
... prototypes of a different subpopulation of NSs born with low magnetic field (< few 1011 G) and relatively long spin periods (few tenths of a second). These NSs are relatively hot, and probably not very rare. Surprisingly, we do not see objects of this type in our vicinity. In the solar neighbourhood ...
... prototypes of a different subpopulation of NSs born with low magnetic field (< few 1011 G) and relatively long spin periods (few tenths of a second). These NSs are relatively hot, and probably not very rare. Surprisingly, we do not see objects of this type in our vicinity. In the solar neighbourhood ...
Formation of the Solar System Section 28.1
... slow, but it gradually accelerates and the cloud becomes much denser at its center. • the cloud spins faster as it contracts, due to centripetal force. • and the cloud becomes flattened. • the cloud becomes a rotating disk with a dense concentration of matter at the center. • the Sun formed in the c ...
... slow, but it gradually accelerates and the cloud becomes much denser at its center. • the cloud spins faster as it contracts, due to centripetal force. • and the cloud becomes flattened. • the cloud becomes a rotating disk with a dense concentration of matter at the center. • the Sun formed in the c ...
arXiv:astro-ph/0508448v1 22 Aug 2005
... massive enough to collapse to a black hole rather than a neutron star (Fryer 1999, van den Heuvel et al. 2000). The level of wind ...
... massive enough to collapse to a black hole rather than a neutron star (Fryer 1999, van den Heuvel et al. 2000). The level of wind ...
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.