Magnetized massive stars as magnetar progenitors
... out of a sample of eight. The existence of strong magnetic fields on OB stars even appears somewhat overwhelming in contrast to the very few magnetars that have been discovered so far. With the assumption that neutron stars form during the collapse of massive progenitors in the Galactic disc with 8 ...
... out of a sample of eight. The existence of strong magnetic fields on OB stars even appears somewhat overwhelming in contrast to the very few magnetars that have been discovered so far. With the assumption that neutron stars form during the collapse of massive progenitors in the Galactic disc with 8 ...
azu_etd_13224_sip1_m
... What physical processes and sources of material contribute to exoplanet compositions? Specifically, what roles do the protoplanetary disk composition and structure, and host star abundances play in the different stages of planet formation? In this thesis, beginning with a brief literature review in ...
... What physical processes and sources of material contribute to exoplanet compositions? Specifically, what roles do the protoplanetary disk composition and structure, and host star abundances play in the different stages of planet formation? In this thesis, beginning with a brief literature review in ...
Constraints on Long-Period Planets from an L
... is adaptive optics (AO), which allows 6-10m ground-based telescopes to obtain diffraction limited IR images several times sharper than those from HST, despite Earth’s turbulent atmosphere. Theoretical models of giant planets indicate that such telescopes should be capable of detecting self-luminous ...
... is adaptive optics (AO), which allows 6-10m ground-based telescopes to obtain diffraction limited IR images several times sharper than those from HST, despite Earth’s turbulent atmosphere. Theoretical models of giant planets indicate that such telescopes should be capable of detecting self-luminous ...
6th Grade The Theoretical Beginning of the Universe / Big Bang
... Counteracting the effect that dark matter has in slowing the universe's expansion, dark energy has been discovered...and is seen to be speeding up the expansion of the universe. While the expansion of nearby stars is slowing down...like a ball would if thrown straight up in the air, the expansion of ...
... Counteracting the effect that dark matter has in slowing the universe's expansion, dark energy has been discovered...and is seen to be speeding up the expansion of the universe. While the expansion of nearby stars is slowing down...like a ball would if thrown straight up in the air, the expansion of ...
spatially resolved star formation history of milky way satellites
... satellites there is another galaxy similar in size than the Milky Way, called Andromeda or Messier 31 (M31), which, as the Milky Way, has its own satellites. These two big galaxies and their own satellites form a self-gravitating association called the Local Group, and hence, the satellite galaxies ...
... satellites there is another galaxy similar in size than the Milky Way, called Andromeda or Messier 31 (M31), which, as the Milky Way, has its own satellites. These two big galaxies and their own satellites form a self-gravitating association called the Local Group, and hence, the satellite galaxies ...
Astronomy and Astrophysics (ASTRO) Iowa State University – 2013-2014 1
... combines material on common naked-eye phenomena, such as daily and seasonal variations in the sky, with information on how these helped navigators determine where they are on Earth. The course "lectures" are on-line, interactive units with build in exercises, hands-on (offline) activities and layers ...
... combines material on common naked-eye phenomena, such as daily and seasonal variations in the sky, with information on how these helped navigators determine where they are on Earth. The course "lectures" are on-line, interactive units with build in exercises, hands-on (offline) activities and layers ...
Detached WD/BD binaries as progenitors of CVs
... • Need to spectroscopically confirm remaining substellar candidates • Determine periods and secondary masses for candidate close binaries – Optical/IR photometric variability c.f. WD0137-349 – Radial velocities of brown dwarfs from Halpha emission (WD0137-349) or near-IR spectroscopy (GD1400) ...
... • Need to spectroscopically confirm remaining substellar candidates • Determine periods and secondary masses for candidate close binaries – Optical/IR photometric variability c.f. WD0137-349 – Radial velocities of brown dwarfs from Halpha emission (WD0137-349) or near-IR spectroscopy (GD1400) ...
HR4796A_telesco - University of Florida Astronomy
... concluded that the disk has a roughly 40 AU-radius central hole in it. This conclusion was subsequently confirmed by the first direct images of the disk at 20 m (J98; K98) and, more recently, by NICMOS images at 1-2 m (Schneider et al. 1999; see below). We see the hole directly in our 18 m image ...
... concluded that the disk has a roughly 40 AU-radius central hole in it. This conclusion was subsequently confirmed by the first direct images of the disk at 20 m (J98; K98) and, more recently, by NICMOS images at 1-2 m (Schneider et al. 1999; see below). We see the hole directly in our 18 m image ...
galaxies2_1_complete - Astronomy & Astrophysics Group
... In any case, mass distribution of neighbouring halos may overlap: Galaxies which appear as separate luminous objects may have formed from a single dark matter halo – the result of an earlier halo merger ...
... In any case, mass distribution of neighbouring halos may overlap: Galaxies which appear as separate luminous objects may have formed from a single dark matter halo – the result of an earlier halo merger ...
Edwin Hubble (1889
... Writing in his doctoral thesis in 1917, Hubble noted that catalogs already included some 17,000 small, faint nebulous objects that could ultimately be resolved into groupings of stars. Perhaps 150,000 were within the reach of existing telescopes. Yet, he wrote, "Extremely little is known of the natu ...
... Writing in his doctoral thesis in 1917, Hubble noted that catalogs already included some 17,000 small, faint nebulous objects that could ultimately be resolved into groupings of stars. Perhaps 150,000 were within the reach of existing telescopes. Yet, he wrote, "Extremely little is known of the natu ...
DIRECT OBSERVATION OF GRAVITATIONAL WAVES DIRECT
... Gravitational Waves as Signals from the Universe Gravitational waves are ‘ripples’ in the fabric of spacetime caused by accelerating masses such as colliding black holes, exploding stars, and even the birth of the universe itself. Albert Einstein predicted the existence of gravitational waves in 191 ...
... Gravitational Waves as Signals from the Universe Gravitational waves are ‘ripples’ in the fabric of spacetime caused by accelerating masses such as colliding black holes, exploding stars, and even the birth of the universe itself. Albert Einstein predicted the existence of gravitational waves in 191 ...
the Colours of rainbow the Brook
... Ans. A galaxy is a vast collection of stars, dust and gases held together by mutual gravitational force. There are about 1011 galaxies having different sizes and regular and irregular shapes in the universe and each galaxy contain about 10" stars. We belong to a galaxy called Milky Way or Akash Gang ...
... Ans. A galaxy is a vast collection of stars, dust and gases held together by mutual gravitational force. There are about 1011 galaxies having different sizes and regular and irregular shapes in the universe and each galaxy contain about 10" stars. We belong to a galaxy called Milky Way or Akash Gang ...
Cosmic Rays near Proxima Centauri b
... Sadovski 2017). Stellar cosmic rays (SCR) were considered in many papers (Tabataba-Vakili et al. 2016; Atri 2017; Struminsky & Sadovski 2017) as an important factor of space weather in a habitable zone of star. Since the details of SCR spectrum is unknown to model the effect of SCR one may use spect ...
... Sadovski 2017). Stellar cosmic rays (SCR) were considered in many papers (Tabataba-Vakili et al. 2016; Atri 2017; Struminsky & Sadovski 2017) as an important factor of space weather in a habitable zone of star. Since the details of SCR spectrum is unknown to model the effect of SCR one may use spect ...
A dearth of dark matter in strong gravitational lenses
... Sakellariadou & Yusaf 2009; Leier et al. 2011). This problem is complicated by the possibility of contamination – whether or not distant lenses are truly isolated or lying within groups or clusters – and by the uncertainty of the M/L of the underlying stellar population. With respect to this second ...
... Sakellariadou & Yusaf 2009; Leier et al. 2011). This problem is complicated by the possibility of contamination – whether or not distant lenses are truly isolated or lying within groups or clusters – and by the uncertainty of the M/L of the underlying stellar population. With respect to this second ...
Validation of Twelve Small Kepler Transiting Planets in the
... stars and to validate the signals. In the interim, three of them that are in systems with five candidates each (KOI0571.05 = Kepler-186 f, KOI-1422.04 = Kepler-296 f, and KOI-1422.05 = Kepler-296 e) were the subject of recent studies by others. KOI-1422.04 and KOI-1422.05 were announced as planets b ...
... stars and to validate the signals. In the interim, three of them that are in systems with five candidates each (KOI0571.05 = Kepler-186 f, KOI-1422.04 = Kepler-296 f, and KOI-1422.05 = Kepler-296 e) were the subject of recent studies by others. KOI-1422.04 and KOI-1422.05 were announced as planets b ...
IAU GA, Prague, Aug 2006 - Spanish Virtual Observatory
... • Building a census of substellar objects implies the discovery of a statistically significant number of them through queries that combine attributes available from different archives. • This is an approach out of the scope of the "classical" methodology but that perfectly fits into the Virtual Obse ...
... • Building a census of substellar objects implies the discovery of a statistically significant number of them through queries that combine attributes available from different archives. • This is an approach out of the scope of the "classical" methodology but that perfectly fits into the Virtual Obse ...
Stellar Evolution Nucleosynthesis
... • Double-shell burning ends with a pulse that ejects the H and He into space as a planetary nebula. • The PN phase is brief (~104 years) • The core left behind becomes a white dwarf. © 2007 Pearson Education Inc., publishing as Pearson Addison-Wesley ...
... • Double-shell burning ends with a pulse that ejects the H and He into space as a planetary nebula. • The PN phase is brief (~104 years) • The core left behind becomes a white dwarf. © 2007 Pearson Education Inc., publishing as Pearson Addison-Wesley ...
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.