Giant planet and brown dwarf formation
... Both types of objects raise their own fundamental questions and generate their own debates. Do brown dwarfs form like stars, as a natural extension of the stellar formation process in the substellar regime? Or are brown dwarfs issued from a different formation scenario and represent a distinctive cl ...
... Both types of objects raise their own fundamental questions and generate their own debates. Do brown dwarfs form like stars, as a natural extension of the stellar formation process in the substellar regime? Or are brown dwarfs issued from a different formation scenario and represent a distinctive cl ...
the solar neighborhood. xi. the trigonometric parallax of scr
... the maximum reference star distance correctly, several different selections were made, and the average rms errors (the mean of all the errors from all the plates) from the local linear plate fit were noted along with the number of reference stars. The results are shown in Table 3. We chose the maxim ...
... the maximum reference star distance correctly, several different selections were made, and the average rms errors (the mean of all the errors from all the plates) from the local linear plate fit were noted along with the number of reference stars. The results are shown in Table 3. We chose the maxim ...
M81/M82/NGC3077
... The two galaxies have indeed passed each other not long ago. The line-of-sight separation is 0.27 Mpc. Calculated using the velocity difference gives a time scale of approximately 1x109 years, consistent with the enhanced star ...
... The two galaxies have indeed passed each other not long ago. The line-of-sight separation is 0.27 Mpc. Calculated using the velocity difference gives a time scale of approximately 1x109 years, consistent with the enhanced star ...
PowerPoint Presentation - 18. The Bizarre Stellar Graveyard
... • …are the leftover cores from high-mass star supernova explosions • If the core < 3 M, it will stop collapsing and be held up by neutron degeneracy pressure • Neutron stars are very dense -- 1.5 M with a diameter of 10 to 20 km • They rotate very rapidly: Period = 0.03 to 4 sec • Their magnetic f ...
... • …are the leftover cores from high-mass star supernova explosions • If the core < 3 M, it will stop collapsing and be held up by neutron degeneracy pressure • Neutron stars are very dense -- 1.5 M with a diameter of 10 to 20 km • They rotate very rapidly: Period = 0.03 to 4 sec • Their magnetic f ...
Stars - Emera Astronomy Center
... Looking for fun and interesting space activities? The planetarium staff has prepared a collection of materials we call the Cosmic Classroom for you to use before and/or after your visit. These materials are entirely for use at your own discretion and are not intended to be required curricula or a pr ...
... Looking for fun and interesting space activities? The planetarium staff has prepared a collection of materials we call the Cosmic Classroom for you to use before and/or after your visit. These materials are entirely for use at your own discretion and are not intended to be required curricula or a pr ...
The Science Case for SPICA Far
... to measure. One of the very few available techniques – far-infrared/(sub)millimeter polarimetry of dust emission – has been applied to the study of magnetic fields in molecular cloud cores using suborbital telescopes. Combining this approach with the sensitivity of large, cold far-infrared space tel ...
... to measure. One of the very few available techniques – far-infrared/(sub)millimeter polarimetry of dust emission – has been applied to the study of magnetic fields in molecular cloud cores using suborbital telescopes. Combining this approach with the sensitivity of large, cold far-infrared space tel ...
Chapter 2 Simulation Methodology 2.1 The generation of cosmological initial conditions
... final protostar, typically on the order of a few solar masses for a calculation of this type. Given that Mdm = Ωcdm ρc (Lbox /Ngrid )3 M /h (where Lbox is the box size in Mpc/h and Ngrid is the number of grid cells along one edge of the box), this results in a volume with approximately 10243 grid c ...
... final protostar, typically on the order of a few solar masses for a calculation of this type. Given that Mdm = Ωcdm ρc (Lbox /Ngrid )3 M /h (where Lbox is the box size in Mpc/h and Ngrid is the number of grid cells along one edge of the box), this results in a volume with approximately 10243 grid c ...
sections 4-6 instructor notes
... modern detectors, cross-correlation techniques are more typically used. It should be obvious that the procedure is subject to some uncertainties. Early-type stars, for example, have very few spectral lines, and those that are found in their spectra are often quite broad and difficult to measure accu ...
... modern detectors, cross-correlation techniques are more typically used. It should be obvious that the procedure is subject to some uncertainties. Early-type stars, for example, have very few spectral lines, and those that are found in their spectra are often quite broad and difficult to measure accu ...
Galaxy Powerpoint Notes
... The creation of galaxies is a very mysterious topic as it is uncertain of how the universe was created. The most common theory however, is the theory of the Big Bang, which states that the universe expanded from a very dense state and continues to expand today. Another common prediction of how galax ...
... The creation of galaxies is a very mysterious topic as it is uncertain of how the universe was created. The most common theory however, is the theory of the Big Bang, which states that the universe expanded from a very dense state and continues to expand today. Another common prediction of how galax ...
Computer Modeling the Line of Sight Column Densities of Polars
... Polars are a type of CV that has a strong magnetic field around 100 million times earths magnetic field. The plasma is not allowed to form an accretion disc because it follows the magnetic field lines. The stream takes a more direct path toward the white dwarf. The high speeds of the impacting parti ...
... Polars are a type of CV that has a strong magnetic field around 100 million times earths magnetic field. The plasma is not allowed to form an accretion disc because it follows the magnetic field lines. The stream takes a more direct path toward the white dwarf. The high speeds of the impacting parti ...
Pulsating Stars: Stars that Breathe
... An HST image of a Cepheid in the outer regions of M100, a spiral galaxy belonging to the Virgo Cluster. Correlating the Cepheid distance with the galaxy’s redshift will help constrain the Hubble constant, and thus provide an estimate for the age and size of the Universe. You can read more about rece ...
... An HST image of a Cepheid in the outer regions of M100, a spiral galaxy belonging to the Virgo Cluster. Correlating the Cepheid distance with the galaxy’s redshift will help constrain the Hubble constant, and thus provide an estimate for the age and size of the Universe. You can read more about rece ...
MS-SCI-PS-Unit 4 -- Chapter 15- Stars, Galaxies
... atmosphere. To detect these wavelengths, astronomers have placed telescopes in space. Some space telescopes are designed to detect visible light or infrared radiation, since Earth's atmosphere also interferes with the transmission of these forms of radiation. The Hubble Space Telescope is a reflecti ...
... atmosphere. To detect these wavelengths, astronomers have placed telescopes in space. Some space telescopes are designed to detect visible light or infrared radiation, since Earth's atmosphere also interferes with the transmission of these forms of radiation. The Hubble Space Telescope is a reflecti ...
chapter18StarDeath
... – A ball of neutrons left over from a massive star supernova and supported by neutron degeneracy pressure ...
... – A ball of neutrons left over from a massive star supernova and supported by neutron degeneracy pressure ...
Lecture 9: Radiation processes Almost all astronomical information
... important because most stars and galaxies emit a significant fraction of their energy in this part of the spectrum. (This is not true for objects significantly colder than stars - e.g. planets, interstellar dust and molecular clouds, which emit in the infrared or at longer wavelengths - or significa ...
... important because most stars and galaxies emit a significant fraction of their energy in this part of the spectrum. (This is not true for objects significantly colder than stars - e.g. planets, interstellar dust and molecular clouds, which emit in the infrared or at longer wavelengths - or significa ...
Unit 13―The “Fixed” Stars
... or portion of a diagram, that says that telescopes can “make the invisible visible.” 186. Classification by magnitudes. Stars that can only be made visible by means of a telescope are generally called telescopic and those that can be visible to the unaided eye are called lucid. (Have you ever heard ...
... or portion of a diagram, that says that telescopes can “make the invisible visible.” 186. Classification by magnitudes. Stars that can only be made visible by means of a telescope are generally called telescopic and those that can be visible to the unaided eye are called lucid. (Have you ever heard ...
Chapter 18 The Bizarre Stellar Graveyard What is a white dwarf
... • How were neutron stars discovered? – Beams of radiation from a rotating neutron star sweep through space like lighthouse beams, making them appear to pulse – Observations of these pulses were the first evidence for neutron stars ...
... • How were neutron stars discovered? – Beams of radiation from a rotating neutron star sweep through space like lighthouse beams, making them appear to pulse – Observations of these pulses were the first evidence for neutron stars ...
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.