Using Parallax to Measure the Distance of Stars
... distances, with radar being useful nearby (for example, the Moon), and the Hubble Law being useful at the farthest distances. In this exercise, we investigate the use of the trigonometric or measured parallax method to determine distances. Even when observed with the largest telescopes, stars are st ...
... distances, with radar being useful nearby (for example, the Moon), and the Hubble Law being useful at the farthest distances. In this exercise, we investigate the use of the trigonometric or measured parallax method to determine distances. Even when observed with the largest telescopes, stars are st ...
Time, quantum and information
... the sun hit the chlorine-37 nuclei, they occasionally produced argon-37 nuclei, which were extracted and counted by their radioactive decay. The results were published in 1968 [11]. However, these were neutrinos with higher energies which are not produced in the main branch of the proton-proton cycl ...
... the sun hit the chlorine-37 nuclei, they occasionally produced argon-37 nuclei, which were extracted and counted by their radioactive decay. The results were published in 1968 [11]. However, these were neutrinos with higher energies which are not produced in the main branch of the proton-proton cycl ...
Entropy Production of Stars
... variational principles proves to be important both for the foundation of nonequilibrium physics and for calculations: from heat-conduction problems to the solution of the Boltzmann equation [1–4]. It should be noted that the quantity of entropy production is convenient from the standpoint of theory ...
... variational principles proves to be important both for the foundation of nonequilibrium physics and for calculations: from heat-conduction problems to the solution of the Boltzmann equation [1–4]. It should be noted that the quantity of entropy production is convenient from the standpoint of theory ...
IAU 29th General Assembly
... We now strongly encourage observation with relatively inexpensive video equipment to better quantify the observations, and obtain at least approximate photometric information using specially-developed software for analyzing video records, esp. Limovie from Japan and Tangra from Australia We encourag ...
... We now strongly encourage observation with relatively inexpensive video equipment to better quantify the observations, and obtain at least approximate photometric information using specially-developed software for analyzing video records, esp. Limovie from Japan and Tangra from Australia We encourag ...
6-1 - Piscataway High School
... This is not a frivolous question. In answering it, you will discover how small atoms really are, and you will see how powerful physics and mathematics can be as a way to understand nature. Many scientific arguments are convincing because they have the precision of mathematics. To begin, assume that t ...
... This is not a frivolous question. In answering it, you will discover how small atoms really are, and you will see how powerful physics and mathematics can be as a way to understand nature. Many scientific arguments are convincing because they have the precision of mathematics. To begin, assume that t ...
PPT presentation
... Obtain additional data on SMC PNe: luminosity-limited sample Compare the nebular & stellar “evolutionary clocks” to understand the AGB->PN transition time Use the PN population as a tool to understand the early epoch of star formation of the host galaxy ...
... Obtain additional data on SMC PNe: luminosity-limited sample Compare the nebular & stellar “evolutionary clocks” to understand the AGB->PN transition time Use the PN population as a tool to understand the early epoch of star formation of the host galaxy ...
Zapartas_deMink_Izzard_AA_2017
... Most massive stars, the progenitors of core-collapse supernovae, are in close binary systems and may interact with their companion through mass transfer or merging. We undertake a population synthesis study to compute the delay-time distribution of core-collapse supernovae, that is, the supernova ra ...
... Most massive stars, the progenitors of core-collapse supernovae, are in close binary systems and may interact with their companion through mass transfer or merging. We undertake a population synthesis study to compute the delay-time distribution of core-collapse supernovae, that is, the supernova ra ...
Rapid Rotation of Low-Mass Red Giants Using APOKASC: A
... Spuriously high measurements of broadening (individual measurements more than five times the values measured for the other two wavelength sections) arose in a few cases where the template spectrum was already broader than the observed spectrum or did not fit well. These values were removed and the m ...
... Spuriously high measurements of broadening (individual measurements more than five times the values measured for the other two wavelength sections) arose in a few cases where the template spectrum was already broader than the observed spectrum or did not fit well. These values were removed and the m ...
Pulsars as Astrophysical Laboratories for Nuclear and Particle Physics
... magnetized neutron stars in pulsars are surrounded by a plasma, the so-called magnetosphere, in which via plasma processes the electromagnetic radiation from pulsars is generated. The magnetic fields near the surface of neutron stars in compact X-ray sources play an important role in channeling the ...
... magnetized neutron stars in pulsars are surrounded by a plasma, the so-called magnetosphere, in which via plasma processes the electromagnetic radiation from pulsars is generated. The magnetic fields near the surface of neutron stars in compact X-ray sources play an important role in channeling the ...
Evolution of the atomic and molecular gas content of galaxies
... gas and much lower cosmic H2 fraction over the entire redshift range probed than the pressure based recipe. These strong differences in Hi mass function and cosmic density between the two recipes are driven by low mass galaxies (log (M∗ /M⊙ ) 6 7) residing in low mass halos (log (Mvir /M⊙ ) 6 10). B ...
... gas and much lower cosmic H2 fraction over the entire redshift range probed than the pressure based recipe. These strong differences in Hi mass function and cosmic density between the two recipes are driven by low mass galaxies (log (M∗ /M⊙ ) 6 7) residing in low mass halos (log (Mvir /M⊙ ) 6 10). B ...
PARALLAX – IT`S SIMPLE! Abstract
... parallax angle of star Cygnus 61 was very small, some tenths of arcsecond and hard to measure. Even for the nearest star, Alpha Centauri the annual parallax is less than 1 arcsecond (less than 1/3600 of one arc degree). Until recent time the annual parallaxes of only a few hundreds of stars were kno ...
... parallax angle of star Cygnus 61 was very small, some tenths of arcsecond and hard to measure. Even for the nearest star, Alpha Centauri the annual parallax is less than 1 arcsecond (less than 1/3600 of one arc degree). Until recent time the annual parallaxes of only a few hundreds of stars were kno ...
Constellation ARA
... 15' in diameter, and lies approximately 4,300 light years from Earth. The two hottest stars in the cluster are responsible for the illumination of NGC 6188, an emission nebula also located in Ara constellation. NGC 6379 is a bright globular star cluster located three degrees to the northeast of Beta ...
... 15' in diameter, and lies approximately 4,300 light years from Earth. The two hottest stars in the cluster are responsible for the illumination of NGC 6188, an emission nebula also located in Ara constellation. NGC 6379 is a bright globular star cluster located three degrees to the northeast of Beta ...
H 2 O, OH, SiO, NH 3 and CH 3 OH
... [proh-toh-stahr] an early stage in the evolution of a star, after the beginning of the collapse of the gas cloud from which it is formed, but before sufficient contraction has occurred to permit initiation of nuclear reactions at its core. ...
... [proh-toh-stahr] an early stage in the evolution of a star, after the beginning of the collapse of the gas cloud from which it is formed, but before sufficient contraction has occurred to permit initiation of nuclear reactions at its core. ...
Observing Orion
... Horsehead is caused mostly by thick dust blocking the glow. This is very difficult object and until relatively recently it was thought to be unobservable by amateurs. It requires very clear skies and usually a large scope. A Hydrogen Beta filter is also generally required, although some references s ...
... Horsehead is caused mostly by thick dust blocking the glow. This is very difficult object and until relatively recently it was thought to be unobservable by amateurs. It requires very clear skies and usually a large scope. A Hydrogen Beta filter is also generally required, although some references s ...
PEGASUS, THE FLYING HORSE Pegasus is a constellation in the
... with a redshift of 0.0027. It was discovered by musician-astronomer William Herschel in 1784 and was later one of the first nebulous objects to be described as "spiral" by William Parsons. Another of Pegasus's galaxies is NGC 7742, a Type 2 Seyfert galaxy. Located at a distance of 77 million light-y ...
... with a redshift of 0.0027. It was discovered by musician-astronomer William Herschel in 1784 and was later one of the first nebulous objects to be described as "spiral" by William Parsons. Another of Pegasus's galaxies is NGC 7742, a Type 2 Seyfert galaxy. Located at a distance of 77 million light-y ...
Formation Process of the Circumstellar Disk
... the star formation process, and the dynamics of disks may determine the mass accretion rate onto the protostar that determines the final stellar mass. In addition, planets are considered to form in the circumstellar (or protoplanetary) disk, and their formation process strongly depends on disk proper ...
... the star formation process, and the dynamics of disks may determine the mass accretion rate onto the protostar that determines the final stellar mass. In addition, planets are considered to form in the circumstellar (or protoplanetary) disk, and their formation process strongly depends on disk proper ...
Stellar evolution models for Z = 0.0001 to 0.03
... criterion (Shaviv & Salpeter 1973). From the naive approach of mixing-length theory the intuitive name ‘overshooting’ is used for such a process, but we must keep in mind that any enhanced mixing can be described in this way. In any case, enhanced mixing enlarges the reservoir of hydrogen within rea ...
... criterion (Shaviv & Salpeter 1973). From the naive approach of mixing-length theory the intuitive name ‘overshooting’ is used for such a process, but we must keep in mind that any enhanced mixing can be described in this way. In any case, enhanced mixing enlarges the reservoir of hydrogen within rea ...
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.