First detection of helium emissions in RR Lyrae⋆
... where strong shock waves are nevertheless present in their atmosphere. Only recently have the observation of He I emission lines in 10 RRab stars and the detection of very weak He II emission in 3 of them been reported. All these stars are Blazhko stars, while helium emission has never been detected ...
... where strong shock waves are nevertheless present in their atmosphere. Only recently have the observation of He I emission lines in 10 RRab stars and the detection of very weak He II emission in 3 of them been reported. All these stars are Blazhko stars, while helium emission has never been detected ...
An Oort cloud origin for the high-inclination, high
... Levison et al., 2006) have demonstrated that it is possible for Jupiter and Saturn to extract objects from the Oort cloud, and decrease these planetesimals’ semi-major axis (a) to several tens of AU. This works as follows: an Oort cloud object that passes through perihelion among the giant planets m ...
... Levison et al., 2006) have demonstrated that it is possible for Jupiter and Saturn to extract objects from the Oort cloud, and decrease these planetesimals’ semi-major axis (a) to several tens of AU. This works as follows: an Oort cloud object that passes through perihelion among the giant planets m ...
Sample pages 1 PDF
... emission nebulae and planetary nebulae. Of course there is a downside to wintertime observing: the weather! Or more specifically, the freezing cold weather characteristic of this time of year. To get the most out of wintertime observing you’ll need to be wearing suitably warm clothing. This will usu ...
... emission nebulae and planetary nebulae. Of course there is a downside to wintertime observing: the weather! Or more specifically, the freezing cold weather characteristic of this time of year. To get the most out of wintertime observing you’ll need to be wearing suitably warm clothing. This will usu ...
MUFASA: The assembly of the red sequence
... validate such simulations against observations of the growth of star-forming galaxies across cosmic time – clearly, if the properties of the star-forming progenitors of massive galaxies are incompatible with data, then it casts doubt on the validity of the predictions for massive galaxies. Fortunate ...
... validate such simulations against observations of the growth of star-forming galaxies across cosmic time – clearly, if the properties of the star-forming progenitors of massive galaxies are incompatible with data, then it casts doubt on the validity of the predictions for massive galaxies. Fortunate ...
Constellation Detection
... We need to process the original template image before we can use it as a template and quantify the template as data structures for further detection. First, Every single template image is first binarized. We pick different colors to efficiently distinguish stars and connection lines (stars are repre ...
... We need to process the original template image before we can use it as a template and quantify the template as data structures for further detection. First, Every single template image is first binarized. We pick different colors to efficiently distinguish stars and connection lines (stars are repre ...
A Zoo of Galaxies - Portsmouth Research Portal
... To say our understanding of the “zoo” of galaxies that are found in our Universe has changed a lot over the last century or two is a bit of an understatement. In 1845 the state of the art picture of an external galaxy, was an image of M51, or the Whirlpool galaxy drawn by William Parsons, Third Earl ...
... To say our understanding of the “zoo” of galaxies that are found in our Universe has changed a lot over the last century or two is a bit of an understatement. In 1845 the state of the art picture of an external galaxy, was an image of M51, or the Whirlpool galaxy drawn by William Parsons, Third Earl ...
The physics of neutron stars
... the mass M ∼ M⊙ have the radius R ∼ 104 km, which is comparable to Earth’s radius but almost 1000 times greater than the radius of a neutron star [3]. Therefore, the matter density in their interiors is less than one-thousandth of ρ0 . On the other hand, according to theoretical models, quark stars ...
... the mass M ∼ M⊙ have the radius R ∼ 104 km, which is comparable to Earth’s radius but almost 1000 times greater than the radius of a neutron star [3]. Therefore, the matter density in their interiors is less than one-thousandth of ρ0 . On the other hand, according to theoretical models, quark stars ...
Modeling the Point Spread Function Using Principal
... because the PSF continually changes, even by real time thermal fluctuations while an image is being taken. PCA is affected by random noise, but the effects are reduced by using a large collections of images; it can then model the global pattern of changes in the PSF. PCA is a powerful method of mode ...
... because the PSF continually changes, even by real time thermal fluctuations while an image is being taken. PCA is affected by random noise, but the effects are reduced by using a large collections of images; it can then model the global pattern of changes in the PSF. PCA is a powerful method of mode ...
EXPLORING STELLAR EVOLUTION MODELS OF sdB STARS
... classes of stars. Recent detections of g-mode pulsations in evolved He burning stars allow a rare comparison of their internal structure with stellar models. Asteroseismology of subdwarf B (sdB) stars suggests convective cores of 0.22–0.28 Me, 45% of the total stellar mass. Previous studies found s ...
... classes of stars. Recent detections of g-mode pulsations in evolved He burning stars allow a rare comparison of their internal structure with stellar models. Asteroseismology of subdwarf B (sdB) stars suggests convective cores of 0.22–0.28 Me, 45% of the total stellar mass. Previous studies found s ...
Automated Detection and Analysis of Meteor Events Using Nightly
... them from being used for calibration. Meteor Theory: There are chunks of matter in space called meteoroids, ranging in size from less than a millimeter to tens of meters across. Once they hit Earth’s atmosphere they heat up and begin to vaporize; these are called meteors more popularly known as shoo ...
... them from being used for calibration. Meteor Theory: There are chunks of matter in space called meteoroids, ranging in size from less than a millimeter to tens of meters across. Once they hit Earth’s atmosphere they heat up and begin to vaporize; these are called meteors more popularly known as shoo ...
Variability of young solar-type stars: Spot cycles, rotation
... akin to the 11 year spot cycle of the Sun, and other possible regularities present in the distribution of the starspots. Measurements of the chromospheric emission level by high resolution spectroscopy will furthermore directly provide useful estimates of the activity level of a star. Despite the fa ...
... akin to the 11 year spot cycle of the Sun, and other possible regularities present in the distribution of the starspots. Measurements of the chromospheric emission level by high resolution spectroscopy will furthermore directly provide useful estimates of the activity level of a star. Despite the fa ...
the next decade - Lowell Observatory
... Long-term, synoptic observations of the spectroscopic and photometric behavior of Sunlike stars has been performed at select observing sites for nearly 40 years. Most of the spectroscopic data have been collected at the Mount Wilson Observatory (MWO), beginning in March 1966 with Olin Wilson’s initi ...
... Long-term, synoptic observations of the spectroscopic and photometric behavior of Sunlike stars has been performed at select observing sites for nearly 40 years. Most of the spectroscopic data have been collected at the Mount Wilson Observatory (MWO), beginning in March 1966 with Olin Wilson’s initi ...
Chemical Composition of Selected Metal Poor Stars
... by GalaCtic chemical evolution (chemical enrichment history of our galaxy). Theories of Big Bang nucleosynthesis suggest that, it was mainly hydrogen, helium and little amount of elements upto boron which were synthesized primordially. Other metals (elements heavier than lithium) were formed from th ...
... by GalaCtic chemical evolution (chemical enrichment history of our galaxy). Theories of Big Bang nucleosynthesis suggest that, it was mainly hydrogen, helium and little amount of elements upto boron which were synthesized primordially. Other metals (elements heavier than lithium) were formed from th ...
A STRONGLY MAGNETIZED PULSAR WITHIN THE GRASP OF THE MILKY... SUPERMASSIVE BLACK HOLE Rea ,
... the flux and pulse profile variability typical of radio magnetars. The DM derived from Parkes observations at 10 cm, DM = 1750 ± 50 pc cm−3 , is the highest ever measured for a radio pulsar, and implies a distance of ∼8.3 kpc (Cordes & Lazio 2002). The relatively high Ė ∼ 5 × 1033 erg s−1 of SGR J1 ...
... the flux and pulse profile variability typical of radio magnetars. The DM derived from Parkes observations at 10 cm, DM = 1750 ± 50 pc cm−3 , is the highest ever measured for a radio pulsar, and implies a distance of ∼8.3 kpc (Cordes & Lazio 2002). The relatively high Ė ∼ 5 × 1033 erg s−1 of SGR J1 ...
WG4: Nuclear Astrophysics
... Cosmic gas is collected by gravitational attraction into higher density regions, to eventually form stars of different masses. These stars are stabilised against further gravitational concentration by the release of nuclear binding energy in their interiors. Depending on the total mass of the star d ...
... Cosmic gas is collected by gravitational attraction into higher density regions, to eventually form stars of different masses. These stars are stabilised against further gravitational concentration by the release of nuclear binding energy in their interiors. Depending on the total mass of the star d ...
The molecular disk surrounding the protostellar binary L1551 IRS5
... results of Hogerheijde et al. (1997). There is also a third peak or strong extended wing emission in some of the HCO+ spectra which we identify with the outflow signature of L1551 IRS5. In addition we also note the more puzzling presence of red-shifted material to the west of IRS5 where we find the ...
... results of Hogerheijde et al. (1997). There is also a third peak or strong extended wing emission in some of the HCO+ spectra which we identify with the outflow signature of L1551 IRS5. In addition we also note the more puzzling presence of red-shifted material to the west of IRS5 where we find the ...
The Probability and Effects of an Asteroid Impact with Earth
... V filter relative to that for the dark-adapted eye. ...
... V filter relative to that for the dark-adapted eye. ...
ertan et al 11cesme
... AXP/SGRs indeed require strong magnetic fields. We proposed in a series of earlier papers on fallback disk model that the magnetar fields powering the bursts could be in higher multipole components of the magnetic field which are localized close to the surface of the star rather than in the large sc ...
... AXP/SGRs indeed require strong magnetic fields. We proposed in a series of earlier papers on fallback disk model that the magnetar fields powering the bursts could be in higher multipole components of the magnetic field which are localized close to the surface of the star rather than in the large sc ...
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.