Note - HKU Physics
... close to and hence can be well approximated by a region in thermodynamic equilibrium. Thus, it makes sense to talk about thermodynamic variables such as temperature, density and pressure in these regions. This approximation greatly simplifies our analysis and serves as the starting point to the stud ...
... close to and hence can be well approximated by a region in thermodynamic equilibrium. Thus, it makes sense to talk about thermodynamic variables such as temperature, density and pressure in these regions. This approximation greatly simplifies our analysis and serves as the starting point to the stud ...
Millisecond Pulsar Binaries at Transition
... There should be more out there, but not identified Indeed, there is a group so-called Very Faint X-ray Binaries (VFXBs; e.g., Heinke et al. 2014), with quiescenct Lx~10^33 erg/s The point is these VFXBs could be considered as the transitional systems too if the neutron stars do not accrete and thus ...
... There should be more out there, but not identified Indeed, there is a group so-called Very Faint X-ray Binaries (VFXBs; e.g., Heinke et al. 2014), with quiescenct Lx~10^33 erg/s The point is these VFXBs could be considered as the transitional systems too if the neutron stars do not accrete and thus ...
preprint, pdf version - LESIA
... Associate researcher at INAF/Osservatorio Astronomico di Torino, Strada Osservatorio 20, 10025 Pino Torinese (To), Italy. ...
... Associate researcher at INAF/Osservatorio Astronomico di Torino, Strada Osservatorio 20, 10025 Pino Torinese (To), Italy. ...
Lecture 6: Multiple stars
... that the favoured lengthscale for fragmentation should be about 100au exactly where we see an excess. This is at least some evidence that our understanding of core collapse is correct. (A similar argument can be applied from disc fragmentation which should occur only at >100au.) ...
... that the favoured lengthscale for fragmentation should be about 100au exactly where we see an excess. This is at least some evidence that our understanding of core collapse is correct. (A similar argument can be applied from disc fragmentation which should occur only at >100au.) ...
PDF only - at www.arxiv.org.
... real (and imagined) astronomical spectacular events, it is no surprise that the 12 BC to 2 BC time interval has more than a dozen. The general class of astronomical answers has always had problems with a variety of aspects of the Nativity narrative. In particular, the astronomical answers have neve ...
... real (and imagined) astronomical spectacular events, it is no surprise that the 12 BC to 2 BC time interval has more than a dozen. The general class of astronomical answers has always had problems with a variety of aspects of the Nativity narrative. In particular, the astronomical answers have neve ...
Chapter 17
... mass can have different compositions. Most important: Stars do not move along the main sequence! Once they reach it, they are in equilibrium, and do not move until their fuel begins to run ...
... mass can have different compositions. Most important: Stars do not move along the main sequence! Once they reach it, they are in equilibrium, and do not move until their fuel begins to run ...
Evidence for a signature of the galactic bar in the solar neighbourhood
... Teff , [M/H] and Mv with precisions varying with the temperature and gravity ranges. For late G dwarfs, the internal errors are of 20-40 K on Teff , 0.03-0.05 dex on [M/H] and 0.15 on Mv , for single stars. Radial velocities were acquired by Grenon with CORAVEL at Haute-Provence Observatory for NLTT ...
... Teff , [M/H] and Mv with precisions varying with the temperature and gravity ranges. For late G dwarfs, the internal errors are of 20-40 K on Teff , 0.03-0.05 dex on [M/H] and 0.15 on Mv , for single stars. Radial velocities were acquired by Grenon with CORAVEL at Haute-Provence Observatory for NLTT ...
Month - University of Saskatchewan
... NLC season began on May 22nd and will eventually end on August 12th. Noctilucent clouds are mysterious icy structures that appear at the top of the atmosphere 80 kilometers up. Likely, these clouds are there all year around, coming and going every few days, but solar illumination circumstances make ...
... NLC season began on May 22nd and will eventually end on August 12th. Noctilucent clouds are mysterious icy structures that appear at the top of the atmosphere 80 kilometers up. Likely, these clouds are there all year around, coming and going every few days, but solar illumination circumstances make ...
The white dwarf population within 40 pc of the Sun
... A key point in the comparison of a synthetic population of white dwarfs with the observed data is the implementation of the observational selection criteria in the theoretical samples. To account for the observational biases with a high degree of fidelity, we implemented the selection criteria emplo ...
... A key point in the comparison of a synthetic population of white dwarfs with the observed data is the implementation of the observational selection criteria in the theoretical samples. To account for the observational biases with a high degree of fidelity, we implemented the selection criteria emplo ...
Abstract - UChicago High Energy Physics
... Neutrinos shape the physical phenomena surrounding compact object mergers, from the dynamics of the disk or hypermassive-neutron star itself [1–4], to the energetic jets, e.g. [5] that may from them. Neutrinos also play an important role in the nucleosynthesis that takes place in and around disks [6 ...
... Neutrinos shape the physical phenomena surrounding compact object mergers, from the dynamics of the disk or hypermassive-neutron star itself [1–4], to the energetic jets, e.g. [5] that may from them. Neutrinos also play an important role in the nucleosynthesis that takes place in and around disks [6 ...
ESOP August 2013
... Astronomical Research Institute of Thailand, [email protected] • He worked before for a long time at the European Southern Observatory, where he still makes most of his observations • Most observations are recorded in the infrared, allowing higher S/N and even some daytime observations • Observatio ...
... Astronomical Research Institute of Thailand, [email protected] • He worked before for a long time at the European Southern Observatory, where he still makes most of his observations • Most observations are recorded in the infrared, allowing higher S/N and even some daytime observations • Observatio ...
$doc.title
... Table 1 lists the 18 objects studied in this project with a number of important characteristics. The spectral type is a kind of “mean” value for what is found in the literature (using Vizier; Ochsenbein et al., 2000)1. The carbon star TW Hor is an exception in this sample. We include it because it w ...
... Table 1 lists the 18 objects studied in this project with a number of important characteristics. The spectral type is a kind of “mean” value for what is found in the literature (using Vizier; Ochsenbein et al., 2000)1. The carbon star TW Hor is an exception in this sample. We include it because it w ...
White dwarf binaries
... Flickering found in UX UMa (Linnell 1949, 1950) 71 s pulsations in DQ Her (Walker 1956) Identification of WD as primary in CVs AE Aqr secondary filling Roche lobe (Crawford and Kraft 1956) All CVs are binaries undergoing mass transfer onto WD (Kraft 1962) Accretion disk responsible for outburst ligh ...
... Flickering found in UX UMa (Linnell 1949, 1950) 71 s pulsations in DQ Her (Walker 1956) Identification of WD as primary in CVs AE Aqr secondary filling Roche lobe (Crawford and Kraft 1956) All CVs are binaries undergoing mass transfer onto WD (Kraft 1962) Accretion disk responsible for outburst ligh ...
Chapter17.2
... carbon in a shell around the carbon core, and hydrogen fuses to helium in a shell around the helium layer. • This double shell–burning stage never reaches equilibrium—fusion rate periodically spikes upward in a series of thermal pulses. • With each spike, convection dredges carbon up from core and t ...
... carbon in a shell around the carbon core, and hydrogen fuses to helium in a shell around the helium layer. • This double shell–burning stage never reaches equilibrium—fusion rate periodically spikes upward in a series of thermal pulses. • With each spike, convection dredges carbon up from core and t ...
Galileo
... countless more which have never before been seen, exposing these plainly to the eye in numbers ten times exceeding the old and familiar stars. It is a very beautiful thing, and most gratifying to the sight, to behold the body of the moon, distant from us almost sixty earthly radii, 4 as if it were n ...
... countless more which have never before been seen, exposing these plainly to the eye in numbers ten times exceeding the old and familiar stars. It is a very beautiful thing, and most gratifying to the sight, to behold the body of the moon, distant from us almost sixty earthly radii, 4 as if it were n ...
Galileo`s The Starry Messenger
... countless more which have never before been seen, exposing these plainly to the eye in numbers ten times exceeding the old and familiar stars. It is a very beautiful thing, and most gratifying to the sight, to behold the body of the moon, distant from us almost sixty earthly radii,4 as if it were no ...
... countless more which have never before been seen, exposing these plainly to the eye in numbers ten times exceeding the old and familiar stars. It is a very beautiful thing, and most gratifying to the sight, to behold the body of the moon, distant from us almost sixty earthly radii,4 as if it were no ...
PDF format
... more compact than a white dwarf. b) True, neutron stars had been observed before at optical wavelengths but it was only after they were found to pulsate at radio wavelengths that astronomers realized their nature. c) False, the existence of neutron stars was predicted by theory and it was widely a ...
... more compact than a white dwarf. b) True, neutron stars had been observed before at optical wavelengths but it was only after they were found to pulsate at radio wavelengths that astronomers realized their nature. c) False, the existence of neutron stars was predicted by theory and it was widely a ...
ExTRaSOLaR pLaNeTS
... available to study different types of galaxies and stars, which have enabled astronomers to develop models and theories on star and galaxy formation and to place our own galaxy and star amongst them. The Solar System is 4.6 billion years old, but there is no way to measure directly how it formed and ...
... available to study different types of galaxies and stars, which have enabled astronomers to develop models and theories on star and galaxy formation and to place our own galaxy and star amongst them. The Solar System is 4.6 billion years old, but there is no way to measure directly how it formed and ...
Ursa Minor
Ursa Minor (Latin: ""Smaller She-Bear"", contrasting with Ursa Major), also known as the Little Bear, is a constellation in the northern sky. Like the Great Bear, the tail of the Little Bear may also be seen as the handle of a ladle, hence the name Little Dipper. It was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and remains one of the 88 modern constellations. Ursa Minor has traditionally been important for navigation, particularly by mariners, due to Polaris being the North Star.Polaris, the brightest star in the constellation, is a yellow-white supergiant and the brightest Cepheid variable star in the night sky, ranging from apparent magnitude 1.97 to 2.00. Beta Ursae Minoris, also known as Kochab, is an aging star that has swollen and cooled to become an orange giant with an apparent magnitude of 2.08, only slightly fainter than Polaris. Kochab and magnitude 3 Gamma Ursae Minoris have been called the ""guardians of the pole star"". Planets have been detected orbiting four of the stars, including Kochab. The constellation also contains an isolated neutron star—Calvera—and H1504+65, the hottest white dwarf yet discovered with a surface temperature of 200,000 K.