Properties of dust - McDonald Observatory
... organized into galaxies. What is the origin of stars, planets, and galaxies? The origins of all of these are hidden from view if we use visible light. Stars form in clouds of molecules and dust. The dust blocks visible light. Planets form in disks around the forming stars; planets like Earth form FR ...
... organized into galaxies. What is the origin of stars, planets, and galaxies? The origins of all of these are hidden from view if we use visible light. Stars form in clouds of molecules and dust. The dust blocks visible light. Planets form in disks around the forming stars; planets like Earth form FR ...
New interpretations of XPS spectra of nickel metal and oxides
... has been previously accepted to explain main line and satellite profiles in 2p spectra of Cu and Mn oxides [9]. Quantum chemical cluster model calculations for NiO6 [10] confirm the lowest final state with cd9L character. A satellite arising from the overlap of the frozen ground state (with the core el ...
... has been previously accepted to explain main line and satellite profiles in 2p spectra of Cu and Mn oxides [9]. Quantum chemical cluster model calculations for NiO6 [10] confirm the lowest final state with cd9L character. A satellite arising from the overlap of the frozen ground state (with the core el ...
Constraints on the Birth Aggregate of the Solar System
... For completeness, we note that thermally pulsing asymptotic giant branch stars have also been suggested as an enrichment source (see Brusso, Gallino, and Wasserburg 1999), but the probability that such a star is associated with a molecular cloud is relatively low (Kastner and Myers 1994). We also kn ...
... For completeness, we note that thermally pulsing asymptotic giant branch stars have also been suggested as an enrichment source (see Brusso, Gallino, and Wasserburg 1999), but the probability that such a star is associated with a molecular cloud is relatively low (Kastner and Myers 1994). We also kn ...
Raman Scattering in Solids
... continuously. Raman scattering can be used to study both types of transitions. In the following, we shall give some examples. Raman himself studied the first-order transition of quartz from the α to the β phase at ~ 570°C.8 He found a specific phonon mode at 220 cm-1 decreasing in frequency as the t ...
... continuously. Raman scattering can be used to study both types of transitions. In the following, we shall give some examples. Raman himself studied the first-order transition of quartz from the α to the β phase at ~ 570°C.8 He found a specific phonon mode at 220 cm-1 decreasing in frequency as the t ...
The low dark matter content of the lenticular galaxy NGC 3998
... fibre position. We found the FWHM to vary smoothly as a function of fibre position, with values ranging from 1.26 to 1.63 Å. Our maximum FWHM corresponds to an intrinsic instrumental velocity dispersion of σ = 41 km s−1 . We constructed sky frames from sky exposures taken before and after a given ga ...
... fibre position. We found the FWHM to vary smoothly as a function of fibre position, with values ranging from 1.26 to 1.63 Å. Our maximum FWHM corresponds to an intrinsic instrumental velocity dispersion of σ = 41 km s−1 . We constructed sky frames from sky exposures taken before and after a given ga ...
On the onset of runaway stellar collisions in dense star clusters I
... years, which is roughly the time required for a collision product to reach the main-sequence. Stellar collisions also play an important role in the formation of stellar exotica in young star clusters, such as blue stragglers. If cluster properties are such that the runaway phase is not possible, ste ...
... years, which is roughly the time required for a collision product to reach the main-sequence. Stellar collisions also play an important role in the formation of stellar exotica in young star clusters, such as blue stragglers. If cluster properties are such that the runaway phase is not possible, ste ...
Full Programme and Abstracts - UK Exoplanet community meeting
... Earth is the best studied planet we know. A century’s work on terrestrial samples has interrogated 90% of its history, and revealed the physics of processes from the formation of the core to the rise of atmospheric oxygen. This detailed understanding can benefit our perspective of exo-planetary syst ...
... Earth is the best studied planet we know. A century’s work on terrestrial samples has interrogated 90% of its history, and revealed the physics of processes from the formation of the core to the rise of atmospheric oxygen. This detailed understanding can benefit our perspective of exo-planetary syst ...
UK Exoplanet community meeting 2017
... Earth is the best studied planet we know. A century’s work on terrestrial samples has interrogated 90% of its history, and revealed the physics of processes from the formation of the core to the rise of atmospheric oxygen. This detailed understanding can benefit our perspective of exo-planetary syst ...
... Earth is the best studied planet we know. A century’s work on terrestrial samples has interrogated 90% of its history, and revealed the physics of processes from the formation of the core to the rise of atmospheric oxygen. This detailed understanding can benefit our perspective of exo-planetary syst ...
Doppler imaging of AB Doradus using the Li I 6708 line
... measurements in two ways. The continuum level at the blue wing of the Li line profile is hard to determine accurately (see Fig. 2), due to a strong Fel line at 6705.12 A. Another Fel line at 6710.31 A. blends with the red wing of the rotationally broadened Li line profile and hence might cause the L ...
... measurements in two ways. The continuum level at the blue wing of the Li line profile is hard to determine accurately (see Fig. 2), due to a strong Fel line at 6705.12 A. Another Fel line at 6710.31 A. blends with the red wing of the rotationally broadened Li line profile and hence might cause the L ...
Low-Complexity Velocity Estimation in High
... shifts below 0.1 kHz are assumed to be insignificant. Over the range of Doppler frequencies, 2.5 µs of IFD recording time implies that we would have less than 0.0075 periods of the Doppler shift. The short time of the acquisition and the noise of the recorded IFD severely limit the resolution of STF ...
... shifts below 0.1 kHz are assumed to be insignificant. Over the range of Doppler frequencies, 2.5 µs of IFD recording time implies that we would have less than 0.0075 periods of the Doppler shift. The short time of the acquisition and the noise of the recorded IFD severely limit the resolution of STF ...
Read more - Spectromatch
... of lighting intensity and lighting sources. In reality the patient will never always be under just one illuminant. Figure 6 shows just how much variation there is between commonly found lighting, outside, at home, shopping or at work. ...
... of lighting intensity and lighting sources. In reality the patient will never always be under just one illuminant. Figure 6 shows just how much variation there is between commonly found lighting, outside, at home, shopping or at work. ...
white dwarfs and the age of the universe
... the uniformity of the models with log(L/L⊙) ∼ < 8 × 107 years for any model, its influence time necessary to reach this value is ∼ in the total cooling time is negligible. • Fluid cooling: −1.5 ≥ log(L/L⊙ ) ≥ −3 The main source of energy is the gravothermal one. Since the plasma is not very strongly ...
... the uniformity of the models with log(L/L⊙) ∼ < 8 × 107 years for any model, its influence time necessary to reach this value is ∼ in the total cooling time is negligible. • Fluid cooling: −1.5 ≥ log(L/L⊙ ) ≥ −3 The main source of energy is the gravothermal one. Since the plasma is not very strongly ...
Stellar radii from long-baseline interferometry
... They are a visual binary pair with a very long orbital period (≈ 700 yrs). In 1838, 61 Cyg became the first star whose distance from Earth was estimated accurately (Bessel 1838), shortly before Procyon’s, and it is now known with an exquisite accuracy. Its proper motion of more than 5 per year, firs ...
... They are a visual binary pair with a very long orbital period (≈ 700 yrs). In 1838, 61 Cyg became the first star whose distance from Earth was estimated accurately (Bessel 1838), shortly before Procyon’s, and it is now known with an exquisite accuracy. Its proper motion of more than 5 per year, firs ...
multiwavelength observations of the gamma-ray
... Observational studies of blazars have so far mostly focused on bright, flaring states of blazars. This is the consequence of observational constraints which make detailed measurements of spectral and variability features in X-rays and γ -rays difficult ...
... Observational studies of blazars have so far mostly focused on bright, flaring states of blazars. This is the consequence of observational constraints which make detailed measurements of spectral and variability features in X-rays and γ -rays difficult ...
A Comparison of Electromagnetic Wave and Radiative Transfer
... x¢ > 20 there is around a 5 % difference in Q¢ and a negligible difference in Q1 regardless of the value of 7-d. The correspondence between the two models in a large-particle limit is to be expected, but the value of x¢ beyond which this correspondence obtains could not have been determined without ...
... x¢ > 20 there is around a 5 % difference in Q¢ and a negligible difference in Q1 regardless of the value of 7-d. The correspondence between the two models in a large-particle limit is to be expected, but the value of x¢ beyond which this correspondence obtains could not have been determined without ...
Credit: X-ray: NASA/CXC/UMass/D. Wang et al.; Optical: Caltech/SSC/S.Stolovy
... Giant flares from Sgr A* illuminate molecular clouds ...
... Giant flares from Sgr A* illuminate molecular clouds ...
Magnetars: properties, origin and evolution
... Magnetars are the most variable sources among the different classes of isolated neutron stars: their characterizing property is the emission, in the X-ray and soft γ-ray range, of powerful short bursts which often reach super-Eddington luminosities. More rarely, they also emit intermediate and giant ...
... Magnetars are the most variable sources among the different classes of isolated neutron stars: their characterizing property is the emission, in the X-ray and soft γ-ray range, of powerful short bursts which often reach super-Eddington luminosities. More rarely, they also emit intermediate and giant ...
Why do we Still Believe in Newton`s Law? Facts, Myths and Methods
... has been achieved in the question as to what the related quantities ‘dark matter’ and ‘dark energy’ do really mean. A soulmate of King Alfonso, the astronomer Aguirre [2] commented: ‘these new discoveries... have been achieved at the expense of simplicity’. The question why nature comes up with a b ...
... has been achieved in the question as to what the related quantities ‘dark matter’ and ‘dark energy’ do really mean. A soulmate of King Alfonso, the astronomer Aguirre [2] commented: ‘these new discoveries... have been achieved at the expense of simplicity’. The question why nature comes up with a b ...
DOC - IVOA
... 4.3 Representation of spectral types and luminosity classes Pairs of digits for TT, tt, and LL may range from 00 through 99. These 100 numbers are cells denoting spectral types, subtypes, and luminosity classes respectively, as in the Morgan-Keenan (MK) system, - and beyond. For all four major class ...
... 4.3 Representation of spectral types and luminosity classes Pairs of digits for TT, tt, and LL may range from 00 through 99. These 100 numbers are cells denoting spectral types, subtypes, and luminosity classes respectively, as in the Morgan-Keenan (MK) system, - and beyond. For all four major class ...
Astronomical spectroscopy
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other hot celestial objects. Spectroscopy can be used to derive many properties of distant stars and galaxies, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements.