Stars, neutral hydrogen and ionised gas in early
... found eleven sources without measured redshift, ten of which appear only in the catalogue of 2MASS∗ detections. All of them have small optical size compared to IC 4200. Using the H i image derived from our radio observations (Sec.3.2.2), we found that only one of the 2MASS objects, 2MASX J13090029–5 ...
... found eleven sources without measured redshift, ten of which appear only in the catalogue of 2MASS∗ detections. All of them have small optical size compared to IC 4200. Using the H i image derived from our radio observations (Sec.3.2.2), we found that only one of the 2MASS objects, 2MASX J13090029–5 ...
Today in Astronomy 142
... Beyond the Chandrasekhar mass: neutron stars ! The maximum mass calculation involves general relativity and an equation of state that includes the strong interaction. The maximum mass is about 2.2 M⊙; it could not possibly be > 3 M⊙. ! Neutron stars generally have very large magnetic fields (conser ...
... Beyond the Chandrasekhar mass: neutron stars ! The maximum mass calculation involves general relativity and an equation of state that includes the strong interaction. The maximum mass is about 2.2 M⊙; it could not possibly be > 3 M⊙. ! Neutron stars generally have very large magnetic fields (conser ...
Cold dark matter heats up
... gas out of galaxies (Fig. 1). This largely arises from studies of the resonance absorption lines imprinted into spectra by the presence of heavy elements. Consequently, dramatic advances in our knowledge have been made possible by 10-m-class telescope spectroscopy with instruments including the Keck ...
... gas out of galaxies (Fig. 1). This largely arises from studies of the resonance absorption lines imprinted into spectra by the presence of heavy elements. Consequently, dramatic advances in our knowledge have been made possible by 10-m-class telescope spectroscopy with instruments including the Keck ...
The Evryscope: the first full-sky gigapixel-scale telescope Nicholas Law
... Asteroids around white dwarfs Confirmation of long-period TESS single-transit detections ...
... Asteroids around white dwarfs Confirmation of long-period TESS single-transit detections ...
Astronomy 10 Measuring Stars
... By carefully measuring their motions, we find that Sirius A is a bit more than twice the mass of the sun, and Sirius B is a little less than the mass of the sun. Sirius A turns out to be more massive, larger, hotter, and brighter than the sun. Sirius B, however, is about the same mass, much smaller, ...
... By carefully measuring their motions, we find that Sirius A is a bit more than twice the mass of the sun, and Sirius B is a little less than the mass of the sun. Sirius A turns out to be more massive, larger, hotter, and brighter than the sun. Sirius B, however, is about the same mass, much smaller, ...
PPT
... Summary of Advantages of Fourier Transform Spectroscopy Fellgett Advantage – all of the resolution elements for a spectrum are measured simultaneously, thus reducing the time required to derive a spectrum at any given signal-tonoise ratio. Jacquinot Advantage – the large energy throughput of interf ...
... Summary of Advantages of Fourier Transform Spectroscopy Fellgett Advantage – all of the resolution elements for a spectrum are measured simultaneously, thus reducing the time required to derive a spectrum at any given signal-tonoise ratio. Jacquinot Advantage – the large energy throughput of interf ...
20170327_AH_Interference
... Two waves are said to be coherent if they have a constant phase relationship. For two waves travelling in air to have a constant phase relationship, they must have the same frequency and wavelength. At any given point, the phase difference between the two waves will be fixed. For us to see interfere ...
... Two waves are said to be coherent if they have a constant phase relationship. For two waves travelling in air to have a constant phase relationship, they must have the same frequency and wavelength. At any given point, the phase difference between the two waves will be fixed. For us to see interfere ...
Imaging scanning tunneling microscope
... The prospect of creating photonic devices based on surface plasmon propagation is attracting increasing attention.1–5 The motivation has been to create miniaturized optics that would enable higher bandwidth optical computing, all-optical interconnects for telecommunications, or even ‘‘nano-lasers.’’ ...
... The prospect of creating photonic devices based on surface plasmon propagation is attracting increasing attention.1–5 The motivation has been to create miniaturized optics that would enable higher bandwidth optical computing, all-optical interconnects for telecommunications, or even ‘‘nano-lasers.’’ ...
How will the universe end?
... if no ionization or proton decay for black dwarfs and planets, they may quantum-tunnel into solid iron – it may either evaporate or quantum-tunnel into bhs which radiate away within 10^100000000000000000000000000 years particle density will go to zero – each particle will be cut off from the rest by ...
... if no ionization or proton decay for black dwarfs and planets, they may quantum-tunnel into solid iron – it may either evaporate or quantum-tunnel into bhs which radiate away within 10^100000000000000000000000000 years particle density will go to zero – each particle will be cut off from the rest by ...
20_LectureOutline
... • When fusion ceases in the core, it begins to collapse and heat. Hydrogen fusion starts in the shell surrounding the core. • The helium core begins to heat up; as long as the star is at least 0.25 solar masses, the helium will get hot enough that fusion (to carbon) will start. • As the core collaps ...
... • When fusion ceases in the core, it begins to collapse and heat. Hydrogen fusion starts in the shell surrounding the core. • The helium core begins to heat up; as long as the star is at least 0.25 solar masses, the helium will get hot enough that fusion (to carbon) will start. • As the core collaps ...
Photon diffraction
... The difference between waves and nanowaves is defined only by wavelength, microwaves belong to electromagnetic waves. Photons are nanowaves, photon beams aren’ t electromagnetic waves and can have constant or variable intensity. Microwaves utilize the frequency band (3GHz – 3x103 GHz) and the wavele ...
... The difference between waves and nanowaves is defined only by wavelength, microwaves belong to electromagnetic waves. Photons are nanowaves, photon beams aren’ t electromagnetic waves and can have constant or variable intensity. Microwaves utilize the frequency band (3GHz – 3x103 GHz) and the wavele ...
- dragicaminic.info
... Push-pull alkenes, consisting of one or two electron-donating groups (EDG) at the terminus of the C=C bond and one or two electron-withdrawing groups (EWG) at the other terminus, have been widely studied on the account of their low rotational barrier around the C-C double bond. This is attributed to ...
... Push-pull alkenes, consisting of one or two electron-donating groups (EDG) at the terminus of the C=C bond and one or two electron-withdrawing groups (EWG) at the other terminus, have been widely studied on the account of their low rotational barrier around the C-C double bond. This is attributed to ...
Stellar-Mass Black Holes and Ultraluminous X
... Most BHXRBs are, however, low-mass x-ray the outburst through Fig. 2, top; a sketch of likely lines (which can be fluorescence lines from neutral binaries, which are almost certainly much older geometries in the soft, intermediate/flaring, and or ionized iron) in this phase. This iron line can than ...
... Most BHXRBs are, however, low-mass x-ray the outburst through Fig. 2, top; a sketch of likely lines (which can be fluorescence lines from neutral binaries, which are almost certainly much older geometries in the soft, intermediate/flaring, and or ionized iron) in this phase. This iron line can than ...
Transiting planets from WASP
... October 2013. For all spectroscopic observations, radial velocities (RVs) were computed using the weighted cross-correlation technique described in Pepe et al. (2002). These RVs are presented in Tables 1–3. For each star, RV variations were detected with periods similar to those found in the WASP ph ...
... October 2013. For all spectroscopic observations, radial velocities (RVs) were computed using the weighted cross-correlation technique described in Pepe et al. (2002). These RVs are presented in Tables 1–3. For each star, RV variations were detected with periods similar to those found in the WASP ph ...
night watch - Warren Astronomical Society
... -2The best method for determining the radius of Pluto, as it is for Neptune, is to observe a stellar occultation. It was predicted that Pluto would pass near a 15th magnitude star in 1965, and so the passage was observed very closely by several observatories to see if the star would be occulted. We ...
... -2The best method for determining the radius of Pluto, as it is for Neptune, is to observe a stellar occultation. It was predicted that Pluto would pass near a 15th magnitude star in 1965, and so the passage was observed very closely by several observatories to see if the star would be occulted. We ...
poster
... many cluster members are found around the reddening slope in the CMD, indicating that their color changes are caused by variable extinction (reddening). In contrast, only cluster members have slopes where the source becomes more blue as it fades (bluening). A change in the inner disk radius can caus ...
... many cluster members are found around the reddening slope in the CMD, indicating that their color changes are caused by variable extinction (reddening). In contrast, only cluster members have slopes where the source becomes more blue as it fades (bluening). A change in the inner disk radius can caus ...
Practical Exercises in Physical Chemistry
... the corresponding, marked bottles. Clean up the working place at the end. a) Measure the extinction of the aqueous solution of Mn(III) tris-oxalate thermally equilibrated at 18 0C at 365 nm, 405 nm, 436 nm, 492 nm, 546 nm, 578 nm and 623 nm after 60 s of the solution preparation. b) Select the emiss ...
... the corresponding, marked bottles. Clean up the working place at the end. a) Measure the extinction of the aqueous solution of Mn(III) tris-oxalate thermally equilibrated at 18 0C at 365 nm, 405 nm, 436 nm, 492 nm, 546 nm, 578 nm and 623 nm after 60 s of the solution preparation. b) Select the emiss ...
Camelopardalis-Better-Know-A-Constellation
... Can be seen in binoculars from country skies, sometimes fools comet hunters. NGC 2403 possesses about 100 emission regions as well as 27 variable stars. Larger instruments will reveal many of these regions that seem to take on likeliness to M33. Three supernovae have been spotted in this galaxy, one ...
... Can be seen in binoculars from country skies, sometimes fools comet hunters. NGC 2403 possesses about 100 emission regions as well as 27 variable stars. Larger instruments will reveal many of these regions that seem to take on likeliness to M33. Three supernovae have been spotted in this galaxy, one ...
Fiber Optics Communications
... • This is equivalent to all light energy of the sun’s radiation in 1047 years, if all radiation is of lo=1 mm. • In 1970, Corning Glass Works did successfully grow fused silica fiber with loss less than 20dB/km • Bell labs made successfully the room temperature continuous wave AlGaAs (Aluminum Galli ...
... • This is equivalent to all light energy of the sun’s radiation in 1047 years, if all radiation is of lo=1 mm. • In 1970, Corning Glass Works did successfully grow fused silica fiber with loss less than 20dB/km • Bell labs made successfully the room temperature continuous wave AlGaAs (Aluminum Galli ...
STC-Scripting Guide for Celestia
... “What is a spectral class and what does it tell about a star and its properties?”. It might be useful for beginners, but if you already know what types of stars you want to create, you can skip them. Stars are obviously emitting light, otherwise we wouldn’t be able to see them, but they do not only ...
... “What is a spectral class and what does it tell about a star and its properties?”. It might be useful for beginners, but if you already know what types of stars you want to create, you can skip them. Stars are obviously emitting light, otherwise we wouldn’t be able to see them, but they do not only ...
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.