Astronomy and the Coal Age of Alabama
... The Big Dipper would have looked virtually the same to the ancient Egyptians, but 100,000 years ago it looked different. It will further lose its familiar shape in the future. Its 7 bright stars are not all at the same distance. This kind of thing can’t be extrapolated too far backward or forward i ...
... The Big Dipper would have looked virtually the same to the ancient Egyptians, but 100,000 years ago it looked different. It will further lose its familiar shape in the future. Its 7 bright stars are not all at the same distance. This kind of thing can’t be extrapolated too far backward or forward i ...
HOW HIGH ARE PULSAR MOUNTAINS?
... calculate the amplitude with which we would observe them at Earth. This is called the "spin-down limit". If we can achieve detector sensitivities that allow searches to reach below this limit then we are probing interesting new territory, where gravitational wave signals could be detectable. There a ...
... calculate the amplitude with which we would observe them at Earth. This is called the "spin-down limit". If we can achieve detector sensitivities that allow searches to reach below this limit then we are probing interesting new territory, where gravitational wave signals could be detectable. There a ...
Closed Loop Performance
... improved on, by a significant margin with <95122 nm rms achieved (800-1000 Hz, 400 modes) (by almost 2x lower in rms wavefront error). • Science requirement of <250 nm rms error for faint (R=13) guide stars is met and improved on with typically ~221 nm rms (200 Hz, 150 modes) is achieved. ...
... improved on, by a significant margin with <95122 nm rms achieved (800-1000 Hz, 400 modes) (by almost 2x lower in rms wavefront error). • Science requirement of <250 nm rms error for faint (R=13) guide stars is met and improved on with typically ~221 nm rms (200 Hz, 150 modes) is achieved. ...
Astronomy 112: The Physics of Stars Class 18 Notes: Neutron Stars
... We’re not sure exactly how strong the magnetic field is before the supernova, but we can take the observed magnetic fields of white dwarfs as a rough guess, since the massive star core is basically an iron white dwarf before it collapses. These cover a very wide range, but typical values are ∼ 105 g ...
... We’re not sure exactly how strong the magnetic field is before the supernova, but we can take the observed magnetic fields of white dwarfs as a rough guess, since the massive star core is basically an iron white dwarf before it collapses. These cover a very wide range, but typical values are ∼ 105 g ...
2.3 Peculiar galaxies
... due to the mass of all the other stars in the galaxy, and this force determines the motion of the star. In other words, each star responds to the galaxy overall. Because isolated galaxies are nice symmetrical things, that net force is usually towards the centre of the galaxy, and the star does a nea ...
... due to the mass of all the other stars in the galaxy, and this force determines the motion of the star. In other words, each star responds to the galaxy overall. Because isolated galaxies are nice symmetrical things, that net force is usually towards the centre of the galaxy, and the star does a nea ...
TAP702-0: Red shift - Teaching Advanced Physics
... The wavelengths of spectral lines emitted by atoms in an astronomical object are often increased compared to a similar source in the laboratory. We see the same pattern of lines (so we can recognize the elements from which they arise), but the whole pattern is shifted to longer wavelengths. The colo ...
... The wavelengths of spectral lines emitted by atoms in an astronomical object are often increased compared to a similar source in the laboratory. We see the same pattern of lines (so we can recognize the elements from which they arise), but the whole pattern is shifted to longer wavelengths. The colo ...
Lecture7_2014_v2
... • Observed data (today) are most consistent with theory that all the planets formed out of the same cloud of gas at the same time • Some of the wide variety seen within the existing planets may be due to chance events like collisions • Discovery of planet-forming disks and actual planets around othe ...
... • Observed data (today) are most consistent with theory that all the planets formed out of the same cloud of gas at the same time • Some of the wide variety seen within the existing planets may be due to chance events like collisions • Discovery of planet-forming disks and actual planets around othe ...
Project 3. Colour in Astronomy
... Another reason why you obtain lower temperatures is that the Interstellar space is not a perfect vacuum. The interstellar medium (ISM) comprises cold neutral gas (H I at ≈ 70 K), warm neutral gas (H I at 6,000 K) and hot ionised plasma (H II at 106 K) primarily located in the plane of the galaxy ...
... Another reason why you obtain lower temperatures is that the Interstellar space is not a perfect vacuum. The interstellar medium (ISM) comprises cold neutral gas (H I at ≈ 70 K), warm neutral gas (H I at 6,000 K) and hot ionised plasma (H II at 106 K) primarily located in the plane of the galaxy ...
IAU 29th General Assembly
... •FM 2 – Astronomical Heritage: Progressing the UNESCO–IAU Initiative •FM 3 – Scholarly Publication in Astronomy: Evolution or Revolution? •FM 4 – Planetary Nebulae as Probes of Galactic Structure and Evolution •FM 5 – The Legacy of Planck •FM 6 – X-ray Surveys of the Hot and Energetic Cosmos •FM 7 – ...
... •FM 2 – Astronomical Heritage: Progressing the UNESCO–IAU Initiative •FM 3 – Scholarly Publication in Astronomy: Evolution or Revolution? •FM 4 – Planetary Nebulae as Probes of Galactic Structure and Evolution •FM 5 – The Legacy of Planck •FM 6 – X-ray Surveys of the Hot and Energetic Cosmos •FM 7 – ...
SRMP Stars Curriculum - American Museum of Natural History
... For this activity, the brighter the light, the better. Hand out one diffraction grating per student. Explain that these act like prisms and break up light into its constituent parts. Turn the dimmable light on low, and turn off the classroom lights. Ask students to view the light through the diffrac ...
... For this activity, the brighter the light, the better. Hand out one diffraction grating per student. Explain that these act like prisms and break up light into its constituent parts. Turn the dimmable light on low, and turn off the classroom lights. Ask students to view the light through the diffrac ...
The Stellar Population Synthesis Technique Charlie Conroy Princeton
... The timescale for molecular cloud (MC) disruption, tesc, is not wellconstrained observationally Plausibly ranges from 106.5 < tesc < 107.5 yrs – Will depend on metallicity, intensity of UV radiation (e.g. local SFR), etc. ...
... The timescale for molecular cloud (MC) disruption, tesc, is not wellconstrained observationally Plausibly ranges from 106.5 < tesc < 107.5 yrs – Will depend on metallicity, intensity of UV radiation (e.g. local SFR), etc. ...
Interpretation of the Helix Planetary Nebula using Hydro
... expansion of a flat universe (Riess et al. 2004). Departures indicate a recent dimming at all frequencies by about 30%, but with large scatter attributed to uncertainty in the SNe Ia models. For ≥15 years of study the evidence has accumulated with no explanation other than an accelerating, rather th ...
... expansion of a flat universe (Riess et al. 2004). Departures indicate a recent dimming at all frequencies by about 30%, but with large scatter attributed to uncertainty in the SNe Ia models. For ≥15 years of study the evidence has accumulated with no explanation other than an accelerating, rather th ...
Astronomy Astrophysics
... that of WD 1845+019 (see Fig. 2 of Maxted & Marsh 1999). In this case the emission is due to a cool companion star in a long orbit around the white dwarf. This scenario could also be valid for WD 0518+333 and might explain why different methods of analysis give such disparate results. The low gravity ...
... that of WD 1845+019 (see Fig. 2 of Maxted & Marsh 1999). In this case the emission is due to a cool companion star in a long orbit around the white dwarf. This scenario could also be valid for WD 0518+333 and might explain why different methods of analysis give such disparate results. The low gravity ...
12 The Milky Way - Journigan-wiki
... nucleus. However using x-ray, infrared and radio frequencies, we can “see” that the core contains a vast number of stars and a giant black hole. ...
... nucleus. However using x-ray, infrared and radio frequencies, we can “see” that the core contains a vast number of stars and a giant black hole. ...
Rotational Doppler beaming in eclipsing binaries
... To illustrate the rotational beaming effect we used Kepler’s laws, the white dwarf mass-radius relation mentioned above, a massive star main-sequence mass-radius relation (at solar metallicity) from Pols et al. (1998), stars with no limb darkening (but, see Sect. 3.1) and Eqs. 1 & 2. The two stars a ...
... To illustrate the rotational beaming effect we used Kepler’s laws, the white dwarf mass-radius relation mentioned above, a massive star main-sequence mass-radius relation (at solar metallicity) from Pols et al. (1998), stars with no limb darkening (but, see Sect. 3.1) and Eqs. 1 & 2. The two stars a ...
The star Epsilon UMa, or more commonly known as Alioth
... Different stars have different apparent and absolute bolometric magnitudes. An apparent bolometric magnitude is a number scale invented by a Greek astronomer Hipparchus. This scale describes how bright a star appears in the night sky ranging from 1 for the brightest star to 6 for the dimmest star ab ...
... Different stars have different apparent and absolute bolometric magnitudes. An apparent bolometric magnitude is a number scale invented by a Greek astronomer Hipparchus. This scale describes how bright a star appears in the night sky ranging from 1 for the brightest star to 6 for the dimmest star ab ...
Stargazer - Everett Astronomical Society
... place, depending upon the weather, of course. Call Ron about spur-ofthe-moment observing. Please also join the EAS e-mail list, and then send mail to the mail list at [email protected] to coordinate spur-of-the-moment observing get-togethers, on nights when the sky clears. We try to hold ...
... place, depending upon the weather, of course. Call Ron about spur-ofthe-moment observing. Please also join the EAS e-mail list, and then send mail to the mail list at [email protected] to coordinate spur-of-the-moment observing get-togethers, on nights when the sky clears. We try to hold ...
Toward a revival of Stellar Intensity Interferometry
... include a processor that handles serial communication and data-transfer with a Universiy of Utah, see text for details. computer. This prototype is now fully working and tests in the laboratory with an artificial source and two photo-multipliers are under way. Another approach consists in working di ...
... include a processor that handles serial communication and data-transfer with a Universiy of Utah, see text for details. computer. This prototype is now fully working and tests in the laboratory with an artificial source and two photo-multipliers are under way. Another approach consists in working di ...