Polaris B, an optical companion of Polaris (alpha UMi) system
... Radial velocity measurements were carried out using Hβ and 63 absorption lines of metals. The results are: −16.6 km s−1 and −18.9±3.6 km s−1 , respectively. These data are close within the limits of errors to Kamper’s (1996) result of −14.7±1.2 km s−1 . To evaluate the line blends for Polaris B, the ...
... Radial velocity measurements were carried out using Hβ and 63 absorption lines of metals. The results are: −16.6 km s−1 and −18.9±3.6 km s−1 , respectively. These data are close within the limits of errors to Kamper’s (1996) result of −14.7±1.2 km s−1 . To evaluate the line blends for Polaris B, the ...
Stellar Evolution - Astrophysics
... Earth’s atmosphere if the stellar distance is known. Crucial to the determination of stellar distances is a knowledge of the scale of the Solar System. Relative distances of planets from the Sun may be deduced from Kepler’s Third Law. Take barycentric distances of various planets (a) relative to tha ...
... Earth’s atmosphere if the stellar distance is known. Crucial to the determination of stellar distances is a knowledge of the scale of the Solar System. Relative distances of planets from the Sun may be deduced from Kepler’s Third Law. Take barycentric distances of various planets (a) relative to tha ...
Astronomical seeing conditions as determined by turbulence modelling and optical measurement
... Modern space geodetic techniques are required to provide measurements of millimetrelevel accuracy. A new fundamental space geodetic observatory for South Africa has been proposed. It will house state-of-the-art equipment in a location that guarantees optimal scientific output. Lunar Laser Ranging (L ...
... Modern space geodetic techniques are required to provide measurements of millimetrelevel accuracy. A new fundamental space geodetic observatory for South Africa has been proposed. It will house state-of-the-art equipment in a location that guarantees optimal scientific output. Lunar Laser Ranging (L ...
Observing Titan with amateur equipment
... Although the proliferation of CCD cameras makes CCD photometry, where image processing software is used to measure the light from Titan and to subtract the scattered light background by summing pixels, rather widespread, the inherent simplicity and precision of photoelectric photometry (wherein a si ...
... Although the proliferation of CCD cameras makes CCD photometry, where image processing software is used to measure the light from Titan and to subtract the scattered light background by summing pixels, rather widespread, the inherent simplicity and precision of photoelectric photometry (wherein a si ...
elt science case
... New observational facilities in the coming decade will try to address these questions. Furthermore, new fundamental question may arise: the evidence for dark energy was found only recently, and it added a new component to the Universe, the biggest component in terms of energy density at low redshift ...
... New observational facilities in the coming decade will try to address these questions. Furthermore, new fundamental question may arise: the evidence for dark energy was found only recently, and it added a new component to the Universe, the biggest component in terms of energy density at low redshift ...
Variability of young solar-type stars: Spot cycles, rotation
... phenomena from a wider sample of stars. Observing the activity of solar-type stars with different activity levels is in particular useful since it can provide data from a wide range of activity behaviours from stars that can easily be compared with the Sun. The object of this thesis is to study the s ...
... phenomena from a wider sample of stars. Observing the activity of solar-type stars with different activity levels is in particular useful since it can provide data from a wide range of activity behaviours from stars that can easily be compared with the Sun. The object of this thesis is to study the s ...
Chapter 17 - Astronomy
... normally having fewer than 25% of the number of stars in the Milky Way. 3. Collisions between galaxies are not unusual because on average galaxies are separated by distances only about 20 times their diameter. On the other hand, stars in a galaxy rarely collide since they are separated by distances ...
... normally having fewer than 25% of the number of stars in the Milky Way. 3. Collisions between galaxies are not unusual because on average galaxies are separated by distances only about 20 times their diameter. On the other hand, stars in a galaxy rarely collide since they are separated by distances ...
Astronomy
... result in a cascade of particles which can be detected by current observatories.[38] Additionally, some future neutrino detectors may also be sensitive to the particles produced when cosmic rays hit the Earth's atmosphere.[33] Gravitational wave astronomy is an emerging new field of astronomy which ...
... result in a cascade of particles which can be detected by current observatories.[38] Additionally, some future neutrino detectors may also be sensitive to the particles produced when cosmic rays hit the Earth's atmosphere.[33] Gravitational wave astronomy is an emerging new field of astronomy which ...
Polaris B, an optical companion of the Polaris (αUMi) system
... that suggestion (Evans et al. 2007). It would therefore be interesting to establish the atmospheric parameters and chemical composition of component B for comparison with those for the Cepheid Polaris itself – it is known that Cepheid progenitors are main-sequence B stars, more massive and rapidly e ...
... that suggestion (Evans et al. 2007). It would therefore be interesting to establish the atmospheric parameters and chemical composition of component B for comparison with those for the Cepheid Polaris itself – it is known that Cepheid progenitors are main-sequence B stars, more massive and rapidly e ...
COMET 17/P Holmes - The O`Neal Web Site
... Andromeda and its attendant nebula. Discovered only two days previously by Mr. Edwin Holmes of London, it presented a great round disc with definite edges visible to the naked eye. This contained a tail in embryo, which subsequently opened into a feeble brush, the head being then pearshaped, and gra ...
... Andromeda and its attendant nebula. Discovered only two days previously by Mr. Edwin Holmes of London, it presented a great round disc with definite edges visible to the naked eye. This contained a tail in embryo, which subsequently opened into a feeble brush, the head being then pearshaped, and gra ...
SystemManual - NRAO Safe Server
... using is called GUPPI which stands for Green Bank Ultimate Pulsar Processing Instrument. This is a flexible signal processor that uses field programmable gate hardware and design tools for pulsar observation. Another digital backend that the NRAO is about put in place is called VEGAS which stands fo ...
... using is called GUPPI which stands for Green Bank Ultimate Pulsar Processing Instrument. This is a flexible signal processor that uses field programmable gate hardware and design tools for pulsar observation. Another digital backend that the NRAO is about put in place is called VEGAS which stands fo ...
Multiwavelength observations of XTE J1118+480`s outburst
... •but 100 x lower than X-rays!!! Material absorbing in X-rays must be concentrated near the compact object ...
... •but 100 x lower than X-rays!!! Material absorbing in X-rays must be concentrated near the compact object ...
Silicon isotopic abundance toward evolved stars and its application
... Vollmer et al. 2008), indicating that the amount of Si isotopes locked in the SiC grains and the SiO group in silicates may be similar; an example are the Orgueil silicate grains shown in Fig. 3. Most of the presolar grains have 29 Si/30 Si ratios around 1.5, but evidence of lower 29 Si/30 Si ratios ...
... Vollmer et al. 2008), indicating that the amount of Si isotopes locked in the SiC grains and the SiO group in silicates may be similar; an example are the Orgueil silicate grains shown in Fig. 3. Most of the presolar grains have 29 Si/30 Si ratios around 1.5, but evidence of lower 29 Si/30 Si ratios ...
Beyond Pluto: Exploring the outer limits of the solar - e
... Like the planets Pluto and Neptune, the existence of what is frequently called the Kuiper Belt was predicted theoretically long before it was actually observed. Probably the first fairly detailed speculation about a cometary ring beyond Neptune was put forward by Kenneth Essex Edgeworth in 1943. Edge ...
... Like the planets Pluto and Neptune, the existence of what is frequently called the Kuiper Belt was predicted theoretically long before it was actually observed. Probably the first fairly detailed speculation about a cometary ring beyond Neptune was put forward by Kenneth Essex Edgeworth in 1943. Edge ...
Sky Watcher - Boise Astronomical Society
... While observing Saturn, take notice of a star closer to the moon, but on its right side. This is the wide double star Zubenelgenubi. A pair of binoculars, if held steady, shows that it’s actually two stars. It’s possible that those with good eyesight can see Zubenelgenubi as two stars without optic ...
... While observing Saturn, take notice of a star closer to the moon, but on its right side. This is the wide double star Zubenelgenubi. A pair of binoculars, if held steady, shows that it’s actually two stars. It’s possible that those with good eyesight can see Zubenelgenubi as two stars without optic ...
the red supergiant content of m31
... effective temperatures that increases with higher luminosities, with one sequence consisting of early K-type supergiants, and with the other consisting of M-type supergiants that become later (cooler) with increasing luminosities. This separation is only partially reflected in the evolutionary tracks ...
... effective temperatures that increases with higher luminosities, with one sequence consisting of early K-type supergiants, and with the other consisting of M-type supergiants that become later (cooler) with increasing luminosities. This separation is only partially reflected in the evolutionary tracks ...
Nelson
... know what the angle dependent correction needs to be – With lasers, one must do tomography to get this information – One must have multiple deformable mirrors to make the added ...
... know what the angle dependent correction needs to be – With lasers, one must do tomography to get this information – One must have multiple deformable mirrors to make the added ...
A fundamental metallicity relation for galaxies at z = 0.84–1.47 from
... (NBJ and NBH ), along with the H2 S1 filter in the K band, to undertake panoramic, moderate depth surveys of emission line galaxies. HiZELS targets the Hα emission line redshifted into the nearinfrared at z = 0.84, 1.47 and 2.23 using these filters. In addition, the UKIRT data are complemented by de ...
... (NBJ and NBH ), along with the H2 S1 filter in the K band, to undertake panoramic, moderate depth surveys of emission line galaxies. HiZELS targets the Hα emission line redshifted into the nearinfrared at z = 0.84, 1.47 and 2.23 using these filters. In addition, the UKIRT data are complemented by de ...
IAA Annual Report 2014
... and IAA will participate in the construction of its instrumentation. PLATO, planned to launch in 2024, is to begin a completely new chapter in the exploration of extrasolar planets. During this year, IAA was active working on the instrumentation of several other ESA space missions (e.g. NOMAD onboar ...
... and IAA will participate in the construction of its instrumentation. PLATO, planned to launch in 2024, is to begin a completely new chapter in the exploration of extrasolar planets. During this year, IAA was active working on the instrumentation of several other ESA space missions (e.g. NOMAD onboar ...
The Kuiper Belt Explored by Serendipitous Stellar Occultations
... observations provide lightcurves in which the occultation signatures appear as very brief dips. Depending on the target stars, the occultation waveform may exhibit Fresnel diffraction effects. The star’s size and the geometry of the occultation must be carefully taken into account to interpret the o ...
... observations provide lightcurves in which the occultation signatures appear as very brief dips. Depending on the target stars, the occultation waveform may exhibit Fresnel diffraction effects. The star’s size and the geometry of the occultation must be carefully taken into account to interpret the o ...
FY96
... globular clusters in very different regimes of orbital period. Using the Argus multi-object spectrograph on the Blanco 4-m telescope, Cote and Philippe Fischer (Michigan U.) have searched for main-sequence binaries with very short periods, between 2 days and 3 years, in the cluster M4. In a sample o ...
... globular clusters in very different regimes of orbital period. Using the Argus multi-object spectrograph on the Blanco 4-m telescope, Cote and Philippe Fischer (Michigan U.) have searched for main-sequence binaries with very short periods, between 2 days and 3 years, in the cluster M4. In a sample o ...
Herschel Observers` Manual
... closed to ground-based astronomy - using a suite of three state-of-the-art instruments called PACS, SPIRE and HIFI. Herschel is an observatory mission: that is, its time is distributed among the community instead of being used for a large-scale survey. It is also a consumables-limited mission - its ...
... closed to ground-based astronomy - using a suite of three state-of-the-art instruments called PACS, SPIRE and HIFI. Herschel is an observatory mission: that is, its time is distributed among the community instead of being used for a large-scale survey. It is also a consumables-limited mission - its ...
The science case for - Astrophysics
... In the Extremely Large Telescope era we will study planets around stars other than our own Sun, study individual stars in galaxies far beyond our own Milky Way, and begin detailed study of galaxies at cosmological distances. The context of these studies, in an era when particle physics, fundamental ...
... In the Extremely Large Telescope era we will study planets around stars other than our own Sun, study individual stars in galaxies far beyond our own Milky Way, and begin detailed study of galaxies at cosmological distances. The context of these studies, in an era when particle physics, fundamental ...
Leibniz Institute for Astrophysics Potsdam
Leibniz Institute for Astrophysics Potsdam (AIP) is a German research institute. It is the successor of the Berlin Observatory founded in 1700 and of the Astrophysical Observatory Potsdam (AOP) founded in 1874. The latter was the world's first observatory to emphasize explicitly the research area of astrophysics. The AIP was founded in 1992, in a re-structuring following the German Reunification.The AIP is privately funded and member of the Leibniz Association. It is located in Babelsberg in the state of Brandenburg, just west of Berlin, though the Einstein Tower solar observatory and the great refractor telescope on Telegrafenberg in Potsdam belong to the AIP. The key topics of the AIP are cosmic magnetic fields (magnetohydrodynamics) on various scales and extragalactic astrophysics. Astronomical and astrophysical fields studied at the AIP range from solar and stellar physics to stellar and galactic evolution to cosmology. The institute also develops research technology in the fields of spectroscopy and robotic telescopes. It is a partner of the Large Binocular Telescope in Arizona, has erected robotic telescopes in Tenerife and the Antarctic, develops astronomical instrumentation for large telescopes such as the VLT of the ESO. Furthermore, work on several e-Science projects are carried out at the AIP.