19_Testbank - Lick Observatory
... B) the theory that the Milky Way is a spiral galaxy and looks like a whirlpool from above C) the theory that hot, ionized gas blows out of the galactic center like a jet or fountain D) the theory that hot, ionized gas blown out of the galactic disk and into the halo by superbubbles cools down and fa ...
... B) the theory that the Milky Way is a spiral galaxy and looks like a whirlpool from above C) the theory that hot, ionized gas blows out of the galactic center like a jet or fountain D) the theory that hot, ionized gas blown out of the galactic disk and into the halo by superbubbles cools down and fa ...
A cold detached dust envelope around an oxygen-rich Mira
... We have applied HIRAS to the IRAS 60 and 100 µm data in order to investigate the spatial structure around R Hya. The 60 and 100 µm images of R Hya are shown in Fig. 2a and b, respectively. The 60 µm image (Fig. 2a) shows a definite component of the extended emission around R Hya with an effective sp ...
... We have applied HIRAS to the IRAS 60 and 100 µm data in order to investigate the spatial structure around R Hya. The 60 and 100 µm images of R Hya are shown in Fig. 2a and b, respectively. The 60 µm image (Fig. 2a) shows a definite component of the extended emission around R Hya with an effective sp ...
Grzegorz Nowak, Andrzej Niedzielski, Aleksander Wolszczan, Pawe
... Red giants represent later phase of evolution of the main sequence stars. The planet induced Doppler shifts are easy to detect in radial velocity measurements of these stars, because they have lower effective temperatures and lower rotational velocities compared to their main sequence progenitors. T ...
... Red giants represent later phase of evolution of the main sequence stars. The planet induced Doppler shifts are easy to detect in radial velocity measurements of these stars, because they have lower effective temperatures and lower rotational velocities compared to their main sequence progenitors. T ...
... of a quadratic pulsation ephemerides (a secularly decreasing period) and an orbital timing model which fits the O-C data within the photometry uncertainties (Saha & White 1990; Kiss et al. 1995; Wade et al. 1999). Wade et al. (1999) also show convincing evidence that the centre-of-mass velocities fo ...
HRC Update Ralph Kraft and Junfeng Wang
... Another year has passed and the HRC continues to operate normally. There have been no significant changes or performance anomalies since the last Chandra newsletter. However, as described in detail in Jeremy Drake’s article on LETG, the CXC calibration team felt that the gain loss, and therefore qua ...
... Another year has passed and the HRC continues to operate normally. There have been no significant changes or performance anomalies since the last Chandra newsletter. However, as described in detail in Jeremy Drake’s article on LETG, the CXC calibration team felt that the gain loss, and therefore qua ...
Nebulae.The Lagoon and Dumbbell Nebulae
... interstellar matter with different density. On some places, clouds of dust, hydrogen and plasma are being formed. They can be seen under certain circumstances. These objects are called nebulae. Nebulae are interstellar clouds of dust, gas and plasma. They could be seen due to the emitted and absorbe ...
... interstellar matter with different density. On some places, clouds of dust, hydrogen and plasma are being formed. They can be seen under certain circumstances. These objects are called nebulae. Nebulae are interstellar clouds of dust, gas and plasma. They could be seen due to the emitted and absorbe ...
Chemical Composition and Evolutionary Status of the Ap Star HD
... presence. The filled circles mark the points of the observed spectrum, the dashed curve indicates the calculations without a magnetic field, the solid curve indicates the calculations for a field of 0.7 kG, and the dotted curve indicates the calculations for a field of 1 kG. It can be concluded from the ...
... presence. The filled circles mark the points of the observed spectrum, the dashed curve indicates the calculations without a magnetic field, the solid curve indicates the calculations for a field of 0.7 kG, and the dotted curve indicates the calculations for a field of 1 kG. It can be concluded from the ...
Isotopic composition of Hg and Pt in 5 slowly rotating HgMn stars *
... peculiarities in the spectra of HgMn stars have not been suciently constrained so far by the available abundance data. Previous studies of Hg and Pt in samples of HgMn stars often relied on spectra of rather low resolution and low S/N ratio, so that only limited information could be derived from th ...
... peculiarities in the spectra of HgMn stars have not been suciently constrained so far by the available abundance data. Previous studies of Hg and Pt in samples of HgMn stars often relied on spectra of rather low resolution and low S/N ratio, so that only limited information could be derived from th ...
A Compilation of Relevant Articles from MMM`s first 25 years, issues
... 1.A. Proxima Centauri, a small red M-type star, is just a little closer than the Alpha Centauri double sun of which it is a distant companion. This system lies 60° below the celestial equator, well below the horizon from most of the USA. 2.A. 106 million times as far as the Moon, and 9,000 times as ...
... 1.A. Proxima Centauri, a small red M-type star, is just a little closer than the Alpha Centauri double sun of which it is a distant companion. This system lies 60° below the celestial equator, well below the horizon from most of the USA. 2.A. 106 million times as far as the Moon, and 9,000 times as ...
File
... • are recent discovery (by Edwin Hubble in late 1920’s) • can be classified by morphology (shapes and sizes) Three Main Types of Galaxies: • Ellipticals - galaxies are pure bulge, no disk component ...
... • are recent discovery (by Edwin Hubble in late 1920’s) • can be classified by morphology (shapes and sizes) Three Main Types of Galaxies: • Ellipticals - galaxies are pure bulge, no disk component ...
Report of the HST-JWST Transition Panel
... Except for the gyroscopes, only the thermal insulation and one of the Fine Guidance Sensors are presently degraded. SM4 is scheduled to repair the thermal insulation and replace the faulty Fine Guidance Sensor. Informed engineering estimates show that the HST must be revitalized by the Shuttle ever ...
... Except for the gyroscopes, only the thermal insulation and one of the Fine Guidance Sensors are presently degraded. SM4 is scheduled to repair the thermal insulation and replace the faulty Fine Guidance Sensor. Informed engineering estimates show that the HST must be revitalized by the Shuttle ever ...
GMRT search for 150 MHz radio emission from the transiting
... to 104 times stronger emitters than Jupiter. However, the extreme physical conditions of “hot-Jupiters” could make this realizable, e.g., through a massive infall of Poynting flux on them (Zarka 2007). This provides the physical justification for the radio-magnetic scaling law proposed by Zarka et a ...
... to 104 times stronger emitters than Jupiter. However, the extreme physical conditions of “hot-Jupiters” could make this realizable, e.g., through a massive infall of Poynting flux on them (Zarka 2007). This provides the physical justification for the radio-magnetic scaling law proposed by Zarka et a ...
Astrophysics Lab “A”
... wavelength range covers 1150 . . . 1850 Å. A first series of spectra consists of observations performed with the IUE (International Ultraviolet Explorer) satellite, one of the most important (earlier) instruments for the wind diagnostics of hot stars, and displays Galactic objects. A second series ...
... wavelength range covers 1150 . . . 1850 Å. A first series of spectra consists of observations performed with the IUE (International Ultraviolet Explorer) satellite, one of the most important (earlier) instruments for the wind diagnostics of hot stars, and displays Galactic objects. A second series ...
Constraints on the exosphere of CoRoT-7b*
... plasma torus of Io, we select these lines for our study. Figure 1 shows the coadded spectrum of CoRoT-7b of data-set I. The wavelength is in the rest frame of the star. The full line is the spectrum taken in-transit, and the dashed line is the spectrum taken out-of-transit. The S/N of the coadded sp ...
... plasma torus of Io, we select these lines for our study. Figure 1 shows the coadded spectrum of CoRoT-7b of data-set I. The wavelength is in the rest frame of the star. The full line is the spectrum taken in-transit, and the dashed line is the spectrum taken out-of-transit. The S/N of the coadded sp ...
CO OBSERVATIONS OF SPIRAL STRUCTURE AND THE LIFETIME
... event would therefore need to supply a momentum of k x 1 0 MQ k m - s or it must ionize k x 1 0 MQ at an average density of 1 0 H nuclei! per cc. Since these requirements far exceed the capabilities of supernova or common 0-stars, the process of removing Hp from clouds is more likely in the form of ...
... event would therefore need to supply a momentum of k x 1 0 MQ k m - s or it must ionize k x 1 0 MQ at an average density of 1 0 H nuclei! per cc. Since these requirements far exceed the capabilities of supernova or common 0-stars, the process of removing Hp from clouds is more likely in the form of ...
Chapter 18 - Origin and Evolution of Stars Chapter Preview
... combining a red nitrogen emission line image with a green hydrogen emission line image and a blue oxygen emission line image. The gas in the Orion Nebula is set aglow by a young massive star outside of this image toward the bottom left. Visible on this image, and its inset, are teardrop shaped cocoo ...
... combining a red nitrogen emission line image with a green hydrogen emission line image and a blue oxygen emission line image. The gas in the Orion Nebula is set aglow by a young massive star outside of this image toward the bottom left. Visible on this image, and its inset, are teardrop shaped cocoo ...
IRMOS: The near-InfraRed Multi-Object
... The NGS subsystem serves four important purposes: 1) The six probe arms are used for acquisition of the scientific FOV; 2) The multiple arms can be used to measure and control, via feedback to the telescope control system, the telescope-delivered plate scale; 3) Focus measured from the NGS WFS can b ...
... The NGS subsystem serves four important purposes: 1) The six probe arms are used for acquisition of the scientific FOV; 2) The multiple arms can be used to measure and control, via feedback to the telescope control system, the telescope-delivered plate scale; 3) Focus measured from the NGS WFS can b ...
Chapter 19 Stars Galaxies and the Universe
... gas and dust called a protostar. Gravity pulls the gas and dust together. As the ball becomes denser, it gets hotter. Eventually, the gas becomes so hot that it begins to react. These reactions produce energy, which keeps the new star from collapsing more. The second, and longest, stage of a star’s ...
... gas and dust called a protostar. Gravity pulls the gas and dust together. As the ball becomes denser, it gets hotter. Eventually, the gas becomes so hot that it begins to react. These reactions produce energy, which keeps the new star from collapsing more. The second, and longest, stage of a star’s ...
Ptolemy: on trial for fraud
... betraying the ethics and integrity of his profesconcluded that more stars must have been greatest astronomer of antiquity, or the greatsion. The Almagest had “done more damage to added after Hipparchus, presumably by Ptolest fraud in the history of science? astronomy than any other work ever written ...
... betraying the ethics and integrity of his profesconcluded that more stars must have been greatest astronomer of antiquity, or the greatsion. The Almagest had “done more damage to added after Hipparchus, presumably by Ptolest fraud in the history of science? astronomy than any other work ever written ...
Astrophysical parameters of ten poorly studied open star clusters
... with the 2MASS J, H and Ks filters (Bonatto et al. 2004; Bica et al. 2006) to derive the cluster parameters. The simultaneous fittings were attempted on the J ∼ (J − H) and Ks ∼ (J − Ks ) diagrams for the inner stars, which should be less contaminated by the background field. If the number of stars ...
... with the 2MASS J, H and Ks filters (Bonatto et al. 2004; Bica et al. 2006) to derive the cluster parameters. The simultaneous fittings were attempted on the J ∼ (J − H) and Ks ∼ (J − Ks ) diagrams for the inner stars, which should be less contaminated by the background field. If the number of stars ...
HR DIAGRAMS OF STAR CLUSTERS
... don’t know whether it was born last week or a billion years ago. So star clusters are exquisite indicators of stellar evolution, and are prime objects of study by astronomers investigating the life histories of stars. Figure 4: HOW THE HR DIAGRAM OF A CLUSTER CHANGES AS IT AGES ...
... don’t know whether it was born last week or a billion years ago. So star clusters are exquisite indicators of stellar evolution, and are prime objects of study by astronomers investigating the life histories of stars. Figure 4: HOW THE HR DIAGRAM OF A CLUSTER CHANGES AS IT AGES ...
Estudio de Cúmulos de Galaxias en el Sloan Digital Sky Survey
... Sub-mm flux (850µm). of LBGs, how many are predicted to be SMGs? ...
... Sub-mm flux (850µm). of LBGs, how many are predicted to be SMGs? ...
International Ultraviolet Explorer
The International Ultraviolet Explorer (IUE) was an astronomical observatory satellite primarily designed to take ultraviolet spectra. The satellite was a collaborative project between NASA, the UK Science Research Council and the European Space Agency (ESA). The mission was first proposed in early 1964, by a group of scientists in the United Kingdom, and was launched on January 26, 1978 aboard a NASA Delta rocket. The mission lifetime was initially set for 3 years, but in the end it lasted almost 18 years, with the satellite being shut down in 1996. The switch-off occurred for financial reasons, while the telescope was still functioning at near original efficiency.It was the first space observatory to be operated in real time by astronomers who visited the groundstations in the United States and Europe. Astronomers made over 104,000 observations using the IUE, of objects ranging from solar system bodies to distant quasars. Among the significant scientific results from IUE data were the first large scale studies of stellar winds, accurate measurements of the way interstellar dust absorbs light, and measurements of the supernova SN1987A which showed that it defied stellar evolution theories as they then stood. When the mission ended, it was considered the most successful astronomical satellite ever.