Infrared Astronomy
... Humans at normal body temperature, radiate most strongly in the infrared, which is definitely not seen by human eyes. The scientific discovery that the heat we all feel coming from the Sun is largely a radiation beyond the visible red colour of the solar spectrum was made by William Herschel in 1800 ...
... Humans at normal body temperature, radiate most strongly in the infrared, which is definitely not seen by human eyes. The scientific discovery that the heat we all feel coming from the Sun is largely a radiation beyond the visible red colour of the solar spectrum was made by William Herschel in 1800 ...
Altair -- the ``hottest`` magnetically active star in X-rays
... with the mean deviation, for each period. As shown in the upper panel of Fig. 2, a minimum, particularly pronounced for the first observation, is obtained for periods around 10 ± 1 h. This indicates, that rotational modulation is indeed present and points to a distribution of active regions that per ...
... with the mean deviation, for each period. As shown in the upper panel of Fig. 2, a minimum, particularly pronounced for the first observation, is obtained for periods around 10 ± 1 h. This indicates, that rotational modulation is indeed present and points to a distribution of active regions that per ...
Observational evidence for AGN feedback in early
... problem is that this process is poorly understood, and compelling observational evidence for its mere existence is still missing. In search for signatures of AGN feedback, we have compiled a sample of 16 000 early-type galaxies in the redshift range 0.05 < z < 0.1 from the Sloan Digital Sky Survey ( ...
... problem is that this process is poorly understood, and compelling observational evidence for its mere existence is still missing. In search for signatures of AGN feedback, we have compiled a sample of 16 000 early-type galaxies in the redshift range 0.05 < z < 0.1 from the Sloan Digital Sky Survey ( ...
The physics and modes of star cluster formation: observations
... understanding of the physical process of cluster formation is far from being realized. The first step towards achieving this goal is to construct a solid empirical foundation upon which a physical theory can eventually be built. This then requires a detailed understanding of the physical nature of em ...
... understanding of the physical process of cluster formation is far from being realized. The first step towards achieving this goal is to construct a solid empirical foundation upon which a physical theory can eventually be built. This then requires a detailed understanding of the physical nature of em ...
Structure in the first quadrant of the Galaxy: an analysis of TMGS star
... element may contain up to 87 source categories, derived from detailed analyses of the content of the IRAS sky (Walker et al. 1989). These comprise 33 ‘normal’ stellar types; 42 types of AGB star, both oxygen- and carbon-rich; six types of object that are distinct from others only in their MIR high l ...
... element may contain up to 87 source categories, derived from detailed analyses of the content of the IRAS sky (Walker et al. 1989). These comprise 33 ‘normal’ stellar types; 42 types of AGB star, both oxygen- and carbon-rich; six types of object that are distinct from others only in their MIR high l ...
A Variability Study of the Typical Red Supergiant Antares A
... the exception of the bright M-class supergiant Betelgeuse (α Orionis, M2 Iab). Betelgeuse has been well studied both observationally and theoretically, and has many features that are well described by models of convection. It was these studies of Betelgeuse that provided the main motivation for this ...
... the exception of the bright M-class supergiant Betelgeuse (α Orionis, M2 Iab). Betelgeuse has been well studied both observationally and theoretically, and has many features that are well described by models of convection. It was these studies of Betelgeuse that provided the main motivation for this ...
The evolution of low-metallicity massive stars - Argelander
... appropriate for the low-metallicity dwarf galaxy I Zwicky 18 are presented and analyzed. We find that the fast rotating models (& 300 km/s) become a particular type of objects predicted only at low-metallicity: the so-called Transparent Wind Ultraviolet INtense (TWUIN) stars. TWUIN stars are fast ro ...
... appropriate for the low-metallicity dwarf galaxy I Zwicky 18 are presented and analyzed. We find that the fast rotating models (& 300 km/s) become a particular type of objects predicted only at low-metallicity: the so-called Transparent Wind Ultraviolet INtense (TWUIN) stars. TWUIN stars are fast ro ...
Observational Studies of Interacting Galaxies and the Development
... expected value. Spectroscopically, the kinematic properties of close pair galaxies were studied to understand how star formation were quenched at z ∼ 0.5. I discovered that the number of red-red pairs are rare, which does not support the gravitational quenching mechanism suggested by the hot halo mo ...
... expected value. Spectroscopically, the kinematic properties of close pair galaxies were studied to understand how star formation were quenched at z ∼ 0.5. I discovered that the number of red-red pairs are rare, which does not support the gravitational quenching mechanism suggested by the hot halo mo ...
Differential rotation in Sun-like stars from surface variability and
... and latitude. The presence of a shear at the base of the solar convection zone is thought to play a key role in the generation of magnetic fields. So far however, the internal rotation profiles of stars other than the Sun are unknown, and placing constraints on models of rotation and magnetic dynamo ...
... and latitude. The presence of a shear at the base of the solar convection zone is thought to play a key role in the generation of magnetic fields. So far however, the internal rotation profiles of stars other than the Sun are unknown, and placing constraints on models of rotation and magnetic dynamo ...
Strongly suggested reading: The stellar halo of the Galaxy
... Soneira (1980) model of the Galaxy. These authors took the approach that our Galaxy is “just” like any other galaxy, and so it should be possible to reproduce the star counts using models that fit the light distribution of external galaxies. For example, they proposed the halo followed a “de Vaucoul ...
... Soneira (1980) model of the Galaxy. These authors took the approach that our Galaxy is “just” like any other galaxy, and so it should be possible to reproduce the star counts using models that fit the light distribution of external galaxies. For example, they proposed the halo followed a “de Vaucoul ...
Gaia 1 and 2. A pair of new satellites of the Galaxy
... 10. Note however, that initially, this candidate, dubbed here Gaia 1, was rejected as it is located in close proximity of the brightest star on the sky – Sirius2 . Figure 3 shows the distribution of sources in the area around the candidate from three different surveys: Gaia, 2MASS and WISE (Wright e ...
... 10. Note however, that initially, this candidate, dubbed here Gaia 1, was rejected as it is located in close proximity of the brightest star on the sky – Sirius2 . Figure 3 shows the distribution of sources in the area around the candidate from three different surveys: Gaia, 2MASS and WISE (Wright e ...
Tuomas Kangas
... with the highest reported apparent brightness; SN 1054 which produced the famous Crab Nebula; SN 1572 which, observed by Tycho Brahe, helped dispel the old world cosmological models with their notion of unchanging heavens; and SN 1604, the last SN visually detected in our own galaxy1 . The first ext ...
... with the highest reported apparent brightness; SN 1054 which produced the famous Crab Nebula; SN 1572 which, observed by Tycho Brahe, helped dispel the old world cosmological models with their notion of unchanging heavens; and SN 1604, the last SN visually detected in our own galaxy1 . The first ext ...
A study of the evolution of radio pulsars through - UvA-DARE
... Sect. 4 the calculations in which pulsars are assumed to be born throughout the Galaxy, even though their observation is limited to the solar surroundings. Our conclusions are discussed in Sect. 5. 2. The population synthesis technique In this paper we use the same pulsar population synthesis techni ...
... Sect. 4 the calculations in which pulsars are assumed to be born throughout the Galaxy, even though their observation is limited to the solar surroundings. Our conclusions are discussed in Sect. 5. 2. The population synthesis technique In this paper we use the same pulsar population synthesis techni ...
- ISP 205, sec 1 - Visions of the
... 15. A The rings are not made of sticky material B There is not enough material C The rings are inside the Roche limit D The rings are too thin Answer for Part: 0 false false true false 1 pt Which of the following best explains what we think happened to outgassed water on Venus? 16. A It turned into ...
... 15. A The rings are not made of sticky material B There is not enough material C The rings are inside the Roche limit D The rings are too thin Answer for Part: 0 false false true false 1 pt Which of the following best explains what we think happened to outgassed water on Venus? 16. A It turned into ...
Evolution in circumstellar envelopes of Be stars: From disks to rings?
... Precursor: within a few days, broad emission wings appear at the bottom of the H i line profiles, and the peak height of the emission lines drop slightly. Quasiperiodic variations in the ratio of the strength of the blue and the red emission peak (V /R variability) set in. The separation of the peak ...
... Precursor: within a few days, broad emission wings appear at the bottom of the H i line profiles, and the peak height of the emission lines drop slightly. Quasiperiodic variations in the ratio of the strength of the blue and the red emission peak (V /R variability) set in. The separation of the peak ...
File practice exam
... c. 3 billion b. many billions d. a million ____ 90. Scientists determine the composition and temperature of stars a. by sampling matter on the surface of stars. b. by analyzing the vibrations that stars emit. c. through magnetic testing. d. by analyzing the spectra of the light that stars emit. ____ ...
... c. 3 billion b. many billions d. a million ____ 90. Scientists determine the composition and temperature of stars a. by sampling matter on the surface of stars. b. by analyzing the vibrations that stars emit. c. through magnetic testing. d. by analyzing the spectra of the light that stars emit. ____ ...
EVIDENCE OF MINOAN ASTRONOMY AND CALENDRICAL
... 2.2 Origin of the Hellenic lunar calendar Unfortunately, no written sources on the calendars of the Minoans have been preserved. The written records left by the Minoans are, with the exception of some short religious formulas, solely concerned with the palaces’ bookkeeping tasks. As it is known that ...
... 2.2 Origin of the Hellenic lunar calendar Unfortunately, no written sources on the calendars of the Minoans have been preserved. The written records left by the Minoans are, with the exception of some short religious formulas, solely concerned with the palaces’ bookkeeping tasks. As it is known that ...
VenusObsFRR
... » The past thermal analysis performed for the Venus observation only addressed the heating of the OTA baffles and light shield. There has been no formal analysis on the heating of the equipment shelf due to high sun angles. Christine Cottingham reports that it will not be a problem as long as the ap ...
... » The past thermal analysis performed for the Venus observation only addressed the heating of the OTA baffles and light shield. There has been no formal analysis on the heating of the equipment shelf due to high sun angles. Christine Cottingham reports that it will not be a problem as long as the ap ...
Understanding Variable Stars - Central Florida Astronomical Society
... Variable stars are those that change brightness. Their variability may be due to geometric processes such as rotation, or eclipse by a companion star, or physical processes such as vibration, flares, or cataclysmic explosions. In each case, variable stars provide unique information about the properti ...
... Variable stars are those that change brightness. Their variability may be due to geometric processes such as rotation, or eclipse by a companion star, or physical processes such as vibration, flares, or cataclysmic explosions. In each case, variable stars provide unique information about the properti ...
Studies of molecular clouds at the Galactic centre Roland Karlsson DECLINATION (B1950)
... build-up of the energy budget and the evolution of the various phenomena that are observed at different galactocentric radii. In barred spiral galaxies like the Galaxy, large scale transversal bars are suggested to pump material inwards such that the centre region is supplied with gas, dust and star ...
... build-up of the energy budget and the evolution of the various phenomena that are observed at different galactocentric radii. In barred spiral galaxies like the Galaxy, large scale transversal bars are suggested to pump material inwards such that the centre region is supplied with gas, dust and star ...
Abstract The Star Formation History of Low Surface Brightness Galaxies
... poorly constrained. These objects tend to be rather blue, contradicting the initial impression that they may simply be faded remnants of higher surface brightness galaxies whose star formation has finished. Other scenarios span a broad range: a young mean age, less dust, a lower metallicity, perhaps ...
... poorly constrained. These objects tend to be rather blue, contradicting the initial impression that they may simply be faded remnants of higher surface brightness galaxies whose star formation has finished. Other scenarios span a broad range: a young mean age, less dust, a lower metallicity, perhaps ...