The white dwarf population within 40 pc of the Sun
... atmospheric composition, and accurate measurements of their surface gravities and effective temperatures – are also needed. Over the last years, several model atmosphere grids with increasing levels of detail and sophistication have been released (Bergeron et al. 1992; Koester et al. 2001; Kowalski ...
... atmospheric composition, and accurate measurements of their surface gravities and effective temperatures – are also needed. Over the last years, several model atmosphere grids with increasing levels of detail and sophistication have been released (Bergeron et al. 1992; Koester et al. 2001; Kowalski ...
Colour-magnitude diagrams of the post
... presence of a blue HB is made more clear in Fig. 3c where essentially no blue MS contamination is seen, and stars in the locus of the blue HB are still seen. A quantitative check of the presence of an HB was carried out by counting stars in frames with different apertures around the cluster center. ...
... presence of a blue HB is made more clear in Fig. 3c where essentially no blue MS contamination is seen, and stars in the locus of the blue HB are still seen. A quantitative check of the presence of an HB was carried out by counting stars in frames with different apertures around the cluster center. ...
- StealthSkater
... These stars quite likely have planets. Indeed, one 'M' star (known as Barnard's star) is believed to almost certainly have at least one (and 2-or-3) Jupiter-sized planets. Peter Van de Kamp of the Sproul Observatory at Swarthmore College (PA) has watched Barnard's star for over 3 decades and is conv ...
... These stars quite likely have planets. Indeed, one 'M' star (known as Barnard's star) is believed to almost certainly have at least one (and 2-or-3) Jupiter-sized planets. Peter Van de Kamp of the Sproul Observatory at Swarthmore College (PA) has watched Barnard's star for over 3 decades and is conv ...
A Search for Extrasolar Planets Using Echoes Produced in Flare
... noticeable amount of energy that disturbs the steady state of the star on the whole or a part of it.’” The first noted occurrence of a flare from a star other than the Sun was in 1924 by Hertzsprung. At the time of the observation, Ejnar Hertzsprung attributed the brightening of the star to an in fa ...
... noticeable amount of energy that disturbs the steady state of the star on the whole or a part of it.’” The first noted occurrence of a flare from a star other than the Sun was in 1924 by Hertzsprung. At the time of the observation, Ejnar Hertzsprung attributed the brightening of the star to an in fa ...
The Milky Way as a galaxy
... (color-magnitude diagrams for some star clusters are displayed in Fig. 2.5); since they are all located at the same distance, their main sequence is already defined in a colormagnitude diagram in which only apparent magnitudes are plotted. This cluster main sequence can then be fitted to a calibrate ...
... (color-magnitude diagrams for some star clusters are displayed in Fig. 2.5); since they are all located at the same distance, their main sequence is already defined in a colormagnitude diagram in which only apparent magnitudes are plotted. This cluster main sequence can then be fitted to a calibrate ...
Star formation rates and efficiencies in the Galactic Centre
... To separate the two temperature components, we consider wavelengths between 5.8 - 24 µm for the warm component, and 160 - 500 µm for the cool component (cool component is provided by Battersby et al. in prep). We do not consider Spitzer data with wavelengths smaller than 5.8 µm when fitting the spec ...
... To separate the two temperature components, we consider wavelengths between 5.8 - 24 µm for the warm component, and 160 - 500 µm for the cool component (cool component is provided by Battersby et al. in prep). We do not consider Spitzer data with wavelengths smaller than 5.8 µm when fitting the spec ...
Wandering in the Redshift Desert
... like 4 FORS units, hence doing all the COSMOS pBzKs (and along with them a much larger number of star-forming galaxies in the desert) would take about a quarter of the time we have estimated above for FORS2, i.e., some 350 VLT nights. This still looks like a lot of time, yet is somewhat more afforda ...
... like 4 FORS units, hence doing all the COSMOS pBzKs (and along with them a much larger number of star-forming galaxies in the desert) would take about a quarter of the time we have estimated above for FORS2, i.e., some 350 VLT nights. This still looks like a lot of time, yet is somewhat more afforda ...
celestial navigation heaven`s guide for mere
... The last group of stars which can be observed in the sky is known as variable stars; stars that vary in luminosity. There are two types of variable stars namely the Cepheid variables and the Mira variables. The Cepheid variables are stars that regularly pulsate in size and change in brightness. As t ...
... The last group of stars which can be observed in the sky is known as variable stars; stars that vary in luminosity. There are two types of variable stars namely the Cepheid variables and the Mira variables. The Cepheid variables are stars that regularly pulsate in size and change in brightness. As t ...
THE HELIACAL RISE OF SIRIUS- Algorithm
... The atmospheric extinction for a given place shows how many star-magnitudes are extinguished by one earth atmosphere. In the best case, in a dry mountain desert, the extinction will be around 0.10. In the worse case, around some sea coasts, it may reach 0.40 and even 0.50. There are some scholars wh ...
... The atmospheric extinction for a given place shows how many star-magnitudes are extinguished by one earth atmosphere. In the best case, in a dry mountain desert, the extinction will be around 0.10. In the worse case, around some sea coasts, it may reach 0.40 and even 0.50. There are some scholars wh ...
ABSTRACT Exoplanet Habitability and an Analysis of Gliese 436 b
... molecular formation necessary for life, such as proteins and DNA, can be easily broken down.10 Greenhouse gases also allow for stability if they are in equilibrium with volcanic activity on the exoplanet.12 This is an effect of the carbon-silicate cycle which regulates the amount of carbon dioxide p ...
... molecular formation necessary for life, such as proteins and DNA, can be easily broken down.10 Greenhouse gases also allow for stability if they are in equilibrium with volcanic activity on the exoplanet.12 This is an effect of the carbon-silicate cycle which regulates the amount of carbon dioxide p ...
The white dwarf population within 40 pc of the Sun
... the number of simulated Monte Carlo realizations to 104 using bootstrap techniques – see Camacho et al. (2014) for details. In this way convergence in all the final values of the relevant quantities, can be ensured. In the next sections we present the ensemble average of the different Monte Carlo re ...
... the number of simulated Monte Carlo realizations to 104 using bootstrap techniques – see Camacho et al. (2014) for details. In this way convergence in all the final values of the relevant quantities, can be ensured. In the next sections we present the ensemble average of the different Monte Carlo re ...
The white dwarf population within 40 pc of the Sun
... dwarfs with the observed data is the implementation of the observational selection criteria in the theoretical samples. To account for the observational biases with a high degree of fidelity, we implemented the selection criteria employed by Limoges et al. (2013, 2015) in their analysis of the SUPER ...
... dwarfs with the observed data is the implementation of the observational selection criteria in the theoretical samples. To account for the observational biases with a high degree of fidelity, we implemented the selection criteria employed by Limoges et al. (2013, 2015) in their analysis of the SUPER ...
- National Optical Astronomy Observatory
... translation stage and the number of spectral frame to collect. (Take into account that one slit width is about half an arcsecond and the diffraction limit of the telescope at 5 microns is ~0.8 arcseconds. Spatially sampling at ~0.4 arcseconds would then be about right under good seeing.) ! Input sca ...
... translation stage and the number of spectral frame to collect. (Take into account that one slit width is about half an arcsecond and the diffraction limit of the telescope at 5 microns is ~0.8 arcseconds. Spatially sampling at ~0.4 arcseconds would then be about right under good seeing.) ! Input sca ...
diy astronomy - American Museum of Natural History
... At the end of this course, students will have learned or understand that: • The human eye is an imperfect, limited, and unreliable detector of light. • Astronomers use large telescopes primarily as a means to collect more photons. Large telescopes make better pictures. • There are limitations to ...
... At the end of this course, students will have learned or understand that: • The human eye is an imperfect, limited, and unreliable detector of light. • Astronomers use large telescopes primarily as a means to collect more photons. Large telescopes make better pictures. • There are limitations to ...
Chemical analysis of 24 dusty (pre-) main
... as a class in 1960 by Herbig, based on three observational criteria: the stars have spectral type A or earlier, display emission lines, and illuminate a bright reflection nebula in their immediate vicinity. Later on other observational criteria were proposed. Finkenzeller & Mundt (1984) mentioned th ...
... as a class in 1960 by Herbig, based on three observational criteria: the stars have spectral type A or earlier, display emission lines, and illuminate a bright reflection nebula in their immediate vicinity. Later on other observational criteria were proposed. Finkenzeller & Mundt (1984) mentioned th ...
Astronomy Astrophysics Detailed abundances of a large sample of giant stars in... and in the Sagittarius nucleus
... Homogeneous abundances of light elements, α-elements, and Fe-group elements from high-resolution FLAMES spectra are presented for 76 red giant stars in NGC 6715 (M 54), a massive globular cluster (GC) lying in the nucleus of the Sagittarius dwarf galaxy. We also derived detailed abundances for 27 re ...
... Homogeneous abundances of light elements, α-elements, and Fe-group elements from high-resolution FLAMES spectra are presented for 76 red giant stars in NGC 6715 (M 54), a massive globular cluster (GC) lying in the nucleus of the Sagittarius dwarf galaxy. We also derived detailed abundances for 27 re ...
Stellar evolution - Statistical Physics Group
... of time before these calculations are carried to a later stage of nuclear evolution. There are of course still some uncertainties in the basic physics of stellar interiors and these will be mentioned later. As soon as it was realized that nuclear reactions in an unmixed star could lead to the format ...
... of time before these calculations are carried to a later stage of nuclear evolution. There are of course still some uncertainties in the basic physics of stellar interiors and these will be mentioned later. As soon as it was realized that nuclear reactions in an unmixed star could lead to the format ...
Educator`s Guide
... The constellation, Canis Minor; another dog that is not so lucky: - The little dog is indeed ‘little’, only two stars. - The brighter one of these is Procyon. - It can be found by following an imaginary line through Orion’s shoulders and approximately straight up from Sirius. ...
... The constellation, Canis Minor; another dog that is not so lucky: - The little dog is indeed ‘little’, only two stars. - The brighter one of these is Procyon. - It can be found by following an imaginary line through Orion’s shoulders and approximately straight up from Sirius. ...
SkyWatcher2017.5 1.3 Mb - Boise Astronomical Society
... luminosity distance of DL = 749 mega-parsecs may be calculated from z. It is also one of the most luminous quasars known, with an absolute magnitude of −26.7, meaning that if it were only as distant as Pollux it would appear nearly as bright in the sky as the Sun. Since the sun's absolute magnitude ...
... luminosity distance of DL = 749 mega-parsecs may be calculated from z. It is also one of the most luminous quasars known, with an absolute magnitude of −26.7, meaning that if it were only as distant as Pollux it would appear nearly as bright in the sky as the Sun. Since the sun's absolute magnitude ...
FIRST STELLAR ABUNDANCES IN THE DWARF IRREGULAR
... evolution of more distant galaxies to date (Matteucci & Tosi 1985). So far, only a very limited number of elements can be examined and quantified when using this approach. The chemical evolution of a galaxy depends on the contributions of all its constituents, e.g., SNe type Ia and II, high mass sta ...
... evolution of more distant galaxies to date (Matteucci & Tosi 1985). So far, only a very limited number of elements can be examined and quantified when using this approach. The chemical evolution of a galaxy depends on the contributions of all its constituents, e.g., SNe type Ia and II, high mass sta ...
Legends Night Sky Orion
... she sent another man to steal it. This man bungled the job, and wound up killing Aqhat and dropping the bow into the sea. This is said to explain the astronomical fact that Orion and the Bow (an older version of the constellation) drops below the horizon for two months every spring. ...
... she sent another man to steal it. This man bungled the job, and wound up killing Aqhat and dropping the bow into the sea. This is said to explain the astronomical fact that Orion and the Bow (an older version of the constellation) drops below the horizon for two months every spring. ...
Abstract book
... age clusters (1 to 3 Gyrs) represent one of the most challenging test for the theory of AGB evolution and nucleosynthesis. Their masses (1.3 to 2.5 M_\odot) coincides with those of the stars responsible for the Galactic production of the s process main and strong components, which include about an h ...
... age clusters (1 to 3 Gyrs) represent one of the most challenging test for the theory of AGB evolution and nucleosynthesis. Their masses (1.3 to 2.5 M_\odot) coincides with those of the stars responsible for the Galactic production of the s process main and strong components, which include about an h ...
Boötes
Boötes /boʊˈoʊtiːz/ is a constellation in the northern sky, located between 0° and +60° declination, and 13 and 16 hours of right ascension on the celestial sphere. The name comes from the Greek Βοώτης, Boōtēs, meaning herdsman or plowman (literally, ox-driver; from βοῦς bous “cow”). The ""ö"" in the name is a diaeresis, not an umlaut, meaning that each 'o' is to be pronounced separately.One of the 48 constellations described by the 2nd century astronomer Ptolemy, Boötes is now one of the 88 modern constellations. It contains the fourth brightest star in the night sky, the orange-hued Arcturus. Boötes is home to many other bright stars, including eight above the fourth magnitude and an additional 21 above the fifth magnitude, making a total of 29 stars easily visible to the naked eye.