Stellar Populations of Dwarf Elliptical Galaxies: UBVRI Photometry
... of low luminosity galaxies. At the same time, Virgo is dynamically young (e.g., Tully & Shaya 1984) and contains several substructural units (Binggeli et al. 1987); thus, with a well selected sample it may be possible to study the evolution of dwarf elliptical galaxies within the cluster itself. Rec ...
... of low luminosity galaxies. At the same time, Virgo is dynamically young (e.g., Tully & Shaya 1984) and contains several substructural units (Binggeli et al. 1987); thus, with a well selected sample it may be possible to study the evolution of dwarf elliptical galaxies within the cluster itself. Rec ...
The properties of a spectroscopically selected sample of cataclysmic variables Amornrat Aungwerojwit
... of cataclysmic variable (CV) evolution with relatively few modifications. The predictions made by this theory, however, are in strong disagreement with the observations. These discrepancies may, at least in part, be related to observational selection effects. In order to circumvent observational bia ...
... of cataclysmic variable (CV) evolution with relatively few modifications. The predictions made by this theory, however, are in strong disagreement with the observations. These discrepancies may, at least in part, be related to observational selection effects. In order to circumvent observational bia ...
Descartes and sunspots: Matters of fact and systematizing strategies
... third element (terrestrial matter) are neither present in the cosmogony, nor produced by the cosmogonical process. They come into being from (some types of) first matter—and may also be transformed back into it—only during the business as usual cosmological patterns of activity on the surfaces of st ...
... third element (terrestrial matter) are neither present in the cosmogony, nor produced by the cosmogonical process. They come into being from (some types of) first matter—and may also be transformed back into it—only during the business as usual cosmological patterns of activity on the surfaces of st ...
Gamma-Ray Bursts and Puzzles of Core
... Discovery of relation between long-duration gamma-ray bursts (GRBs) and SNe is the most important progress in this domain during recent 10 years. Now the search for SN signs in photometry and spectra of GRB afterglows became the main observational direction both for large ground-based telescopes an ...
... Discovery of relation between long-duration gamma-ray bursts (GRBs) and SNe is the most important progress in this domain during recent 10 years. Now the search for SN signs in photometry and spectra of GRB afterglows became the main observational direction both for large ground-based telescopes an ...
Stellar Oscillations Lecture Notes on Jørgen Christensen-Dalsgaard
... In parallel with these developments, it has come to be realized that some, and probably very many, stars pulsate in more complicated manners than the Cepheids. In many instances more than one mode of oscillation is excited simultaneously in a star; these modes may include both radial overtones, in a ...
... In parallel with these developments, it has come to be realized that some, and probably very many, stars pulsate in more complicated manners than the Cepheids. In many instances more than one mode of oscillation is excited simultaneously in a star; these modes may include both radial overtones, in a ...
W.M. Keck Observatory Annual Report 2009
... One of the highlights of 2009 took place in January when a team of astronomers led by NASA’s Mike Mumma reported the first definitive detection of methane in the atmosphere of Mars. Described in detail in the Discoveries section of the Report, their research indicates the Red Planet is either ...
... One of the highlights of 2009 took place in January when a team of astronomers led by NASA’s Mike Mumma reported the first definitive detection of methane in the atmosphere of Mars. Described in detail in the Discoveries section of the Report, their research indicates the Red Planet is either ...
Tuomas Kangas
... their lives in tremendously energetic explosions. New observations of SNe eventually verified this claim. Other types of SNe were also found, caused by e.g. the terminal explosions of WDs in so-called thermonuclear SNe. Nowadays, new SNe are discovered by the hundreds each year, as several new trans ...
... their lives in tremendously energetic explosions. New observations of SNe eventually verified this claim. Other types of SNe were also found, caused by e.g. the terminal explosions of WDs in so-called thermonuclear SNe. Nowadays, new SNe are discovered by the hundreds each year, as several new trans ...
The old globular cluster system of the dIrr galaxy NGC 1427A in the
... (2000) and Harris (2003). In all these models, the GCSs of low-mass dwarf galaxies, the most numerous galaxy type in galaxy clusters (Sandage 2005, and references therein), are envisioned as the building blocks of the GCSs of the more massive galaxies. At present the role of the GCSs of dIrr galaxie ...
... (2000) and Harris (2003). In all these models, the GCSs of low-mass dwarf galaxies, the most numerous galaxy type in galaxy clusters (Sandage 2005, and references therein), are envisioned as the building blocks of the GCSs of the more massive galaxies. At present the role of the GCSs of dIrr galaxie ...
A catalogue of the Chandra Deep Field South with multi
... morphological data for 63,501 objects. The catalogue also contains multi-colour classification into the categories Star, Galaxy and Quasar as well as photometric redshifts. We include restframe luminosities in Johnson, SDSS and Bessell passbands and estimated errors. The redshifts are most reliable ...
... morphological data for 63,501 objects. The catalogue also contains multi-colour classification into the categories Star, Galaxy and Quasar as well as photometric redshifts. We include restframe luminosities in Johnson, SDSS and Bessell passbands and estimated errors. The redshifts are most reliable ...
act_science_bellringers
... 24. H—“ Gravity causes part of a cloud of gas and dust to collapse and heat up”; gravitational force is the only one mentioned in the passage. 25. B—“ hydrogen to make helium in a shell surrounding its center.” This answer comes straight from the passage, and the question directs you to find the ans ...
... 24. H—“ Gravity causes part of a cloud of gas and dust to collapse and heat up”; gravitational force is the only one mentioned in the passage. 25. B—“ hydrogen to make helium in a shell surrounding its center.” This answer comes straight from the passage, and the question directs you to find the ans ...
The Project Gutenberg eBook #32000: An
... If one is to know the sky, and not simply know about it, a knowledge of the coördinate systems is indispensable, but they always present some difficulties when they are encountered at the beginning of the subject. It is believed that the present treatment prepares so thoroughly for their study and l ...
... If one is to know the sky, and not simply know about it, a knowledge of the coördinate systems is indispensable, but they always present some difficulties when they are encountered at the beginning of the subject. It is believed that the present treatment prepares so thoroughly for their study and l ...
Transit of Venus Program-Script with Image and Time Cues
... Don’t worry about the name. People always confuse my name with Bill Haley and the Comets, which was a famous rock n’ roll group in the 1950’s… And you thought I was just an astronomer. Anyway, I was the one who predicted the comet. Though I never actually saw my namesake comet, I predicted it would ...
... Don’t worry about the name. People always confuse my name with Bill Haley and the Comets, which was a famous rock n’ roll group in the 1950’s… And you thought I was just an astronomer. Anyway, I was the one who predicted the comet. Though I never actually saw my namesake comet, I predicted it would ...
Lab 14 Galaxy Morphology
... glowing hydrogen gas within the Milky Way galaxy (HII regions), others (some of which resembled pinwheels) were true galaxies–similar to the Milky Way in size and structure, but millions of light years from us. It was not until the 1920’s that the actual nature of galaxies was confirmed–they were tr ...
... glowing hydrogen gas within the Milky Way galaxy (HII regions), others (some of which resembled pinwheels) were true galaxies–similar to the Milky Way in size and structure, but millions of light years from us. It was not until the 1920’s that the actual nature of galaxies was confirmed–they were tr ...
A Universal Stellar Initial Mass Function? A Critical Look Further
... inferring a stellar population’s IMF from its measured PDMF and adopted SFH. It is somewhat disconcerting that the break from the Salpeter law identified in many IMF studies needs to be invoked near the place where the correction becomes important (around 1 M% ). Knowledge of the SFH of the Galaxy i ...
... inferring a stellar population’s IMF from its measured PDMF and adopted SFH. It is somewhat disconcerting that the break from the Salpeter law identified in many IMF studies needs to be invoked near the place where the correction becomes important (around 1 M% ). Knowledge of the SFH of the Galaxy i ...
Horace Welcome Babcock - National Academy of Sciences
... did not decline outside the galaxy’s luminous bulk. Rather, it continued to rise to the outer angular limits of Horace’s observations. This behavior was contrary to the expectations for Keplerian motion about a central gravitating body (in which velocity decreases inversely as the square root of dis ...
... did not decline outside the galaxy’s luminous bulk. Rather, it continued to rise to the outer angular limits of Horace’s observations. This behavior was contrary to the expectations for Keplerian motion about a central gravitating body (in which velocity decreases inversely as the square root of dis ...
Understanding Variable Stars - Central Florida Astronomical Society
... perspective, an introduction to stars in general, the techniques for discovering and studying variable stars, and a description of the main types of variable stars. It ends with short reflections about the connection between the study of variable stars, and research, education, amateur astronomy, and ...
... perspective, an introduction to stars in general, the techniques for discovering and studying variable stars, and a description of the main types of variable stars. It ends with short reflections about the connection between the study of variable stars, and research, education, amateur astronomy, and ...
Spectroscopic Atlas for Amateur Astronomers
... stars monographs are available, with fully commented spectra of e.g. Sirius, Procyon and Aldebaran. Unfortunately, such papers are mostly available as “abstracts” only. The download prices for the full versions are usually pretty high. Very useful is Spectroweb [59], to find on the home page of Dr. ...
... stars monographs are available, with fully commented spectra of e.g. Sirius, Procyon and Aldebaran. Unfortunately, such papers are mostly available as “abstracts” only. The download prices for the full versions are usually pretty high. Very useful is Spectroweb [59], to find on the home page of Dr. ...
White dwarf binary
... temporarily appears much brighter The explosion drives accreted matter out into space ...
... temporarily appears much brighter The explosion drives accreted matter out into space ...
the strange case of claudius ptolemy
... He had no better way to find the time than to calculate it from the best available theory of the sun. As it happens, the time that this unknown person calculated is in error by about 28 hours. That innocent act has caused untold grief to students of the Athenian calendar, who have assumed that the ...
... He had no better way to find the time than to calculate it from the best available theory of the sun. As it happens, the time that this unknown person calculated is in error by about 28 hours. That innocent act has caused untold grief to students of the Athenian calendar, who have assumed that the ...