Stellar Spectroscopy
... Spectroscopy is the study of “what kinds” of light we see from an object. It is a measure of the quantity of each color of light (or more specifically, the amount of each wavelength of light). It is a powerful tool in astronomy. In fact, most of what we know in astronomy is a result of spectroscopy: ...
... Spectroscopy is the study of “what kinds” of light we see from an object. It is a measure of the quantity of each color of light (or more specifically, the amount of each wavelength of light). It is a powerful tool in astronomy. In fact, most of what we know in astronomy is a result of spectroscopy: ...
Star Clusters in Mergers
... What can we say about the Stellar Component in the Antennae ? In our 1999 paper, one of our primary difficulties was differentiating stars from clusters. This led us to conclude that the number of young star clusters in the Antennae was between 800 and 8000, a pretty big range ! Our new ACS data pr ...
... What can we say about the Stellar Component in the Antennae ? In our 1999 paper, one of our primary difficulties was differentiating stars from clusters. This led us to conclude that the number of young star clusters in the Antennae was between 800 and 8000, a pretty big range ! Our new ACS data pr ...
A search for a new class of pulsating DA white dwarf stars in the DB
... Most importantly in the context of this discussion: gravitational settling stratifies the structure of white dwarf stars, and in the presence of such strong gravitational fields it does so quickly. In the absence of any mixing – particularly in the absence of convection – we would expect all white d ...
... Most importantly in the context of this discussion: gravitational settling stratifies the structure of white dwarf stars, and in the presence of such strong gravitational fields it does so quickly. In the absence of any mixing – particularly in the absence of convection – we would expect all white d ...
PH607lec12
... rate as middle-mass galaxies. When astronomers look at the brightest galaxies now compared to the brightest galaxies at an earlier epoch, they don't seem to have gained much mass. It suggests that there might be an upper ceiling to how large a galaxy can grow. Perhaps when a galaxy gets to be very l ...
... rate as middle-mass galaxies. When astronomers look at the brightest galaxies now compared to the brightest galaxies at an earlier epoch, they don't seem to have gained much mass. It suggests that there might be an upper ceiling to how large a galaxy can grow. Perhaps when a galaxy gets to be very l ...
The HERMES GALAH survey: overview
... thick and thin disk stars overlap. The thin disk stars have [Fe/H] in the range 0.7 to +0.5, while most of the thick disk stars have [Fe/H] between about 1 and 0.3, with tails extending to 2 and 0.1. The similarity of the abundance spread of the thick disk stars near the sun to the globular clusters ...
... thick and thin disk stars overlap. The thin disk stars have [Fe/H] in the range 0.7 to +0.5, while most of the thick disk stars have [Fe/H] between about 1 and 0.3, with tails extending to 2 and 0.1. The similarity of the abundance spread of the thick disk stars near the sun to the globular clusters ...
1 - Piscataway High School
... of the gas would weigh more than an automobile. In this degenerate matter, the pressure does not depend on temperature, and that means the pressure–temperature thermostat does not regulate energy production. When the temperature becomes hot enough, helium fusion begins to make energy, and the temper ...
... of the gas would weigh more than an automobile. In this degenerate matter, the pressure does not depend on temperature, and that means the pressure–temperature thermostat does not regulate energy production. When the temperature becomes hot enough, helium fusion begins to make energy, and the temper ...
A Spectroscopic Survey of a Sample of Active M Dwarfs.
... In the case of spectroscopic binaries, the equivalent widths of the Hα emission from each component need to be corrected due to the continuum of the other component. We assume, for lack of any information better than a mass ratio of unity for RX J1547.4+4507, that the components in each binary have ...
... In the case of spectroscopic binaries, the equivalent widths of the Hα emission from each component need to be corrected due to the continuum of the other component. We assume, for lack of any information better than a mass ratio of unity for RX J1547.4+4507, that the components in each binary have ...
1 Astrobiologically Interesting Stars within 10
... may have outlasted their usefulness as abodes of life, if the luminosity increase sustained from zero age to their present evolutionary status surpasses the capability of the planetary thermo-regulating carbonate-silicate cycle. This situation is dependent upon planetary location inside the CHZ, yet ...
... may have outlasted their usefulness as abodes of life, if the luminosity increase sustained from zero age to their present evolutionary status surpasses the capability of the planetary thermo-regulating carbonate-silicate cycle. This situation is dependent upon planetary location inside the CHZ, yet ...
Word version - White dwarf stars and the Chandrasekhar limit
... and others. Sommerfeld left Chandra with some unpublished material of his, on the theory of electrons in metals. Chandra immediately launched into a study of the new material. In a few months Chandra had written a paper of his own, The Compton Scattering and the New Statistics. He felt that the pape ...
... and others. Sommerfeld left Chandra with some unpublished material of his, on the theory of electrons in metals. Chandra immediately launched into a study of the new material. In a few months Chandra had written a paper of his own, The Compton Scattering and the New Statistics. He felt that the pape ...
The Stars - Springer
... Many stars are variable so the value for the apparent magnitude will change. Any variable will have the suffix v, and the value given will be the mean value. ...
... Many stars are variable so the value for the apparent magnitude will change. Any variable will have the suffix v, and the value given will be the mean value. ...
Astronomy Astrophysics First detection of the field star overdensity in the Perseus... &
... the two sets of physical parameters. This cleanest sample contains 8328 stars and is named CS-MB or CS-EC depending on whether their physical parameters were computed using the MB or EC method (see Fig. 1). This sample contains stars with more accurate SPP data, but has fewer statistics owing to the ...
... the two sets of physical parameters. This cleanest sample contains 8328 stars and is named CS-MB or CS-EC depending on whether their physical parameters were computed using the MB or EC method (see Fig. 1). This sample contains stars with more accurate SPP data, but has fewer statistics owing to the ...
17_Testbank
... A) 2 B) 3 C) 4 D) varies depending on the reaction E) none of the above Answer: B 17) The helium fusion process results in the production of A) hydrogen. B) oxygen. C) carbon. D) nitrogen. E) iron. Answer: C 18) What happens after a helium flash? A) The core quickly heats up and expands. B) The star ...
... A) 2 B) 3 C) 4 D) varies depending on the reaction E) none of the above Answer: B 17) The helium fusion process results in the production of A) hydrogen. B) oxygen. C) carbon. D) nitrogen. E) iron. Answer: C 18) What happens after a helium flash? A) The core quickly heats up and expands. B) The star ...
Computer Lecture Notes
... computations that accompany the study of the history of astronomy, in particular the pre-telescopic history. The discussion is based on practical examples, of gradually increasing complexity. There are two reasons which makes such a course timely. First, in the 20st century astronomy has turned more ...
... computations that accompany the study of the history of astronomy, in particular the pre-telescopic history. The discussion is based on practical examples, of gradually increasing complexity. There are two reasons which makes such a course timely. First, in the 20st century astronomy has turned more ...
Sky Watcher - Boise Astronomical Society
... and fainter Mercury lower in the northwest. Mercury and Jupiter will be the brightest two stars between the west and northwest. There’s a possible new meteor shower in the offing! The reason is that Comet LINEAR 209P, which an automated telescope discovered in 2004, is passing through the inner sola ...
... and fainter Mercury lower in the northwest. Mercury and Jupiter will be the brightest two stars between the west and northwest. There’s a possible new meteor shower in the offing! The reason is that Comet LINEAR 209P, which an automated telescope discovered in 2004, is passing through the inner sola ...
Age-Dating of Young Stars and Stellar Systems
... The central theme of this conference is the chronometry of stellar systems. Applied to very young systems, observations of the UV (∼1500 Å) and far-UV (< 912 Å) and a theoretical calibration of the age vs. UV luminosity are required. The age vs. optical-luminosity relation is highly degenerate due ...
... The central theme of this conference is the chronometry of stellar systems. Applied to very young systems, observations of the UV (∼1500 Å) and far-UV (< 912 Å) and a theoretical calibration of the age vs. UV luminosity are required. The age vs. optical-luminosity relation is highly degenerate due ...
Lithium abundances along the red giant branch: FLAMES
... agreed with the expected value for the difference in heliocentric correction, and the same shift was found for all spectra obtained at a given time. Therefore, we can exclude that these shifts are the result of orbital motion in a binary system. No other velocity shifts were found within the accuracy ...
... agreed with the expected value for the difference in heliocentric correction, and the same shift was found for all spectra obtained at a given time. Therefore, we can exclude that these shifts are the result of orbital motion in a binary system. No other velocity shifts were found within the accuracy ...
Discovery of White Dwarfs—1 Oct • Adams’ discovery
... • Apparent mag is a logarithmetic expression of flux • If the apparent mag changes by −2.5, the flux is brighter by a factor of 10. • Fluxes and magnitudes of two stars A and B ...
... • Apparent mag is a logarithmetic expression of flux • If the apparent mag changes by −2.5, the flux is brighter by a factor of 10. • Fluxes and magnitudes of two stars A and B ...
T
... velocity measurements. This is most impressively shown by the measurement series presented in Figure 2b. Both fibres have been exposed repetitively with the ThAr calibration light and the drift – expressed in m/s – was computed as a function of time. During several hours the total drift remains well ...
... velocity measurements. This is most impressively shown by the measurement series presented in Figure 2b. Both fibres have been exposed repetitively with the ThAr calibration light and the drift – expressed in m/s – was computed as a function of time. During several hours the total drift remains well ...
2 The Concept of “Spectral Classes”
... All stars including the standards are peculiar at some level. Hence, the most complicated part of any classification system is the array of spectral peculiarities, usually designated by a single letter or character. The descriptions of these attributes, P1P2P3P4, each of which has a value in the ran ...
... All stars including the standards are peculiar at some level. Hence, the most complicated part of any classification system is the array of spectral peculiarities, usually designated by a single letter or character. The descriptions of these attributes, P1P2P3P4, each of which has a value in the ran ...
The DBV stars: Progress and problems
... essentially unchanged. Other values, such as the seismological parallax also changed; the best parallax distance is now about 45 pc, and logg = 7.95. Provencal et al. (1995) find a slightly hotter temperature of 27,000 K. Depending on the carbon mass fraction in the core, I will probably be able to ...
... essentially unchanged. Other values, such as the seismological parallax also changed; the best parallax distance is now about 45 pc, and logg = 7.95. Provencal et al. (1995) find a slightly hotter temperature of 27,000 K. Depending on the carbon mass fraction in the core, I will probably be able to ...
The first photometric analysis of the overcontact binary MQ UMa with
... 2006, 2011). It has been widely accepted that the eruption of V1309 Sco was the result of a cool short-period binary merging. In this paper, we focus on the high fill-out, low mass ratio overcontact binaries which are at the late evolutionary stages of the contact configuration. Photometric analysis ...
... 2006, 2011). It has been widely accepted that the eruption of V1309 Sco was the result of a cool short-period binary merging. In this paper, we focus on the high fill-out, low mass ratio overcontact binaries which are at the late evolutionary stages of the contact configuration. Photometric analysis ...
Lecture 12: Evolution of the Galaxy
... ASTR112 The Galaxy Lecture 12 • The Galaxy is presumed to have started from a huge extended low density cloud of H and He • This underwent rapid gravitational collapse over ~2 × 108 years (halo era) during which time the Population II stars were formed, all with low metallicity • As collapse procee ...
... ASTR112 The Galaxy Lecture 12 • The Galaxy is presumed to have started from a huge extended low density cloud of H and He • This underwent rapid gravitational collapse over ~2 × 108 years (halo era) during which time the Population II stars were formed, all with low metallicity • As collapse procee ...
Bez nadpisu
... marked. Rodrigues-Gil et al., marked that during JanuaryFebruary 2001, the heights of both maxima and the depths of the minima were essentially the same, but in October 2005, differences between them could be seen. These curves are very similar to our curves constructed using data obtained prior to ...
... marked. Rodrigues-Gil et al., marked that during JanuaryFebruary 2001, the heights of both maxima and the depths of the minima were essentially the same, but in October 2005, differences between them could be seen. These curves are very similar to our curves constructed using data obtained prior to ...
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.