Star Clusters - Caltech Astronomy
... clusters in the Galaxy have probably not yet been found, since open clusters are found near the Galactic plane where the interstellar dust is the most opaque. There may be as many as 105 open clusters in the Galaxy. The smallest of the open clusters contain fewer than a dozen stars, so the minimum m ...
... clusters in the Galaxy have probably not yet been found, since open clusters are found near the Galactic plane where the interstellar dust is the most opaque. There may be as many as 105 open clusters in the Galaxy. The smallest of the open clusters contain fewer than a dozen stars, so the minimum m ...
Stellar evolution – Part III of III - Inside Mines
... The fate of low / medium mass (“Sun-like”) stars • The source of the star’s energy (He burning) is eventually exhausted inside the core, which is now composed of carbon and oxygen • The core begins to contract without outward thermal pressure of fusion process. The contraction leads to further heat ...
... The fate of low / medium mass (“Sun-like”) stars • The source of the star’s energy (He burning) is eventually exhausted inside the core, which is now composed of carbon and oxygen • The core begins to contract without outward thermal pressure of fusion process. The contraction leads to further heat ...
MPhil Thesis - Final - Suzanne Knight
... white dwarfs make them ideal candidates for detecting low mass objects such as brown dwarfs and gas giant planets. ! Theoretical predictions generally agree that a star will consume and destroy close-in, low mass planets as it ascends the red giant and asymptotic giant branch evolutionary tracks, bu ...
... white dwarfs make them ideal candidates for detecting low mass objects such as brown dwarfs and gas giant planets. ! Theoretical predictions generally agree that a star will consume and destroy close-in, low mass planets as it ascends the red giant and asymptotic giant branch evolutionary tracks, bu ...
Joint formation of QSOs and spheroids: QSOs as clocks of star
... relationship between the formation of QSOs and their spheroid hosts, with particular emphasis on the timing of star formation in the hosts and the QSO shining. We derive the formation rate of the spheroids from the formation rate of the QSOs (Sections 2.1 and 2.2), taking into account the observatio ...
... relationship between the formation of QSOs and their spheroid hosts, with particular emphasis on the timing of star formation in the hosts and the QSO shining. We derive the formation rate of the spheroids from the formation rate of the QSOs (Sections 2.1 and 2.2), taking into account the observatio ...
ALMA Science Results
... – Vibrationally excited molecules probe central regions but HCN and HCO+ are very optically thick owing to steep T gradient and large column – Even may see self absorption in vibrationally excited lines. If starburst, a very hot one. Results consistent with a supermassive Black Hole accreting near E ...
... – Vibrationally excited molecules probe central regions but HCN and HCO+ are very optically thick owing to steep T gradient and large column – Even may see self absorption in vibrationally excited lines. If starburst, a very hot one. Results consistent with a supermassive Black Hole accreting near E ...
Star formation in a galactic outflow
... to the morphological evolution of galaxies12, to the evolution in size and velocity dispersion of the spheroidal component of galaxies11,13, and would contribute to the population of highvelocity stars, which could even escape the galaxy13. Such star formation could provide in-situ chemical enrichme ...
... to the morphological evolution of galaxies12, to the evolution in size and velocity dispersion of the spheroidal component of galaxies11,13, and would contribute to the population of highvelocity stars, which could even escape the galaxy13. Such star formation could provide in-situ chemical enrichme ...
celestial navigation heaven`s guide for mere
... and dust around the stars may be residual material from their formation or simply interstellar clouds the cluster is passing through. All stars are different in terms of size, colour and brightness as mentioned in the earlier paragraphs. These characteristics differ due to the stars’ differing mass. ...
... and dust around the stars may be residual material from their formation or simply interstellar clouds the cluster is passing through. All stars are different in terms of size, colour and brightness as mentioned in the earlier paragraphs. These characteristics differ due to the stars’ differing mass. ...
TOPS: Toward Other Planetary
... more or less contemporaneously through a sequence of related and almost deterministic events, as the interior of a spinning interstellar cloud collapses under the influence of its own gravity. The spin of the collapsing matter forces some of the material to whirl about the center in a thin, disk-sha ...
... more or less contemporaneously through a sequence of related and almost deterministic events, as the interior of a spinning interstellar cloud collapses under the influence of its own gravity. The spin of the collapsing matter forces some of the material to whirl about the center in a thin, disk-sha ...
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 ...
Habitable Zone Lifetimes of Exoplanets around Main Sequence Stars
... et al., 2007). More-sophisticated climate modeling approaches are required to fully constrain the complex effect that clouds, in atmospheres of varying compositions, will have on planetary climate under different stellar environments. The carbon-silicate cycle is fundamental in determining the CO2 m ...
... et al., 2007). More-sophisticated climate modeling approaches are required to fully constrain the complex effect that clouds, in atmospheres of varying compositions, will have on planetary climate under different stellar environments. The carbon-silicate cycle is fundamental in determining the CO2 m ...
Do We Know of Any Maunder Minimum Stars?
... The six specific examples of young, chromospherically inactive stars cited in the above works are: HD 9562 by Baliunas et al. (1995a), HD 167215 and HD 101177 by Donahue (1998), HD 45067, HD 89744, and HD 178428 by Saar (1998). According to the analysis here (§3.1) five of these stars, HD 9562, HD 1 ...
... The six specific examples of young, chromospherically inactive stars cited in the above works are: HD 9562 by Baliunas et al. (1995a), HD 167215 and HD 101177 by Donahue (1998), HD 45067, HD 89744, and HD 178428 by Saar (1998). According to the analysis here (§3.1) five of these stars, HD 9562, HD 1 ...
ASPEN WORKSHOP 2003
... ellipticals, larger in bluer galaxies, up to few tenths. AI(Red), or AI(Blue) >0.3 suggests interaction, as in half of ULIRGS [as long as they are identified as “single galaxy”!] Simulations show that AI stays above 0.35 for about 700 Myears, but NOT for face-on HDF application: rest frame B morphol ...
... ellipticals, larger in bluer galaxies, up to few tenths. AI(Red), or AI(Blue) >0.3 suggests interaction, as in half of ULIRGS [as long as they are identified as “single galaxy”!] Simulations show that AI stays above 0.35 for about 700 Myears, but NOT for face-on HDF application: rest frame B morphol ...
The Milky Way disk
... mechanism, like for instance streaming motions. The same Oort formulae cannot be used outside the solar ring, and other independent distance indicators have to be adopted. Besides this, other limitations are that our galaxy is filled with HI, and apparently inter-arm regions have the same physical s ...
... mechanism, like for instance streaming motions. The same Oort formulae cannot be used outside the solar ring, and other independent distance indicators have to be adopted. Besides this, other limitations are that our galaxy is filled with HI, and apparently inter-arm regions have the same physical s ...
Astrophysics Pristine CNO abundances from Magellanic Cloud B stars
... the UVES exposure time calculator on the one hand and the preselection on the other. Figure 1 shows the pipeline reduction result for the two spectra of C9 in the region surrounding Hβ. hel Except for B18, the heliocentric radial velocities vrad are fully compatible with that deduced for the cluster ...
... the UVES exposure time calculator on the one hand and the preselection on the other. Figure 1 shows the pipeline reduction result for the two spectra of C9 in the region surrounding Hβ. hel Except for B18, the heliocentric radial velocities vrad are fully compatible with that deduced for the cluster ...
Constraining the star formation histories of spiral bulges
... possibility is an initial mass function (IMF) biased towards highmass stars in the early stages of galaxy formation. In this scenario the first few generations of stars generate large quantities of metals (Gibson & Matteucci 1997; Vazdekis et al. 1997). Alternatively, a period of star formation (SF) ...
... possibility is an initial mass function (IMF) biased towards highmass stars in the early stages of galaxy formation. In this scenario the first few generations of stars generate large quantities of metals (Gibson & Matteucci 1997; Vazdekis et al. 1997). Alternatively, a period of star formation (SF) ...
Magnitude-range brightness variations of overactive K giants
... Strassmeier 2009 and the many references therein). However, in some cases, the amplitude of the long-term variation is far larger than the rotational modulation itself and exceeds the limits from spot additivity (which is also subject of the stellar inclination). The question arises if it is possibl ...
... Strassmeier 2009 and the many references therein). However, in some cases, the amplitude of the long-term variation is far larger than the rotational modulation itself and exceeds the limits from spot additivity (which is also subject of the stellar inclination). The question arises if it is possibl ...
Notes on Stars
... The extinction to star clusters can be determined, e.g., from a 2-colour-diagram, (especially the U-V vs B-V diagram where the reddening vector is slightly shallower than the ...
... The extinction to star clusters can be determined, e.g., from a 2-colour-diagram, (especially the U-V vs B-V diagram where the reddening vector is slightly shallower than the ...
Stellar Remnants White Dwarfs Type Ia Supernovae Neutron Stars
... • size R ~ thousands of kilometers • mass M ~ mass of stars • density absurdly high: – white dwarf matter is roughly a million times denser than water – instead of weighing a gram, an ice cube block of white dwarf material would weigh a ton. ...
... • size R ~ thousands of kilometers • mass M ~ mass of stars • density absurdly high: – white dwarf matter is roughly a million times denser than water – instead of weighing a gram, an ice cube block of white dwarf material would weigh a ton. ...
Pdf - Text of NPTEL IIT Video Lectures
... wave packet so the simple wave packet is a one dimensional packet that we had considered that psi of x is equal to I consider this as a super position of plane waves under root of two pi h cross minus infinity a one dimensional wave packet a of p E to the power of i by h cross p x d p. Now the expec ...
... wave packet so the simple wave packet is a one dimensional packet that we had considered that psi of x is equal to I consider this as a super position of plane waves under root of two pi h cross minus infinity a one dimensional wave packet a of p E to the power of i by h cross p x d p. Now the expec ...
Explosive sources of the highest energy radiation
... the gamma-ray emission would be absorbed through pair production on soft X-ray photons coming from the disc. Gamma-ray emission was again detected from Cyg X-3 in 2011 during a giant radio flare (Corbel et al. 2012). However, analysis of this outburst also identified detectable gamma-ray activity as ...
... the gamma-ray emission would be absorbed through pair production on soft X-ray photons coming from the disc. Gamma-ray emission was again detected from Cyg X-3 in 2011 during a giant radio flare (Corbel et al. 2012). However, analysis of this outburst also identified detectable gamma-ray activity as ...
Lyra
Lyra (/ˈlaɪərə/; Latin for lyre, from Greek λύρα) is a small constellation. It is one of 48 listed by the 2nd century astronomer Ptolemy, and is one of the 88 constellations recognized by the International Astronomical Union. Lyra was often represented on star maps as a vulture or an eagle carrying a lyre, and hence sometimes referred to as Aquila Cadens or Vultur Cadens. Beginning at the north, Lyra is bordered by Draco, Hercules, Vulpecula, and Cygnus. Lyra is visible from the northern hemisphere from spring through autumn, and nearly overhead, in temperate latitudes, during the summer months. From the southern hemisphere, it is visible low in the northern sky during the winter months.The lucida or brightest star—and one of the brightest stars in the sky—is the white main sequence star Vega, a corner of the Summer Triangle. Beta Lyrae is the prototype of a class of stars known as Beta Lyrae variables, binary stars so close to each other that they become egg-shaped and material flows from one to the other. Epsilon Lyrae, known informally as the Double Double, is a complex multiple star system. Lyra also hosts the Ring Nebula, the second-discovered and best-known planetary nebula.