The Big Bang
... into a spiral galaxy (by conservation of angular momentum) • Disks of galaxies are very fragile; if they get hit with anything bigger than 10% of their own mass, they are destroyed (and don’t come back) • Collisions of galaxies in clusters was much more common in the past than at present ...
... into a spiral galaxy (by conservation of angular momentum) • Disks of galaxies are very fragile; if they get hit with anything bigger than 10% of their own mass, they are destroyed (and don’t come back) • Collisions of galaxies in clusters was much more common in the past than at present ...
PowerPoint Presentation - Isolated Neutron Stars, solid crust
... Over the last few years, intense observational resources have been devoted to study the faint thermal emission from neutron stars and to search for features in their spectrum. Isolated neutron stars play a key role in compact objects astrophysics: these are the only sources in which we can see direc ...
... Over the last few years, intense observational resources have been devoted to study the faint thermal emission from neutron stars and to search for features in their spectrum. Isolated neutron stars play a key role in compact objects astrophysics: these are the only sources in which we can see direc ...
Spiral arm structures revealed in the M31 galaxy
... Striking regularities are found in the northwestern arm of the M31 galaxy. Star complexes located in this arm are spaced 1.2 kpc apart and have similar sizes of about 0.6 kpc. This pattern is observed within the arm region where Beck et al. (1989) detected a strong regular magnetic field with the wa ...
... Striking regularities are found in the northwestern arm of the M31 galaxy. Star complexes located in this arm are spaced 1.2 kpc apart and have similar sizes of about 0.6 kpc. This pattern is observed within the arm region where Beck et al. (1989) detected a strong regular magnetic field with the wa ...
High-mass star-forming cloud G0.38+0.04 in the Galactic center dust
... One possibility is that these rare masers trace a very short period in the lifetime of the forming high-mass YSO. Both masers may trace either an outflow or a disk (Eisner et al. 2002; Goddi et al. 2009a), but the conditions that allow them to mase may in either case last for a very short time. In t ...
... One possibility is that these rare masers trace a very short period in the lifetime of the forming high-mass YSO. Both masers may trace either an outflow or a disk (Eisner et al. 2002; Goddi et al. 2009a), but the conditions that allow them to mase may in either case last for a very short time. In t ...
Document
... as a fuel. During its main sequence a star will release energy by combining hydrogen and helium nuclei (light elements) into _________ elements. Any element in space that is heavier than helium is thought to have been made in a star. Words – heavier, balanced, hydrogen, nuclear, temperatures ...
... as a fuel. During its main sequence a star will release energy by combining hydrogen and helium nuclei (light elements) into _________ elements. Any element in space that is heavier than helium is thought to have been made in a star. Words – heavier, balanced, hydrogen, nuclear, temperatures ...
Things are looking up
... Yes indeed there is a structure. The booklet is presented in eight units. The first five units are devoted to spending time under the night sky. Within these units you will find ideas for twenty practical projects. In general the simplest activities come first. We start with naked eye observing and ...
... Yes indeed there is a structure. The booklet is presented in eight units. The first five units are devoted to spending time under the night sky. Within these units you will find ideas for twenty practical projects. In general the simplest activities come first. We start with naked eye observing and ...
The potential of the variable DA white dwarf G117–B15A as
... candidates to test the existence of several weakly interacting massive particles. This was recognized early by several authors (see, for instance Raffelt, 1996). There is, however, another important reason for this: white dwarfs are well studied stellar objects since the relative simplicity of the p ...
... candidates to test the existence of several weakly interacting massive particles. This was recognized early by several authors (see, for instance Raffelt, 1996). There is, however, another important reason for this: white dwarfs are well studied stellar objects since the relative simplicity of the p ...
Chapter 4 On the possibility of a helium white dwarf donor in the
... in the flash fuel. The question is: where does the hydrogen and helium come from if not from the donor star? The problem is more severe for hydrogen than for helium because in an evolved donor star like in an ultracompact system the hydrogen can reside only in the outer layers that were lost being o ...
... in the flash fuel. The question is: where does the hydrogen and helium come from if not from the donor star? The problem is more severe for hydrogen than for helium because in an evolved donor star like in an ultracompact system the hydrogen can reside only in the outer layers that were lost being o ...
P1 The Earth in the Universe
... as a fuel. During its main sequence a star will release energy by combining hydrogen and helium nuclei (light elements) into _________ elements. Any element in space that is heavier than helium is thought to have been made in a star. Words – heavier, balanced, hydrogen, nuclear, temperatures ...
... as a fuel. During its main sequence a star will release energy by combining hydrogen and helium nuclei (light elements) into _________ elements. Any element in space that is heavier than helium is thought to have been made in a star. Words – heavier, balanced, hydrogen, nuclear, temperatures ...
6. Stellar Spectra
... upper diagram in order to obtain a correspondence between the observed and computed peaks. ...
... upper diagram in order to obtain a correspondence between the observed and computed peaks. ...
12-1 - Piscataway High School
... The distances to stars are so large that it is not convenient to use astronomical units. As Reasoning with Numbers 12-1 explains, when you measure distance via parallax, it is convenient to use the unit of distance called a parsec (pc). The word parsec was created by combining parallax and second of ...
... The distances to stars are so large that it is not convenient to use astronomical units. As Reasoning with Numbers 12-1 explains, when you measure distance via parallax, it is convenient to use the unit of distance called a parsec (pc). The word parsec was created by combining parallax and second of ...
Ages of young stars
... (l) Cargile and James (2010), (m) Naylor et al. (2009), (n) derived by E. Mamajek using data from Hauck and Mermilliod (1998) and isochrones from Bertelli et al. (2009), (o) Ventura et al. (1998). ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke ...
... (l) Cargile and James (2010), (m) Naylor et al. (2009), (n) derived by E. Mamajek using data from Hauck and Mermilliod (1998) and isochrones from Bertelli et al. (2009), (o) Ventura et al. (1998). ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke ...
radioactive 26a1 in the galaxy: observations versus theory
... target for the HEAO-3 detectors. Moreover it was pointed out that, because of its long mean life, 26A1 would have enough time to be thermalised in the interstellar medium; therefore, it would de-excite essentially at rest and emit a narrow line, making easier its detection and identification with su ...
... target for the HEAO-3 detectors. Moreover it was pointed out that, because of its long mean life, 26A1 would have enough time to be thermalised in the interstellar medium; therefore, it would de-excite essentially at rest and emit a narrow line, making easier its detection and identification with su ...
Ages of Young Stars
... (l) Cargile and James (2010), (m) Naylor et al. (2009), (n) derived by E. Mamajek using data from Hauck and Mermilliod (1998) and isochrones from Bertelli et al. (2009), (o) Ventura et al. (1998). ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke ...
... (l) Cargile and James (2010), (m) Naylor et al. (2009), (n) derived by E. Mamajek using data from Hauck and Mermilliod (1998) and isochrones from Bertelli et al. (2009), (o) Ventura et al. (1998). ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke ...
end-of-summer report
... activity in stars differs depending on which energy band is observed. Thus far, stellar UV emission has proven to be the most convenient medium for detecting magnetic flux variability over long time scales. Simply put, ground based telescopes can easily detect the UV band from stars and this allows ...
... activity in stars differs depending on which energy band is observed. Thus far, stellar UV emission has proven to be the most convenient medium for detecting magnetic flux variability over long time scales. Simply put, ground based telescopes can easily detect the UV band from stars and this allows ...
The chemical composition of two supergiants in the dwarf
... to neglected NLTE and spherical extension effects in the atmospheric structure, as well as NLTE and ξ effects in the line formation calculations. The critical spectral features used to determine the model atmosphere parameters (effective temperature, Teff , and gravity) are the wings of the Hγ line ...
... to neglected NLTE and spherical extension effects in the atmospheric structure, as well as NLTE and ξ effects in the line formation calculations. The critical spectral features used to determine the model atmosphere parameters (effective temperature, Teff , and gravity) are the wings of the Hγ line ...
XMM-Newton discovery of 7 s pulsations in the isolated neutron star
... [email protected], [email protected] ABSTRACT Thanks to the high counting statistics provided by a recent XMM-Newton observation of RX J1856.5–3754 we have discovered that this isolated neutron star pulsates at a period of 7.055 s. This confirms that RX J1856.5–3754 is similar in n ...
... [email protected], [email protected] ABSTRACT Thanks to the high counting statistics provided by a recent XMM-Newton observation of RX J1856.5–3754 we have discovered that this isolated neutron star pulsates at a period of 7.055 s. This confirms that RX J1856.5–3754 is similar in n ...
Pulsed Accretion in the Young Binary &
... low fractional levels over the course of 10 Myr or less. Accretion would also be enhanced by a smaller binary separation and a smaller orbital period (Ostriker et al. 1992). But recently, White and Ghez (2001) found that the mass accretion rates for primary stars are similar to single stars, which s ...
... low fractional levels over the course of 10 Myr or less. Accretion would also be enhanced by a smaller binary separation and a smaller orbital period (Ostriker et al. 1992). But recently, White and Ghez (2001) found that the mass accretion rates for primary stars are similar to single stars, which s ...
The life-cycle of star formation in distant clusters
... concerned with testing short-term changes to old wellestablished galaxies, this should not be a major deficiency. The BC models assume a given initial stellar mass function (IMF) and star formation history and output, as a function of time, observables such as spectral energy distributions (SEDs), a ...
... concerned with testing short-term changes to old wellestablished galaxies, this should not be a major deficiency. The BC models assume a given initial stellar mass function (IMF) and star formation history and output, as a function of time, observables such as spectral energy distributions (SEDs), a ...
Power Point
... • measure H (& nearby [NII] doublet) • calibrate data against other observations ...
... • measure H (& nearby [NII] doublet) • calibrate data against other observations ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.