Annual Report 2012 - Max Planck Institute for Astrophysics
... The Max-Planck-Institut für Astrophysik, called had an internationally-recognized numerical astrothe MPA for short, was founded in 1958 under the physics program that is unparalleled by any other directorship of Ludwig Biermann. It was first es- institution of similar size. tablished as an offshoot of ...
... The Max-Planck-Institut für Astrophysik, called had an internationally-recognized numerical astrothe MPA for short, was founded in 1958 under the physics program that is unparalleled by any other directorship of Ludwig Biermann. It was first es- institution of similar size. tablished as an offshoot of ...
AN INITIAL MASS FUNCTION STUDY OF THE DWARF Please share
... Due to the more extended nature of H ii regions surrounding the stellar clusters, aperture sizes that scaled with the cluster mass according to the expected Strömgren radius were used to measure the hydrogen recombination lines on the continuumsubtracted Hα+[N ii] and Pβ images. As was done in Calz ...
... Due to the more extended nature of H ii regions surrounding the stellar clusters, aperture sizes that scaled with the cluster mass according to the expected Strömgren radius were used to measure the hydrogen recombination lines on the continuumsubtracted Hα+[N ii] and Pβ images. As was done in Calz ...
Betelgeuse
... 4. Its brightness has not gotten any dimmer 5. Scientists do not know what will happen to Betelgeuse in the future ...
... 4. Its brightness has not gotten any dimmer 5. Scientists do not know what will happen to Betelgeuse in the future ...
Winter Variable Star Observing Activity in the
... Winter Variable Star Observing Activity in the Constellation Gemini Zeta Geminorum in the Constellation Gemini Most of us are familiar with the winter constellation Orion the Hunter. The constellation Gemini, above and to the northeast of Orion, is also easily visible in the winter nighttime sky. On ...
... Winter Variable Star Observing Activity in the Constellation Gemini Zeta Geminorum in the Constellation Gemini Most of us are familiar with the winter constellation Orion the Hunter. The constellation Gemini, above and to the northeast of Orion, is also easily visible in the winter nighttime sky. On ...
Edexcel GCE - The Student Room
... (b) Infrared radiation is used in chemical analysis. Compared to other radiations, infrared radiation of wavelength 3.3 !m is strongly absorbed by hydrogen chloride gas. As a result of this absorption, the amplitude of oscillations of the hydrogen atoms significantly increases. (i) What name is give ...
... (b) Infrared radiation is used in chemical analysis. Compared to other radiations, infrared radiation of wavelength 3.3 !m is strongly absorbed by hydrogen chloride gas. As a result of this absorption, the amplitude of oscillations of the hydrogen atoms significantly increases. (i) What name is give ...
Extragalactic Distances from Planetary Nebulae
... To produce 600 L of [O III] emission, a central star must have a luminosity of L > 6,000 L. A central star with L > 6,000 L must be more massive than M > 0.6 M. Such stars come from M > 2 M progenitors. ...
... To produce 600 L of [O III] emission, a central star must have a luminosity of L > 6,000 L. A central star with L > 6,000 L must be more massive than M > 0.6 M. Such stars come from M > 2 M progenitors. ...
Submm Observations of Massive Star Formation in the Giant
... Context. How massive stars (M>8 M ) form and how they accrete gas is still an open research field, but it is known that their influence on the interstellar medium (ISM) is immense. Star formation involves the gravitational collapse of gas from scales of giant molecular clouds (GMCs) down to dense h ...
... Context. How massive stars (M>8 M ) form and how they accrete gas is still an open research field, but it is known that their influence on the interstellar medium (ISM) is immense. Star formation involves the gravitational collapse of gas from scales of giant molecular clouds (GMCs) down to dense h ...
Chapter 2 Mass Transfer in Binary Systems
... due to nuclear evolution, or by the contraction of its Roche lobe caused by the loss of angular momentum by gravitational radiation and/or magnetic stellar wind, etc. The radius of the mass-losing star is identical to the Roche lobe radius, and the star remains in thermal equilibrium. ...
... due to nuclear evolution, or by the contraction of its Roche lobe caused by the loss of angular momentum by gravitational radiation and/or magnetic stellar wind, etc. The radius of the mass-losing star is identical to the Roche lobe radius, and the star remains in thermal equilibrium. ...
Stellar Evolution - Astrophysics
... • Luminosity (L). These are usually expressed relative to the solar mass M , the solar radius R and solar luminosity L respectively. In addition, relative abundances of all chemical elements in the photosphere are needed. ...
... • Luminosity (L). These are usually expressed relative to the solar mass M , the solar radius R and solar luminosity L respectively. In addition, relative abundances of all chemical elements in the photosphere are needed. ...
Spectral Line VLBI - Australia Telescope National Facility
... • The maser components are extremely small (mas) and narrow (fractions of a km/s) Measure position and velocity of components with great accuracy ...
... • The maser components are extremely small (mas) and narrow (fractions of a km/s) Measure position and velocity of components with great accuracy ...
lecture course
... The existence of dark halos around galaxies comes from dynamical measurements, X-ray profiles of elliptical galaxies and measurements of gravitational lensing by individual galaxies. The existence of dark matter in galaxy clusters, comes from X-ray, velocity dispersion and gravitational lensing (bot ...
... The existence of dark halos around galaxies comes from dynamical measurements, X-ray profiles of elliptical galaxies and measurements of gravitational lensing by individual galaxies. The existence of dark matter in galaxy clusters, comes from X-ray, velocity dispersion and gravitational lensing (bot ...
Slide 1
... pulses with very short periods) are isolated, highly magnetic neutron stars which radiate energy produced in the slowing down of their rapid spinning motion. Their rotational period is generally less than 1 second and the period is increasing with time. Neutron stars are supported by degeneracy pres ...
... pulses with very short periods) are isolated, highly magnetic neutron stars which radiate energy produced in the slowing down of their rapid spinning motion. Their rotational period is generally less than 1 second and the period is increasing with time. Neutron stars are supported by degeneracy pres ...
Sardinia_SA - Mullard Space Science Laboratory
... polars tend to emit at an approximately constant level, with occasional drops to fainter levels • There is a continuum of levels, but the states tend to be called “high”, “intermediate” and “low” • In low states the accretion rate drops, no reservoir in a disk, so the underlying stars can become vis ...
... polars tend to emit at an approximately constant level, with occasional drops to fainter levels • There is a continuum of levels, but the states tend to be called “high”, “intermediate” and “low” • In low states the accretion rate drops, no reservoir in a disk, so the underlying stars can become vis ...
The formation of carbon dioxide in molecular
... Noble, J.A., Dulieu, F., Congiu, E., & Fraser, H.J., 2011, ApJ, 735, 121 Nummelin, A., Whittet, D.C.B., Gibb, E.L., Gerakines, P.A., & Chiar, J.E., 2001, ApJ, ...
... Noble, J.A., Dulieu, F., Congiu, E., & Fraser, H.J., 2011, ApJ, 735, 121 Nummelin, A., Whittet, D.C.B., Gibb, E.L., Gerakines, P.A., & Chiar, J.E., 2001, ApJ, ...
Estimating the total radiative power output from the hot outer layers
... as a result of three separate satellite missions, i.e. Hubble Space Telescope, International Ultraviolet Explorer and the Extreme Ultraviolet Explorer. Solar observational data of active regions, coronal holes, sunspots, `quiescent' regions and ares were also used. Based on the derived total power ...
... as a result of three separate satellite missions, i.e. Hubble Space Telescope, International Ultraviolet Explorer and the Extreme Ultraviolet Explorer. Solar observational data of active regions, coronal holes, sunspots, `quiescent' regions and ares were also used. Based on the derived total power ...
A timeline of the universe
... recombination. The current dominance of ionized hydrogen is one reason we can see so far with optical telescopes. The Dark Ages were the epoch of cosmic history between the initial formation of neutral hydrogen and its eventual destruction. What was it, however, that illuminated the universe with th ...
... recombination. The current dominance of ionized hydrogen is one reason we can see so far with optical telescopes. The Dark Ages were the epoch of cosmic history between the initial formation of neutral hydrogen and its eventual destruction. What was it, however, that illuminated the universe with th ...
A Reappraisal of The Habitability of Planets around M Dwarf Stars
... magnitude measurements, where the letter indicates the spectral band and response of the receiver, e.g., MV denotes absolute magnitude as measured in the visual or V band. The difficulty comes in practice when not all “V” bands are the same, but that level of detail is beyond the scope of this paper ...
... magnitude measurements, where the letter indicates the spectral band and response of the receiver, e.g., MV denotes absolute magnitude as measured in the visual or V band. The difficulty comes in practice when not all “V” bands are the same, but that level of detail is beyond the scope of this paper ...
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.