I Introduction to the Interstellar Medium
... The Diffuse ISM (early 20th century) The first observational evidence that there was a general ISM that pervaded the space between the stars came from photographic spectroscopy of spectroscopic binary stars early in the 20th century. It was noticed that in addition to the relatively broad absorption ...
... The Diffuse ISM (early 20th century) The first observational evidence that there was a general ISM that pervaded the space between the stars came from photographic spectroscopy of spectroscopic binary stars early in the 20th century. It was noticed that in addition to the relatively broad absorption ...
unit1-19
... observed was red shifted. So he presumed all stars and galaxies were moving apart. He quantified the redshift (z) as “the ratio of the change in wavelength to the wavelength with the source at rest”. In short … ...
... observed was red shifted. So he presumed all stars and galaxies were moving apart. He quantified the redshift (z) as “the ratio of the change in wavelength to the wavelength with the source at rest”. In short … ...
Variation of Elements in Nature
... the geological history of the earth would be different. Even in the supposed void of interstellar space, cosmic rays undergo transmutations by interacting with thinly dispersed interstellar matter to produce typical light and medium weight elements which give a clue to their origin, age etc. If nucl ...
... the geological history of the earth would be different. Even in the supposed void of interstellar space, cosmic rays undergo transmutations by interacting with thinly dispersed interstellar matter to produce typical light and medium weight elements which give a clue to their origin, age etc. If nucl ...
Our galaxy - School of Physics
... width is hard to define because it does not have sharp boundaries. Stars like the Sun lie within 500 pc above and below the central plane; the youngest stars lie within 50 pc. ...
... width is hard to define because it does not have sharp boundaries. Stars like the Sun lie within 500 pc above and below the central plane; the youngest stars lie within 50 pc. ...
Activity: Multiwavelength Bingo - Chandra X
... billion years from now. This composite of data from NASA's Chandra X-ray Observatory and Hubble Space Telescope shows various features of this socalled planetary nebula. When a star like the Sun begins to run out of fuel, it becomes a red giant. In X-RAY this phase, a star sheds some of its outer la ...
... billion years from now. This composite of data from NASA's Chandra X-ray Observatory and Hubble Space Telescope shows various features of this socalled planetary nebula. When a star like the Sun begins to run out of fuel, it becomes a red giant. In X-RAY this phase, a star sheds some of its outer la ...
The extended structure of the dwarf irregular galaxy Sagittarius⋆⋆⋆
... In this paper we present the results of the same kind of analysis as performed with the VIMOS camera at the ESO Very Large Telescope (VLT) of our first southern target, the dwarf irregular galaxy Sagittarius (Sgr dIrr1 ). Sgr dIrr is a faint starforming galaxy (see Momany et al. 2005, hereafter M05) ...
... In this paper we present the results of the same kind of analysis as performed with the VIMOS camera at the ESO Very Large Telescope (VLT) of our first southern target, the dwarf irregular galaxy Sagittarius (Sgr dIrr1 ). Sgr dIrr is a faint starforming galaxy (see Momany et al. 2005, hereafter M05) ...
Gas IN - STScI
... • The ATLAS3D survey, and the paradigm shift from E/S0s to Fast and Slow rotators • The Warm and Cold gas content of early-type galaxies • Gas IN - On the origin of the gas. External accretion vs. recycling • Gas OUT - Ending up in stars. Modes of star-formation in ETGs - Pushed away by AGN feedback ...
... • The ATLAS3D survey, and the paradigm shift from E/S0s to Fast and Slow rotators • The Warm and Cold gas content of early-type galaxies • Gas IN - On the origin of the gas. External accretion vs. recycling • Gas OUT - Ending up in stars. Modes of star-formation in ETGs - Pushed away by AGN feedback ...
Alpha Centauri 3
... The distance separating Alpha Centauri A from its companion star B averages 23.7 AUs (semi-major axis of 17.57" with a HIPPARCOS distance estimate of 4.40 light-years). The stars swings between 11.4 and 36.0 AUs away in a highly elliptical orbit (e= 0.52) that takes almost 80 (79.90) years to comple ...
... The distance separating Alpha Centauri A from its companion star B averages 23.7 AUs (semi-major axis of 17.57" with a HIPPARCOS distance estimate of 4.40 light-years). The stars swings between 11.4 and 36.0 AUs away in a highly elliptical orbit (e= 0.52) that takes almost 80 (79.90) years to comple ...
Astronomy 252: Short Project 2 Stellar Spectra: Their Classification
... stars in the sky have temperatures in excess of 40,000 K, whereas the coolest stars that we can detect optically have temperatures on the order of 2000 - 3000 K. As you might guess, the appearance of the spectrum of a star is very strongly dependent on its temperature. For instance the very hottest ...
... stars in the sky have temperatures in excess of 40,000 K, whereas the coolest stars that we can detect optically have temperatures on the order of 2000 - 3000 K. As you might guess, the appearance of the spectrum of a star is very strongly dependent on its temperature. For instance the very hottest ...
The interstellar medium and star formation on kpc size scales
... But for those cases, the efficiency factor is multiplied by a factor of 10, which equates to the formation of ∼1 massive star (here, we set specifically that each star formation event corresponds to one massive star). In practice, this is equivalent to saying that only occasionally does an ∼100 M r ...
... But for those cases, the efficiency factor is multiplied by a factor of 10, which equates to the formation of ∼1 massive star (here, we set specifically that each star formation event corresponds to one massive star). In practice, this is equivalent to saying that only occasionally does an ∼100 M r ...
Slide 1
... Jets are thought to be charged particles following the twisted magnetic field lines of the black hole. It is also argued that these magnetic field lines could transport angular momentum (and account for the lost AM from accretion onto the central mass) ...
... Jets are thought to be charged particles following the twisted magnetic field lines of the black hole. It is also argued that these magnetic field lines could transport angular momentum (and account for the lost AM from accretion onto the central mass) ...
PoS(MQW6)077
... match perfectly, within the errors to our previous data. We take this as strong evidence that the absorption spectrum we observe does originate in the mass donor star. 6.2 Component Masses Using the Ko , Kx , and Porb values from above, along with the accepted system inclination of 78.8◦ , we arrive ...
... match perfectly, within the errors to our previous data. We take this as strong evidence that the absorption spectrum we observe does originate in the mass donor star. 6.2 Component Masses Using the Ko , Kx , and Porb values from above, along with the accepted system inclination of 78.8◦ , we arrive ...
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.