Stars PowerPoint
... and is made up primarily of hydrogen and helium. • Astronomers learn about conditions inside the Sun by a combination of observation and theoretical models. • The Sun’s atmosphere consists of the photosphere, the chromosphere, and the corona. • The Sun has a 22-year activity cycle caused by reversal ...
... and is made up primarily of hydrogen and helium. • Astronomers learn about conditions inside the Sun by a combination of observation and theoretical models. • The Sun’s atmosphere consists of the photosphere, the chromosphere, and the corona. • The Sun has a 22-year activity cycle caused by reversal ...
Stellar Evolution – Cosmic Cycles of Formation and Destruction
... the ingredients for planetary systems. Jets of hot gas are funneled from deep within these embryonic systems, and bursts of material are ejected from the young stellar objects at speeds of nearly a half-million kilometers per hour. The Herbig-Haro object HH111 shows the fast-moving jet of material f ...
... the ingredients for planetary systems. Jets of hot gas are funneled from deep within these embryonic systems, and bursts of material are ejected from the young stellar objects at speeds of nearly a half-million kilometers per hour. The Herbig-Haro object HH111 shows the fast-moving jet of material f ...
Standard Solar Model
... one to observe the overall change in composition throughout the star. This figure shows the decline in molecular weight with increasing radius. This decline is a product of the thermonuclear reactions that are powering the star. As mentioned above, during stellar evolution, hydrogen is converted int ...
... one to observe the overall change in composition throughout the star. This figure shows the decline in molecular weight with increasing radius. This decline is a product of the thermonuclear reactions that are powering the star. As mentioned above, during stellar evolution, hydrogen is converted int ...
GALEX UV Light-curves of M-Dwarf Flare Stars: THE FLARING UV
... • The magnetic field-lines of a star stretch up into their outer atmosphere - the corona - in loop-like structures • When adjacent magnetic field lines “re-connect” (probably due to disturbances within the stellar interior) they release energy in the form of electrons that gyrate down the field line ...
... • The magnetic field-lines of a star stretch up into their outer atmosphere - the corona - in loop-like structures • When adjacent magnetic field lines “re-connect” (probably due to disturbances within the stellar interior) they release energy in the form of electrons that gyrate down the field line ...
to view poster PDF - Max-Planck
... Fig.4 Top left: Three color Spitzer images (3.6 μm: blue, 8.0 μm: green , 24 μm: red) overlaid with MWISP C18O (1-0) integrated intensity contours (white). Blue circles, squares and diamonds stand for methanol masers, UCHII regions and MYSOs, respectively. The vertical scale bar represents 2’. Top r ...
... Fig.4 Top left: Three color Spitzer images (3.6 μm: blue, 8.0 μm: green , 24 μm: red) overlaid with MWISP C18O (1-0) integrated intensity contours (white). Blue circles, squares and diamonds stand for methanol masers, UCHII regions and MYSOs, respectively. The vertical scale bar represents 2’. Top r ...
Active Galactic Nuclei: are they important?
... •Active Galactic Nuclei are fantastic subject for somebody who likes to apply GR •They consist of a massive black hole surrounded by plentiful material flowing in and out •This material emits radiation so we can trace what is happening close to a black hole ...
... •Active Galactic Nuclei are fantastic subject for somebody who likes to apply GR •They consist of a massive black hole surrounded by plentiful material flowing in and out •This material emits radiation so we can trace what is happening close to a black hole ...
Paper (pdf)
... the neutron star rotation and magnetic field axes and constrain the mass to radius ratio. This project has been selected for technology development funding by the NASA Explorer Program. Keywords: Polarimetry, X-rays, Telescopes ...
... the neutron star rotation and magnetic field axes and constrain the mass to radius ratio. This project has been selected for technology development funding by the NASA Explorer Program. Keywords: Polarimetry, X-rays, Telescopes ...
E N 1”=140 AU
... ・The bubble = Shock created by collision between circumstellar material and jet from the primary?? ・Accretion from the circumstellar disk around the primary is very active（White & Ghez 2001). ・The primary is an EXor, which periodically undergo outbursts （Coffey et al. 2004）. ...
... ・The bubble = Shock created by collision between circumstellar material and jet from the primary?? ・Accretion from the circumstellar disk around the primary is very active（White & Ghez 2001). ・The primary is an EXor, which periodically undergo outbursts （Coffey et al. 2004）. ...
The flashy disappearance of a star falling behind the horizon of a
... horizon of a galactic black hole could also be a process, which would display the characteristic sharp decline of luminosity accompanied by a rapidly changing redshift. Such a process has been considered by Luminet et al. (Luminet and Barbuy 1990, Luminet and Carter 1986, Luminet and Marck 1985, Lum ...
... horizon of a galactic black hole could also be a process, which would display the characteristic sharp decline of luminosity accompanied by a rapidly changing redshift. Such a process has been considered by Luminet et al. (Luminet and Barbuy 1990, Luminet and Carter 1986, Luminet and Marck 1985, Lum ...
Nature template - PC Word 97
... in brightness. Such AGN contain compact jets of highly energetic, magnetized plasma that emanate from accreting supermassive black holes. According to theoretical models, such jets are launched by dynamic magnetic fields twisted by the differential rotation of the accretion disk or inertial-frame-dr ...
... in brightness. Such AGN contain compact jets of highly energetic, magnetized plasma that emanate from accreting supermassive black holes. According to theoretical models, such jets are launched by dynamic magnetic fields twisted by the differential rotation of the accretion disk or inertial-frame-dr ...
Recycling strange stars to millisecond periods
... most massive stars, when the deformation due to the rotation is relatively small because of the very strong gravitational pull. Such a cancellation is not so pronounced for ems , because there the relative magnitude of the j 2 correction is about twice that for lms (see Shibata & Sasaki 1998, Eqs. ( ...
... most massive stars, when the deformation due to the rotation is relatively small because of the very strong gravitational pull. Such a cancellation is not so pronounced for ems , because there the relative magnitude of the j 2 correction is about twice that for lms (see Shibata & Sasaki 1998, Eqs. ( ...
Sample
... center is indirectly supported by data of the existence of black holes in the centers of other galaxies. In fact, many astronomers believe that most (if not all) large galaxies have massive black holes at their centers. A recent census has identified over 30 black holes within the cores of nearby ga ...
... center is indirectly supported by data of the existence of black holes in the centers of other galaxies. In fact, many astronomers believe that most (if not all) large galaxies have massive black holes at their centers. A recent census has identified over 30 black holes within the cores of nearby ga ...
ATA2010
... is in stars, so the dynamical theory is mostly stellar dynamics Following this basic descriptive introduction, I will go straight to the lectures on the theoretical dynamics. This will give you maximum opportunity to complete the assignments. We will then return to more advanced descriptive material ...
... is in stars, so the dynamical theory is mostly stellar dynamics Following this basic descriptive introduction, I will go straight to the lectures on the theoretical dynamics. This will give you maximum opportunity to complete the assignments. We will then return to more advanced descriptive material ...
Long-term evolution of a dipolar-type magnetosphere interacting
... axis during the first periods, in agreement with the GWB97 results. However, this axial jet does not survive very long, if not an additional inflow of a stellar wind is prescribed. Hayashi et al. (1996) and GWB97 already demonstrated that a stellar magnetic dipole connected to a disk is deformed wit ...
... axis during the first periods, in agreement with the GWB97 results. However, this axial jet does not survive very long, if not an additional inflow of a stellar wind is prescribed. Hayashi et al. (1996) and GWB97 already demonstrated that a stellar magnetic dipole connected to a disk is deformed wit ...
Testing the black hole no-hair theorem using LIGO extreme mass
... • Robust source for LISA – most galaxies harbour a supermassive black hole in their centre which is surrounded by a cluster of stars. • Encounters between stars in the cluster can put COs onto orbits that pass close enough to the SMBH to be captured. Emission of GWs drives inspiral into the BH. ...
... • Robust source for LISA – most galaxies harbour a supermassive black hole in their centre which is surrounded by a cluster of stars. • Encounters between stars in the cluster can put COs onto orbits that pass close enough to the SMBH to be captured. Emission of GWs drives inspiral into the BH. ...
Transcript - Chandra X
... Slide 7: More detailed information about the H-R diagram will be presented further along. Since the presentation of the deep sky objects includes their spectral class and luminosity classes, the H-R diagram terminology is given here for those unfamiliar with H-R diagrams. The H-R diagram is a plot ...
... Slide 7: More detailed information about the H-R diagram will be presented further along. Since the presentation of the deep sky objects includes their spectral class and luminosity classes, the H-R diagram terminology is given here for those unfamiliar with H-R diagrams. The H-R diagram is a plot ...
The mass function of star clusters formed in turbulent molecular clouds
... Young (a few Myr old), massive (~104Msun), and compact (<1pc) in the MW ...
... Young (a few Myr old), massive (~104Msun), and compact (<1pc) in the MW ...
Solutions to Homework #4, AST 203, Spring 2012
... rotation of the neutron star will be much shorter, as we expect. Substituting numbers, RNS /RCO = 10km/(0.5R ) ≈ 2×10−5 . The period is then PNS = (2×10−5 )2 ×30days ≈ 1 millisecond. This number is actually near the limit of how fast a neutron star can rotate. From observations of radio pulsars we ...
... rotation of the neutron star will be much shorter, as we expect. Substituting numbers, RNS /RCO = 10km/(0.5R ) ≈ 2×10−5 . The period is then PNS = (2×10−5 )2 ×30days ≈ 1 millisecond. This number is actually near the limit of how fast a neutron star can rotate. From observations of radio pulsars we ...
Fast-Moving Structures in the Debris Disk Around AU Microscopii
... side at a projected separation of ∼13 au 10 . We re-analyzed these data to yield separate images for the 2010 and 2011 epochs. Both show that this bump is equivalent with feature B seen in the 2014 SPHERE image but situated ∼4 au closer to the star (Fig. 1). In fact, the HST re-processed images cont ...
... side at a projected separation of ∼13 au 10 . We re-analyzed these data to yield separate images for the 2010 and 2011 epochs. Both show that this bump is equivalent with feature B seen in the 2014 SPHERE image but situated ∼4 au closer to the star (Fig. 1). In fact, the HST re-processed images cont ...
SGR and AXP – are they magnetars?
... SGR0418+5729, recently detected after it emitted bursts similar to those of magnetars. X-ray observations show that its dipolar magnetic field cannot be greater than 7.5 10^12 Gauss, well in the range of ordinary radio pulsars, implying that a high surface dipolar magnetic field is not necessarily r ...
... SGR0418+5729, recently detected after it emitted bursts similar to those of magnetars. X-ray observations show that its dipolar magnetic field cannot be greater than 7.5 10^12 Gauss, well in the range of ordinary radio pulsars, implying that a high surface dipolar magnetic field is not necessarily r ...
Cygnus X-1
Cygnus X-1 (abbreviated Cyg X-1) is a well-known galactic X-ray source, thought to be a black hole, in the constellation Cygnus. It was discovered in 1964 during a rocket flight and is one of the strongest X-ray sources seen from Earth, producing a peak X-ray flux density of 6977229999999999999♠2.3×10−23 Wm−2 Hz−1 (7003230000000000000♠2.3×103 Jansky). Cygnus X-1 was the first X-ray source widely accepted to be a black hole and it remains among the most studied astronomical objects in its class. The compact object is now estimated to have a mass about 14.8 times the mass of the Sun and has been shown to be too small to be any known kind of normal star, or other likely object besides a black hole. If so, the radius of its event horizon is about 7004440000000000000♠44 km.Cygnus X-1 belongs to a high-mass X-ray binary system about 7019574266339685654♠6070 ly from the Sun that includes a blue supergiant variable star designated HDE 226868 which it orbits at about 0.2 AU, or 20% of the distance from the Earth to the Sun. A stellar wind from the star provides material for an accretion disk around the X-ray source. Matter in the inner disk is heated to millions of degrees, generating the observed X-rays. A pair of jets, arranged perpendicular to the disk, are carrying part of the energy of the infalling material away into interstellar space.This system may belong to a stellar association called Cygnus OB3, which would mean that Cygnus X-1 is about five million years old and formed from a progenitor star that had more than 7001400000000000000♠40 solar masses. The majority of the star's mass was shed, most likely as a stellar wind. If this star had then exploded as a supernova, the resulting force would most likely have ejected the remnant from the system. Hence the star may have instead collapsed directly into a black hole.Cygnus X-1 was the subject of a friendly scientific wager between physicists Stephen Hawking and Kip Thorne in 1975, with Hawking betting that it was not a black hole. He conceded the bet in 1990 after observational data had strengthened the case that there was indeed a black hole in the system. This hypothesis has not been confirmed due to a lack of direct observation but has generally been accepted from indirect evidence.