What Are the Faint X-ray Transients Near the Galactic Center?
... • Most bright, transient X-ray sources are accreting black holes and neutron stars. • When accretion occurs at low rates, the disk tends to be unstable, producing outbursts with LX>1037 erg s-1. ...
... • Most bright, transient X-ray sources are accreting black holes and neutron stars. • When accretion occurs at low rates, the disk tends to be unstable, producing outbursts with LX>1037 erg s-1. ...
How far away are the Stars?
... Technical Difficulties in Triangulation • For a fixed baseline, angle 90 as object gets further away. • Hence error in distance value increases. • How big a baseline can you get? Diameter of Earth : 13,000km Size of Earth’s orbit : 300,000,000km ...
... Technical Difficulties in Triangulation • For a fixed baseline, angle 90 as object gets further away. • Hence error in distance value increases. • How big a baseline can you get? Diameter of Earth : 13,000km Size of Earth’s orbit : 300,000,000km ...
poster
... axis have different scales in those plots) in the CMD. The length of each line marks its class. The black arrow indicates the ISM reddening slope. Non-member sources and most members cluster around this slope in the CMD, indicating that their color changes are caused by variable extinction. In contr ...
... axis have different scales in those plots) in the CMD. The length of each line marks its class. The black arrow indicates the ISM reddening slope. Non-member sources and most members cluster around this slope in the CMD, indicating that their color changes are caused by variable extinction. In contr ...
Astronomy Astrophysics + Infrared identification of 2XMM J191043.4
... the H-band spectrum prevented us from identifying hydrogen lines such as Br10, Br11, or Br12, and/or helium lines like He ii 1.6918 μm or He i 1.7002 μm clearly. Other hydrogen lines are not detected, probably because their intensities would be below the continuum noise level. On the other hand, coo ...
... the H-band spectrum prevented us from identifying hydrogen lines such as Br10, Br11, or Br12, and/or helium lines like He ii 1.6918 μm or He i 1.7002 μm clearly. Other hydrogen lines are not detected, probably because their intensities would be below the continuum noise level. On the other hand, coo ...
J: Chapter 4: Stars and Galaxies
... How do scientists determine distance to stars from the solar system that Earth is part of? One way is to measure its parallax—the apparent shift in the position of an object when viewed from two different positions. Extend your arm and look at your thumb first with your left eye closed and then with ...
... How do scientists determine distance to stars from the solar system that Earth is part of? One way is to measure its parallax—the apparent shift in the position of an object when viewed from two different positions. Extend your arm and look at your thumb first with your left eye closed and then with ...
Goal: To understand what comets are and to explore the Oort cloud.
... • Long period comets (comets with periods of millions of years) come from the Oort cloud. • Oort cloud objects probably formed in the gas giant region and were probably tossed there by Jupiter. • They are usually a bit bigger than short period comets, and higher densities. • A bright one comes into ...
... • Long period comets (comets with periods of millions of years) come from the Oort cloud. • Oort cloud objects probably formed in the gas giant region and were probably tossed there by Jupiter. • They are usually a bit bigger than short period comets, and higher densities. • A bright one comes into ...
Document
... This is a transcendental equation in Pe that has to be solved iteratively. F(T) are constants for such an iteration. Pe and Pg are functions of t0. This equation is solved at each depth using the first guess of Pg(t0). ...
... This is a transcendental equation in Pe that has to be solved iteratively. F(T) are constants for such an iteration. Pe and Pg are functions of t0. This equation is solved at each depth using the first guess of Pg(t0). ...
Life of a Star - Amazon Web Services
... stable and should continue to be for another 5 billion years. Old age for the Sun will be more spectacular than middle age. It is expected to expand, becoming a red Giant, perhaps twice during its later years.These showy final years will lead to a much quieter death. The Sun will shed its outer laye ...
... stable and should continue to be for another 5 billion years. Old age for the Sun will be more spectacular than middle age. It is expected to expand, becoming a red Giant, perhaps twice during its later years.These showy final years will lead to a much quieter death. The Sun will shed its outer laye ...
The Big Bang Is Bunk - 21stcenturysciencetech.com
... the ionosphere and was of unprecedented strength. All this was very encouraging. Accordingly, I decided to set up properly with an antenna system that could be called a hectometer radio telescope, for observations at a wave length of 100 meters. During 1961 and 1962, I constructed an elaborate arra ...
... the ionosphere and was of unprecedented strength. All this was very encouraging. Accordingly, I decided to set up properly with an antenna system that could be called a hectometer radio telescope, for observations at a wave length of 100 meters. During 1961 and 1962, I constructed an elaborate arra ...
Planet formation around stars of various masses: The snow line and
... MMSN disk around a solar-mass star. There are several motivating factors for extending these theories to a range of stellar masses: (i) the increasing stellar mass range of extra-solar planet hosts, (ii) observed trends with stellar mass, such as accretion rate and disk mass, and (iii) theoretical r ...
... MMSN disk around a solar-mass star. There are several motivating factors for extending these theories to a range of stellar masses: (i) the increasing stellar mass range of extra-solar planet hosts, (ii) observed trends with stellar mass, such as accretion rate and disk mass, and (iii) theoretical r ...
1 Pau Amaro Seoane - modest 15-s
... We present an expression of the external gravitational field of a general ring-like object with the axial and plane symmetries such as annular disks or oval toroids with an arbitrary density distribution. The main term is that of an infinitely thin ring (Fukushima, 2010, Celest. Mech. Dyn. Astron., ...
... We present an expression of the external gravitational field of a general ring-like object with the axial and plane symmetries such as annular disks or oval toroids with an arbitrary density distribution. The main term is that of an infinitely thin ring (Fukushima, 2010, Celest. Mech. Dyn. Astron., ...
The AcroCoRoT objectives (10 min) - IAG-Usp
... AcRoCorot objectives : be ready when data come to use them efficiently hence organisation of meetings such as the present one to motivate - teams with similar interest to continue to meet and talk (collaboration, exchange of brain thinkings and tools) ...
... AcRoCorot objectives : be ready when data come to use them efficiently hence organisation of meetings such as the present one to motivate - teams with similar interest to continue to meet and talk (collaboration, exchange of brain thinkings and tools) ...
20agn1s
... AGN black holes are a million to a billion times the mass of the Sun Why do we think they have black holes? ...
... AGN black holes are a million to a billion times the mass of the Sun Why do we think they have black holes? ...
File - Mr. Pelton Science
... • Galaxy clusters larger than the Local Group may have hundreds or thousands of members with diameters up to 30 million ly across. • Galaxies close together often collide to form strangely shaped galaxies or galaxies with more than one nucleus (Andromeda) ...
... • Galaxy clusters larger than the Local Group may have hundreds or thousands of members with diameters up to 30 million ly across. • Galaxies close together often collide to form strangely shaped galaxies or galaxies with more than one nucleus (Andromeda) ...
Formation of cold gas filaments from colliding superbubbles
... and low temperatures (T < 300 K). In particular, we want to explore the mechanisms that can lead to the filamentary structure typical of these clouds. A natural mechanism for the formation of large amounts of cold gas in a small region are converging flows. This type of problem has been studied exte ...
... and low temperatures (T < 300 K). In particular, we want to explore the mechanisms that can lead to the filamentary structure typical of these clouds. A natural mechanism for the formation of large amounts of cold gas in a small region are converging flows. This type of problem has been studied exte ...
What is a standard candle?
... Both stars have the same average apparent brightness. The star in galaxy A has a bright-dim-bright period of 10 days, while the one in galaxy B has a bright-dim-bright period of 30 days. Which of the two galaxies is at a greater distance from us? a) ...
... Both stars have the same average apparent brightness. The star in galaxy A has a bright-dim-bright period of 10 days, while the one in galaxy B has a bright-dim-bright period of 30 days. Which of the two galaxies is at a greater distance from us? a) ...
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.