Star Formation in the Rosette Complex
... Region. This region comprises the Mon OB1 Cloud (host of NGC 2264 and the Cone Nebula), the Monoceros Loop (NGC 2252), and the Mon OB2 Cloud in which the Rosette is one of the most prominent features (see Figure 2). The catalog name for the Rosette can be somewhat confusing because it is not unique: ...
... Region. This region comprises the Mon OB1 Cloud (host of NGC 2264 and the Cone Nebula), the Monoceros Loop (NGC 2252), and the Mon OB2 Cloud in which the Rosette is one of the most prominent features (see Figure 2). The catalog name for the Rosette can be somewhat confusing because it is not unique: ...
astro-ph/0504597 PDF
... a whole) is to test its theoretical models against observations. Today, all most all the cosmological observations come from cosmic microwave background and supernovae. Supernovae are the tools at hand(!) for measuring the universe, that is, its mass density, its large scale curvature and its fate. ...
... a whole) is to test its theoretical models against observations. Today, all most all the cosmological observations come from cosmic microwave background and supernovae. Supernovae are the tools at hand(!) for measuring the universe, that is, its mass density, its large scale curvature and its fate. ...
The Little Star That Could - Challenger Learning Center
... (From the Merriam-Webster Dictionary) Average – (adjective) being about midway between extremes, not out of the ordinary: Common Planet – any of the large bodies that revolve around the sun in the solar system Star – a: a natural luminous body visible in the sky especially at night b: a self-luminou ...
... (From the Merriam-Webster Dictionary) Average – (adjective) being about midway between extremes, not out of the ordinary: Common Planet – any of the large bodies that revolve around the sun in the solar system Star – a: a natural luminous body visible in the sky especially at night b: a self-luminou ...
Spectral classification of O–M stars on the basis of UBV photometry
... In the process of spectral classification, about 60% of analyzed stars have been assigned to a single or two rather close estimates of spectra. In the last case an average value was adopted. Another 40% of stars have obtained two substantially different estimates of spectra. Double results of the cl ...
... In the process of spectral classification, about 60% of analyzed stars have been assigned to a single or two rather close estimates of spectra. In the last case an average value was adopted. Another 40% of stars have obtained two substantially different estimates of spectra. Double results of the cl ...
Observations of binary systems with pulsating components
... • A large fraction of stars in the Universe is in binary or multiple systems. This presentation focuses on binary systems only. ...
... • A large fraction of stars in the Universe is in binary or multiple systems. This presentation focuses on binary systems only. ...
Physics of Star Formation: Milky Way and Beyond
... Virial equilibrium, implying in the collective imagination of astronomers that turbulence provides support to molecular clouds against collapse. Moreover, the origin of MC turbulence is still not properly understood, since it appears to be homogeneous and ubiquitous along the galaxy, while the sourc ...
... Virial equilibrium, implying in the collective imagination of astronomers that turbulence provides support to molecular clouds against collapse. Moreover, the origin of MC turbulence is still not properly understood, since it appears to be homogeneous and ubiquitous along the galaxy, while the sourc ...
The Halo of the Milky Way
... space velocities for a representative set of stars in every substructure. Tangential velocities for many stars will be provided by current and planned astrometry missions, but no planned mission will measure stars faint enough to unravel the more distant parts of the spheroid, which contain the majo ...
... space velocities for a representative set of stars in every substructure. Tangential velocities for many stars will be provided by current and planned astrometry missions, but no planned mission will measure stars faint enough to unravel the more distant parts of the spheroid, which contain the majo ...
Spectral Classification: The First Step in Quantitative Spectral Analysis
... These stars have a WD companion, and were contaminated with s-process elements and carbon when that WD was an AGB star. Is HD 26367 a binary star? Yes, both Hipparcos and radial velocity measurements indicate the presence of an unseen companion with mass ~ 0.6M ...
... These stars have a WD companion, and were contaminated with s-process elements and carbon when that WD was an AGB star. Is HD 26367 a binary star? Yes, both Hipparcos and radial velocity measurements indicate the presence of an unseen companion with mass ~ 0.6M ...
Chapter 16--Properties of Stars
... century, humans classified stars primarily by their brightness and location in our sky. The names of the brightest stars within each constellation still bear Greek letters designating their order of brightness. For example, the brightest star in the constellation Centaurus is Alpha Centauri, the sec ...
... century, humans classified stars primarily by their brightness and location in our sky. The names of the brightest stars within each constellation still bear Greek letters designating their order of brightness. For example, the brightest star in the constellation Centaurus is Alpha Centauri, the sec ...
Altair - the hottest `cool` star in X-rays
... at temperatures in the range of 1 – 4 MK, additionally a weak hotter component seems to contribute at a few percent level. These properties are quite typical for weakly active stars and similar to those of the quiescent Sun. This suggests that large active regions or significant flaring components a ...
... at temperatures in the range of 1 – 4 MK, additionally a weak hotter component seems to contribute at a few percent level. These properties are quite typical for weakly active stars and similar to those of the quiescent Sun. This suggests that large active regions or significant flaring components a ...
A spectroscopic investigation of the O
... Results. We confirm the binarity for four objects: HD 193443, HD 228989, HD 229234, and HD 194649. We derive for the first time the orbital solutions of three systems, and we confirm the values of the fourth, showing that these four systems all have orbital periods shorter than 10 days. Besides thes ...
... Results. We confirm the binarity for four objects: HD 193443, HD 228989, HD 229234, and HD 194649. We derive for the first time the orbital solutions of three systems, and we confirm the values of the fourth, showing that these four systems all have orbital periods shorter than 10 days. Besides thes ...
Galaxy / Cluster Ecosystem Ming Sun (University of Alabama in Huntsville)
... time ~ 10 Myr) embedded in the 6.7 keV ICM. A sharp edge 0.8 kpc south of the nucleus. Galaxy’svelocity vs.Perseus’s: + 2170 km/s --Mach number of ~ 3 --- a Bullet galaxy ! Soft X-ray Radio Optical Sun, Jerius & Jones 2005 ...
... time ~ 10 Myr) embedded in the 6.7 keV ICM. A sharp edge 0.8 kpc south of the nucleus. Galaxy’svelocity vs.Perseus’s: + 2170 km/s --Mach number of ~ 3 --- a Bullet galaxy ! Soft X-ray Radio Optical Sun, Jerius & Jones 2005 ...
What Can You See With a Telescope
... No asteroids were found until 1845—almost forty years later—even though groups of amateur and professional astronomers designed special sky-mapping projects to search for them. ...
... No asteroids were found until 1845—almost forty years later—even though groups of amateur and professional astronomers designed special sky-mapping projects to search for them. ...
Cygnus (constellation)
Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.