A Star - Cloudy Nights
... A few stars in the sky are actually multiple star systems, which can have anywhere from three to ten stars orbiting around a common point. Most of the time, there will be two or three brighter stars, with the rest being extremely faint or extremely close to each other. Almaak, or Gamma Andromeda i ...
... A few stars in the sky are actually multiple star systems, which can have anywhere from three to ten stars orbiting around a common point. Most of the time, there will be two or three brighter stars, with the rest being extremely faint or extremely close to each other. Almaak, or Gamma Andromeda i ...
Conference Abstract Booklet here.
... and OGLE team Blazhko effect is a long-term quasi-periodic amplitude and/or phase modulation of pulsations of RR Lyrae stars. After its discovery in 1907 by Sergey Blazhko, its origin remains a mystery. This phenomenon has not been extensively studied in firstovertone (RRc) RR Lyrae stars yet. The O ...
... and OGLE team Blazhko effect is a long-term quasi-periodic amplitude and/or phase modulation of pulsations of RR Lyrae stars. After its discovery in 1907 by Sergey Blazhko, its origin remains a mystery. This phenomenon has not been extensively studied in firstovertone (RRc) RR Lyrae stars yet. The O ...
Stellar evolution - Statistical Physics Group
... hydrogen to helium supplies the star’s energy loss, is well understood and postmain-sequence evolution has been followed to the phase of helium burning or carbon burning at the centre of the star. I t is clear that it will only be a matter of time before these calculations are carried to a later sta ...
... hydrogen to helium supplies the star’s energy loss, is well understood and postmain-sequence evolution has been followed to the phase of helium burning or carbon burning at the centre of the star. I t is clear that it will only be a matter of time before these calculations are carried to a later sta ...
Ages of Young Stars
... (l) Cargile and James (2010), (m) Naylor et al. (2009), (n) derived by E. Mamajek using data from Hauck and Mermilliod (1998) and isochrones from Bertelli et al. (2009), (o) Ventura et al. (1998). ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke ...
... (l) Cargile and James (2010), (m) Naylor et al. (2009), (n) derived by E. Mamajek using data from Hauck and Mermilliod (1998) and isochrones from Bertelli et al. (2009), (o) Ventura et al. (1998). ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke ...
Ages of young stars
... (l) Cargile and James (2010), (m) Naylor et al. (2009), (n) derived by E. Mamajek using data from Hauck and Mermilliod (1998) and isochrones from Bertelli et al. (2009), (o) Ventura et al. (1998). ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke ...
... (l) Cargile and James (2010), (m) Naylor et al. (2009), (n) derived by E. Mamajek using data from Hauck and Mermilliod (1998) and isochrones from Bertelli et al. (2009), (o) Ventura et al. (1998). ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke ...
The evolution of the Sun`s birth cluster and the search for the solar
... cluster in the Milky Way potential to investigate the present-day phase space distribution of the sun’s siblings. The simulations include the gravitational N -body forces within the cluster and the effects of stellar evolution on the cluster population. In addition the gravitational forces due to th ...
... cluster in the Milky Way potential to investigate the present-day phase space distribution of the sun’s siblings. The simulations include the gravitational N -body forces within the cluster and the effects of stellar evolution on the cluster population. In addition the gravitational forces due to th ...
Astronomical Picture of the Day
... galaxies Abell 1185. There at least two galaxies, cataloged as Arp 105 and dubbed The Guitar for their familiar appearance, are pulling each other apart gravitationally. Most of Abell 1185's hundreds of galaxies are elliptical galaxies, although spiral, lenticular, and irregular galaxies are all cle ...
... galaxies Abell 1185. There at least two galaxies, cataloged as Arp 105 and dubbed The Guitar for their familiar appearance, are pulling each other apart gravitationally. Most of Abell 1185's hundreds of galaxies are elliptical galaxies, although spiral, lenticular, and irregular galaxies are all cle ...
Orion the Hunter
... vicinity of Orion’s belt, M42 is 1,500 lightyears away and just a small enhancement in a giant molecular cloud. Embedded in the nebulosity is the Orion Nebula Cluster, a gathering of more than 4,000 stars with an average age of only one million years. Because it’s the closest region of active star f ...
... vicinity of Orion’s belt, M42 is 1,500 lightyears away and just a small enhancement in a giant molecular cloud. Embedded in the nebulosity is the Orion Nebula Cluster, a gathering of more than 4,000 stars with an average age of only one million years. Because it’s the closest region of active star f ...
Astronomy Astrophysics
... The procedure employed for determining the fundamental cluster parameters such as age, reddening, and distance is described in Borissova et al. (2011) and Chené et al. (2012, 2013). As described in Borissova et al. (2011), we used the field-star decontamination algorithm of Bonatto & Bica (2010), wh ...
... The procedure employed for determining the fundamental cluster parameters such as age, reddening, and distance is described in Borissova et al. (2011) and Chené et al. (2012, 2013). As described in Borissova et al. (2011), we used the field-star decontamination algorithm of Bonatto & Bica (2010), wh ...
Is there a Supermassive Black Hole at the Center of the Milky Way?
... radio galaxies are incredibly small, even smaller than the distance between the Sun and the nearest star5 . Simple calculations of the minimum energy needed to power giant radio lobes require the total conversion of up to 107 stars into energy6 ! Since nuclear reactions convert less than 1% of mass ...
... radio galaxies are incredibly small, even smaller than the distance between the Sun and the nearest star5 . Simple calculations of the minimum energy needed to power giant radio lobes require the total conversion of up to 107 stars into energy6 ! Since nuclear reactions convert less than 1% of mass ...
Galaxies - WordPress.com
... A galaxies occasionally collide with one another, particularly within cluster of galaxies B galaxies are so closely packed in the universe that they are always interacting with one another C galaxies are so widely separated that they never interact or collide D the universe is composed of one giant ...
... A galaxies occasionally collide with one another, particularly within cluster of galaxies B galaxies are so closely packed in the universe that they are always interacting with one another C galaxies are so widely separated that they never interact or collide D the universe is composed of one giant ...
NGC 6231: a young open cluster under X-rays
... • There is no spatial trends between the cTTs and the wTTs • There is no very significant difference in their ages • Star formation in NGC 6231 was most probably not a punctual event • Formation scenario is compatible with the coalescence model for massive star formation 20-Dec-2006 ...
... • There is no spatial trends between the cTTs and the wTTs • There is no very significant difference in their ages • Star formation in NGC 6231 was most probably not a punctual event • Formation scenario is compatible with the coalescence model for massive star formation 20-Dec-2006 ...
Stars, Galaxies, Superuniverses and the Urantia Book, by Frederick
... Given this number of galaxies and the total number of stars in the master universe, one can calculate that the average number of stars per galaxy is 4.4 x 1021 stars divided by 1.0 x 1011 galaxies or 4.4 x 1010 stars per galaxy (44 billion). The number of stars in our Milky Way galaxy is estimated t ...
... Given this number of galaxies and the total number of stars in the master universe, one can calculate that the average number of stars per galaxy is 4.4 x 1021 stars divided by 1.0 x 1011 galaxies or 4.4 x 1010 stars per galaxy (44 billion). The number of stars in our Milky Way galaxy is estimated t ...
The Milky Way as a galaxy
... vector of the star cluster. In other words, the direction vector of the stars is such that they are all moving towards the convergence point. Thus, nconv (and hence v=jvj) can be measured from the direction of the proper motions of the stars in the cluster. On the other hand, one component of v can ...
... vector of the star cluster. In other words, the direction vector of the stars is such that they are all moving towards the convergence point. Thus, nconv (and hence v=jvj) can be measured from the direction of the proper motions of the stars in the cluster. On the other hand, one component of v can ...
Science with IMACS on Magellan
... Fluctuation technique developed by John Tonry. Some early results using a single Tektronix 2048 × 204824µm pixel CCD have shown that the Baade telescope can extend these measurements, which typically produce distance measurements that are accurate to 5%, to galaxies with V ∼ 5000 km s−1 or beyond. T ...
... Fluctuation technique developed by John Tonry. Some early results using a single Tektronix 2048 × 204824µm pixel CCD have shown that the Baade telescope can extend these measurements, which typically produce distance measurements that are accurate to 5%, to galaxies with V ∼ 5000 km s−1 or beyond. T ...
Star formation rates from young-star counts and the structure of the
... sky. Our catalogue of young stars in NGC 346, one of the largest star-forming complexes in the SMC, is among the richest Magellanic Clouds stellar ensembles ever collected with HST. Three pointings (with significant offsets), centred on NGC 346, were observed with the Wide-Field Channel of ACS cover ...
... sky. Our catalogue of young stars in NGC 346, one of the largest star-forming complexes in the SMC, is among the richest Magellanic Clouds stellar ensembles ever collected with HST. Three pointings (with significant offsets), centred on NGC 346, were observed with the Wide-Field Channel of ACS cover ...
Cloud Formation, Evolution and Destruction
... For example, the turbulent motions could cycle the material between the interior and the surface where the exposure to ultraviolet radiation could rejuvenate the chemical state. How do we reconcile the rapid cloud evolution with the relatively low rate of star formation, 3 M yr−1 , in our Galaxy? G ...
... For example, the turbulent motions could cycle the material between the interior and the surface where the exposure to ultraviolet radiation could rejuvenate the chemical state. How do we reconcile the rapid cloud evolution with the relatively low rate of star formation, 3 M yr−1 , in our Galaxy? G ...
to - NexStar Resource Site
... 4) Saturn An object in our very own neighborhood in the constellation.......pick one. :-). Although Galileo was the first to observe it with a telescope in 1610, Saturn has been known since prehistoric times. Up to 1977 Saturn was believed to be the only planet with a ring system. It was later disc ...
... 4) Saturn An object in our very own neighborhood in the constellation.......pick one. :-). Although Galileo was the first to observe it with a telescope in 1610, Saturn has been known since prehistoric times. Up to 1977 Saturn was believed to be the only planet with a ring system. It was later disc ...
Sec 30.1 - Highland High School
... What method did astronomers use to determine the shape of the Milky Way galaxy? a. measuring X-ray emissions b. observing Cepheid variables c. mapping the galaxy with radio waves d. sending out long-range space probes ...
... What method did astronomers use to determine the shape of the Milky Way galaxy? a. measuring X-ray emissions b. observing Cepheid variables c. mapping the galaxy with radio waves d. sending out long-range space probes ...
PDF - ASSA
... 7500 light years from the Sun, is one of our Galaxy’s most spectacular sights. It is embedded within the much larger Carina complex and is an active starforming region, home to more than 70 O-type stars. In comparison, the Orion Nebula region has only 10 of these rare, hot luminous blue-white power- ...
... 7500 light years from the Sun, is one of our Galaxy’s most spectacular sights. It is embedded within the much larger Carina complex and is an active starforming region, home to more than 70 O-type stars. In comparison, the Orion Nebula region has only 10 of these rare, hot luminous blue-white power- ...
THE N/O RATIO IN EARLY B-TYPE MAIN SEQUENCE STARS AS
... parameters of 107 of the stars in this list were subsequently determined [9], including the effective temperature Teff, acceleration logg of gravity in the atmosphere, radius R, luminosity L, and age t, as well as the relative age t/tMS, where tMS is the lifetime of a star with this mass M in the ma ...
... parameters of 107 of the stars in this list were subsequently determined [9], including the effective temperature Teff, acceleration logg of gravity in the atmosphere, radius R, luminosity L, and age t, as well as the relative age t/tMS, where tMS is the lifetime of a star with this mass M in the ma ...
Confirmation of Hostless Type Ia Supernovae Using Hubble Space
... SNe Ia still have no possible host galaxy associated with them (MR > −9.2), confirming that their progenitors belong to the intracluster stellar population. The third SNe Ia appears near a faint disk galaxy (MV = −12.2) which has a relatively high probability of being a chance alignment. A faint, re ...
... SNe Ia still have no possible host galaxy associated with them (MR > −9.2), confirming that their progenitors belong to the intracluster stellar population. The third SNe Ia appears near a faint disk galaxy (MV = −12.2) which has a relatively high probability of being a chance alignment. A faint, re ...
Comparing stars - The Open University
... than the Sun, and appears bluish-white. It has the greatest apparent visual brightness (most negative apparent visual magnitude!) of any star in the night sky. This is, as we have seen, not because it is very luminous, but because it is both fairly luminous and rather close - at 2.63 pc it's the sev ...
... than the Sun, and appears bluish-white. It has the greatest apparent visual brightness (most negative apparent visual magnitude!) of any star in the night sky. This is, as we have seen, not because it is very luminous, but because it is both fairly luminous and rather close - at 2.63 pc it's the sev ...
Open cluster
An open cluster, also known as galactic cluster, is a group of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age. More than 1,100 open clusters have been discovered within the Milky Way Galaxy, and many more are thought to exist. They are loosely bound by mutual gravitational attraction and become disrupted by close encounters with other clusters and clouds of gas as they orbit the galactic center, resulting in a migration to the main body of the galaxy as well as a loss of cluster members through internal close encounters. Open clusters generally survive for a few hundred million years, with the most massive ones surviving for a few billion years. In contrast, the more massive globular clusters of stars exert a stronger gravitational attraction on their members, and can survive for longer. Open clusters have been found only in spiral and irregular galaxies, in which active star formation is occurring.Young open clusters may still be contained within the molecular cloud from which they formed, illuminating it to create an H II region. Over time, radiation pressure from the cluster will disperse the molecular cloud. Typically, about 10% of the mass of a gas cloud will coalesce into stars before radiation pressure drives the rest of the gas away.Open clusters are key objects in the study of stellar evolution. Because the cluster members are of similar age and chemical composition, their properties (such as distance, age, metallicity and extinction) are more easily determined than they are for isolated stars. A number of open clusters, such as the Pleiades, Hyades or the Alpha Persei Cluster are visible with the naked eye. Some others, such as the Double Cluster, are barely perceptible without instruments, while many more can be seen using binoculars or telescopes. The Wild Duck Cluster, M11, is an example.