The extragalactic universe and distance measurements
... – Extended Messier’s list of nebula – Tried to determine distribution of stars in Milky Way – described Milky Way as “detached nebula”, with Sun near center. – Thought that the nebulae could be similar systems – Turns out that his conclusions were heavily effected by dust in the Milky Way – Milky Wa ...
... – Extended Messier’s list of nebula – Tried to determine distribution of stars in Milky Way – described Milky Way as “detached nebula”, with Sun near center. – Thought that the nebulae could be similar systems – Turns out that his conclusions were heavily effected by dust in the Milky Way – Milky Wa ...
18 are exactly the same ones as for galactic star clusters of early
... stars probably belong to the field, but one may ask whether some correspond to a very much older generation of stars. This observation seems to support Herbig's (1962) proposal of a spread in ages within one cluster. It is planned to extend work on NGC 6067 and also to study a neighbouring field in ...
... stars probably belong to the field, but one may ask whether some correspond to a very much older generation of stars. This observation seems to support Herbig's (1962) proposal of a spread in ages within one cluster. It is planned to extend work on NGC 6067 and also to study a neighbouring field in ...
Ch. 19 (Starbirth)
... Other triggers: • Death of a nearby Sunlike star • Supernova • Density waves in galactic spiral arms ...
... Other triggers: • Death of a nearby Sunlike star • Supernova • Density waves in galactic spiral arms ...
Good Vibrations and Stellar Pulsations - Physics
... • Shapley mistook the Pop II Cepheids in globular clusters for Pop I Cepheids, so his Pop II Cepheids in the globular clusters were properly calibrated (luck!). • Shapley’s distances to the globular clusters were correct. • Hubble’s Pop I Cepheids in M31 were underluminous by a factor of 4, so M31(a ...
... • Shapley mistook the Pop II Cepheids in globular clusters for Pop I Cepheids, so his Pop II Cepheids in the globular clusters were properly calibrated (luck!). • Shapley’s distances to the globular clusters were correct. • Hubble’s Pop I Cepheids in M31 were underluminous by a factor of 4, so M31(a ...
astrocoursespring2012lec5-1-1
... Leo Triplet: Messier 66 is part of a really delightful trio of galaxies, of which M65 and NGC 3628 are the other members. While M65 is almost edge-on in appearance, M66 is angles so that we see more of its face, including one spiral arm that hangs more limply tha the other, as if the galaxy had suff ...
... Leo Triplet: Messier 66 is part of a really delightful trio of galaxies, of which M65 and NGC 3628 are the other members. While M65 is almost edge-on in appearance, M66 is angles so that we see more of its face, including one spiral arm that hangs more limply tha the other, as if the galaxy had suff ...
SIERRA STAR GAZERS
... apparent size, use the lowest magnification you have available for the best view of this fascinating object. OIII and Deep Sky filters work well on the Lagoon. Messier 20 is another bright cluster/nebula combination, and is very near to M8 in the sky. In fact it is somewhat nearer to us, at a distan ...
... apparent size, use the lowest magnification you have available for the best view of this fascinating object. OIII and Deep Sky filters work well on the Lagoon. Messier 20 is another bright cluster/nebula combination, and is very near to M8 in the sky. In fact it is somewhat nearer to us, at a distan ...
Test #4
... c) The shape of the spiral arms, d) Infrared observations of the center of the Galaxy 4. Which of the following is not found in the Galaxy’s spiral arms? a) young star clusters, b) O and B stars, c) globular clusters, d) emission nebulae 5. The object located at the center of the Galaxy is believed ...
... c) The shape of the spiral arms, d) Infrared observations of the center of the Galaxy 4. Which of the following is not found in the Galaxy’s spiral arms? a) young star clusters, b) O and B stars, c) globular clusters, d) emission nebulae 5. The object located at the center of the Galaxy is believed ...
Night Sky Course Stars and Star Clusters within the
... We find the age of the cluster by noting which stars have had the time to evolve into red giants. Such calculations, according to the model for stellar evolution are at least as old as the galaxy itself. Stars in this collection belong to a population of stars whose chemical composition consists mos ...
... We find the age of the cluster by noting which stars have had the time to evolve into red giants. Such calculations, according to the model for stellar evolution are at least as old as the galaxy itself. Stars in this collection belong to a population of stars whose chemical composition consists mos ...
Chapter 14 The Milky Way Galaxy
... This allows us to measure the distances to these stars. • RR Lyrae stars all have about the same luminosity; knowing their apparent magnitude allows us to calculate the distance. • Cepheids have a luminosity that is strongly correlated with the period of their oscillations; once the period is measur ...
... This allows us to measure the distances to these stars. • RR Lyrae stars all have about the same luminosity; knowing their apparent magnitude allows us to calculate the distance. • Cepheids have a luminosity that is strongly correlated with the period of their oscillations; once the period is measur ...
May
... NGC4656 is a type SBm barred spiral galaxy in the constellation Canes Venatici (KAY-neez- vë-NAT-ih-si). Popularly known as the Hockey Stick Galaxy, the key features are the angled tilt of the disk and the apparent offset of the core. If observing at low magnification look in the same field of view ...
... NGC4656 is a type SBm barred spiral galaxy in the constellation Canes Venatici (KAY-neez- vë-NAT-ih-si). Popularly known as the Hockey Stick Galaxy, the key features are the angled tilt of the disk and the apparent offset of the core. If observing at low magnification look in the same field of view ...
- National Optical Astronomy Observatory
... Figure 1: (X=color index (b-v), Y=Brightness (v)) According to the graph, the tip of the main sequence appears to lie around NGC 1496-1. This star’s color index is approximately 0.062, classifying it as a spectral type A star. Based on this observation, the age of the cluster is estimated to be no ...
... Figure 1: (X=color index (b-v), Y=Brightness (v)) According to the graph, the tip of the main sequence appears to lie around NGC 1496-1. This star’s color index is approximately 0.062, classifying it as a spectral type A star. Based on this observation, the age of the cluster is estimated to be no ...
Globular Clusters
... M11 in Scutum is not a Glob, but it is a very big open cluster, with around 3000 stars. It looks like a loose globular cluster that resolves easier. Once considered an intermediate cluster between open and globular clusters. It has fewer dim stars, and more bright stars, so there is less haze and mo ...
... M11 in Scutum is not a Glob, but it is a very big open cluster, with around 3000 stars. It looks like a loose globular cluster that resolves easier. Once considered an intermediate cluster between open and globular clusters. It has fewer dim stars, and more bright stars, so there is less haze and mo ...
Andromeda Check-List - Norman Lockyer Observatory
... Best viewed through moderate sized telescopes but still worth searching out through any binoculars or telescopes. This compact cluster lies south of Herschel’s Garnett Star and what makes it interesting is that it is cocooned in a very large and bright nebula NGC7142 – Open Cluster – II 2 r – Modera ...
... Best viewed through moderate sized telescopes but still worth searching out through any binoculars or telescopes. This compact cluster lies south of Herschel’s Garnett Star and what makes it interesting is that it is cocooned in a very large and bright nebula NGC7142 – Open Cluster – II 2 r – Modera ...
Document
... Students will learn how to interpret observational characteristics of stars in terms of the underlying physical parameters You should gain an understanding of how stars of different mass evolve, and what end products are produced Students should learn what causes planetary nebulae and supernovae You ...
... Students will learn how to interpret observational characteristics of stars in terms of the underlying physical parameters You should gain an understanding of how stars of different mass evolve, and what end products are produced Students should learn what causes planetary nebulae and supernovae You ...
MSci Astrophysics 210PHY412
... Students will learn how to interpret observational characteristics of stars in terms of the underlying physical parameters You should gain an understanding of how stars of different mass evolve, and what end products are produced Students should learn what causes planetary nebulae and supernovae You ...
... Students will learn how to interpret observational characteristics of stars in terms of the underlying physical parameters You should gain an understanding of how stars of different mass evolve, and what end products are produced Students should learn what causes planetary nebulae and supernovae You ...
Figure 1
... NGC5253 is a very nearby dwarf Irregular, hosting a central burst of star formation LEGUS observations at F275W and F336W are joined by ACS/WFC and HRC and WFC3/IR images from different programs Availability of both Ha (0.6563 mm) and Pb (1.282 mm) emission lines enables accurate foreground du ...
... NGC5253 is a very nearby dwarf Irregular, hosting a central burst of star formation LEGUS observations at F275W and F336W are joined by ACS/WFC and HRC and WFC3/IR images from different programs Availability of both Ha (0.6563 mm) and Pb (1.282 mm) emission lines enables accurate foreground du ...
MSci Astrophysics 210PHY412 - Queen's University Belfast
... Students will learn how to interpret observational characteristics of stars in terms of the underlying physical parameters You should gain an understanding of how stars of different mass evolve, and what end products are produced Students should learn what causes planetary nebulae and supernovae You ...
... Students will learn how to interpret observational characteristics of stars in terms of the underlying physical parameters You should gain an understanding of how stars of different mass evolve, and what end products are produced Students should learn what causes planetary nebulae and supernovae You ...
Groups of Stars
... amounts of gas and dust to form new stars. They are spherical and have a dense concentration of stars in the center. Can contain more than a million stars. Usually do not have short-lived blue stars because these stars have already died out. Astronomers estimate that the oldest globular clust ...
... amounts of gas and dust to form new stars. They are spherical and have a dense concentration of stars in the center. Can contain more than a million stars. Usually do not have short-lived blue stars because these stars have already died out. Astronomers estimate that the oldest globular clust ...
White Dwarfs
... Globular clusters formed 12-14 billion years ago. Useful info for studying the history of the Milky Way Galaxy. ...
... Globular clusters formed 12-14 billion years ago. Useful info for studying the history of the Milky Way Galaxy. ...
The mass function of star clusters formed in turbulent molecular clouds
... OCs evolve to less dense (From bottom to top in the panels) ...
... OCs evolve to less dense (From bottom to top in the panels) ...
Planets in different environments
... Boss (2011): In order to explain the formation of planets like those in HR 8799 in the context of the GI model, he had to assume that the outer disk was removed within 105 years by the FUV and EUV radiation of a nearby OB-star. Throop & Bally (2005) and Mitchell & Stewart (2010): Photo-evaporati ...
... Boss (2011): In order to explain the formation of planets like those in HR 8799 in the context of the GI model, he had to assume that the outer disk was removed within 105 years by the FUV and EUV radiation of a nearby OB-star. Throop & Bally (2005) and Mitchell & Stewart (2010): Photo-evaporati ...
Clusters of galaxies
... Identification, deep photometry and spectroscopy of 10 clusters around z ~ 0.5 and 10 around z ~ 0.8 Spectroscopy is FORS2 (R ~ 1200) Science goals are build up of stellar populations with redshift (plus weak lensing). ...
... Identification, deep photometry and spectroscopy of 10 clusters around z ~ 0.5 and 10 around z ~ 0.8 Spectroscopy is FORS2 (R ~ 1200) Science goals are build up of stellar populations with redshift (plus weak lensing). ...
Globular cluster
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite. Globular clusters are very tightly bound by gravity, which gives them their spherical shapes and relatively high stellar densities toward their centers. The name of this category of star cluster is derived from the Latin globulus—a small sphere. A globular cluster is sometimes known more simply as a globular.Globular clusters, which are found in the halo of a galaxy, contain considerably more stars and are much older than the less dense galactic, or open clusters, which are found in the disk. Globular clusters are fairly common; there are about 150 to 158 currently known globular clusters in the Milky Way, with perhaps 10 to 20 more still undiscovered. These globular clusters orbit the Galaxy at radii of 40 kiloparsecs (130,000 light-years) or more. Larger galaxies can have more: Andromeda, for instance, may have as many as 500. Some giant elliptical galaxies, particularly those at the centers of galaxy clusters, such as M87, have as many as 13,000 globular clusters.Every galaxy of sufficient mass in the Local Group has an associated group of globular clusters, and almost every large galaxy surveyed has been found to possess a system of globular clusters. The Sagittarius Dwarf galaxy and the disputed Canis Major Dwarf galaxy appear to be in the process of donating their associated globular clusters (such as Palomar 12) to the Milky Way. This demonstrates how many of this galaxy's globular clusters might have been acquired in the past.Although it appears that globular clusters contain some of the first stars to be produced in the galaxy, their origins and their role in galactic evolution are still unclear. It does appear clear that globular clusters are significantly different from dwarf elliptical galaxies and were formed as part of the star formation of the parent galaxy rather than as a separate galaxy. However, recent conjectures by astronomers suggest that globular clusters and dwarf spheroidals may not be clearly separate and distinct types of objects.