talk
... “Threshold” column density varies by a factor of ~4 between sample galaxies No correlation between “threshold” column density and metallicity ...
... “Threshold” column density varies by a factor of ~4 between sample galaxies No correlation between “threshold” column density and metallicity ...
The Norma cluster (ACO3627) – II. The near-infrared Ks
... seem to have a steeper bright end than those without cD galaxies. Often the brightest galaxy is excluded to obtain a better fit, particularly in cD clusters. The Schechter parameters have also been found to vary depending on the region sampled within the cluster, the size of the area and the limitin ...
... seem to have a steeper bright end than those without cD galaxies. Often the brightest galaxy is excluded to obtain a better fit, particularly in cD clusters. The Schechter parameters have also been found to vary depending on the region sampled within the cluster, the size of the area and the limitin ...
Module 11.1.1: Galaxies: Morphology and the Hubble Sequence
... the sense that it's a large bulge with relatively small or rather unimportant disk, and disk that doesn't have a lot of active star formation. And just like other spiral galaxies, these S0's, or l ...
... the sense that it's a large bulge with relatively small or rather unimportant disk, and disk that doesn't have a lot of active star formation. And just like other spiral galaxies, these S0's, or l ...
instructor notes stellar evolution, star clusters
... The effect shows up in the H-R diagrams for young clusters as a lower main-sequence turn-on point. Many, but not all, pre-main-sequence stars are still associated with the material from which they formed. Often such stars are found to be losing mass and to have emission lines in their spectra origi ...
... The effect shows up in the H-R diagrams for young clusters as a lower main-sequence turn-on point. Many, but not all, pre-main-sequence stars are still associated with the material from which they formed. Often such stars are found to be losing mass and to have emission lines in their spectra origi ...
instructor notes stellar evolution, star clusters
... The effect shows up in the H-R diagrams for young clusters as a lower main-sequence turn-on point. Many, but not all, pre-main-sequence stars are still associated with the material from which they formed. Often such stars are found to be losing mass and to have emission lines in their spectra origi ...
... The effect shows up in the H-R diagrams for young clusters as a lower main-sequence turn-on point. Many, but not all, pre-main-sequence stars are still associated with the material from which they formed. Often such stars are found to be losing mass and to have emission lines in their spectra origi ...
Meteor Shower Observations
... Just as sporadic meteors tend to be more numerous in the predawn hours, so do shower meteors. A few meteoroid swarms, however, catch Earth from behind. Most notably the Arietid Meteor shower catches Earth from behind in June of each year. This results in evening meteors rather day predawn meteors. T ...
... Just as sporadic meteors tend to be more numerous in the predawn hours, so do shower meteors. A few meteoroid swarms, however, catch Earth from behind. Most notably the Arietid Meteor shower catches Earth from behind in June of each year. This results in evening meteors rather day predawn meteors. T ...
The Extragalactic Group of MPE and USM
... of Massive Galaxies in the FORS Deep and GOODS South fields • Study evolution of galaxies with broadband deep U to K surveys. • LFs, Mass Functions, SFRs do not require spectroscopy but can be derived with accurate photometric redshifts. • Advantage of photo z: no color selection bias, fainter lumin ...
... of Massive Galaxies in the FORS Deep and GOODS South fields • Study evolution of galaxies with broadband deep U to K surveys. • LFs, Mass Functions, SFRs do not require spectroscopy but can be derived with accurate photometric redshifts. • Advantage of photo z: no color selection bias, fainter lumin ...
Long-term monitoring of the short period SU UMa
... where cr52−201 denotes the countrate in channel 52-201. precursor-main superoutburst is hardly observed. For suWith a little algebra, we can obtain the X-ray luminosity peroutbursts without a precursor, a handful of systems, between 0.5-2.5 keV is 1031.0±0.2 erg s−1 . Although the especially archety ...
... where cr52−201 denotes the countrate in channel 52-201. precursor-main superoutburst is hardly observed. For suWith a little algebra, we can obtain the X-ray luminosity peroutbursts without a precursor, a handful of systems, between 0.5-2.5 keV is 1031.0±0.2 erg s−1 . Although the especially archety ...
WHAT MAKES A STAR SO SPECIAL Abstract
... classification to the students (you can use the information from the Introduction section as a supplement to the lesson about Star characteristics in the textbook you are using). 2. The teacher gives every student an envelope with 5 star circles and a table with the characteristics of 5 stars. 3. St ...
... classification to the students (you can use the information from the Introduction section as a supplement to the lesson about Star characteristics in the textbook you are using). 2. The teacher gives every student an envelope with 5 star circles and a table with the characteristics of 5 stars. 3. St ...
Article PDF - IOPscience
... wide range of colors (and include RR Lyrae variables), Fornax 4 is seen to have a red horizontal branch. Fornax 4 is D3 Gyr younger than the other Fornax globulars. Buonanno et al. draw attention to the fact that the colormagnitude diagram of Fornax 4 exhibits a strong resemblance to that of the ““ ...
... wide range of colors (and include RR Lyrae variables), Fornax 4 is seen to have a red horizontal branch. Fornax 4 is D3 Gyr younger than the other Fornax globulars. Buonanno et al. draw attention to the fact that the colormagnitude diagram of Fornax 4 exhibits a strong resemblance to that of the ““ ...
Late Summer Messier Objects
... In addition, they are well-placed only during the summer, when the nights are at their shortest and the logistics of observing are most problematic. But they are not quite as bad in this regard as the objects between RA 15 and RA 18, at least not for people who do most of their observing in the even ...
... In addition, they are well-placed only during the summer, when the nights are at their shortest and the logistics of observing are most problematic. But they are not quite as bad in this regard as the objects between RA 15 and RA 18, at least not for people who do most of their observing in the even ...
Astronomy Astrophysics First detection of the field star overdensity in the Perseus... &
... the two sets of physical parameters. This cleanest sample contains 8328 stars and is named CS-MB or CS-EC depending on whether their physical parameters were computed using the MB or EC method (see Fig. 1). This sample contains stars with more accurate SPP data, but has fewer statistics owing to the ...
... the two sets of physical parameters. This cleanest sample contains 8328 stars and is named CS-MB or CS-EC depending on whether their physical parameters were computed using the MB or EC method (see Fig. 1). This sample contains stars with more accurate SPP data, but has fewer statistics owing to the ...
Stargazing For Beginners: A Binocular Tour of the Southern Night Sky
... star. It’s defined as the apparent magnitude of an object if it was 32.616 light-years away. So while the sun has an apparent magnitude of -26, if we could see it at a distance of 32.616 light-years, it would shine at a very modest magnitude ...
... star. It’s defined as the apparent magnitude of an object if it was 32.616 light-years away. So while the sun has an apparent magnitude of -26, if we could see it at a distance of 32.616 light-years, it would shine at a very modest magnitude ...
Observing Stellar Evolution
... Stellar evolution – refers to the stages in the lifetime of one star. When biologists talk about evolution they mean intergenerational evolution. While stars change from one generation to the next, the focus of this program is stellar lifetimes. Burning – The materials that comprise stars do not 'bu ...
... Stellar evolution – refers to the stages in the lifetime of one star. When biologists talk about evolution they mean intergenerational evolution. While stars change from one generation to the next, the focus of this program is stellar lifetimes. Burning – The materials that comprise stars do not 'bu ...
the Local Group - Simon P Driver
... • to turn a map of the sky into a 3-D picture of the Local Group, we need galaxy distances – Hubble’s law does not apply within the Group because expansion has halted • need to remember that the uncertainty in the distance is ~10% even for bright galaxies – e.g. for the LMC, the range found for ...
... • to turn a map of the sky into a 3-D picture of the Local Group, we need galaxy distances – Hubble’s law does not apply within the Group because expansion has halted • need to remember that the uncertainty in the distance is ~10% even for bright galaxies – e.g. for the LMC, the range found for ...
ROTATION CURVES OF HIGH-LUMINOSITY SPIRAL GALAXIES
... projection uncertainties) are generally less than 8 km/s per point. Reproductions of 10 spectra are shown in Fig. 1. Rotation curves are drawn in Fig. 2; data for NGC 4594 come from Schweizer (1978). The following conclusions come from analysis of these data (Rubin, Ford, and Thonnard 1978): (1) All ...
... projection uncertainties) are generally less than 8 km/s per point. Reproductions of 10 spectra are shown in Fig. 1. Rotation curves are drawn in Fig. 2; data for NGC 4594 come from Schweizer (1978). The following conclusions come from analysis of these data (Rubin, Ford, and Thonnard 1978): (1) All ...
A History of Star Catalogues - The Albuquerque Astronomical Society
... circle in a motion called precession. So the north pole doesn’t always point at a particular star but gradually traces out a circle over a period of 25800 years. The radius of the circle is 23.5 degrees, really a rather large number. The precession of the poles is about 50.27 arc seconds per year o ...
... circle in a motion called precession. So the north pole doesn’t always point at a particular star but gradually traces out a circle over a period of 25800 years. The radius of the circle is 23.5 degrees, really a rather large number. The precession of the poles is about 50.27 arc seconds per year o ...
Star 1 A star is a massive, luminous ball of plasma held together by
... hundreds of thousands of stars located one billion light years away[37] —ten times the distance of the most distant star cluster previously observed. ...
... hundreds of thousands of stars located one billion light years away[37] —ten times the distance of the most distant star cluster previously observed. ...
Starburst Galaxies - Beck-Shop
... them. It is likely that they also produce many of the lower mass stars, but these are too faint to detect and so that cannot be confirmed observationally. During the early stages of the universe the contribution of starbursts to the overall production of stars may have been even higher. The extreme ...
... them. It is likely that they also produce many of the lower mass stars, but these are too faint to detect and so that cannot be confirmed observationally. During the early stages of the universe the contribution of starbursts to the overall production of stars may have been even higher. The extreme ...
{2.} and {4.}
... Constellations are the way that many learn about the sky and help as a memory aid to the stars that form the figures, the constellations did organize this endless wonder, our sky. As scientist looked longer at our sky they categorized stars and found that they could predict their movement, making an ...
... Constellations are the way that many learn about the sky and help as a memory aid to the stars that form the figures, the constellations did organize this endless wonder, our sky. As scientist looked longer at our sky they categorized stars and found that they could predict their movement, making an ...
SherwoodWA_1973redux - Edinburgh Research Archive
... 1970; Gottesman and Davis, 1970) found that the HII regions and blue supergiants (in associations) lie within the ...
... 1970; Gottesman and Davis, 1970) found that the HII regions and blue supergiants (in associations) lie within the ...
a changing cosmos - Whittier Union High School District
... asteroids. There is also a project called Space Guard which is an international network of telescopes and people working together to discover and track asteroids, with the idea of providing lots of advance warning if an asteroid is found to be on a collision course with Earth, so that an effort coul ...
... asteroids. There is also a project called Space Guard which is an international network of telescopes and people working together to discover and track asteroids, with the idea of providing lots of advance warning if an asteroid is found to be on a collision course with Earth, so that an effort coul ...
Sec 30.1 - Highland High School
... Mass of the Milky Way Stellar populations in the Milky Way There are few stars and little interstellar material currently forming in the halo or the nuclear bulge of the galaxy, and this is one of the distinguishing features of Population II stars. Age is another, and can be determined by the lower ...
... Mass of the Milky Way Stellar populations in the Milky Way There are few stars and little interstellar material currently forming in the halo or the nuclear bulge of the galaxy, and this is one of the distinguishing features of Population II stars. Age is another, and can be determined by the lower ...
Aries (constellation)
Aries is one of the constellations of the zodiac. It is located in the northern celestial hemisphere between Pisces to the west and Taurus to the east. The name Aries is Latin for ram, and its symbol is 20px (Unicode ♈), representing a ram's horns. It is one of the 48 constellations described by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations. It is a mid-sized constellation, ranking 39th overall size, with an area of 441 square degrees (1.1% of the celestial sphere).Although Aries came to represent specifically the ram whose fleece became the Golden Fleece of Ancient Greek mythology, it has represented a ram since late Babylonian times. Before that, the stars of Aries formed a farmhand. Different cultures have incorporated the stars of Aries into different constellations including twin inspectors in China and a porpoise in the Marshall Islands. Aries is a relatively dim constellation, possessing only four bright stars: Hamal (Alpha Arietis, second magnitude), Sheratan (Beta Arietis, third magnitude), Mesarthim (Gamma Arietis, fourth magnitude), and 41 Arietis (also fourth magnitude). The few deep-sky objects within the constellation are quite faint and include several pairs of interacting galaxies. Several meteor showers appear to radiate from Aries, including the Daytime Arietids and the Epsilon Arietids.