Spectral classification of O–M stars on the basis of UBV photometry
... direction. The practice of research of interstellar light absorption (e.g. Urasin et al. 1989) proves that for construction of such a dependence towards the Galactic periphery it is enough to know magnitudes and spectra of stars up to V = 15 mag only. Of course this absorption curve like the one sho ...
... direction. The practice of research of interstellar light absorption (e.g. Urasin et al. 1989) proves that for construction of such a dependence towards the Galactic periphery it is enough to know magnitudes and spectra of stars up to V = 15 mag only. Of course this absorption curve like the one sho ...
My Constellation
... begins in many parts of the world. Õ Alpha Aquarii ("Sadalmelik") and beta Aquarii ("Sadalsuud") are twin supergiants with nearly identical names. The names mean, respectively, "The Lucky One of the King" and "The Luckiest of the Lucky". Gamma Aquarii shares in the good fortune: "Sadachbia": "The Lu ...
... begins in many parts of the world. Õ Alpha Aquarii ("Sadalmelik") and beta Aquarii ("Sadalsuud") are twin supergiants with nearly identical names. The names mean, respectively, "The Lucky One of the King" and "The Luckiest of the Lucky". Gamma Aquarii shares in the good fortune: "Sadachbia": "The Lu ...
page proofs
... Shapley argued that the Milky Way was the entire universe and all the nebulae were therefore to be found within it. Curtis argued that some nebulae were actually separate galaxies of stars, well outside the Milky Way. For Curtis to be right, these galaxies must lie at enormous distances from the Ear ...
... Shapley argued that the Milky Way was the entire universe and all the nebulae were therefore to be found within it. Curtis argued that some nebulae were actually separate galaxies of stars, well outside the Milky Way. For Curtis to be right, these galaxies must lie at enormous distances from the Ear ...
AGN Science Collaboration - Active Galactic Nuclei Science
... - X-rays (not as deep as LSST) • LSST photometry / depth makes this problem more challenging than previous optical surveys. ...
... - X-rays (not as deep as LSST) • LSST photometry / depth makes this problem more challenging than previous optical surveys. ...
microquasars
... FORMATION OF THE BH IN GRS 1915+105 Black hole of 14 +/-4 M with a ~1 M donor (Greiner et al. 2002-3) VLBA astrometry during 7 yrs:6.8+/-0.2 mas/yr (Dhawan & Mirabel, 2005) ...
... FORMATION OF THE BH IN GRS 1915+105 Black hole of 14 +/-4 M with a ~1 M donor (Greiner et al. 2002-3) VLBA astrometry during 7 yrs:6.8+/-0.2 mas/yr (Dhawan & Mirabel, 2005) ...
Preliminary results of the Be stars proportion in LMC open
... To properly compare the SMC study with the LMC, it is needed to constrain the freedom degrees and therefore to use the same age distribution (see Fig. 3), leading to the metallicity being the only variable parameter. The LMC sample is formed by 90 open clusters distributed along the LMC. A total of ...
... To properly compare the SMC study with the LMC, it is needed to constrain the freedom degrees and therefore to use the same age distribution (see Fig. 3), leading to the metallicity being the only variable parameter. The LMC sample is formed by 90 open clusters distributed along the LMC. A total of ...
Refined stellar, orbital and planetary parameters of the eccentric
... complete transit light curves, and three partial events. One of these follow-up light curves (2007 April 21) was reported in the discovery paper. All of our individual high precision follow-up photometry data are plotted in Fig. 2, along with our best-fitting transit lightcurve model. The folded and ...
... complete transit light curves, and three partial events. One of these follow-up light curves (2007 April 21) was reported in the discovery paper. All of our individual high precision follow-up photometry data are plotted in Fig. 2, along with our best-fitting transit lightcurve model. The folded and ...
Gamma-ray burst has highest redshift yet seen
... from the 8-m Gemini North telescope that the new GRB’s redshift was about 8, clearly a record! By then dawn was breaking over Hawaii, so IR spectroscopy had to wait for nightfall at large telescopes in Chile and the Canaries.3 Together with the earlier photometry, the IR spectra yielded z = 8.26 ± 0 ...
... from the 8-m Gemini North telescope that the new GRB’s redshift was about 8, clearly a record! By then dawn was breaking over Hawaii, so IR spectroscopy had to wait for nightfall at large telescopes in Chile and the Canaries.3 Together with the earlier photometry, the IR spectra yielded z = 8.26 ± 0 ...
Conference Abstract Booklet here.
... stars show periodic or semi-periodic light and radial velocity fluctuations due to both radial and non-radial pulsations. A number of RCB stars are now being studied with K2. A correlation between pulsation phase and the timing of dust formation has been found in several RCB stars. This relationship ...
... stars show periodic or semi-periodic light and radial velocity fluctuations due to both radial and non-radial pulsations. A number of RCB stars are now being studied with K2. A correlation between pulsation phase and the timing of dust formation has been found in several RCB stars. This relationship ...
What CAN You See With a Telescope?
... can see objects down to the 10th magnitude. With an 8inch reflecting telescope an observer can manage to see objects of 14th magnitude on very dark nights 5 . The faintest objects detectable with today’s largest groundbased telescopes are about magnitude 30. Rotation Rates Influence Asteroid B ...
... can see objects down to the 10th magnitude. With an 8inch reflecting telescope an observer can manage to see objects of 14th magnitude on very dark nights 5 . The faintest objects detectable with today’s largest groundbased telescopes are about magnitude 30. Rotation Rates Influence Asteroid B ...
Galaxies: Interactions and Mergers Encyclopedia of Astronomy & Astrophysics eaa.iop.org C Mihos
... computational abilities). The N-body model is then advanced forward in discrete time steps by calculating the net gravitational acceleration acting on each particle from the other particles and then advancing each particle forward in time given its position, velocity and acceleration (for the inters ...
... computational abilities). The N-body model is then advanced forward in discrete time steps by calculating the net gravitational acceleration acting on each particle from the other particles and then advancing each particle forward in time given its position, velocity and acceleration (for the inters ...
Common Envelope Evolution Leading to Supernovae with Dense
... The suggested sequence of events leading to supernovae with dense environments is shown in Figure 1. The starting point is two massive stars in a binary. The more massive star evolves, transfers mass to its companion, and explodes as a supernova, leaving a neutron star (NS) or, less likely, a black ...
... The suggested sequence of events leading to supernovae with dense environments is shown in Figure 1. The starting point is two massive stars in a binary. The more massive star evolves, transfers mass to its companion, and explodes as a supernova, leaving a neutron star (NS) or, less likely, a black ...
Confirmation of Hostless Type Ia Supernovae Using Hubble Space
... field galaxies (Blanton et al. 2003), but αd may be higher in rich galaxy clusters (e.g., Milne et al. 2007). Adopting αd = −1.5 as an upper limit, the MENeaCS survey estimated that . 2% of the stellar mass in dwarf cluster galaxies below detection thresholds. If the SN Ia occurrence rate per unit m ...
... field galaxies (Blanton et al. 2003), but αd may be higher in rich galaxy clusters (e.g., Milne et al. 2007). Adopting αd = −1.5 as an upper limit, the MENeaCS survey estimated that . 2% of the stellar mass in dwarf cluster galaxies below detection thresholds. If the SN Ia occurrence rate per unit m ...
August - Naples Free-Net
... us to better understand the Sun’s corona, the spectra of stars, and to discover stellar and nebulous features too faint to be seen with the human eye. Working initially with a 7-inch refractor that was later upgraded to a 20-inch reflector, amateur astronomer Isaac Roberts pioneered a number of ast ...
... us to better understand the Sun’s corona, the spectra of stars, and to discover stellar and nebulous features too faint to be seen with the human eye. Working initially with a 7-inch refractor that was later upgraded to a 20-inch reflector, amateur astronomer Isaac Roberts pioneered a number of ast ...
2. The Universe Is Expanding and Evolving
... taken over several months), you knew the luminosity. And knowing both the intrinsic luminosity and the measured apparent brightness of the star (i.e. the brightness as measured here on Earth), you could determine its distance using the inverse square law (a star of a given luminosity appears four ti ...
... taken over several months), you knew the luminosity. And knowing both the intrinsic luminosity and the measured apparent brightness of the star (i.e. the brightness as measured here on Earth), you could determine its distance using the inverse square law (a star of a given luminosity appears four ti ...
THE MYSTERIOUS SICKLE OBJECT IN THE CARINA NEBULA: A
... Stellar parameters — The observed crescent is associated to the B1.5 V star MJ 218 as listed by Massey & Johnson (1993) in their spectroscopic and photometric analysis of the stars in and around the clusters Trumpler 14 and Trumpler 16. MJ 218 alias 2MASS J104405085933412, alias ALS 19740 in Reed (2 ...
... Stellar parameters — The observed crescent is associated to the B1.5 V star MJ 218 as listed by Massey & Johnson (1993) in their spectroscopic and photometric analysis of the stars in and around the clusters Trumpler 14 and Trumpler 16. MJ 218 alias 2MASS J104405085933412, alias ALS 19740 in Reed (2 ...
Chapman
... •Until the mid-1990’s the only z>2 objects known were QSOs, radio galaxies, and QS0 absorbers (DLA/LLS) • How can we go about isolating more normal galaxies during the epoch of star/galaxy formation? • The study of high-redshift (let’s say z>1.5) galaxies has exploded in the last ~10 years, with mul ...
... •Until the mid-1990’s the only z>2 objects known were QSOs, radio galaxies, and QS0 absorbers (DLA/LLS) • How can we go about isolating more normal galaxies during the epoch of star/galaxy formation? • The study of high-redshift (let’s say z>1.5) galaxies has exploded in the last ~10 years, with mul ...
Magnetic susceptibility, magnetization, magnetic moment and
... Abstract. Four years after the last LISA meeting, the NASA Astrophysics Data System (ADS) finds itself in the middle of major changes to the infrastructure and contents of its database. In this paper we highlight a number of features of great importance to librarians and discuss the additional funct ...
... Abstract. Four years after the last LISA meeting, the NASA Astrophysics Data System (ADS) finds itself in the middle of major changes to the infrastructure and contents of its database. In this paper we highlight a number of features of great importance to librarians and discuss the additional funct ...
Mass segregation in star clusters is not energy equipartition
... not slow down faster than the average stars during mass segregation. In some ways this is not surprising; as the massive stars move towards the cluster centre, they fall deeper into the gravitational potential and would be expected to speed up. Once in the cluster centre, they often behave as a sepa ...
... not slow down faster than the average stars during mass segregation. In some ways this is not surprising; as the massive stars move towards the cluster centre, they fall deeper into the gravitational potential and would be expected to speed up. Once in the cluster centre, they often behave as a sepa ...
Galactic Nebulae
... Beautiful emission / reflection nebula surrounding massive Ionizing central star . Nebula is located at eastern end of Dark clouds . Cluster of stars at centre of IC5146 are of low mass and young (1 million years old) - pre main sequence stars. ...
... Beautiful emission / reflection nebula surrounding massive Ionizing central star . Nebula is located at eastern end of Dark clouds . Cluster of stars at centre of IC5146 are of low mass and young (1 million years old) - pre main sequence stars. ...
Lecture 9: Supernovae
... The light-curve behaved exactly as expected: after the initial increase, it faded quickly until June 1987. Then it settled into a much slower fade, of about 1% a day, for two years. This corresponds exactly to the laboratory-measured half-life of 56 Co (77 days), which is the result of the (rapid) d ...
... The light-curve behaved exactly as expected: after the initial increase, it faded quickly until June 1987. Then it settled into a much slower fade, of about 1% a day, for two years. This corresponds exactly to the laboratory-measured half-life of 56 Co (77 days), which is the result of the (rapid) d ...
ASTA33 Lab: The rotation curve of the Milky Way
... to better t the course content of ASTA33. Giorgi ...
... to better t the course content of ASTA33. Giorgi ...
Chemical Composition of Planetary Nebulae: The Galaxy and the
... evolution of the Galaxy and the Magellanic Clouds. They are the offspring of stars in a mass range of roughly 0.8 to 8 M , so that a relatively wide distribution of ages and population types can in principle be observed. Chemical abundances of PN are derived for several elements, so that empirical d ...
... evolution of the Galaxy and the Magellanic Clouds. They are the offspring of stars in a mass range of roughly 0.8 to 8 M , so that a relatively wide distribution of ages and population types can in principle be observed. Chemical abundances of PN are derived for several elements, so that empirical d ...
Winds from clusters with non-uniform stellar distribution
... 4038/4039), dwarf galaxies, classical starbursts, as well as in our galaxy amongst many other systems (for a review see Whitmore 2001). These star clusters can contain hundreds or thousands of very young, energetic stars, and have stellar densities far greater than those seen in normal OB associatio ...
... 4038/4039), dwarf galaxies, classical starbursts, as well as in our galaxy amongst many other systems (for a review see Whitmore 2001). These star clusters can contain hundreds or thousands of very young, energetic stars, and have stellar densities far greater than those seen in normal OB associatio ...
docx - UT Austin (Astronomy)
... different graphs of brightness vs. time are shown on the right. Match each exoplanet system with the graph that best represents the brightness we would observe for the star in that system. All the stars are identical and that each exoplanet crosses directly between its parent star and Earth. Recall ...
... different graphs of brightness vs. time are shown on the right. Match each exoplanet system with the graph that best represents the brightness we would observe for the star in that system. All the stars are identical and that each exoplanet crosses directly between its parent star and Earth. Recall ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.