Chapter 16--Properties of Stars
... mysterious points of light in the sky. We now know that all stars form in great clouds of gas and dust. Each star begins its life with roughly the same chemical composition: About three-quarters of the star’s mass at birth is hydrogen, and about one-quarter is helium, with no more than about 2% cons ...
... mysterious points of light in the sky. We now know that all stars form in great clouds of gas and dust. Each star begins its life with roughly the same chemical composition: About three-quarters of the star’s mass at birth is hydrogen, and about one-quarter is helium, with no more than about 2% cons ...
Astronomy Astrophysics NGC 7419 as a template for red supergiant clusters &
... spectroscopy around the Hα line for most of the candidate Be stars, confirming their nature. A second peculiarity of NGC 7419 is the presence of five red supergiants (RSGs) as confirmed radial velocity members of the cluster (Beauchamp et al. 1994). Until recently, this was the highest number of RSG ...
... spectroscopy around the Hα line for most of the candidate Be stars, confirming their nature. A second peculiarity of NGC 7419 is the presence of five red supergiants (RSGs) as confirmed radial velocity members of the cluster (Beauchamp et al. 1994). Until recently, this was the highest number of RSG ...
Marking Scheme of Observational Sessions
... mark every report and SELECT 8 REPORTS THAT HAVE HIGEST MARKS to enter to the marks list. If the observer will be drawn deep sky objects such as ( Nebulas, Galaxies, Messier objects in the constellation mapping area, Give MINUS MARKS for that. ( drawing those objects inside constellation mapping are ...
... mark every report and SELECT 8 REPORTS THAT HAVE HIGEST MARKS to enter to the marks list. If the observer will be drawn deep sky objects such as ( Nebulas, Galaxies, Messier objects in the constellation mapping area, Give MINUS MARKS for that. ( drawing those objects inside constellation mapping are ...
Rotation Periods of Wide Binaries in the Kepler Field
... stars and other stars with known ages to derive a period-age-color relation of the form P = aAn (B − V − c)b , where A is the age of a star in Myr and a, b, and n are constants. They found however that some stars exhibited large deviations from the mean relation. Mamajek & Hillenbrand (2008), compar ...
... stars and other stars with known ages to derive a period-age-color relation of the form P = aAn (B − V − c)b , where A is the age of a star in Myr and a, b, and n are constants. They found however that some stars exhibited large deviations from the mean relation. Mamajek & Hillenbrand (2008), compar ...
Devil physics The baddest class on campus IB Physics
... Apparent magnitude is based on view from earth Two stars may have the same apparent ...
... Apparent magnitude is based on view from earth Two stars may have the same apparent ...
Sample pages 1 PDF
... its two brightest regions, the larger of which is M42 (NGC 1976) and the other M43 (NGC 1982). The Orion Molecular Cloud Complex is generally a site of active star formation, and the Orion Nebula is no exception. Long-exposure photographs reveal all sorts of complex features, including star clusters ...
... its two brightest regions, the larger of which is M42 (NGC 1976) and the other M43 (NGC 1982). The Orion Molecular Cloud Complex is generally a site of active star formation, and the Orion Nebula is no exception. Long-exposure photographs reveal all sorts of complex features, including star clusters ...
Do We Know of Any Maunder Minimum Stars?
... the WMBV sample is not composed entirely of solar mass, solar metallicity stars, as Figure 2 makes clear (for the Sun, B −V = 0.656). Stars with M < M⊙ evolve more slowly than more massive stars, and so will have lower ∆MV -values than their solar-type counterparts of the same age. It is these less- ...
... the WMBV sample is not composed entirely of solar mass, solar metallicity stars, as Figure 2 makes clear (for the Sun, B −V = 0.656). Stars with M < M⊙ evolve more slowly than more massive stars, and so will have lower ∆MV -values than their solar-type counterparts of the same age. It is these less- ...
A History of Star Catalogues - The Albuquerque Astronomical Society
... Almagest star catalog in De Revolutionibus. The catalog contains 1028 stars. Each star entry contains a description of its position within its constellation, its ecliptic longitude and latitude and its magnitude on a scale of 1 (brightest) to 6 (dimmest visible stars). The precision of the catalog i ...
... Almagest star catalog in De Revolutionibus. The catalog contains 1028 stars. Each star entry contains a description of its position within its constellation, its ecliptic longitude and latitude and its magnitude on a scale of 1 (brightest) to 6 (dimmest visible stars). The precision of the catalog i ...
Metal-poor Stars
... Population III stars and concluded that long-lived low-mass star could not easily form from zero-metallicity gas, and hence were extremely rare, if not altogether absent. Today, we know that star formation in zero-metallicity gas indeed does not favor the creation of low-mass stars due to insufficie ...
... Population III stars and concluded that long-lived low-mass star could not easily form from zero-metallicity gas, and hence were extremely rare, if not altogether absent. Today, we know that star formation in zero-metallicity gas indeed does not favor the creation of low-mass stars due to insufficie ...
Have You Seen Canopus Tonight?
... Canopus should dazzle us too. Most stars familiar to us appear four to sixteen times fainter than Sirius; only Canopus can compete with the Dog Star. Half as bright, we should all know this star. But, have you seen Canopus tonight? In ancient Egypt, 15 miles east of Alexandria, there once stood a se ...
... Canopus should dazzle us too. Most stars familiar to us appear four to sixteen times fainter than Sirius; only Canopus can compete with the Dog Star. Half as bright, we should all know this star. But, have you seen Canopus tonight? In ancient Egypt, 15 miles east of Alexandria, there once stood a se ...
Colloquial Jakartan Indonesian
... which one steers) and the Micronesian etak (a ‘moving’ reference point) which refer to concepts incompatible with Western navigation theory. For some of these we may be able to offer a Proto Oceanic (POc) origin. Undoubtedly, as navigation skills developed and were refined in the Pacific, new terms ...
... which one steers) and the Micronesian etak (a ‘moving’ reference point) which refer to concepts incompatible with Western navigation theory. For some of these we may be able to offer a Proto Oceanic (POc) origin. Undoubtedly, as navigation skills developed and were refined in the Pacific, new terms ...
THE N/O RATIO IN EARLY B-TYPE MAIN SEQUENCE STARS AS
... This paper is based on previous studies of MS B-stars which were published between 2000 and 2008 by Lyubimkov, et al. [8-12]. High resolution spectra for more than 100 MS B-stars were obtained [8] at two observatories, the Crimean Astrophysical Observatory and the MacDonald Observatory of the Unive ...
... This paper is based on previous studies of MS B-stars which were published between 2000 and 2008 by Lyubimkov, et al. [8-12]. High resolution spectra for more than 100 MS B-stars were obtained [8] at two observatories, the Crimean Astrophysical Observatory and the MacDonald Observatory of the Unive ...
Archaeoastronomical Study of the Main Pyramids of Giza
... lowest one in the maps. Obviously this choice is opposite to that adopted by the cartographers of the XVII century who decided to put North on the top of their maps, a convention that we too continue to make today. In any case there is no objective reason to put necessarily North at the top of the g ...
... lowest one in the maps. Obviously this choice is opposite to that adopted by the cartographers of the XVII century who decided to put North on the top of their maps, a convention that we too continue to make today. In any case there is no objective reason to put necessarily North at the top of the g ...
Neon abundances - UCL Astrophysics Group
... Some of the other stars in the two samples were lacking data in the red region, or were cooler than 10 000 K, and we did not expect to observe any Ne i lines. Physical parameters of the stars in this study are given in Table 1. All observations were obtained with the Hamilton Echelle Spectrograph (H ...
... Some of the other stars in the two samples were lacking data in the red region, or were cooler than 10 000 K, and we did not expect to observe any Ne i lines. Physical parameters of the stars in this study are given in Table 1. All observations were obtained with the Hamilton Echelle Spectrograph (H ...
Rotation Periods and Relative Ages of Solar-Type Stars
... B - V spectral type. The formula for the calculation of rotation periods was derived from Noyes’ algorithm for determining Rossby number from mean stellar activity. A more detailed description is given by Noyes et al. (1984). These calculated rotation periods were compared against the observed rotat ...
... B - V spectral type. The formula for the calculation of rotation periods was derived from Noyes’ algorithm for determining Rossby number from mean stellar activity. A more detailed description is given by Noyes et al. (1984). These calculated rotation periods were compared against the observed rotat ...
Astrophysics Pristine CNO abundances from Magellanic Cloud B stars
... this option as it would have resulted in the loss of the strategic Si iii triplet near 4560 Å (dichroic gap). We finally chose the UVES standard setting Blue 437 nm (3760 Å < λ < 4980 Å) covering all the strategic lines for a classical abundance fine analysis of B stars. The atmospheric dispersio ...
... this option as it would have resulted in the loss of the strategic Si iii triplet near 4560 Å (dichroic gap). We finally chose the UVES standard setting Blue 437 nm (3760 Å < λ < 4980 Å) covering all the strategic lines for a classical abundance fine analysis of B stars. The atmospheric dispersio ...
THE MONTHLY SKY GUIDE, SIXTH EDITION
... Most bright stars, and several not-so-bright ones, have strangesounding names. Other stars are known merely by letters and numbers. These designations arose in various ways, as follows. A number of star names date back to Greek and Roman times. For example, the name of the brightest star in the sky, ...
... Most bright stars, and several not-so-bright ones, have strangesounding names. Other stars are known merely by letters and numbers. These designations arose in various ways, as follows. A number of star names date back to Greek and Roman times. For example, the name of the brightest star in the sky, ...
CONSTELLATION PERSEUS The constellation
... magnitude 1.79. It and many of the surrounding stars are members of an open cluster known as the Alpha Persei Cluster. The best-known star, however, is Algol (Beta Persei), linked with ominous legends because of its variability, which is noticeable to the naked eye. Rather than being an intrinsicall ...
... magnitude 1.79. It and many of the surrounding stars are members of an open cluster known as the Alpha Persei Cluster. The best-known star, however, is Algol (Beta Persei), linked with ominous legends because of its variability, which is noticeable to the naked eye. Rather than being an intrinsicall ...
Polaris
... That’s because it’s located nearly at the north celestial pole, the point around which the entire northern sky turns. Polaris marks the way due north. As you face Polaris and stretch your arms sideways, your right hand points due east, and your left hand points due west. About-face of Polaris steers ...
... That’s because it’s located nearly at the north celestial pole, the point around which the entire northern sky turns. Polaris marks the way due north. As you face Polaris and stretch your arms sideways, your right hand points due east, and your left hand points due west. About-face of Polaris steers ...
Night Sky Observations
... above you). The horizon is equal to 0 degrees and the zenith is 90 degrees. Azimuth is the 360 degree circle around you, 0 degrees being due north, 90 degrees east, 180 degrees south and 270 degrees west. 360 degrees is north again (also equal to zero). Right Ascension/South Declination: A more comp ...
... above you). The horizon is equal to 0 degrees and the zenith is 90 degrees. Azimuth is the 360 degree circle around you, 0 degrees being due north, 90 degrees east, 180 degrees south and 270 degrees west. 360 degrees is north again (also equal to zero). Right Ascension/South Declination: A more comp ...
Chromospherically young, kinematically old stars
... which are given with formal uncertainties. The last column shows the velocity criteria used in order to classify the object as a CYKOS. The results also show that CYKOS are generally more apparent in V than in the other velocity components, as expected for a kinematically old stellar population: the ...
... which are given with formal uncertainties. The last column shows the velocity criteria used in order to classify the object as a CYKOS. The results also show that CYKOS are generally more apparent in V than in the other velocity components, as expected for a kinematically old stellar population: the ...
What To See Telescope(Jul-Sept) v1 - One
... locate specific major constellations. To help you get oriented, the last appendix includes three whole-sky maps that show the constellations as seen from mid-northern latitudes in July, August, and September. Your telescope may have come with at least two eyepieces, and you may have acquired one or ...
... locate specific major constellations. To help you get oriented, the last appendix includes three whole-sky maps that show the constellations as seen from mid-northern latitudes in July, August, and September. Your telescope may have come with at least two eyepieces, and you may have acquired one or ...
Science Grade 08 Unit 11 Exemplar Lesson 02: Classifying Stars
... 9. Ask for student volunteers from each group to explain the reasoning behind their group’s sequencing. Acknowledge all answers, but do not correct at this point. Collect the cards. 10. Project the Teacher Resource: PowerPoint: Galaxies and Stars and discuss slides 10–18 with students. Instruct stud ...
... 9. Ask for student volunteers from each group to explain the reasoning behind their group’s sequencing. Acknowledge all answers, but do not correct at this point. Collect the cards. 10. Project the Teacher Resource: PowerPoint: Galaxies and Stars and discuss slides 10–18 with students. Instruct stud ...
Lithium abundances along the red giant branch: FLAMES
... agreed with the expected value for the difference in heliocentric correction, and the same shift was found for all spectra obtained at a given time. Therefore, we can exclude that these shifts are the result of orbital motion in a binary system. No other velocity shifts were found within the accuracy ...
... agreed with the expected value for the difference in heliocentric correction, and the same shift was found for all spectra obtained at a given time. Therefore, we can exclude that these shifts are the result of orbital motion in a binary system. No other velocity shifts were found within the accuracy ...
Searching for RR Lyrae Stars in M15
... pulsate radially with short periods. They were first discovered in nearby globular clusters about a 120 years ago. Today, around 1,500 RR Lyrae stars have been found in globular clusters (GCs) and around 6,000 isolated stars are known to be RR Lyrae [5]. They pulsate in radius and luminosity over sh ...
... pulsate radially with short periods. They were first discovered in nearby globular clusters about a 120 years ago. Today, around 1,500 RR Lyrae stars have been found in globular clusters (GCs) and around 6,000 isolated stars are known to be RR Lyrae [5]. They pulsate in radius and luminosity over sh ...
Crux
Crux /ˈkrʌks/, located in the deep southern sky, is the smallest yet one of the most distinctive of the 88 modern constellations. Its name is Latin for cross, and it is dominated by a cross-shaped asterism that is commonly known as the Southern Cross. Although visible to the Ancient Greeks, it was seen as part of the constellation Centaurus, and not defined or accurately mapped till the 16th century.Known as Acrux, blue-white Alpha Crucis is the constellation's brightest star and the bottom star of the cross. Nearly as bright are Beta and Gamma, while Delta and Epsilon make up the asterism. Many of the constellation's brighter stars are members of the Scorpius–Centaurus Association, a loose group of hot blue-white stars that appear to share a common origin and motion across the Milky Way. Two star systems have been found to have planets. The constellation also contains four Cepheid variables visible to the naked eye under optimum conditions. Crux also contains the Jewel Box, a bright open cluster, and the Coalsack Nebula, the most prominent dark nebula in the sky.