M101: The Pinwheel Galaxy
... Major (The Great Bear). We are seeing M101 as it looked 25 million years ago.The light we are seeing from the galaxy began its journey to Earth at the beginning of our planet’s Miocene Period, when mammals flourished and the Mastodon first appeared. ...
... Major (The Great Bear). We are seeing M101 as it looked 25 million years ago.The light we are seeing from the galaxy began its journey to Earth at the beginning of our planet’s Miocene Period, when mammals flourished and the Mastodon first appeared. ...
Animals in “Light, Energy, and the EM Spectrum” Comic
... And don’t forget the Hunting Dogs, Canes Venatici. Located about a third of the way from the end of the Big Dipper's handle and below it, these dogs were placed in the sky to assist Boötes, the Bear Driver, in his daily task of pursuing the Big Bear (Ursa Major) around the pole of the heavens. Dolph ...
... And don’t forget the Hunting Dogs, Canes Venatici. Located about a third of the way from the end of the Big Dipper's handle and below it, these dogs were placed in the sky to assist Boötes, the Bear Driver, in his daily task of pursuing the Big Bear (Ursa Major) around the pole of the heavens. Dolph ...
X-Ray Binaries
... Formation Scenarios • the present size of many XRB’s (∼ 0.1 − 10 R¯) is much smaller than the size of a blue/red supergiant, the progenitor of the compact object → require drastic shrinkage of orbit • common-envelope evolution ...
... Formation Scenarios • the present size of many XRB’s (∼ 0.1 − 10 R¯) is much smaller than the size of a blue/red supergiant, the progenitor of the compact object → require drastic shrinkage of orbit • common-envelope evolution ...
Production of Manganese-53 in a Self
... number of stars formed in the cloud during the time step from a Poisson random distribution generator using an average star formation timescale of 1000 years. For each star that forms, we use a random number to determine the stellar mass from an initial mass function [6] and three random numbers to ...
... number of stars formed in the cloud during the time step from a Poisson random distribution generator using an average star formation timescale of 1000 years. For each star that forms, we use a random number to determine the stellar mass from an initial mass function [6] and three random numbers to ...
X-ray binaries
... or on mass function derived from X-ray observations. If a source is unidentified in optics, but exhibits Type I X-ray bursts, or just has a small (<0.5 days) orbital period, then it can be clasified as a LMXB with a NS. In addition, spectral similarities with known LMXBs can result in classification ...
... or on mass function derived from X-ray observations. If a source is unidentified in optics, but exhibits Type I X-ray bursts, or just has a small (<0.5 days) orbital period, then it can be clasified as a LMXB with a NS. In addition, spectral similarities with known LMXBs can result in classification ...
The Distribution of Stars Most Likely to Harbor Intelligent Life
... most likely to possess habitable planets. In section 4 we impose the requirement that the habitable star lifetime must exceed the time required for intelligence to evolve Ti (= age of the star when intelligence evolved). This allows us to obtain the stellar distribution as a function of Ti . We dis ...
... most likely to possess habitable planets. In section 4 we impose the requirement that the habitable star lifetime must exceed the time required for intelligence to evolve Ti (= age of the star when intelligence evolved). This allows us to obtain the stellar distribution as a function of Ti . We dis ...
Elliptical galaxies
... •Due to seeing, stars have finite extent (not observed as point sources). •The light profile of stars is known as the PSF: Point Spread Function. •The effect of the seeing is to blur an otherwise sharp image. If in absence of seeing the surface brightness of an object at a position R’ is It(R’), the ...
... •Due to seeing, stars have finite extent (not observed as point sources). •The light profile of stars is known as the PSF: Point Spread Function. •The effect of the seeing is to blur an otherwise sharp image. If in absence of seeing the surface brightness of an object at a position R’ is It(R’), the ...
Life Stages of High
... Planetary Nebulae • Double-shell burning ends with a pulse that ejects the H and He into space as a planetary nebula • The core left behind becomes a white dwarf ...
... Planetary Nebulae • Double-shell burning ends with a pulse that ejects the H and He into space as a planetary nebula • The core left behind becomes a white dwarf ...
stellar spectra instructor notes
... The MK scheme includes the temperature subtypes of the Harvard scheme, with additions to fill out the temperature subclasses detectable at the dispersion (~100 Å/mm) used for MK classification, e.g. B0, B0.5, B1… B9, B9.5, A0, A … etc. The Otype stars were reclassified numerically, the original tem ...
... The MK scheme includes the temperature subtypes of the Harvard scheme, with additions to fill out the temperature subclasses detectable at the dispersion (~100 Å/mm) used for MK classification, e.g. B0, B0.5, B1… B9, B9.5, A0, A … etc. The Otype stars were reclassified numerically, the original tem ...
Astronomy Puzzle-1
... 8. A medieval time astronomer from Gujarat and worked as a head of the department where astronomy studies were conducted in Sanskrit at Ujjain 9. Measured rotational periods of Jupiter and Mars; discovered four satellites of Saturn and the gap in Saturn’s rings. 10. First to confirm Einstein’s predi ...
... 8. A medieval time astronomer from Gujarat and worked as a head of the department where astronomy studies were conducted in Sanskrit at Ujjain 9. Measured rotational periods of Jupiter and Mars; discovered four satellites of Saturn and the gap in Saturn’s rings. 10. First to confirm Einstein’s predi ...
Unit 11: Stellar Evolution
... the neutrinos being radiated away from the core. In a fraction of a second, the earthsized iron core is transformed into a neutron core about 10 miles across. The unsupported outer regions are now free-falling toward the neutron core. The implosion is converted into an explosion by a combination of ...
... the neutrinos being radiated away from the core. In a fraction of a second, the earthsized iron core is transformed into a neutron core about 10 miles across. The unsupported outer regions are now free-falling toward the neutron core. The implosion is converted into an explosion by a combination of ...
Calculating Parallax Lab
... Faster rotating galaxies have greater mass and are brighter Blue supergiants Assume that the brightest star in a galaxy is as bright as the brightest in another ...
... Faster rotating galaxies have greater mass and are brighter Blue supergiants Assume that the brightest star in a galaxy is as bright as the brightest in another ...
Astronomy Astrophysics NGC 7419 as a template for red supergiant clusters &
... Results. We find a distance of 4 ± 0.4 kpc and an age of 14 ± 2 Myr for NGC 7419. The main-sequence turn-off is found at spectral type B1, in excellent agreement. We identify 179 B-type members, implying that there are more than 1200 M in B stars at present. Extrapolating this to lower masses indica ...
... Results. We find a distance of 4 ± 0.4 kpc and an age of 14 ± 2 Myr for NGC 7419. The main-sequence turn-off is found at spectral type B1, in excellent agreement. We identify 179 B-type members, implying that there are more than 1200 M in B stars at present. Extrapolating this to lower masses indica ...
The Halo of the Milky Way
... missions, but no planned mission will measure stars faint enough to unravel the more distant parts of the spheroid, which contain the majority of the spatial substructure. This paper uses data from the Sloan Digital Sky Survey (SDSS) public data release DR3. ...
... missions, but no planned mission will measure stars faint enough to unravel the more distant parts of the spheroid, which contain the majority of the spatial substructure. This paper uses data from the Sloan Digital Sky Survey (SDSS) public data release DR3. ...
... by about ten standard deviations. Are they showing real changes of motion? Allen – This is indeed something to worry about, but I do not believe the discrepancies indicate motion. In the case of ADS 4186E the observations are nearly simultaneous. The last two points refer to measures by Mauray, usin ...
Searching for RR Lyrae Stars in M15
... in the atmosphere of the star. Typically, RRab stars exhibit cooler surface temperatures than RRc stars and are actually more common. While 91 percent of known RR Lyrae stars are of type RRab, only 9 percent are of the type RRc [5]. RRab stars are classified into one group rather than RRa and RRb be ...
... in the atmosphere of the star. Typically, RRab stars exhibit cooler surface temperatures than RRc stars and are actually more common. While 91 percent of known RR Lyrae stars are of type RRab, only 9 percent are of the type RRc [5]. RRab stars are classified into one group rather than RRa and RRb be ...
Nazwy gwiazd nieba północnego o etymologii arabskiej
... 2.12.1 ALPHEKKA (Alpha Coronae Borealis)..........................................................24 2.12.2 NUSAKAN (Beta Coronae Borealis)..............................................................24 2.13 CYGNUS..................................................................................... ...
... 2.12.1 ALPHEKKA (Alpha Coronae Borealis)..........................................................24 2.12.2 NUSAKAN (Beta Coronae Borealis)..............................................................24 2.13 CYGNUS..................................................................................... ...
Publications 2003 - Département d`Astrophysique, Géophysique et
... the Scuti star XX Pyx. Applying a cross-correlation technique to the spectra, we found clear radialvelocity variations with a large amplitude. We derive the orbital parameters and confirm an orbital period of 1.15d, as suggested previously on the basis of photometric variations. The amplitude of the ...
... the Scuti star XX Pyx. Applying a cross-correlation technique to the spectra, we found clear radialvelocity variations with a large amplitude. We derive the orbital parameters and confirm an orbital period of 1.15d, as suggested previously on the basis of photometric variations. The amplitude of the ...
The Physical Properties of Normal A Stars
... Spectral classification was designed for Pop I single stars. For SB2 stars, it is desirable to deconvolve the spectra before classification. Further Pop II A stars as metal-poor evolved stars are also peculiar. Most are horizontal-branch stars, e.g., FHB B and A and RR Lyrae stars. Main sequence ban ...
... Spectral classification was designed for Pop I single stars. For SB2 stars, it is desirable to deconvolve the spectra before classification. Further Pop II A stars as metal-poor evolved stars are also peculiar. Most are horizontal-branch stars, e.g., FHB B and A and RR Lyrae stars. Main sequence ban ...
ASTRO-114--Lecture 38-
... and look up at the stars. And after a little practice, they could pick a star and tell what its magnitude was. Because you only had six numbers to choose from and usually you could tell whether it was first, ‘cause they were very bright, or whether it was sixth, because you could hardly see them, an ...
... and look up at the stars. And after a little practice, they could pick a star and tell what its magnitude was. Because you only had six numbers to choose from and usually you could tell whether it was first, ‘cause they were very bright, or whether it was sixth, because you could hardly see them, an ...
Perseus (constellation)
Perseus, named after the Greek mythological hero Perseus, is a constellation in the northern sky. It was one of 48 listed by the 2nd-century astronomer Ptolemy and among the 88 modern constellations defined by the International Astronomical Union (IAU). It is located in the northern celestial hemisphere near several other constellations named after legends surrounding Perseus, including Andromeda to the west and Cassiopeia to the north. Perseus is also bordered by Aries and Taurus to the south, Auriga to the east, Camelopardalis to the north, and Triangulum to the west.The galactic plane of the Milky Way passes through Perseus but is mostly obscured by molecular clouds. The constellation's brightest star is the yellow-white supergiant Alpha Persei (also called Mirfak), which shines at 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 intrinsically variable star, it is an eclipsing binary. Other notable star systems in Perseus include X Persei, a binary system containing a neutron star, and GK Persei, a nova that peaked at magnitude 0.2 in 1901. The Double Cluster, comprising two open clusters quite near each other in the sky, was known to the ancient Chinese. The constellation gives its name to the Perseus Cluster (Abell 426), a massive galaxy cluster located 250 million light-years from Earth. It hosts the radiant of the annual Perseids meteor shower—one of the most prominent meteor showers in the sky.