Document
... For Gaia, the assembly of this gigantic picture is a complex process that needs to be performed over a number of years in order to reach the expected measurement goal of 20 microarcsecond accuracy for a magnitude 15 star. (A magnitude 15 star is about 4 million times fainter than Sirius, the brighte ...
... For Gaia, the assembly of this gigantic picture is a complex process that needs to be performed over a number of years in order to reach the expected measurement goal of 20 microarcsecond accuracy for a magnitude 15 star. (A magnitude 15 star is about 4 million times fainter than Sirius, the brighte ...
Astronomy 113 Laboratory Manual - UW
... linked to religion and myth. In Western cultures the constellations typically derive from Greek and Roman mythology, such as Aries, Leo, Andromeda, Orion, Hercules and Gemini. These patterns gave an organization to the sky that was essential for its study. Indeed, some people believe that many myths ...
... linked to religion and myth. In Western cultures the constellations typically derive from Greek and Roman mythology, such as Aries, Leo, Andromeda, Orion, Hercules and Gemini. These patterns gave an organization to the sky that was essential for its study. Indeed, some people believe that many myths ...
A New Science Strategy for Space Astronomy and Astrophysics
... next decade,1 prepared by a committee under the leadership of John Bahcall. Like previous decadal studies in this field, the report identified in priority order the most important scientific programs and projects for both groundand space-based research. It recommended a single large initiative for s ...
... next decade,1 prepared by a committee under the leadership of John Bahcall. Like previous decadal studies in this field, the report identified in priority order the most important scientific programs and projects for both groundand space-based research. It recommended a single large initiative for s ...
preprint, pdf version - LESIA
... events observed in Brazil and Chile (4 June 2011) and in Hawaii (23 June 2011). These last two events, as in 22 June 2008, were double events in which Charon and Pluto occulted the same star. In the 4 June 2011 event in particular, both occultations could be recorded at each site. The population of ...
... events observed in Brazil and Chile (4 June 2011) and in Hawaii (23 June 2011). These last two events, as in 22 June 2008, were double events in which Charon and Pluto occulted the same star. In the 4 June 2011 event in particular, both occultations could be recorded at each site. The population of ...
Stellar evolution - Statistical Physics Group
... we receive. They are (i) apparent luminosity and (ii) spectral distribution of light. Both of these observations will be incomplete as they can only refer to the limited wavelength range accessible to observation ; however, observations from rockets and satellites will gradually fill in some of the ...
... we receive. They are (i) apparent luminosity and (ii) spectral distribution of light. Both of these observations will be incomplete as they can only refer to the limited wavelength range accessible to observation ; however, observations from rockets and satellites will gradually fill in some of the ...
on the pms star hbc 498 and its associated nebulous stars1
... out because of their associated reflection nebulosities (Dorchner & Gürtler 1963; van den Bergh 1966; Bernes 1977); Gyulbudaghian, Glushov, & Denisyuk 1978) and because they apparently constitute a tight trapezium of young stellar objects (Cohen 1980; Cohen & Kuhi 1979) associated with a small dark ...
... out because of their associated reflection nebulosities (Dorchner & Gürtler 1963; van den Bergh 1966; Bernes 1977); Gyulbudaghian, Glushov, & Denisyuk 1978) and because they apparently constitute a tight trapezium of young stellar objects (Cohen 1980; Cohen & Kuhi 1979) associated with a small dark ...
Silicon isotopic abundance toward evolved stars and its application
... Vollmer et al. 2008), indicating that the amount of Si isotopes locked in the SiC grains and the SiO group in silicates may be similar; an example are the Orgueil silicate grains shown in Fig. 3. Most of the presolar grains have 29 Si/30 Si ratios around 1.5, but evidence of lower 29 Si/30 Si ratios ...
... Vollmer et al. 2008), indicating that the amount of Si isotopes locked in the SiC grains and the SiO group in silicates may be similar; an example are the Orgueil silicate grains shown in Fig. 3. Most of the presolar grains have 29 Si/30 Si ratios around 1.5, but evidence of lower 29 Si/30 Si ratios ...
Sample pages 1 PDF
... wintertime sky also contains some of the most spectacular deep sky objects, of which the Orion Nebula and the Pleiades are the best known. It shouldn’t be overlooked that this is also the time of year when people give each other gifts. Quite a few budding astronomers will be testing out their first ...
... wintertime sky also contains some of the most spectacular deep sky objects, of which the Orion Nebula and the Pleiades are the best known. It shouldn’t be overlooked that this is also the time of year when people give each other gifts. Quite a few budding astronomers will be testing out their first ...
The Evolution of Isotope Ratios in the Milky Way Galaxy
... Isotope ratios of elemental abundances can provide more constraints not only on galaxy formation and evolution, but also on the detailed physics of Asymptotic Giant Branch (AGB) stars and supernovae. The isotopic ratios of C, N, O, and Si have been measured in ancient meteorites and provide informat ...
... Isotope ratios of elemental abundances can provide more constraints not only on galaxy formation and evolution, but also on the detailed physics of Asymptotic Giant Branch (AGB) stars and supernovae. The isotopic ratios of C, N, O, and Si have been measured in ancient meteorites and provide informat ...
the entire issue as one large (23
... Birr Castle, Ireland, had discerned a spiral structure in a number of them, most famously in the ‘Whirlpool Nebula’ in Canes Venatici, but also in eighty or so others. Faint and small spirals were later found by the thousands in deep plates taken by James Keeler with the 36-inch Crossley Reflector a ...
... Birr Castle, Ireland, had discerned a spiral structure in a number of them, most famously in the ‘Whirlpool Nebula’ in Canes Venatici, but also in eighty or so others. Faint and small spirals were later found by the thousands in deep plates taken by James Keeler with the 36-inch Crossley Reflector a ...
FIRST STELLAR ABUNDANCES IN THE DWARF IRREGULAR
... The analysis of bright nebular emission lines of H II regions has been the most frequent approach to modeling chemical evolution of more distant galaxies to date (Matteucci & Tosi 1985). So far, only a very limited number of elements can be examined and quantified when using this approach. The chemi ...
... The analysis of bright nebular emission lines of H II regions has been the most frequent approach to modeling chemical evolution of more distant galaxies to date (Matteucci & Tosi 1985). So far, only a very limited number of elements can be examined and quantified when using this approach. The chemi ...
Astronomy Astrophysics - Niels Bohr Institutet
... effort has been devoted to the fundamental issue of determining reliable isochrone ages for as many stars as possible, and we believe that a rather more realistic assessment of the errors of such ages has been obtained. Finally, we have computed individual Galactic orbits for all stars with adequate ...
... effort has been devoted to the fundamental issue of determining reliable isochrone ages for as many stars as possible, and we believe that a rather more realistic assessment of the errors of such ages has been obtained. Finally, we have computed individual Galactic orbits for all stars with adequate ...
Chemical analysis of 24 dusty (pre-) main
... (Canary Islands, Spain). The second observational run, concerning mostly southern-hemisphere objects, was performed by dr. Gwendolyn Meeus from January 26 till January 28, 1999 at the ESO site La Silla (Chile). These data were collected using the 1.5m telescope and the FEROS instrument. The waveleng ...
... (Canary Islands, Spain). The second observational run, concerning mostly southern-hemisphere objects, was performed by dr. Gwendolyn Meeus from January 26 till January 28, 1999 at the ESO site La Silla (Chile). These data were collected using the 1.5m telescope and the FEROS instrument. The waveleng ...
A Spitzer mid-infrared spectral survey of mass
... shown is a representative sample of the much more numerous field stars without thick dust shells. The most numerous stars in any stellar population are low-mass stars. In Fig. 1(a), these stars evolve up the AGB in M K at J − K < 2.5 and M K > −9, before they develop high mass-loss rates and thick d ...
... shown is a representative sample of the much more numerous field stars without thick dust shells. The most numerous stars in any stellar population are low-mass stars. In Fig. 1(a), these stars evolve up the AGB in M K at J − K < 2.5 and M K > −9, before they develop high mass-loss rates and thick d ...
The Life and Work of Edward Emerson Barnard
... final passage through the ring-plane on January 7,1908. On January 2, he got up from his sick bed long enough to note that the ring was still visible in the 40-inch telescope, though 'very thin' and with a satellite at each end. 'Without occultation it was almost impossible to see any trace of the r ...
... final passage through the ring-plane on January 7,1908. On January 2, he got up from his sick bed long enough to note that the ring was still visible in the 40-inch telescope, though 'very thin' and with a satellite at each end. 'Without occultation it was almost impossible to see any trace of the r ...
Classification of Variable Stars
... exhausted. (i.e. V746 Oph is the 746th variable to be discovered in Ophiuchus.) Variable star names are determined by a committee appointed by the International Astronomical Union (I.A.U.). The assignments are made in the order in which the variable stars were discovered in a constellation. If one o ...
... exhausted. (i.e. V746 Oph is the 746th variable to be discovered in Ophiuchus.) Variable star names are determined by a committee appointed by the International Astronomical Union (I.A.U.). The assignments are made in the order in which the variable stars were discovered in a constellation. If one o ...
Astronomy
... size and distance of the Moon and invented the earliest known astronomical devices such as the astrolabe.[12] Hipparchus also created a comprehensive catalog of 1020 stars, and most of the constellations of the northern hemisphere derive are taken from Greek astronomy.[13] The Antikythera mechanism ...
... size and distance of the Moon and invented the earliest known astronomical devices such as the astrolabe.[12] Hipparchus also created a comprehensive catalog of 1020 stars, and most of the constellations of the northern hemisphere derive are taken from Greek astronomy.[13] The Antikythera mechanism ...
solon irving bailey - National Academy of Sciences
... elevated station might be maintained. Thus the problem was solved by the construction of a mule-path to the summit. A vivid description of this project is given in Harvard Annals 39, the first volume of the Peruvian Meteorology. After Professor Bailey and his party had passed eight consecutive days ...
... elevated station might be maintained. Thus the problem was solved by the construction of a mule-path to the summit. A vivid description of this project is given in Harvard Annals 39, the first volume of the Peruvian Meteorology. After Professor Bailey and his party had passed eight consecutive days ...
Spectral Matching for Elemental Abundances of Evolved Stars of Globular Clusters
... oxygen-rich or oxygen-poor. From this a catalogue of abundances of iron, carbon and barium of 848 giant branch stars were determined, of which 557 also had well-defined nitrogen abundances. k-means clustering analysis was used to group the stars in ω Cen into four homogeneous groups based upon these ...
... oxygen-rich or oxygen-poor. From this a catalogue of abundances of iron, carbon and barium of 848 giant branch stars were determined, of which 557 also had well-defined nitrogen abundances. k-means clustering analysis was used to group the stars in ω Cen into four homogeneous groups based upon these ...
exploring anticorrelations and light element variations
... literature. Targets were selected as cluster members if (1) there is published abundance information on the star as a cluster member, (2) the star is a radial velocity member, or (3) if it has a probability >50% of being a cluster member based on their proper motion adopted from the literature. Afte ...
... literature. Targets were selected as cluster members if (1) there is published abundance information on the star as a cluster member, (2) the star is a radial velocity member, or (3) if it has a probability >50% of being a cluster member based on their proper motion adopted from the literature. Afte ...
Luminosities and mass-loss rates of SMC and LMC AGB stars and
... SMC 155; Kraemer et al. 2005), O/Be-stars, and objects showing PAH emission1 . The remaining sample includes the very interesting object WOH G 64, even though Ohnaka et al. (2008) have recently demonstrated with interferometric observations that the mid-IR visibility curves and the SED can be better ...
... SMC 155; Kraemer et al. 2005), O/Be-stars, and objects showing PAH emission1 . The remaining sample includes the very interesting object WOH G 64, even though Ohnaka et al. (2008) have recently demonstrated with interferometric observations that the mid-IR visibility curves and the SED can be better ...
Chapter 12
... hydrogen and helium and have about the same mass. A small percentage, however, are as massive as 30 times the Sun’s mass (30 M) and are much hotter than the Sun and blue in color. Others are much less massive than the Sun, only one-tenth its mass, and are cool, red, and dim. Moreover, even stars si ...
... hydrogen and helium and have about the same mass. A small percentage, however, are as massive as 30 times the Sun’s mass (30 M) and are much hotter than the Sun and blue in color. Others are much less massive than the Sun, only one-tenth its mass, and are cool, red, and dim. Moreover, even stars si ...
Barium and europium abundances in cool dwarf stars and
... halo stars are of the r-process origin. Much observational efforts were invested in testing this idea. For extremely metalpoor stars with metallicities [Fe/H] ≤ −2.4 McWilliam (1998) has derived an average [Eu/Ba] = 0.69, consistent with pure rprocess nucleosynthesis provided that the data of Arland ...
... halo stars are of the r-process origin. Much observational efforts were invested in testing this idea. For extremely metalpoor stars with metallicities [Fe/H] ≤ −2.4 McWilliam (1998) has derived an average [Eu/Ba] = 0.69, consistent with pure rprocess nucleosynthesis provided that the data of Arland ...
ASTRONOMY AND ASTROPHYSICS Barium and europium
... halo stars are of the r-process origin. Much observational efforts were invested in testing this idea. For extremely metalpoor stars with metallicities [Fe/H] ≤ −2.4 McWilliam (1998) has derived an average [Eu/Ba] = 0.69, consistent with pure rprocess nucleosynthesis provided that the data of Arland ...
... halo stars are of the r-process origin. Much observational efforts were invested in testing this idea. For extremely metalpoor stars with metallicities [Fe/H] ≤ −2.4 McWilliam (1998) has derived an average [Eu/Ba] = 0.69, consistent with pure rprocess nucleosynthesis provided that the data of Arland ...
Constellation
In modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union (IAU). These areas had their origins in Western-traditional asterisms from which the constellations take their names. There are 88 officially recognized constellations, covering the entire sky.Thus, any given point in a celestial coordinate system can unambiguously be assigned to a constellation. It is usual in astronomy to give the constellation in which a given object is found along with its coordinates in order to convey a rough idea in which part of the sky it is located. For example, saying the Horsehead Nebula is near Orion's Belt in the constellation Orion immediately locates it just south of the ecliptic and conveys that it is best observable in winter from the Northern Hemisphere.