Colour-magnitude diagrams of the post
... can be considered a member. Goranskii determined a period of 0.5752 days, so that the cluster can be tentatively classified as Oosterhoff type I. 5. Conclusions Cluster parameters based on CCD photometry were derived for NGC 6256 and NGC 6717. They are both located in the bulge, but are not metal-ri ...
... can be considered a member. Goranskii determined a period of 0.5752 days, so that the cluster can be tentatively classified as Oosterhoff type I. 5. Conclusions Cluster parameters based on CCD photometry were derived for NGC 6256 and NGC 6717. They are both located in the bulge, but are not metal-ri ...
constellations - Richmond and Glen Allen Weather
... the time of the year when the constellation culminates at 9 P.M. Eastern Standard Time or 10 P.M. Eastern Daylight Saving Time. (The time when most people generally observe the sky.) Every constellation culminates once a day, but it may be during the daylight hours and therefore not visible, or at a ...
... the time of the year when the constellation culminates at 9 P.M. Eastern Standard Time or 10 P.M. Eastern Daylight Saving Time. (The time when most people generally observe the sky.) Every constellation culminates once a day, but it may be during the daylight hours and therefore not visible, or at a ...
Abd al-Rahman al-Sufi and his book of the fixed stars: a journey of
... important books in the history of Arabic and Islamic astronomy. This book was called Șuwar al-Kawākib al-Thamāniyah wa-al-Ārba'een, later known by its short name The Book of the Fixed Stars. It was written in Arabic by the famous Persian author and astronomer ′Abd alRaḥmān al-Ṣūfī around A.D. 964. E ...
... important books in the history of Arabic and Islamic astronomy. This book was called Șuwar al-Kawākib al-Thamāniyah wa-al-Ārba'een, later known by its short name The Book of the Fixed Stars. It was written in Arabic by the famous Persian author and astronomer ′Abd alRaḥmān al-Ṣūfī around A.D. 964. E ...
Brightest Stars : Discovering the Universe Through the Sky`s Most
... under skies significantly degraded by human-made light pollution. In such a world, it is the brightest stars that everybody can see, even people who have only their unaided eyes to use. Are all the major kinds of stars represented by the twenty-one brightest, the stars of the so-called 1st magnitude ...
... under skies significantly degraded by human-made light pollution. In such a world, it is the brightest stars that everybody can see, even people who have only their unaided eyes to use. Are all the major kinds of stars represented by the twenty-one brightest, the stars of the so-called 1st magnitude ...
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 ...
On the nature of sn stars. I. A detailed abundance study
... (HD 21071 and HD 22136) shows no strong C IV absorption in the spectra (Shore 1986; Shore et al. 1987). However, it is possible that these stars are C IV variable, similar to other He-weak stars, and a single observation corresponds to their weak line phase (Shore 1986). More recently, Shore et al. ...
... (HD 21071 and HD 22136) shows no strong C IV absorption in the spectra (Shore 1986; Shore et al. 1987). However, it is possible that these stars are C IV variable, similar to other He-weak stars, and a single observation corresponds to their weak line phase (Shore 1986). More recently, Shore et al. ...
HH 222: A Giant Herbig-Haro Flow from the
... HH 222 is a giant shocked region in the L1641 cloud, and is popularly known as the Orion Streamers or ”the waterfall” on account of its unusual structure. At the center of these streamers are two infrared sources coincident with a nonthermal radio jet aligned along the principal streamer. The unique ...
... HH 222 is a giant shocked region in the L1641 cloud, and is popularly known as the Orion Streamers or ”the waterfall” on account of its unusual structure. At the center of these streamers are two infrared sources coincident with a nonthermal radio jet aligned along the principal streamer. The unique ...
Binarity in carbon-enhanced metal-poor stars
... a lot of nitrogen, a signature that not all CEMP-no stars share (see for instance, Ito et al. 2013; Norris et al. 2013b). It has also been suggested that in very low metallicity AGB stars with very high neutron-to-Fe-peak-element seed ratios, the s-process runs to completion and a large overabundanc ...
... a lot of nitrogen, a signature that not all CEMP-no stars share (see for instance, Ito et al. 2013; Norris et al. 2013b). It has also been suggested that in very low metallicity AGB stars with very high neutron-to-Fe-peak-element seed ratios, the s-process runs to completion and a large overabundanc ...
Hot Horizontal Branch Stars in the Galactic Bulge. I
... straggler) members, the cluster harbors four or five sdB/O stars (Liebert, Saffer, & Green 1994) whose membership is likely given their spatial concentration towards the cluster center (Kaluzny & Udalski 1992). Hot, metal-rich BHB stars also appear to be present in metal-rich extragalactic systems. ...
... straggler) members, the cluster harbors four or five sdB/O stars (Liebert, Saffer, & Green 1994) whose membership is likely given their spatial concentration towards the cluster center (Kaluzny & Udalski 1992). Hot, metal-rich BHB stars also appear to be present in metal-rich extragalactic systems. ...
Stars & Galaxies - newmanlib.ibri.org
... Different Kinds of Stars • Even a brief glance at the stars shows us that they differ in brightness. • As one looks at the stars more carefully, it becomes apparent that they are not all the ...
... Different Kinds of Stars • Even a brief glance at the stars shows us that they differ in brightness. • As one looks at the stars more carefully, it becomes apparent that they are not all the ...
Navigating the Night Sky Checklist
... that a star will travel a distance in the sky equivalent to the apparent width of the moon in about 2 minutes. (Stars don't "overtake and pass" the moon, since the moon is moving too. You need to compare to a stationary object like a chimney to see this motion.) 2. Suppose Jupiter has just risen, bu ...
... that a star will travel a distance in the sky equivalent to the apparent width of the moon in about 2 minutes. (Stars don't "overtake and pass" the moon, since the moon is moving too. You need to compare to a stationary object like a chimney to see this motion.) 2. Suppose Jupiter has just risen, bu ...
Properties of Wolf-Rayet Stars - Paul Crowther, University of Sheffield
... properties between O supergiants and WN subtypes. Gamov (1943) first suggested that the anomalous composition of WR stars was the result of nuclear processed material being visible on their surfaces, although this was not universally accepted until the final decade of the 20th Century (Lamers et al. ...
... properties between O supergiants and WN subtypes. Gamov (1943) first suggested that the anomalous composition of WR stars was the result of nuclear processed material being visible on their surfaces, although this was not universally accepted until the final decade of the 20th Century (Lamers et al. ...
Astronomy Astrophysics NGC 7419 as a template for red supergiant clusters &
... 2007; Clark et al. 2009a). These clusters are so heavily obscured that their population of intrinsically blue stars have not been found yet, and only the RSGs have been observed as bright sources in the near-infrared. Population synthesis models indicate that, given the rarity of RSGs, the clusters ...
... 2007; Clark et al. 2009a). These clusters are so heavily obscured that their population of intrinsically blue stars have not been found yet, and only the RSGs have been observed as bright sources in the near-infrared. Population synthesis models indicate that, given the rarity of RSGs, the clusters ...
CONSTELLATION PERSEUS The constellation
... and thirsty. A fisherman, Dictys, broke the chest open and found the mother and child. Dictys brought up Perseus as his own son. The brother of Dictys was King Polydectes, who coveted Danaë as a wife. But Danaë was reluctant and Perseus, now grown to manhood, defended her from the king’s advances. B ...
... and thirsty. A fisherman, Dictys, broke the chest open and found the mother and child. Dictys brought up Perseus as his own son. The brother of Dictys was King Polydectes, who coveted Danaë as a wife. But Danaë was reluctant and Perseus, now grown to manhood, defended her from the king’s advances. B ...
X-Ray Properties of Young Stars and Stellar Clusters
... Class I protostar YLW 16A in the dense core of the ρ Ophiuchi cloud showed a remarkable morphology with two rise phases and similar temperature structure (Fig. 2) (Imanishi et al., 2001). Other flares seen with COUP show roughly symmetrical rise and fall morphologies, sometimes extending over 1–2 da ...
... Class I protostar YLW 16A in the dense core of the ρ Ophiuchi cloud showed a remarkable morphology with two rise phases and similar temperature structure (Fig. 2) (Imanishi et al., 2001). Other flares seen with COUP show roughly symmetrical rise and fall morphologies, sometimes extending over 1–2 da ...
Planetary Nebula
... It’s the dim star, not the bright one, near the center of NGC 3132 that created this odd but beautiful planetary nebula. The pool of light seen surrounding this binary system is energized by the hot surface of the faint star. Blue represents the hottest gas, which is confined to the inner region of ...
... It’s the dim star, not the bright one, near the center of NGC 3132 that created this odd but beautiful planetary nebula. The pool of light seen surrounding this binary system is energized by the hot surface of the faint star. Blue represents the hottest gas, which is confined to the inner region of ...
Rotation Periods of Wide Binaries in the Kepler Field
... these clusters are relatively distant, so cluster stars later than early K spectral type are too faint for Kepler. Angus, et al. (2015) used rotation periods of Kepler stars as well as cluster stars and other stars with known ages to derive a period-age-color relation of the form P = aAn (B − V − c) ...
... these clusters are relatively distant, so cluster stars later than early K spectral type are too faint for Kepler. Angus, et al. (2015) used rotation periods of Kepler stars as well as cluster stars and other stars with known ages to derive a period-age-color relation of the form P = aAn (B − V − c) ...
on the pms star hbc 498 and its associated nebulous stars1
... Assigned assuming luminosity class V. b Has an emission reversal in c d its core. Variable, see Fig. 2 and text for details. Spectrogram with low S/N ratio ≤ 9 at 6400 Å. ...
... Assigned assuming luminosity class V. b Has an emission reversal in c d its core. Variable, see Fig. 2 and text for details. Spectrogram with low S/N ratio ≤ 9 at 6400 Å. ...
Do We Know of Any Maunder Minimum Stars?
... activity level of the sun during the Maunder Minimum corresponded to that of these low-activity stars, S = 0.1451. Zhang et al. (1994) applied this value to an analysis of the effects of stellar activity on brightness and concluded that the Sun was 0.2 − 0.6% dimmer during the Maunder Minimum. Howev ...
... activity level of the sun during the Maunder Minimum corresponded to that of these low-activity stars, S = 0.1451. Zhang et al. (1994) applied this value to an analysis of the effects of stellar activity on brightness and concluded that the Sun was 0.2 − 0.6% dimmer during the Maunder Minimum. Howev ...
File
... Pegasus the winged horse, is a constellation that appears in the south when its autumn for the northern latitudes. The geometrical figure is called “ The great square of Pegasus”. To the observers on earth, the winged horse Pegasus appears to be flying upside down. The vernal equinox, the sun’s loca ...
... Pegasus the winged horse, is a constellation that appears in the south when its autumn for the northern latitudes. The geometrical figure is called “ The great square of Pegasus”. To the observers on earth, the winged horse Pegasus appears to be flying upside down. The vernal equinox, the sun’s loca ...
Metal-poor Stars
... The first stars that formed from the pristine gas left after the Big Bang were very massive (Bromm et al. 2002). After a very short life time these co-called Population III stars exploded as supernovae, which then provided the first metals to the interstellar medium. All subsequent generations of st ...
... The first stars that formed from the pristine gas left after the Big Bang were very massive (Bromm et al. 2002). After a very short life time these co-called Population III stars exploded as supernovae, which then provided the first metals to the interstellar medium. All subsequent generations of st ...
What To See Telescope(Jul-Sept) v1 - One
... Your telescope may have come with at least two eyepieces, and you may have acquired one or two more. It’s important to know the magnification each of your eyepieces give you, and if possible, the field of view of each eyepiece in degrees. If you do not know how to determine these numbers, look to th ...
... Your telescope may have come with at least two eyepieces, and you may have acquired one or two more. It’s important to know the magnification each of your eyepieces give you, and if possible, the field of view of each eyepiece in degrees. If you do not know how to determine these numbers, look to th ...
Planetary Nebulae: Observational Properties, Mimics, and Diagnostics
... Abstract: The total number of true, likely and possible planetary nebulae (PN) now known in the Milky Way is nearly 3000, double the number known a decade ago. The new discoveries are a legacy of the recent availability of wide field, narrowband imaging surveys, primarily in the light of H-alpha. In ...
... Abstract: The total number of true, likely and possible planetary nebulae (PN) now known in the Milky Way is nearly 3000, double the number known a decade ago. The new discoveries are a legacy of the recent availability of wide field, narrowband imaging surveys, primarily in the light of H-alpha. In ...
Stargazing For Beginners: A Binocular Tour of the Southern Night Sky
... you’re rusty with Greek, a summary of the letters is found on the next page. In some cases, either because of error or otherwise, the stars do not always follow the order of brightness. Castor is the brightest star in Gemini, for example, yet it’s labeled β (Beta) Geminorum. It’s a little confusing ...
... you’re rusty with Greek, a summary of the letters is found on the next page. In some cases, either because of error or otherwise, the stars do not always follow the order of brightness. Castor is the brightest star in Gemini, for example, yet it’s labeled β (Beta) Geminorum. It’s a little confusing ...
Orion (constellation)
Orion is a prominent constellation located on the celestial equator and visible throughout the world. It is one of the most conspicuous and recognizable constellations in the night sky. It was named after Orion, a hunter in Greek mythology. Its brightest stars are Rigel (Beta Orionis) and Betelgeuse (Alpha Orionis), a blue-white and a red supergiant, respectively.