Rotation Periods and Relative Ages of Solar-Type Stars
... concerning the relationship between a star’s age and its rotation period. To begin, smaller intrinsic spread in Prot is characteristic of older LMS stars, but not young ones. This observation is apparent in Figures 3 and 4. The residuals of Pcalc - Prot are plotted against B - V in Figure 3. A conce ...
... concerning the relationship between a star’s age and its rotation period. To begin, smaller intrinsic spread in Prot is characteristic of older LMS stars, but not young ones. This observation is apparent in Figures 3 and 4. The residuals of Pcalc - Prot are plotted against B - V in Figure 3. A conce ...
WORD - Astrophysics
... A very large optical-infrared telescope will allow us to derive the important processes of galaxy formation and evolution in the full range of environments. Several complementary lines of attack are possible, directly connecting present-day Universe with the high redshift Universe, where the old sta ...
... A very large optical-infrared telescope will allow us to derive the important processes of galaxy formation and evolution in the full range of environments. Several complementary lines of attack are possible, directly connecting present-day Universe with the high redshift Universe, where the old sta ...
PDF only - at www.arxiv.org.
... den Bos. In this case the Kepler’s constant C plays an important role. Changes in the value of C will lead to a fairly significant error in determining the orbital elements. Therefore Kepler’s constant C must be determined accurately before deriving orbital elements. ...
... den Bos. In this case the Kepler’s constant C plays an important role. Changes in the value of C will lead to a fairly significant error in determining the orbital elements. Therefore Kepler’s constant C must be determined accurately before deriving orbital elements. ...
Astronomy Astrophysics First detection of the field star overdensity in the Perseus... &
... a uvbyHβ Strömgren photometric survey covering 16◦2 in the anticenter direction using the Wide Field Camera at the Isaac Newton Telescope (INT, La Palma). This is the natural photometric system for identifying young stars and obtaining accurate estimates of individual distances and ages. The survey ...
... a uvbyHβ Strömgren photometric survey covering 16◦2 in the anticenter direction using the Wide Field Camera at the Isaac Newton Telescope (INT, La Palma). This is the natural photometric system for identifying young stars and obtaining accurate estimates of individual distances and ages. The survey ...
GALEX and Star Formation
... massive stars, hot, luminous, and short-lived, are the unambiguous tracers of star formation. They are luminous enough that they can be seen in distant galaxies. They evolve on fast timescales (.10 Myrs for Otype stars), therefore they also trace the original spatial structure of the star-formation ...
... massive stars, hot, luminous, and short-lived, are the unambiguous tracers of star formation. They are luminous enough that they can be seen in distant galaxies. They evolve on fast timescales (.10 Myrs for Otype stars), therefore they also trace the original spatial structure of the star-formation ...
Chemical abundances and winds of massive stars in M31: a Btype
... The published photometry of both stars (from Massey et al. 1986) is provided in Table 1. Assuming ðB 2 VÞ0 ¼ 20:26 for a B0 Ia atmosphere (Deutschman, Davis & Schild 1976), we estimate an interstellar reddening of EðB 2 VÞ ¼ 0:18 mag towards OB 10-64. Massey et al. (1995) have estimated the mean red ...
... The published photometry of both stars (from Massey et al. 1986) is provided in Table 1. Assuming ðB 2 VÞ0 ¼ 20:26 for a B0 Ia atmosphere (Deutschman, Davis & Schild 1976), we estimate an interstellar reddening of EðB 2 VÞ ¼ 0:18 mag towards OB 10-64. Massey et al. (1995) have estimated the mean red ...
FIELD ASTRONOMY
... related to specific time. Therefore, accurate time becomes a highly significant consideration in astro survey operations. ...
... related to specific time. Therefore, accurate time becomes a highly significant consideration in astro survey operations. ...
The Evolution of Isotope Ratios in the Milky Way Galaxy
... Cottrell & Da Costa 1981; Renzini 2008), even if quantitative problems with the models exist (e.g., Fenner et al. 2004). Overall a large fraction of light elements such as C, N and F are produced by AGB stars, while the contribution toward heavier elements (from Na to Fe) is negligible, except perha ...
... Cottrell & Da Costa 1981; Renzini 2008), even if quantitative problems with the models exist (e.g., Fenner et al. 2004). Overall a large fraction of light elements such as C, N and F are produced by AGB stars, while the contribution toward heavier elements (from Na to Fe) is negligible, except perha ...
April 2016 - Central Arkansas Astronomical Society
... composed of a pulsar in orbit around a neutron star. Taylor Louisiana, and Hanford, Washington, USA. The LIGO and Joel M. Weisberg in 1982 found that the orbit of the Observatories are funded by the Na onal Science pulsar was slowly shrinking over me because of the release Founda on (NSF), and were ...
... composed of a pulsar in orbit around a neutron star. Taylor Louisiana, and Hanford, Washington, USA. The LIGO and Joel M. Weisberg in 1982 found that the orbit of the Observatories are funded by the Na onal Science pulsar was slowly shrinking over me because of the release Founda on (NSF), and were ...
Paper by Bessell, Castelli and Plez on Model atmospheres
... more useful temperature sensitive color for A-K stars but unfortunately is not available for all the calibrating stars. However, precise b-y values are available for many stars, particularly the brighter ones and b-y can be converted into V-I very accurately for Pop I A-G stars. We have therefore ob ...
... more useful temperature sensitive color for A-K stars but unfortunately is not available for all the calibrating stars. However, precise b-y values are available for many stars, particularly the brighter ones and b-y can be converted into V-I very accurately for Pop I A-G stars. We have therefore ob ...
High ions towards white dwarfs: circumstellar line shifts and stellar
... of three local DA white dwarfs using the Cosmic Origins Spectrograph on the HST (Osterman et al. 2011). By combining these data with archival spectra gained with the FUSE satellite, and by carefully comparing the velocity shifts derived from a consistent set of low and high UV ion profiles recorded ...
... of three local DA white dwarfs using the Cosmic Origins Spectrograph on the HST (Osterman et al. 2011). By combining these data with archival spectra gained with the FUSE satellite, and by carefully comparing the velocity shifts derived from a consistent set of low and high UV ion profiles recorded ...
Giuseppe Piazzi and the Discovery of Ceres
... Oriani favours its planetary nature.” It is evident at this point that Piazzi decided to write to Bode, who was known for helping to create the Titius-Bode law, just to probe his reaction. Unfortunately for Piazzi, the letters reached Bode on March 20 and Oriani on April 5. On February 27, Lalande, ...
... Oriani favours its planetary nature.” It is evident at this point that Piazzi decided to write to Bode, who was known for helping to create the Titius-Bode law, just to probe his reaction. Unfortunately for Piazzi, the letters reached Bode on March 20 and Oriani on April 5. On February 27, Lalande, ...
Using the Heavens to Know Time to Using Time to Know the Heavens
... Early escapement clocks of the Middle Ages can lost or gain up to an hour a day and have to be reset daily with sundials. Around 1670, the pendulum clocks based on the design of Christiaan Huygens brought the error of ordinary clock down to fifteen seconds a day. Man began to have the concept of min ...
... Early escapement clocks of the Middle Ages can lost or gain up to an hour a day and have to be reset daily with sundials. Around 1670, the pendulum clocks based on the design of Christiaan Huygens brought the error of ordinary clock down to fifteen seconds a day. Man began to have the concept of min ...
Baryons at Low Densities: The Stellar Halos around Galaxies
... was largely built from one, or a few, relatively massive (> 109 MA) accretion events, but at large radii many low-mass accretions have contributed to the recent buildup of the halo. The kinematics of the inner halo stars is however consistent with their origin from the disc — these stars were likely ...
... was largely built from one, or a few, relatively massive (> 109 MA) accretion events, but at large radii many low-mass accretions have contributed to the recent buildup of the halo. The kinematics of the inner halo stars is however consistent with their origin from the disc — these stars were likely ...
Starting Out in Astronomy Observing the Moon Darkness Over Africa
... article tells you how to do just that. First Mistakes Most people, at some time in their lives, look up at the night sky. Some are awe-struck, others mildly interested, and still others are not even aware that they have looked up in the first place, and consequently go about their lives oblivious to ...
... article tells you how to do just that. First Mistakes Most people, at some time in their lives, look up at the night sky. Some are awe-struck, others mildly interested, and still others are not even aware that they have looked up in the first place, and consequently go about their lives oblivious to ...
ASI 2017 Abstract Book - Astronomical Society of India
... One of the most outstanding challenges in extragalactic astronomy is to identify the astrophysical processes responsible for transforming simple dark matter haloes into the heterogenous population of galaxies inhabiting today's Universe. How did different morphological types form and evolve? Does th ...
... One of the most outstanding challenges in extragalactic astronomy is to identify the astrophysical processes responsible for transforming simple dark matter haloes into the heterogenous population of galaxies inhabiting today's Universe. How did different morphological types form and evolve? Does th ...
Hands-On Activities
... member of a distinct region called the Kuiper belt pulsar: Exceptionally small and very dense star (about double the sun’s mass but only a few miles in radius) that is spinning at very high speed. This spinning star emits energy that is seen as pulses as the star rotates. ...
... member of a distinct region called the Kuiper belt pulsar: Exceptionally small and very dense star (about double the sun’s mass but only a few miles in radius) that is spinning at very high speed. This spinning star emits energy that is seen as pulses as the star rotates. ...
COMETARY PARALLAX
... object observed by amateur astronomers. This graphical method seems to favorably compare with spherical trigonometry methods (not discussed). Though applicable to some planets and our Moon, the technique will be demonstrated with comets on close approach (~1 au). This is useful for planned coordinat ...
... object observed by amateur astronomers. This graphical method seems to favorably compare with spherical trigonometry methods (not discussed). Though applicable to some planets and our Moon, the technique will be demonstrated with comets on close approach (~1 au). This is useful for planned coordinat ...
hwd_ewd_v3 - X-ray and Observational Astronomy Group
... temperatures, below ~10,000K, even if present, the signatures of H and He become difficult and eventually impossible to detect. The physics of the atmospheres of these cooler objects is quite different, and understanding their compositions and physical structure is even more complex than for their h ...
... temperatures, below ~10,000K, even if present, the signatures of H and He become difficult and eventually impossible to detect. The physics of the atmospheres of these cooler objects is quite different, and understanding their compositions and physical structure is even more complex than for their h ...