A search for a new class of pulsating DA white dwarf stars in the DB
... stars, or GW Vir stars, of which there are fewer than a couple of dozen known; they have 170 000 ≥ T eff ≥ 75 000 K. The asteroseismic record holder at the time of this writing is the prototype of this class, PG 1159−035 itself, which has 198 pulsation modes ...
... stars, or GW Vir stars, of which there are fewer than a couple of dozen known; they have 170 000 ≥ T eff ≥ 75 000 K. The asteroseismic record holder at the time of this writing is the prototype of this class, PG 1159−035 itself, which has 198 pulsation modes ...
Article PDF - IOPscience
... performed with HSTphot (Dolphin 2000), a photometry package specifically designed to handle the undersampled PSF of the WFPC2/HST data. A number of initial pre-processing steps are required before running the photometry procedure. First, image defects such as bad columns and saturated pixels are ide ...
... performed with HSTphot (Dolphin 2000), a photometry package specifically designed to handle the undersampled PSF of the WFPC2/HST data. A number of initial pre-processing steps are required before running the photometry procedure. First, image defects such as bad columns and saturated pixels are ide ...
November, 2015 - The Baton Rouge Astronomical Society
... One big early surprise (1995) was the ground-based discovery of “hot Jupiters:” gas giants the size of Jupiter in orbits around their parent stars much closer than Venus—or even Mercury—is to the Sun. How does something that massive form so close to a parent star? Would there have been enough materi ...
... One big early surprise (1995) was the ground-based discovery of “hot Jupiters:” gas giants the size of Jupiter in orbits around their parent stars much closer than Venus—or even Mercury—is to the Sun. How does something that massive form so close to a parent star? Would there have been enough materi ...
Surface Gravity as a Diagnostic ... Youth Cameron Higby-Naquin Advisor: Eric Jensen
... Knowing the age of a star is only the first step to understanding stellar evolution and completely describing how stars change with time. In short, different stars take different amounts of time to form, and to fully grasp the formation process, physical properties of the star must be determined. A ...
... Knowing the age of a star is only the first step to understanding stellar evolution and completely describing how stars change with time. In short, different stars take different amounts of time to form, and to fully grasp the formation process, physical properties of the star must be determined. A ...
The Korean 1592--1593 Record of a Guest Star: Animpostor`of the
... Korean astronomers in 1592–1593, for which Brosche (1967) and Chu (1968) independently proposed that it might have been the Cas A SN event. On the other hand, Stephenson & Yau (1987) (see also Stephenson & Green 2002, for a summary), who studied this Korean record in detail, concluded that not only ...
... Korean astronomers in 1592–1593, for which Brosche (1967) and Chu (1968) independently proposed that it might have been the Cas A SN event. On the other hand, Stephenson & Yau (1987) (see also Stephenson & Green 2002, for a summary), who studied this Korean record in detail, concluded that not only ...
Chapter 12
... seems to move against the background even though in reality it is your head that has changed position, not your hand. This simple demonstration illustrates how parallax gives a clue to an object’s distance. If you hold your hand at different distances from your face, you will notice that the apparen ...
... seems to move against the background even though in reality it is your head that has changed position, not your hand. This simple demonstration illustrates how parallax gives a clue to an object’s distance. If you hold your hand at different distances from your face, you will notice that the apparen ...
Title: Binary interaction dominates the evolution of massive stars
... In a binary system, the evolutionary path of a massive star is drastically altered by the presence of a nearby companion (6-8). Because stars expand as they evolve, those in pairs with orbital periods up to about 1500 days exchange mass (6). The more massive star can be stripped of its entire envelo ...
... In a binary system, the evolutionary path of a massive star is drastically altered by the presence of a nearby companion (6-8). Because stars expand as they evolve, those in pairs with orbital periods up to about 1500 days exchange mass (6). The more massive star can be stripped of its entire envelo ...
Protostellar/PMS Mass Infall Luminosity Problem
... mass, as in the Herschel Orion Protostar Survey (HOPS, Manoj et al. 2013; Fisher et al. 2013; Stutz et al. 2013) ...
... mass, as in the Herschel Orion Protostar Survey (HOPS, Manoj et al. 2013; Fisher et al. 2013; Stutz et al. 2013) ...
Compare/Order Decimals
... 3-1 and Ordering Decimals Additional Example 3: Comparing and Ordering Decimals Order the decimals from least to greatest. ...
... 3-1 and Ordering Decimals Additional Example 3: Comparing and Ordering Decimals Order the decimals from least to greatest. ...
Astrophysics Pristine CNO abundances from Magellanic Cloud B stars
... Large Magellanic Cloud (LMC). Apart from H ii regions, unevolved OB-type stars are currently the only accessible source of present-day CNO abundances for the MCs not altered by stellar evolution. Using UVES on the VLT, we obtained spectra of sufficient resolution (R = 20 000) and signal-to-noise (S/ ...
... Large Magellanic Cloud (LMC). Apart from H ii regions, unevolved OB-type stars are currently the only accessible source of present-day CNO abundances for the MCs not altered by stellar evolution. Using UVES on the VLT, we obtained spectra of sufficient resolution (R = 20 000) and signal-to-noise (S/ ...
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 ...
The 2006 RBSE Journal - National Optical Astronomy Observatory
... To pick a target I went to http://gtn.sonoma.edu/participants/catalog and looked the objects listed. I decided to use the target AO 0235+164, an AGN, for my project. I used Starry Night Pro 3.1 to locate and predict where the target would be for observation. After imputing the Right Ascension (RA) a ...
... To pick a target I went to http://gtn.sonoma.edu/participants/catalog and looked the objects listed. I decided to use the target AO 0235+164, an AGN, for my project. I used Starry Night Pro 3.1 to locate and predict where the target would be for observation. After imputing the Right Ascension (RA) a ...
The 2008 RBSE Journal - National Optical Astronomy Observatory
... The star formations within the galaxy that ends up creating most of the stars are known as ultra-luminous clusters. They are about 10-20 light-years across and can have luminosities up to 100 million times that of the Sun. These clusters are the densest starforming environments known. The thing that ...
... The star formations within the galaxy that ends up creating most of the stars are known as ultra-luminous clusters. They are about 10-20 light-years across and can have luminosities up to 100 million times that of the Sun. These clusters are the densest starforming environments known. The thing that ...
November Celestial Calendar by Dave Mitsky All times are UT
... November 17. Mercury lies less than one degree south of the much fainter Saturn in Libra on the mornings of November 25 and November 26. By the end of the month, the speedy planet brightens to magnitude -0.6. Venus is 11 degrees above the horizon one hour after sunset on November 1. By month’s end, ...
... November 17. Mercury lies less than one degree south of the much fainter Saturn in Libra on the mornings of November 25 and November 26. By the end of the month, the speedy planet brightens to magnitude -0.6. Venus is 11 degrees above the horizon one hour after sunset on November 1. By month’s end, ...
Auriga (constellation)
Auriga is one of the 48 constellations listed by the 2nd-century astronomer Ptolemy and remains one of the 88 modern constellations. Located north of the celestial equator, its name is the Latin word for ""charioteer"", associating it with various mythological charioteers, including Erichthonius and Myrtilus. Auriga is most prominent during winter evenings in the Northern Hemisphere, along with the five other constellations that have stars in the Winter Hexagon asterism. Because of its northern declination, Auriga is only visible in its entirety as far as 34° south; for observers farther south it lies partially or fully below the horizon. A large constellation, with an area of 657 square degrees, it is half the size of the largest constellation, Hydra.Its brightest star, Capella, is an unusual multiple star system among the brightest stars in the night sky. Beta Aurigae is an interesting variable star in the constellation; Epsilon Aurigae, a nearby eclipsing binary with an unusually long period, has been studied intensively. Because of its position near the winter Milky Way, Auriga has many bright open clusters in its borders, including M36, M37, and M38, popular targets for amateur astronomers. In addition, it has one prominent nebula, the Flaming Star Nebula, associated with the variable star AE Aurigae.In Chinese mythology, Auriga's stars were incorporated into several constellations, including the celestial emperors' chariots, made up of the modern constellation's brightest stars. Auriga is home to the radiant for the Aurigids, Zeta Aurigids, Delta Aurigids, and the hypothesized Iota Aurigids.