Abstract -- Abundances of heavy elements decreases with increasing galactocentric distance almost in all disk galaxies. ... To explain this gradient in young objects and in the interstellar gas one has to assume that a typical disk galaxy is an open system, i.e. it expels some synthesized heavy elements into the circumgalactic space and/or accretes intergalactic gas with zero metallicity, with rates of both processes depending on the galactocentric distance. ...

... 1993: . ... Based on the results of spectrophotometric observations with a high signal-to-noise ratio of 15 blue compact galaxies with low abundances of elements heavier than helium, the origin of nitrogen in these objects was investigated. ... Based on the high-accuracy spectrophotometric observations of 10 blue compact galaxies with a low abundance of elements, the most precise value of the mass fraction of helium Y(p) was obtained. ... Archive . ...

... LINKS . ... Founded in 1971 by a group of enthusiasts and star aficionados, our association is now counting more than 130 members.As a national association we attract hobby astronomers from the whole country to our regular night-sky observations and to the meetings in our club at Dudelange. ... Club News . ... by topic : PDF File Download (360KB) . by title : PDF File Download (640KB) . ... Article about AAL in "Le Quotidien" newspaper of Juli 21 2005 - PDF File Download (132KB) . ... SOME LINKS . ...

... VaST is a software tool for finding variable objects on a series of astronomical images. ... VaST performs object detection and aperture photometry using SExtractor on each image, cross-matches lists of detected stars, performs magnitude calibration with respect to the first (reference) image and constructs a lightcurve for each object. ... VaST FITS image viewer ./pgfv . ... Part I" PZP, vol. ... K. V. Sokolovsky, S. A. Korotkiy; "New Variable Stars Discovered by the NMW Survey" PZP, vol. ...

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... SUPER RATIO . ... On this page I will present the most important (on my opinion) idea on Intellegence Life in the Universe . ... On the problem of the Super Ratio in astrophysics" . ... As a matter of fact, this is the main problem of the modern natural science. ... Here I shall try to speak about the most important problem of the modern natural science, the problem which is undoubtedly, of more importance than discovery of Blacks Holes, creation of Grand Unification Theory or Artificial...

... Bad Astronomy . ... On Thursday, February 15th 2001 (and replayed on March 19), the Fox TV network aired a program called ``Conspiracy Theory: Did We Land on the Moon?'', hosted by X-Files actor Mitch Pileggi. ... Dust around the lander . ... However, it appeals to our common sense: when the sky is black here on Earth, we see stars. ... Bad: The program claims that when the top half of the lander took off from the Moon to bring the astronauts back into orbit, there was no flame from the rocket. ...

Тема : 141P-H/Machholz / 141P-H/Machholz H .. Показать сообщение отдельно . 07.09.2015, 00:38 . ... Сообщений: 19,465 . 141P-H/Machholz / 141P-H/Machholz H .. 141P-H/Machholz , MPEC 2015-R12 . ... 141P-H/Machholz н/д . ... Элементы орбиты (orbital elements) короткопериодической кометы 141P-H/Machholz: . ... T 2015 Aug. ... From 81 observations 2015 Aug. ... 141P/1994 P1-E (Machholz) . T 1994 Sept. ... Эфемериды (ephemeris) короткопериодической кометы 141P-H/Machholz: . ...

T Ant [A/H] = -0.0. P var, nonlinear elements: Max = 2436120.756 T Ant + 5.897915d*E + 4.80d*10^{-8}E^2 [00027]. ... 00000]. ... Brightness variations with AG Ant the orbital period probably due to variations of circumstellar AG Ant extinction. ... R Ara Min II 6.2. ... The data in [00002] reveal RR Tel current V-band variations with a small amplitude and nearly RR Tel the same period [00000]. ... V0340 Tel The data from [00002] do not confirm the tabulated period V0340 Tel [00000]. ...

... The Utilization of Spatial Enhancement of Landsat Images in the Delineation of Structural Elements, Red Sea Hills, NE - Sudan . ... In contrast to spectral image enhancements, spatial filters emphasize or de-emphasize image data of various spatial frequencies. ... Wherein, most of the structural elements in the area are clear and esily descernible. Subtle enhancements on the structural lineaments in the area enabled the author to produce a structural map of the area under investigation. ...

... Uncovering the Chemistry of Earth-like Planets . ... An Earth-like planet, born from the same nebula as its host star, is composed primarily of silicate rocks and an iron-nickel metal core, and depleted in volatile content in a systematic manner. The more volatile (easier to vaporize or dissociate into gas form) an element is in an Earth-like planet, the more depleted the element is compared to its host star. ... Apr . ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

Lunar and Planetary Science XXXIV (2003) 1575.pdf MAJOR AND TRACE ELEMENT CHEMISTRY AND Ar-Ar AGE OF THE NWA E.V. Korotchantseva1,2, M.A. Ivanova1, C.A. Lorenz1, A.I. Bouikine1,2, M. Trieloff2, Promprated3, M. Anand3, and L.A. Taylor3 : ... Universitфt Heidelberg, Germany; 3Planetary Geosciences Institute, University of Tennessee, Knoxville, T Introduction: Northwest Africa ( NWA ) 011 was originally described as a non-cumulate eucrite with an anomalous Fe/Mn ratio [1] ... REEs of NWA 011. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Stars . ... Telescopes and Observatories . ... The majestic star-forming region in the Lagoon Nebula. The pale ring to the right is an internal reflection in the telescope.€а (Image credit: ESO/ VPHAS+/ V. Kalari and J. Vink (Armagh Observatory) . ... The 18 component images were further processed twice. ... Venu and his colleagues use images like this to identify individual young forming stars in the Lagoon Nebula and determine their ages. ...

Альтернативный форум . ... Александр Тимофеев, Numerologist (@) - 02.04.2005 16:04 . Квантование гравитационного заряда в Солнечной системе . ... Re: Квантование гравитационного заряда в Солнечной системе - НА РУССКОМ Александр Тимофеев, Empiricist, 04.04.2005 14:12 . ... Квантование гравитационного заряда в Солнечной системе Александр Тимофеев, Numerologist, 02.04.2005 16:04 . ... Re: Квантование гравитационного заряда в Солнечной системе - НА РУССКОМ Александр Тимофеев, 04.04.2005 20:14 . ...

Neptune is the coldness kingdom. ... Mass . ... The period of rotation . ... The average distance from the Sun . ... Excentricity of the orbit . ... Neptune is the eighth from the Sun great planet. ... From all the elements in Neptune the main are hydrogen and helium in such ratio(approximately) as in the Sun in one helium atom falls 20 atoms of hydrogen. ... According to the theoretical data there is a cloak and a core in Neptune. The core mass may by 90% of the entire planet’s mass. ...