... People . Posts tagged ?Eddington? ... in calculating the mean error of a series of observations it is preferable to use the simple mean residual irrespective of sign rather than the mean square residual . Such eminent astronomer said already least absolute deviation over chi-square , if I match simple mean residual and mean square residual to relevant methodologies, in order. ... Category: Astro , Cross-Cultural , Quotes , Stat , Uncertainty | ... Category: Astro , Bad AstroStat , Jargon | ...

... Mass loss Recipes | ... Mass Loss is the most important "driver" of stellar evolution in massive stars. ... The final goal is to predict mass loss over the entire evolution of a massive star at all cosmological epochs. ... Very Massive Stars are objects up to 300 times the mass of the Sun. ... Mass-loss rates increase dramatically when objects cross a critical Eddington Gamma factor (Vink et al. ... I have recently edited a book on "Very Massive Stars" including a mass-loss "chapter" . ...

... I note that "Z" plays an important role in what the ALFA surveys will look for: . ... low Z . nearby low mass . ... Arecibo . ... ADBS (Arecibo Dual Beam Survey): Rosenberg & Schneider 2002. ... A few sources with unobvious optical counterparts. ... Coverage wins for volume, but if you do a shallow survey you are sampling only the nearby volume at low masses. ... So need artificial test sources to find completeness. ... Total volume within survey in which source could have been detected. ...

... Tonight's Sky . ... Behemoth black hole found in an unlikely place . Gravitational wave search provides insights into galaxy evolution and mergers . ... galaxies . ... Mysterious quasar sequence explained . ... A growing black hole, called a quasar, can be seen at the center of a faraway galaxy in this artist's concept. ... Quasars are supermassive black holes that live at the centers of distant massive galaxies. ... Only registered members of Astronomy.com are allowed to comment on this article. ...

... Recherche dans le site : . Ciel Espace, le magazine qui vous guide toujours plus loin . ... Ciel Espace, nouvelle formule, c'est . des actualitУ?s . ... Accueil Lire/Voir/Ecouter Lire/Voire/Ecouter . ... Lire/Voir/Ecouter . ... Mais il s'emploie autant que possible У  intУ?grer des У?lУ?ments terrestres dans ses compositions photographiques. ... Nous ne saurions donc que trop recommander ce livre aux amateurs d'images du ciel qui veulent dУ?couvrir une pratique hors des sentiers battus. ...

... Stars, in many ways, are just like people. ... Once, people regarded the Sun as a different sort of object than the stars. ... But over the past few centuries astronomers have come to recognize that the Sun is just one middle-aged member of the vast family of stars. ... By studying the Sun, the closest star, scientists have learned about all stars. ... Though we weren't around to witness the birth of our provider, we can read its early life history in the stars. ... The Sun was born. ...

... The group of radio emitting X-ray binaries (XRB's), such as SS433, Cyg X-3, LSI , Cir X-1, etc., exhibit highly variable bursting radio emission interpreted as synchrotron radiation from relativistic electrons. ... In this paper, a numerical model for radio outbursts in XRB's is developed. The model is based on a process of continuous injection of relativistic particles into a spherical expanding plasmon, ejected following a transitory supercritical accretion event onto the compact star. ...

Rep ort by the ESAґESO Working Group on Extra-Solar Planets 4 March 2005 Summary Various techniques are being used to search for extra-solar planetary signatures, including accurate measurement of radial velocity and positional (astrometric) displacements, gravitational microlensing, and photometric transits. Planned space experiments promise a considerable increase in the detections and statistical knowledge arising especially from transit and astrometric measurements over the years 2005ґ15, with some

Journal of the Amateur Astronomers Association of New York November 2009 Volume 57 Number 11, ISSN 0146-7662 EYEPIECE of distant galaxies. ... November 7 M oon a t p er igee (229,226 m iles fr om Earth), 2:25 a.m. November 9 M oon lies n ea r M a r s; la st -quarter Moon at 10:56 a.m. 2 November November November November November Earth, 8:24 12 M oon lies sou t h of Sa t u r n . ... A program surveyed 2,000 stars over five years to look at solar-type stars for low-mass planets. ...

September 2010 ASTRONOTES Incorporating FRIENDS' NEWSLETTER LHC update The Moon and the tides Red Square to Red Planet September night sky Still Impossible! ... The Moon is pulling at the oceans closest to it, causing a high tide whilst on the opposite side of the Earth the pull is weaker causing the oceans to bulge away from the Moon causing another high tide. ... Because the Earth rotates much faster than the Moon, the bulges move around the Earth about once a day giving two high tides per day. ...

Mon. Not. R. Astron. Soc. 349, 1397ґ1418 (2004) doi:10.1111/j.1365-2966.2004.07619.x The 2dF QSO Redshift Survey ґ XII. The spectroscopic catalogue and luminosity function S. M. Croom,1 R. J. Smith,2 B. J. Boyle,1 T. Shanks,3 L. Miller,4 P. J. Outram3 and N. S. Loaring4,5 1 2 3 4 5 Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD Department of Physics, University of