... Stellar Evolution is driven entirely by the never ending battle between Pressure and Gravity . As imbalances are reached, the star is driven to find a new Energy source. ... Pressure and gravitational forces are equal, the star is stable and its core is sufficiently hot to fuse Hydrogen into Helium More about main sequence stars . ... The luminosity generated by the core fusion of Helium into Carbon is far greater than the shell luminosity associated with the fusion of Hydrogen into Helium. ...

... Exposure Time Calculator (ETC) . ... ESO - Public Surveys . ... the recommended values to use for DIT, . ... Detector on-chip integration (DIT): seconds. to your chosen value - a separate page gives recommended values to use for DIT - for modes 1 and 2 below you may wish to start with the maximum recommended values as these will minimize the effect of read noise (a total object exposure of Y secs with DIT=X secs will produce Y/X lots of read noise) and give you a lower limit on the time needed. ...

. Pulkovo Observatory of Russian Academy of Sciences is situated . near Saint-Petersburg. It was founded in 1839. 196140, Saint-Petersburg, Pulkovskoye chaussee 65/1 . English version . Russian version . This page has been accessed times since May 1, 1999.

SCORPIO descriptions and manuals . SCORPIO user's manual (in Russian) : Load PDF (Ver. ... Internal commands for RS232 comport : Load PDF . ... 2005, PaZH, 31, 214 ( Russian PDF ); . 2005, Astronomy Letters, 31, 194 ( English PDF ) . ... 2005, Bull. SAO, 58, 90 ( Russian PDF ); ( English PDF ) . ... In Russian: SAO preprint, 2002, N 166 Load PS . ... SAO, 54 Load PDF . ... Посмотреть презентацию в виде PDF . ... Спектроскопия: печали и чуть больше радости. презентацию в виде PDF . ...

... Description . Catalog . ... In the Catalog, we publish equatorial (ЮБ 2000 , ЮД 2000 ) and galactic (l,b) coordinates of cluster centers derived as the position of overdensity in 2MASS catalog (Koposov et al. ... Distances, color-excesses and ages are the mean-square values calculated using all available evaluations from different color-magnitude diagrams. ... There are individual pages for every cluster where all available plots and parameters are published. ... 2002). ...

... Supports huge images and has been tested with gigapixel-size images. ... Proposed directory for placement: /pub/os2/apps/graphics Your name: Gianfilippo Cimmino Email address: gianfli dot cim at gmail dot com Program contact name: (same) Program contact email: (same) Program URL: http://www.graphicsmagick.org/ Would you like the contact email address included in listings? yes Operating System/Version: OS/2 Warp 4.5 or eCS Additional requirements: GCC runtime (4.7.3) libc runtime (0.6.5) Replaces: ...

The database contains references to the papers, data files and links to the Internet resources related to measurements and calculations of the optical constants in the wavelength interval from X-rays to radio domain. ... References to some useful books and reviews on the subject (e.g. the classical handbooks edited by E.D.Palik) and links to Internet collections of optical constants and personal WWW pages with related software were also placed in the database. You have arrived at our welcome page. ...

... On­The­Fly Re­Calibration of HST Observations B. Pirenne and A. Micol Space Telescope -- European Coordinating Facility, ESO, Garching, D­85748 D. Durand and S. Gaudet Canadian Astronomy Data Centre, DAO, Victoria, BC Abstract. ... On­the­fly re­calibration data flow: from request submis­ sion to data delivery. ... On­the­fly re­calibration has another advantage for our archive sites: we only need to keep the raw data and calibration reference files on­line for the process to be automatic. ...

NAUTICAL ASTRONOMICAL ALMANAC for 2005-2006 (in Russian) . ... The Institute of Applied Astronomy of the Russian Academy of Sciences submits the next issue of тАЬThe Nautical Astronomical Almanac for the years 2005-2006тАЭ (NAA-2) biennial. NAA-2 is based on тАЬ The Nautical Astronomical Yearbook тАЭ (NAY) also prepared by IAA RAS. ... The structure of тАЬThe Nautical Astronomical Almanac for the years 2005-2006тАЭ has not undergone essential changes in comparison with the previous issue of NAA-2. ...

Astronomical Data Center . ... You can access the files described here in three ways: . ... Use CDS' VizieR Service at ADC to explore the data files. ... Get the data files via anonymous FTP. ... 1981) -------------------------------------------------------------------------------- Byte-per-byte Description of file : table1a Byte-per-byte Description of file : table1b -------------------------------------------------------------------------------- Bytes Format Units Label Explanations ...

Description and Technical Details . In 1980s two medium-size horizontal solar telescopes 50/35000 cm with large spectrographs Czerny-Turner made by Carl Zeiss Jena were installed in the Ondњejov observatory. The Czerny-Turner-spectrographs in the Ondњejov observatory called HSFA1 and HSFA2 according to the German name Horizontal-Sonnen-Forschungs-Anlage ("horizontal device for solar research") have been explored for more than two decades. ... Diffraction grating - Richardson, Spectra-Physics . ...