... Emission and Reflection in NGC 6559 . ... Credit: Robert Gendler Explanation: Bright gas and dark dust permeate the space between stars in a nebula known as NGC 6559 . ... Small dust particles reflect blue starlight efficiently and so creates the blue reflection nebulosity seen near two of the bright stars. ... Publications with keywords: reflection nebula - emission nebula - NGC 6559 . Publications with words: reflection nebula - emission nebula - NGC 6559 . ... Emission Nebula IC 1396 . ...

In two previous papers we investigated in detail the formation of Hydrogen lines in high pressure dMe stellar chromospheres, constraining the possible structures over a two orders of magnitude pressure range. ... We found that when decreasing the transitoin region presure (i.e. the chromospheric temperature gradient), the Balmer lines change rapidly from emission to strong absorption, then the profiles weaken and become narrower until they disappear totally (zero H$_{\alpha}$ stars). ...

The neutral hydrogen in dust cloud . ... The intensity of line emission of neutral hydrogen (HI) is proportional to concentration of gas and is inverse proportional its temperature.Therefore the reduction of intensity emission of HI in dust clouds could not be interpeted simple. It has been observed the decreasing of HI line absorption at radiation frequencies and coordinates of the dense dust cloud which covered the most part of NGC 6618 nebula (figures 1 and 2). ...

... To determine a lower limit to the sensitivity of current observations to measurements of NS surface temperatures, we have used data from the Einstein Slew Survey (Elvis et al. 1990) to establish temperature limits for 275 pulsars which received nonzero exposure during the survey. ... Filled squares correspond to pulsars actually detected in the survey data; the smaller symbols correspond to upper limits to the count rates. ... Click here for plot of x-ray data vs. cooling curves. ...

... ATNF Home . About ATNF . ... About ATNF overview . ... Australia Telescope Steering Committee . ... ATNF facilities . ... Near-IR Fluorescent Molecular Hydrogen Emission from NGC 2023 . ... Spectra from 1 to 2.5 m, at 230-430 spectral resolution, are presented of the fluorescent molecular hydrogen line emission from two locations in the reflection nebula NGCб 2023. ... These data may be used to constrain models both of photodissociation regions and of fluorescent excitation for molecular hydrogen. ...

Subject, Problems and Objects of Theoretical Astrophysics. ... Stellar Photospheres, Their Features. ... Physics of Continuous Radiation Absorption in Stellar Photospheres. ... Continuous Radiation Absorption in Stellar Photospheres of Various Spectral Classes. Solar Type Photospheres. ... Characterisics of Absorption Lines. ... Interstellar Absorption Lines, Their Features. ... Physical and Dynamic Features of Interstellar Medium, Which Follows from Observations of Interstellar Absorption Lines. ...

... Program of the Course of Radio Astronomy . Moscow State University , Physics Department , Astronomy Division , 4 th year, 60 hours in total) . ... Molecular maser emission. ... The emission of the interstellar neutral hydrogen. ... Pacholczyk, A. G. Radio Astrophysics, W. H. Freeman & Co., ... Frontiers of Astrophysics, Avrett, E. H., ed., Harvard University Press, Cambridge, Mass., ... Kaplan, S. A., Pikelner, S. B. The Interstellar Medium, Harvard University Press, Cambridge, Mass., ...

We would like to announce the release of Version 3.02 of the CHIANTI database for astrophysical spectroscopy. This now extends the database to include the 1 - 50 wavelength region. The additions to the database are described in a paper `CHIANTI - an atomic database for emission lines, IV - Extension to X-ray Wavelengths' by K.P. Dere, E. Landi, G. Del Zanna, and P.R. Young and accepted for publication by the Astrophysical Journal Supplement Series. ... Atomic Data Updates (April 30, 2001) . ...

Microsymposium 34, MS058, 2001 ANOMALIES OF THE MOON'S THERMAL EMISSION IN THE IR SPECTRAL RANGE (10.5 - 12.5 micron). ... Sternberg State Astronomical Institute, Moscow, 119899, Russia, pugach@sai.msu.ru Summary: New satellite measurements of the lunar-surface radiation temperature were used to construct the spatial angular function of thermal radiation of the Moon in the infrared (10.5-12.5 micron) spectral range. ... These thermal anomalies are observed only in the limited range of phase angles. ...

... An interactive IRAF task for the analysis of Extreme Ultraviolet Explorer ( EUVE ) emission line spectra is presented. The line flux in extracted spectra may be measured by multiple techniques, including fitting individual lines. ... To aid in identifying lines, the positions of known lines may be marked on the spectrum during the fitting process. Also, model EUVE spectra may be constructed and overlaid using plasma emissivities and source emission measures supplied by the user. ...

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 ...

This image from NASA's IRIS spacecraft shows the region around two sunspots - the dark areas at upper left and lower right. It shows emission from ionized silicon (Si IV) in the transition region at a temperature of about 116,000ТА Fahrenheit (64,000ТА Celsius), plus ultraviolet continuum from the chromosphere at a temperature of about 17,000ТАF (9,000ТАC). The bright dots are short-lived intense patches of Si IV emission. ...

Journal of Alloys and Compounds 253 ­ 254 ( 1997 ) 353 ­ 355 L 57 57 Ё Mossbauer experiments with Fe and Co in palladium hydride: Diffusional relaxation and high hydrogen concentrations a a, a b c ґb M. Baier , G.F. Schneider *, F.E. Wagner , I. Dugandzic , H.J. Bauer , V.E. Antonov , T.E. Antonova In highly loaded absorbers the iron probes were found to be practically always surrounded by six hydrogen neighbours despite the repulsive iron ­ hydrogen interaction. ...

... Amorphous carbonaceous materials can show a great diversity of optical properties due to the variability in their microstructure. ... The differently pyrolized celluloses are representative for a suit of carbonaceous material ranging from strongly disordered (insulating) to graphitized (conducting) material. Figure: Complex refractive index of hydrogenated amorphous carbon prepared by pyrolysis (annealing) of cellulose at different temperatures. ...

... 1998: . ... Collaboration with the IAP RAS). direct measurements of the magnetic field in the coronal hole at the bottom of the corona were performed, the magnetic field strength (the calculations were carried out as part of the thermal bremsstrahlung mechanism of radio emission generation of the solar plasma in the weak magnetic field ) increases from the values of 0.2G at the photosphere level up to 7-10G at the level of radio ... Archive . ...

... Science . ... Science Users Information > Science Publications > Science Announcements > Tools to Correct for Telluric Absorption and Emission Lines . ... Observing Facilities . ... Paranal Facilities . ... Observing with ESO Telescopes . ... Data Handling and Products . ... Science Data Products Forum . ... Science Archive Facility . ... ESO Data . ... Two software tools to correct astronomical spectra for telluric absorption ( molecfit ) and emission ( skycorr ) lines have been publicly released. ...

... Low-latitude aurorae are a storm time phenomena, in which particles originating from the ring current (and/or which are energized by the ring current) enter the lower thermosphere causing optical emission. It has been suggested (Rassoul et al., 1993) that four "pure" types of such auroras exist, as shown in table below, where LEE = low energy electron aurora, and HP = heavy particle aurora. ... low-latitude . ... One should thus not confuse them with other red emissions from much lower altitudes. ...

A Tunable 350-780 GHz CW Solid State Oscillator of Intrinsic Josephson Junctions in a high-Tc Superconductor H. B. Wang#,*, M. Y. Li#,*, J. Yuan#, N. Kinevy, J. Li#, B. Grossz, S. Guenonz, A. Ishii# ... Quantum Phenomena in LISA+, Universitaet Tuebingen, D-72076 Tuebingen, Germany Email: hbwang1000@gmail.com Abstract--We report on THz emission measurements and low temperature scanning laser imaging of Bi2Sr2CaCu2O8 intrinsic ...

Get thermodynamics values for any combination of temperature, density and hydrogen mass fraction using MHD, OPAL or ISG equations of state. ... 3.0 < lg T < 7.5 . ... Hummer, D.G., Mihalas, D., 1988. Ap.J. 331 , 794-814. Mihalas, D., Dappen W. and Hummer, D.G., 1988. Ap.J., 331 , 815-825. Dappen, W., Mihalas, D., Hummer, D.G. and Mihalas, B.W., 1988. Ap.J., 332 , 261-270. ... Rogers, F.J., 1994. in IAU Colloq. ... Rogers, F.J., Swenson, F.J., Iglesias, C.A., 1996. ...

... Theavailable grating tilts (i.e. spectrum centers) are: Low Dispersion Blue (bandwidth ~ 3250 ) Red (bandwidth ~ 3250 )Hydrogen 4400 7700 Helium 4000 (not 4400 ) 7700 Neon 4400 7700 Argon 4400 7700 Mercury 4400 7700 *High Dispersion Blue (bandwidth ~ 835 ) Red (bandwidth ~ 1100 )Hydrogen Helium 4200 4700 Neon 5100 6000 6800 7600 8400 Argon 4400 7300 8000 8800 9600 Mercury 4000 5600 * * Hg red spectrum dominated by contaminating argon . ... Generate GIF images using: . ... scaling the PICT image . ...