Results 41 to 50 of about 2,548,043 (302)
Iron abundance determination for the solar-like stars HR 4345 and HR 6573 [PDF]
Serbian Astronomical Journal, 2004 Using the BLACKWELL software package written by R.O. Gray, the iron abundance of the solar-like stars HR 4345 and HR 6573 has been determined. The method is based on determination of the minimum dispersion (or the region of least confusion) of the iron ...
Vince Oliver I., Vince Ištvan I.
doaj +1 more source
Data on Stark Broadening of Sn II Spectral Lines
DataData on spectral line widths and shifts broadened by interactions with charged particles, for 44 lines in the spectrum of ionized tin, for collisions with electrons and H II and HeII ions, are presented as online available tables.
Milan S. Dimitrijević +3 more
doaj +1 more source
Program of telluric lines monitoring [PDF]
Serbian Astronomical Journal, 2006 A new observational program of telluric lines monitoring was introduced at Belgrade Astronomical Observatory. The ultimate goal of this program is to investigate the properties of Earth’s atmosphere through modeling the observed profiles of telluric ...
Vince I. +5 more
doaj +1 more source
Alkali Line Profiles in Degenerate Dwarfs
, 2007 Ultracool stellar atmospheres show absorption by alkali resonance lines severely broadened by collisions with neutral perturbers. In the coolest and densest atmospheres, such as those of T dwarfs, Na I and K I broadened by molecular hydrogen and helium ...
Derek Homeier +4 more
core +1 more source
Broad-Line Profile Variability [PDF]
International Astronomical Union Colloquium, 1997 AbstractMany years of monitoring a sample of 10 AGNs with a median sampling rate of about one spectrum per week yields strong evidence that broad-line profile variations are not induced by reverberation effects, but rather signify real changes in the structure of the continuum-source and broad-line region complex, contrary to line flux variations ...
openaire +1 more source
Iron line profiles in strong gravity [PDF]
Monthly Notices of the Royal Astronomical Society, 2004 10 pages, 13 figures, accepted for pulication in MNRAS, major changes to text, structure and figures, version with high resolution figures available from http://star-www.dur.ac.uk/~krcb/ironline ...
Beckwith, Kris, Done, Chris
openaire +2 more sources
Optical Spectroscopy with the Technology of Virtual Observatory
Open Astronomy, 2011 The contemporary astronomy is flooded with an exponentially growing petabyte-scaled data volumes produced by powerful ground and space-based instrumentation as well as a product of extensive computer simulations and computations of complex numerical ...
Škoda P.
doaj +1 more source
Sensitivity of the MnI 539.47 nm spectral line to solar activity [PDF]
Serbian Astronomical Journal, 2004 CCD observations of the MnI 539.47 nm spectral line in the solar flux made at the Astronomical Observatory in Belgrade between 1994 and 2003 have been reduced and certain line parameters, viz.
Danilović Sanja, Vince Ištvan I.
doaj +1 more source
A polar+equatorial wind model for broad absorption line quasars: I. Fitting the C IV BAL profiles
, 2010 Despite all the studies, the geometry of the wind at the origin of the blueshifted broad absorption lines (BAL) observed in nearly 20% of quasars still remains a matter of debate.
Arav +82 more
core +1 more source
CS LINE PROFILES IN HOT CORES [PDF]
The Astrophysical Journal, 2011 We present a theoretical study of CS line profiles in archetypal hot cores. We provide estimates of line fluxes from the CS(1-0) to the CS(15-14) transitions and present the temporal variation of these fluxes. We find that \textit{i)} the CS(1-0) transition is a better tracer of the Envelope of the hot core whereas the higher-J CS lines trace the ultra-
Bayet, E., Yates, J., Viti, S.
openaire +2 more sources