scholarly journals Intensity interferometry of P Cygni in the H α emission line: towards distance calibration of LBV supergiant stars

2020 ◽  
Vol 494 (1) ◽  
pp. 218-227 ◽  
Author(s):  
J-P Rivet ◽  
A Siciak ◽  
E S G de Almeida ◽  
F Vakili ◽  
A Domiciano de Souza ◽  
...  
Keyword(s):  
High Resolution ◽  
Emission Line ◽  
Physical Modelling ◽  
High Resolution Spectrum ◽  
Local Universe ◽  
Intensity Interferometry ◽  
Gaia Dr2 ◽  
Luminous Blue Variable ◽  
Linear Diameter

ABSTRACT We present intensity interferometry of the luminous blue variable P Cyg in the light of its H α emission performed with 1 m-class telescopes. We compare the measured visibility points to synthesized interferometric data based on the CMFGEN physical modelling of a high-resolution spectrum of P Cyg recorded almost simultaneously with our interferometry data. Tuning the stellar parameters of P Cyg and its H α linear diameter, we estimate the distance of P Cyg as 1.56 ± 0.25 kpc, which is compatible within 1σ with 1.36 ± 0.24 kpc reported by the Gaia DR2 catalogue of parallaxes recently published. Both the values are significantly smaller than the canonic value of 1.80 ± 0.10 kpc usually adopted in literature. Our method used to calibrate the distance of P Cyg can apply to very massive and luminous stars both in our Galaxy and neighbouring galaxies, and can improve the so-called wind momentum–luminosity relation that potentially applies to calibrate cosmological candles in the local Universe.

FeXIV Line Emission Polarization of the July 11, 1991 Solar Corona

1994 ◽  
Vol 144 ◽  
pp. 541-547
Author(s):  
J. Sýkora ◽  
J. Rybák ◽  
P. Ambrož
Keyword(s):  
High Resolution ◽  
Solar Corona ◽  
Emission Line ◽  
Solar Eclipse ◽  
White Light ◽  
Preliminary Analysis ◽  
Line Emission ◽  
Total Solar Eclipse ◽  
Degree Of Polarization ◽  
High Resolution Images

AbstractHigh resolution images, obtained during July 11, 1991 total solar eclipse, allowed us to estimate the degree of solar corona polarization in the light of FeXIV 530.3 nm emission line and in the white light, as well. Very preliminary analysis reveals remarkable differences in the degree of polarization for both sets of data, particularly as for level of polarization and its distribution around the Sun’s limb.

Study of the high resolution spectrum of 32 S 16 O 18 O: The ν 1 and ν 3 bands

2016 ◽  
Vol 168 ◽  
pp. 29-39 ◽  
Author(s):  
O.N. Ulenikov ◽  
E.S. Bekhtereva ◽  
Yu.V. Krivchikova ◽  
V.A. Zamotaeva ◽  
T. Buttersack ◽  
...  
Keyword(s):  
High Resolution ◽  
High Resolution Spectrum ◽  
O 18

High resolution spectrum of GdO

1976 ◽  
Vol 54 (24) ◽  
pp. 2429-2434 ◽  
Author(s):  
B. R. Yadav ◽  
S. B. Rai ◽  
D. K. Rai
Keyword(s):  
High Resolution ◽  
Emission Spectrum ◽  
Visible Emission ◽  
High Resolution Spectrum ◽  
First Order ◽  
Isotopic Shifts ◽  
Vibrational Constants ◽  
Dc Arc

The visible emission spectrum of the GdO molecule has been produced in a DC arc source and has been photographed in the first order of a 10.6 m grating spectrograph. Bands are shown to have a six-headed structure and improved vibrational constants have been obtained in this study. Isotopic shifts have been calculated for the various isotopic molecules. Tentative suggestions regarding the nature of the transition have been made.

High resolution spectrum of NO2 loosely bound states: densities of states and long range forces

2001 ◽  
Vol 3 (12) ◽  
pp. 2268-2274 ◽  
Author(s):  
Sylvain Heilliette ◽  
Antoine Delon ◽  
Patrick Dupre´ ◽  
Re´my Jost
Keyword(s):  
High Resolution ◽  
Long Range ◽  
Bound States ◽  
High Resolution Spectrum ◽  
Densities Of States

A Novel Method for 13C-NMR Spectroscopy of Polymer in Emulsion: Quantitative Analysis of Microstructure of Crosslinked Polybutadiene in Latex

1999 ◽  
Vol 72 (5) ◽  
pp. 844-853 ◽  
Author(s):  
Seiichi Kawahara ◽  
Saori Bushimata ◽  
Takashi Sugiyama ◽  
Chihiro Hashimoto ◽  
Yasuyuki Tanaka
Keyword(s):  
Nmr Spectroscopy ◽  
High Resolution ◽  
13C Nmr ◽  
Lattice Relaxation ◽  
13C Nmr Spectroscopy ◽  
Lattice Relaxation Time ◽  
Solid Sample ◽  
Spin Lattice Relaxation ◽  
High Resolution Spectrum ◽  
C Nmr

Abstract A novel analytical method using high resolution 13C-NMR spectroscopy to study polymer latex, which is a heterogeneous system comprising polymer dispersoid and water, is described. The appropriate concentrations of surfactant and dried rubber content of a polybutadiene latex, which give the best spectrum, were found to be 1 w/v % and 10%, respectively. The half-widths of resonance peaks for the latex sample were almost identical to the half-widths obtained in solution, which were about one-third the width of those obtained using a solid sample of either a crosslinked or soluble polybutadiene. Nevertheless, the signal to noise ratio for the latex sample was slightly smaller than that for the solution sample. The values of spin-lattice relaxation time, T1, for the latex sample were similar to those for the solid sample. These demonstrate that the latex state C-NMR spectroscopy will be a powerful technique for structural characterization of crosslinked gels in the dispersoid because it gives a high resolution spectrum comparable to solution state spectroscopy, showing short T1 values corresponding to those for solid state C-NMR spectroscopy. High resolution latex state 13C-NMR spectroscopy was used to determine the concentrations of the various isomers of the polybutadiene in the dispersoid.

Analysis and fit of the high-resolution spectrum of the Ã1Au–1Ag LIF spectrum of the two-equivalent-top molecule biacetyl

2009 ◽  
Vol 256 (2) ◽  
pp. 198-203 ◽  
Author(s):  
Chen-Lin Liu ◽  
Cheng-Liang Huang ◽  
Chi-Kung Ni ◽  
Nobukimi Ohashi ◽  
Jon T. Hougen
Keyword(s):  
High Resolution ◽  
High Resolution Spectrum

High-resolution spectrum of the ν9 band and reinvestigation of the ν8 band of cis-CH3ONO

2012 ◽  
Vol 113 (11) ◽  
pp. 1250-1260
Author(s):  
V. Sironneau ◽  
P. Chelin ◽  
F. Kwabia Tchana ◽  
I. Kleiner ◽  
J. Orphal
Keyword(s):  
High Resolution ◽  
High Resolution Spectrum

High-resolution spectrum of xenon ions at 134 nm

2003 ◽  
Vol 28 (16) ◽  
pp. 1478 ◽  
Author(s):  
Sergei Churilov ◽  
Yogi N. Joshi ◽  
Joseph Reader
Keyword(s):  
High Resolution ◽  
High Resolution Spectrum

Chemical Composition of a Young Star HD 377

2012 ◽  
Vol 21 (4) ◽  
Author(s):  
Tõnu Kipper
Keyword(s):  
Chemical Composition ◽  
High Resolution ◽  
Main Sequence ◽  
Young Star ◽  
Main Sequence Star ◽  
High Resolution Spectrum ◽  
Atmospheric Parameters

AbstractA high resolution spectrum of a pre-main sequence star HD 377 is analyzed. The atmospheric parameters are found to be: T

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