scholarly journals The spectral energy distribution and mass-loss history of IRC + 10420

1996 ◽  
Vol 280 (4) ◽  
pp. 1062-1070 ◽  
Author(s):  
René D. Oudmaijer ◽  
M. A. T. Groenewegen ◽  
H. E. Matthews ◽  
J. A. D. L. Blommaert ◽  
K. C. Sahu
Keyword(s):  
Energy Distribution ◽  
Mass Loss ◽  
Spectral Energy Distribution ◽  
Spectral Energy ◽  
History Of

STUDY OF THE OBJECT HD 87643

2012 ◽  
Vol 18 ◽  
pp. 53-57
Author(s):  
EDUARDO LENHO COELHO ◽  
DALTON DE FARIA LOPES
Keyword(s):  
Energy Distribution ◽  
Mass Loss ◽  
Transfer Equation ◽  
Spectral Energy Distribution ◽  
Astronomical Observatory ◽  
Spectral Energy ◽  
Spherically Symmetric ◽  
Balmer Series ◽  
Exact Integration ◽  
Different Time Scales

HD 87643 is one of the B[e] stars that still defy our understanding to better classify it. The spectroscopic observations of HD 87643 performed in the Astronomical Observatory of La Silla (ESO) between December 1998 and April 2000 show an object far more complex than was already known, with profiles of the Balmer series showing variability on different time scales. This work examine the formation of Hα and Hβ profiles with the SEI method (Sobolev approximation with Exact Integration of the transfer equation), as well as their spectral energy distribution by means of codes Cloudy and Dusty. For a homogeneous and spherically symmetric nebula around a star with T ef ~ 15, 000 K and log L/L⊙ > 4.2, the reproduction of the profiles mentioned was only achieved for Hβ and to some extent, considering two distinct regions with different laws for the expansion of the wind and with different rates of mass loss.

scholarly journals The onset of star formation 250 million years after the Big Bang

2019 ◽  
Vol 15 (S341) ◽  
pp. 221-225 ◽  
Author(s):  
Takuya Hashimoto
Keyword(s):  
Star Formation ◽  
Energy Distribution ◽  
Spectral Energy Distribution ◽  
Big Bang ◽  
Star Formation History ◽  
Spectral Energy ◽  
Distribution Modeling ◽  
Stellar Component ◽  
History Of ◽  
The Big Bang

AbstractIn this IAU symposium, we present results of our recent paper, Hashimoto et al. (2018a) focusing on its spectral energy distribution modeling. We present spectroscopic observations of MACS1149-JD1, a gravitationally lensed galaxy originally discovered by Zheng et al. (2012) via the dropout technique. Using the Atacama Large Millimeter/submillimeter Array (ALMA), we detect an emission line of doubly ionized oxygen, [Oiii] 88 μm, at a redshift of 9.1096±0.0006. This precisely determined redshift indicates that the red rest-frame optical colour observed with the Spitzer Space Telescope arises from a dominant stellar component that formed about 250 million years after the Big Bang, corresponding to a redshift of about 15. MACS1149-JD1 clearly demonstrates the importance and power of spectral energy distribution modeling to understand the earliest star formation history of the Universe.

scholarly journals Are the silicate crystallinities of oxygen-rich evolved stars related to their mass loss rates?

2018 ◽  
Vol 14 (S343) ◽  
pp. 425-426
Author(s):  
Biwei Jiang ◽  
Jiaming Liu ◽  
Aigen Li
Keyword(s):  
Energy Distribution ◽  
Mass Loss ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Spectral Energy Distribution ◽  
Spectral Energy ◽  
Evolved Stars ◽  
Loss Rates

AbstractA sample of 28 oxygen-rich evolved stars is selected based on the presence of crystalline silicate emission features in their ISO/SWS spectra. The crystallinity, measured as the flux fraction of crystalline silicate features, is found not to be related to mass loss rate that is derived from fitting the spectral energy distribution.

The dust production rate of carbon-rich stars in the Magellanic Clouds

2018 ◽  
Vol 14 (S343) ◽  
pp. 478-479
Author(s):  
Ambra Nanni ◽  
Martin A. T. Groenewegen ◽  
Bernhard Aringer ◽  
Paola Marigo ◽  
Stefano Rubele ◽  
...  
Keyword(s):  
Radiative Transfer ◽  
Energy Distribution ◽  
Mass Loss ◽  
Optical Constants ◽  
Spectral Energy Distribution ◽  
Magellanic Clouds ◽  
The Other ◽  
Spectral Energy ◽  
Circumstellar Envelopes ◽  
Dust Production

AbstractWe present our new investigation aimed to estimate the mass-loss and dust production rates of carbon-rich stars (C-stars) in the Magellanic Clouds (MCs). We compute dust growth and radiative transfer in circumstellar envelopes of C-stars for a grid of stellar parameters and for selected optical constants that simultaneously reproduce the main colour–colour diagrams in the infrared. We employ these grids of spectra to fit the spectral energy distribution of C-stars in the MCs. We find that our estimates can be significantly different from the other ones in the literature.

The Spectral Energy Distribution and Mass‐Loss Rate of the A‐Type Supergiant Deneb

2002 ◽  
Vol 570 (1) ◽  
pp. 344-368 ◽  
Author(s):  
J. P. Aufdenberg ◽  
P. H. Hauschildt ◽  
E. Baron ◽  
T. E. Nordgren ◽  
A. W. Burnley ◽  
...  
Keyword(s):  
Energy Distribution ◽  
Mass Loss ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Spectral Energy Distribution ◽  
Spectral Energy

scholarly journals Influence of Microlensing on Spectral Anomalies of the Lensed Objects

2011 ◽  
Vol 20 (3) ◽  
Author(s):  
S. Simić ◽  
L. Č. Popović ◽  
P. Jovanović
Keyword(s):  
Energy Distribution ◽  
Spectral Energy Distribution ◽  
Angular Size ◽  
Black Body ◽  
Spectral Energy

AbstractHere we consider the influence of microlensing on the spectrum of a lensed object with the angular size 5 μas accepting that the composite emission of this object originates from three different regions arranged around its center. We assume that the lensed object has three concentric regions with a black-body emission; the temperatures of these regions are 10 000 K, 7500 K and 5000 K. We investigate how the integral spectral energy distribution (SED) of such stratified source changes due to microlensing by a group of solarmass stars. We find that the SED and flux ratios in the photometric B, V and R passbands show considerable changes during a microlens event. This indicates that the flux anomaly observed in some lensed quasars may be caused by microlensing of a stratified object.

scholarly journals Galaxy And Mass Assembly: the evolution of the cosmic spectral energy distribution from z = 1 to z = 0

2017 ◽  
Vol 470 (2) ◽  
pp. 1342-1359 ◽  
Author(s):  
S. K. Andrews ◽  
S. P. Driver ◽  
L. J. M. Davies ◽  
P. R. Kafle ◽  
A. S. G. Robotham ◽  
...  
Keyword(s):  
Energy Distribution ◽  
Spectral Energy Distribution ◽  
Spectral Energy ◽  
Mass Assembly
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