The Spectral Energy Distribution and the UV Excess in the Herbig be Candidate HD 45677

Aims. Very recently, a second companion on a wider orbit has been discovered around GQ Lup. This is a low-mass accreting star that is partially obscured by a disk seen at high inclination. If detected, this disk may be compared to the known disk around the primary. Methods. We detected this disk on archive HST and WISE data. Results. The extended spectral energy distribution provided by these data confirms the presence of accretion from Hα emission and UV excess, and shows an IR excess attributable to a warm disk. In addition, we resolved the disk on the HST images. It is found to be roughly aligned with the disk of the primary. Both of them are roughly aligned with the Lupus I dust filament containing GQ Lup.

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Exploring the UV excess in star clusters of different mass

Proceedings of the International Astronomical Union ◽

10.1017/s1743921315010686 ◽

2015 ◽

Vol 12 (S316) ◽

pp. 143-144

Author(s):

Fabiola Hernández-Pérez ◽

Gustavo Bruzual ◽

Magris C. Gladis

Keyword(s):

Energy Distribution ◽

Binary Stars ◽

Spectral Energy Distribution ◽

Star Clusters ◽

Stellar Populations ◽

Spectral Energy ◽

Stochastic Fluctuations ◽

Uv Excess ◽

The Imf

AbstractWe compute the expected spectral energy distribution of stellar populations of mass characteristic of star clusters taking into account stochastic fluctuations in the number of stars populating the IMF, and the presence of interacting binary stars in the cluster population. We evaluate under what circumstances the UV excess phenomenon is expected to appear in star clusters of different mass, and which is its most likely source: the stochastic fluctuations, the result of binary interactions, or a mixture of both.

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Modelling the Spectral Energy Distribution of Star-Forming Galaxies with Radiative Transfer Methods

Star-Formation Rates of Galaxies ◽

10.1017/9781316875445.012 ◽

2021 ◽

pp. 204-224

Author(s):

Cristina Popescu

Keyword(s):

Radiative Transfer ◽

Energy Distribution ◽

Spectral Energy Distribution ◽

Spectral Energy ◽

Star Forming

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Influence of Microlensing on Spectral Anomalies of the Lensed Objects

Open Astronomy ◽

10.1515/astro-2017-0324 ◽

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.

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