Ultraviolet spectra of quenched carbonaceous composite derivatives: Comparison to the '217 nanometer' interstellar absorption feature

1994 ◽  
Vol 430 ◽  
pp. 311 ◽  
Author(s):  
Akira Sakata ◽  
Setsuko Wada ◽  
Alan T. Tokunaga ◽  
Takatoshi Narisawa ◽  
Hidehiro Nakagawa ◽  
...  
Keyword(s):  
Absorption Feature ◽  
Interstellar Absorption ◽  
Ultraviolet Spectra

scholarly journals Quiescent and flaring lyman-α radiation of host stars and effects on exoplanets

2015 ◽  
Vol 11 (S320) ◽  
pp. 391-396
Author(s):  
Jeffrey L. Linsky ◽  
Kevin France ◽  
Yamila Miguel ◽  
Lisa Kaltenegger
Keyword(s):  
Emission Lines ◽  
Late Type ◽  
Chemical Abundances ◽  
Interstellar Absorption ◽  
Ultraviolet Spectra ◽  
M Stars ◽  
Host Stars ◽  
Stars Flare ◽  
Photochemical Models

AbstractLyman-α radiation dominates the ultraviolet spectra of G, K, and M stars and is a major photodissociation source for H2O, CO2, and CH4 in the upper atmospheres of exoplanets. We obtain intrinsic Lyman-α line fluxes for late-type stars by correcting for interstellar absorption or by scaling from other spectroscopic observables. When stars flare, all emission lines brighten by large factors as shown by HST spectra. We describe photochemical models of the atmosphere of the mini-Neptune GJ 436b (Miguel et al. 2015) that show the effects of flaring Lyman-α fluxes on atmospheric chemical abundances.

The 3.4-µm interstellar absorption feature

Nature ◽  
1980 ◽  
Vol 287 (5782) ◽  
pp. 518-519 ◽  
Author(s):  
D. T. Wickramasinghe ◽  
D. A. Allen
Keyword(s):  
Absorption Feature ◽  
Interstellar Absorption

Carbon Onions: Carriers of the 217.5 nm Interstellar Absorption Feature

2003 ◽  
Vol 90 (15) ◽  
Author(s):  
Manish Chhowalla ◽  
H. Wang ◽  
N. Sano ◽  
K. B. K. Teo ◽  
S. B. Lee ◽  
...  
Keyword(s):  
Absorption Feature ◽  
Interstellar Absorption ◽  
Carbon Onions

scholarly journals The deep 3.4 μm interstellar absorption feature toward the IRAS 18511+0146 cluster

2011 ◽  
Vol 537 ◽  
pp. A27 ◽  
Author(s):  
M. Godard ◽  
T. R. Geballe ◽  
E. Dartois ◽  
G. M. Muñoz Caro
Keyword(s):  
Absorption Feature ◽  
Interstellar Absorption

UV absorption investigation of ferromagnetically filled ultra-thick carbon onions, carriers of the 217.5 nm Interstellar Absorption Feature

2017 ◽  
Vol 122 (22) ◽  
pp. 224305 ◽  
Author(s):  
Filippo S. Boi ◽  
Xiaotian Zhang ◽  
Sameera Ivaturi ◽  
Qianyang Liu ◽  
Jiqiu Wen ◽  
...  
Keyword(s):  
Uv Absorption ◽  
Absorption Feature ◽  
Interstellar Absorption ◽  
Carbon Onions

scholarly journals INTERSTELLAR ABSORPTION TOWARDS THE NOVAE V339 DEL AND V5668 SGR

2019 ◽  
Vol 55 (2) ◽  
pp. 141-149
Author(s):  
D. Jack ◽  
K.-P. Schröder
Keyword(s):  
High Resolution ◽  
Wavelength Range ◽  
Absorption Feature ◽  
Interstellar Absorption ◽  
Absorption Features

We present a search and study of interstellar (IS) absorption features in the observed spectra of two Novae V339 Del and V5668 Sgr. We obtained high resolution spectra (R ≈ 20, 000) in the wavelength range between 3800 and 8800 Å of both novae with the TIGRE telescope. Common IS features of Na I and Ca II were identified in both novae, and the Ca II H and K features of Nova V339 Del show substructures, while a blueshifted absorption feature was found in the spectra of Nova V5668 Sgr. Absorption of K I was identified only in the spectra of Nova V5668 Sgr. The DIBs 6196, 6203, 6379, 6614 and 7562 were found in both novae, and in the spectra of Nova V5668 Sgr we could also identify the DIBs 5780, 5797 and 6660. We present the equivalent widths of all features and determined the column densities of Ca II, K I and hydrogen in the direction of Nova V5668 Sgr (log NCa II = 12.50, log NK I = 11.55, log NH = 18.5).

scholarly journals Fröhlich resonance in carbon nanospiroids and the 2175 Å interstellar absorption feature

2017 ◽  
Vol 393 ◽  
pp. 59-62 ◽  
Author(s):  
Sergey Yastrebov ◽  
Maxim Chekulaev ◽  
Alexandra Siklitskaya ◽  
Jacek A. Majewski ◽  
Roger Smith
Keyword(s):  
Absorption Feature ◽  
Interstellar Absorption
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