Results 11 to 20 of about 19,435 (235)

Revisiting ϵ Eridani with NEID: Identifying New Activity-sensitive Lines in a Young K Dwarf Star

The Astronomical Journal, 2023
Recent improvements in the sensitivity and precision of the radial velocity (RV) method for exoplanets have brought it close, but not quite to, the threshold (∼10 cm s ^−1 ) required to detect Earth-mass and other potentially habitable planets around Sun-
Sarah Jiang, Arpita Roy, Samuel Halverson, Chad F. Bender, Carlos Selgas, O. Justin Otor, Suvrath Mahadevan, Guđmundur Stefánsson, Ryan C. Terrien, Christian Schwab   +9 more
doaj   +1 more source

Retrieval of atmospheric CO₂ vertical profiles from ground-based near-infrared spectra [PDF]

Atmospheric Measurement Techniques, 2021
We evaluate vertical profile retrievals of CO2 from 0.02 cm−1 resolution ground-based near-infrared solar absorption spectra with the GFIT2 algorithm, using improved spectroscopic line lists and line shapes.
S. Roche, K. Strong, D. Wunch, J. Mendonca, C. Sweeney, B. Baier, B. Baier, S. C. Biraud, J. L. Laughner, G. C. Toon, B. J. Connor   +10 more
doaj   +1 more source

GOSAT-2014 methane spectral line list

Journal of Quantitative Spectroscopy and Radiative Transfer, 2015
Abstract The updated methane spectral line list GOSAT-2014 for the 5550–6240 cm −1 region with the intensity cutoff of 5×10 –25  cm/molecule at 296 K is presented. The line list is based on the extensive measurements of the methane spectral line parameters performed at different temperatures and pressures of methane without and with buffer gases N 2
Nikitin, Andrei V., Mikhailenko, Semen N., Perevalov, Valery I., Filippov, N. N., Grigoriev, I. M., Morino, I., Yoshida, Y., Matsunaga, T., Lyulin, Oleg M.   +8 more
openaire   +2 more sources

The Optical Spectral Line List of RR Telescopii

The Astrophysical Journal Supplement Series, 1997
The symbiotic nova RR Telescopii has been observed with the 1.5 m telescope of the Cerro Tololo Inter-American Observatory (CTIO), using the 1.5 m bench-mounted echelle spectrograph in conjunction with a Tektronix CCD. It displays a rich emission-line spectrum, ranging in excitation from O I to [Ni VIII].
F. C. McKenna, F. P. Keenan, N. C. Hambly, C. Allende Prieto, W. R. J. Rolleston, L. H. Aller, W. A. Feibelman   +6 more
openaire   +1 more source

An upper limit for water dimer absorption in the 750 nm spectral region and a revised water line list [PDF]

Atmospheric Chemistry and Physics, 2010
Abstract. Absorption of solar radiation by water dimer molecules in the Earth's atmosphere has the potential to act as a positive feedback effect for climate change. There seems little doubt from the results of previous laboratory and theoretical studies that significant concentrations of the water dimer should be present in the atmosphere, yet ...
Shillings, A.J.L., Ball, S.M., Barber, M.J., Tennyson, J., Jones, R.L.   +4 more
openaire   +4 more sources

An improved ultraviolet spectral line list for the symbiotic star RR Telescopii

The Astrophysical Journal Supplement Series, 1993
We have remeasured wavelengths and intensities of International Ultraviolet Explorer (IUE) spectra of the symbiotic star, RR Tel. The main work is centered on the long 820 minute exposure high-resolution spectrum obtained on 1983 June 18. The list is intended to serve as a source of improved intensities and wavelengths for the ultraviolet spectrum of ...
G. A. Doschek, W. A. Feibelman
openaire   +1 more source

ANALYSIS OF THE SPECTRAL ENERGY DISTRIBUTION OFTHE COOLEST RCrB TYPE CARBON STAR DY Per

Odessa Astronomical Publications, 2008
We analysed the spectral energy distribution of the evolved carbon star DY Per by spectral synthesis technique. The red giant shows the photometric features of R CrB type stars.
L. A. Yakovina, A. V. Shavrina, Ya. V. Pavlenko, A. F. Pugach   +3 more
doaj   +1 more source

An Updated Line List for NUV Spectral Synthesis in Evolved Stars: Redetermination of the Beryllium Abundance in the Solar Photosphere [PDF]

The Astrophysical Journal, 2018
Abstract Motivated by the desire to measure beryllium abundances in red giant stars, we have constructed a new line list for synthesizing spectra in the near-ultraviolet. Using the Sun, Arcturus, and Pollux as benchmark stars, we explore potential sources of missing continuous opacity and line absorption.
Joleen K. Carlberg, Katia Cunha, Verne V. Smith, José-Dias do Nascimento   +3 more
openaire   +1 more source

Infrared Spectra of Small Radicals for Exoplanetary Spectroscopy: OH, NH, CN and CH: The State of Current Knowledge

Molecules, 2023
In this study, we present a current state-of-the-art review of middle-to-near IR emission spectra of four simple astrophysically relevant molecular radicals—OH, NH, CN and CH.
Svatopluk Civiš, Adam Pastorek, Martin Ferus, Sergei N. Yurchenko, Noor-Ines Boudjema   +4 more
doaj   +1 more source

A solar spectral line list between 10 and 200 A modified for application to high spectral resolution X-ray astronomy

The Astrophysical Journal Supplement Series, 1984
A spectral line list for the 10-200 A range is developed from existing solar spectra for application to high spectral resolution measurements of astrophysical plasmas. The solar spectral line lists are merged into a single comprehensive list. The effect of the solar emission measure distribution is removed from the line intensities, which results in a ...
G. A. Doschek, R. D. Cowan
openaire   +1 more source