Results 81 to 90 of about 7,202 (193)

A High-Resolution Atlas of Uranium-Neon in the H Band

, 2011
We present a high-resolution (R ~ 50 000) atlas of a uranium-neon (U/Ne) hollow-cathode spectrum in the H-band (1454 nm to 1638 nm) for the calibration of near-infrared spectrographs.
Bean, Brault, Chad F. Bender, Franklyn Quinlan, Gabriel G. Ycas, Gillian Nave, James E. Lawler, Kerber, Kerber, Lawrence W. Ramsey, Mahadevan, Markwardt, Palmer, Pasquini, Ralchenko, Redman, Ryan Terrien, Scott A. Diddams, Stephen L. Redman, Steven N. Osterman, Suvrath Mahadevan, Whaling   +21 more
core   +1 more source

Analysis of microscopy techniques to measure segregation in continuous‐cast steel slabs

Journal of Microscopy, Volume 295, Issue 3, Page 266-277, September 2024.
Summary The accurate characterisation of centreline segregation requires precise measurements of composition variations over large length scales (10−1$^{-1}$ m${\rm {m}}$) across the centreline of the cast product, while having high resolution, sufficient to quantify the significant composition variations between dendrites due to microsegregation at ...
Araf Al Rafi, Begoña Santillana, Renfei Feng, Brian G. Thomas, André B. Phillion   +4 more
wiley   +1 more source

Theoretical efficiency of the Princeton two-element echelle spectrograph [PDF]

Echelle spectrometer for use with spaceborne stellar telescope in Advanced Princeton Satellite ...
Hemstreet, H. S., Markle, D. A., Wissinger, A. B.   +2 more
core   +1 more source

The HARPS-TERRA project I. Description of the algorithms, performance and new measurements on a few remarkable stars observed by HARPS

, 2012
Doppler spectroscopy has uncovered or confirmed all the known planets orbiting nearby stars. Two main techniques are used to obtain precision Doppler measurements at optical wavelengths.
Anglada-Escudé, Guillem, Butler, R. Paul   +1 more
core   +1 more source

DETECTION AND STUDY OF LUMINESCENCE COMETARY CONTINUUM IN SPECTRA OF COMETS SCHAUMASSE (24P), SCORITCHENKO-GEORGE (C/1989 Y1) AND HALE-BOPP (C/1995 O1)

Odessa Astronomical Publications, 2017
The authors investigated spectra of four comets with the aim to determine the real level of the non-solar origin continuum in the spectral region 350-500 nm.
K. I. Churyumov, V. V. Kleshchonok
doaj   +1 more source

The ∼50 Myr Old TOI-942c is Likely on an Aligned, Coplanar Orbit and Losing Mass

The Astronomical Journal
We report the observation of the transiting planet TOI-942c, a Neptunian planet orbiting a young K-type star approximately 50 Myr years old. Using the Keck/High Resolution Echelle Spectrometer, we observed a partial transit of the planet and detected an ...
Huan-Yu Teng, Fei Dai, Andrew W. Howard, Howard Isaacson, Ryan A. Rubenzahl, Isabel Angelo, Alex S. Polanski   +6 more
doaj   +1 more source

Stability analysis of VBT Echelle spectrograph for precise radial velocity measurements

, 2017
A fiber-fed Echelle spectrograph at 2.3 m Vainu Bappu Telescope (VBT), Kavalur, has been in operation since 2005. Owing to various technological advancements in precision spectroscopy in recent years, several research avenues have been opened in ...
Banyal, Ravinder K., Chamarthi, Sireesha, Pandey, Gajendra, Sriram, S.   +3 more
core   +1 more source

The Impact of Observing Cadence and Undetected Companions on the Accuracy of Planet Mass Measurements from Radial Velocity Monitoring

The Astronomical Journal
We conduct experiments on both real and synthetic radial velocity (RV) data to quantify the impact that observing cadence, the number of RV observations, and undetected companions all have on the accuracy of small planet mass measurements.
Joseph M. Akana Murphy, Rafael Luque, Natalie M. Batalha   +2 more
doaj   +1 more source

Novel Calibration Approach for Monitoring Aerosol Hydrogen Isotopes Using Laser-Induced Breakdown Spectroscopy for Molten Salt Reactor Off-Gas Streams. [PDF]

Sensors (Basel), 2023
Andrews HB, McFarlane J.
europepmc   +1 more source

Utilizing Photometry from Multiple Sources to Mitigate Stellar Variability in Precise Radial Velocities: A Case Study of Kepler-21

The Astronomical Journal
We present a new analysis of Kepler-21, the brightest ( V = 8.5) Kepler system with a known transiting exoplanet, Kepler-21 b. Kepler-21 b is a radius valley planet ( R = 1.6 ± 0.2 R _⊕ ) with an Earth-like composition (8.38 ± 1.62 g cm ^–3 ), though its
Corey Beard, Paul Robertson, Mark R. Giovinazzi, Joseph M. Akana Murphy, Eric B. Ford, Samuel Halverson, Te Han, Rae Holcomb, Jack Lubin, Rafael Luque, Pranav Premnath, Chad F. Bender, Cullen H. Blake, Qian Gong, Howard Isaacson, Shubham Kanodia, Dan Li, Andrea S. J. Lin, Sarah E. Logsdon, Emily Lubar, Michael W. McElwain, Andrew Monson, Joe P. Ninan, Jayadev Rajagopal, Arpita Roy, Christian Schwab, Gudmundur Stefansson, Ryan C. Terrien, Jason T. Wright   +28 more
doaj   +1 more source