Search Publications
Identifying Li-rich giants from low-resolution spectroscopic survey
Zhao, Gang; Kumar, Yerra Bharat; Reddy, Bacham Eswar
In this paper we discuss our choice of a large unbiased sample used for the survey of red giant branch stars for finding Li-rich K giants, and the method used for identifying Li-rich candidates using low-resolution spectra. The sample has 2000 giants within a mass range of 0.8 to
Structure of sunspot light bridges in the chromosphere and transition region
Rezaei, R.
Context. Light bridges (LBs) are elongated structures with enhanced intensity embedded in sunspot umbra and pores.
Aims: We studied the properties of a sample of 60 LBs observed with the Interface Region Imaging Spectrograph (IRIS).
Methods: Using IRIS near- and far-ultraviolet spectra, we measured the line intensity, width, and Doppler …
Review on the Characteristics of the Current Sheet in the Earth's Magnetotail
Lui, A. T. Y.
The gas and stellar mass of low-redshift damped Lyman-α absorbers
Prochaska, J. Xavier; Neeleman, Marcel; Kanekar, Nissim +1 more
We report Hubble Space Telescope Cosmic Origins Spectrograph far-ultraviolet and Arecibo Telescope H I 21 cm spectroscopy of six damped and sub-damped Lyman-α absorbers (DLAs and sub-DLAs, respectively) at z ≲ 0.1, which have yielded estimates of their H I column density, metallicity and atomic gas mass. This significantly increases the number of …
Stellar parameters of the two binary systems: HIP 14075 and HIP 14230
Al-Wardat, Mashhoor A.; Pathan, J. M.; Masda, Suhail G.
We present the stellar parameters of the individual components of the two old close binary systems HIP 14075 and HIP 14230 using synthetic photometric analysis. These parameters are accurately calculated based on the best match between the synthetic photometric results within three different photometric systems with the observed photometry of the …
Broad-band high-energy emissions of the redback millisecond pulsar PSR J2129-0429
Kong, Albert K. H.; Zhao, J.; Hui, C. Y. +3 more
We present the first results from a joint XMM-Newton and NuSTAR observation of the gamma-ray emitting millisecond pulsar compact binary PSR J2129-0429. X-ray emission up to about 40 keV is detected and the joint spectrum can be modelled with a power-law plus a neutron star atmosphere model. At a distance of 1.4 kpc, the 0.3-79 keV luminosity is 3.…
Banyan. X. Discovery of a Wide, Low-gravity L-type Companion to a Fast-rotating M3 Dwarf
Faherty, Jacqueline K.; Gagné, Jonathan; Doyon, René +4 more
We report the discovery of a substellar-mass co-moving companion to 2MASS J22501512+2325342, an M3 candidate member of the young (130-200 Myr) AB Doradus Moving Group (ABDMG). This L3 β companion was discovered in a 2MASS search for companions at separations of 3″-18″ from a list of 2812 stars suspected to be young (≲500 Myr) in the literature, an…
Discovery of large scale shock fronts correlated with the radio halo and radio relic in the A2163 galaxy cluster
Thölken, Sophia; Reiprich, Thomas H.; Ota, Naomi +1 more
Context. Galaxy clusters form at the intersections of the filamentary large scale structure in merging events and by the accretion of matter along these filaments. Imprints of these formation processes should be visible in the intracluster medium and can arise in shock fronts, which are detectable via discontinuities in, for example, the gas tempe…
The Rosetta Mission and the Chemistry of Organic Species in Comet 67P/Churyumov-Gerasimenko
Engrand, Cécile; Siljeström, Sandra; Wright, Ian P. +1 more
ProtoDESI: First On-Sky Technology Demonstration for the Dark Energy Spectroscopic Instrument
Serrano, Santiago; Weaver, Benjamin A.; Dey, Arjun +38 more
The Dark Energy Spectroscopic Instrument (DESI) is under construction to measure the expansion history of the universe using the baryon acoustic oscillations technique. The spectra of 35 million galaxies and quasars over 14,000 square degrees will be measured during a 5-year survey. A new prime focus corrector for the Mayall telescope at Kitt Peak…