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Carbon stars as standard candles - II. The median J magnitude as a distance indicator
Rousseau-Nepton, Laurie; Heyl, Jeremy; Richer, Harvey +2 more
We introduce a new distance determination method using carbon-rich asymptotic giant branch stars (CS) as standard candles and the Large and Small Magellanic Clouds (LMC and SMC) as the fundamental calibrators. We select the samples of CS from the ((J - Ks)0, J0) colour-magnitude diagrams, as, in this combination of…
Observational and Theoretical Studies of 27 δ Scuti Stars with Investigation of the Period-Luminosity Relation
Davoudi, Fatemeh; Poro, Atila; Paki, Ehsan +11 more
The multi-color CCD photometric study of 27 δ Scuti stars is presented. By using approximately three years of photometric observations, we obtained the times of maxima and magnitude changes during the observation time interval for each star. The ephemerides of our δ Scuti stars were calculated based on the Markov Chain Monte Carlo (MCMC) method us…
Gaia GraL: Gaia DR2 Gravitational Lens Systems. VI. Spectroscopic Confirmation and Modeling of Quadruply Imaged Lensed Quasars
Djorgovski, S. G.; Stern, D.; Surdej, J. +23 more
Combining the exquisite angular resolution of Gaia with optical light curves and WISE photometry, the Gaia Gravitational Lenses group (GraL) uses machine-learning techniques to identify candidate strongly lensed quasars, and has confirmed over two dozen new strongly lensed quasars from the Gaia Data Release 2. This paper reports on the 12 quadrupl…
Plasma and Magnetic Field Turbulence in the Earth's Magnetosheath at Ion Scales
Rakhmanova, Liudmila; Riazantseva, Maria; Zastenker, Georgy
Crossing the Earth's bow shock is known to crucially affect solar wind plasma including changes in turbulent cascade. The present review summarizes results of more than 15 years of experimental exploration into magnetosheath turbulence. Great contributions to understanding turbulence development inside the magnetosheath was made by means of recent…
Survey of Gravitationally Lensed Objects in HSC Imaging (SuGOHI) - VII. Discovery and confirmation of three strongly lensed quasars
Schramm, Malte; Sonnenfeld, Alessandro; Oguri, Masamune +13 more
We present spectroscopic confirmation of three new two-image gravitationally lensed quasars, compiled from existing strong lens and X-ray catalogues. Images of HSC J091843.27-022007.5 show a red galaxy with two blue point sources at either side, separated by 2.26 arcsec. This system has a source and a lens redshifts zs = 0.804 and z
The MOSDEF survey: the mass-metallicity relationship and the existence of the FMR at z 1.5
Barro, Guillermo; Siana, Brian; Shapley, Alice E. +16 more
We analyse the rest-optical emission-line ratios of z ~ 1.5 galaxies drawn from the Multi-Object Spectrometer for Infra-Red Exploration Deep Evolution Field (MOSDEF) survey. Using composite spectra, we investigate the mass-metallicity relation (MZR) at z ~ 1.5 and measure its evolution to z = 0. When using gas-phase metallicities based on the N2 l…
On the discovery of stars, quasars, and galaxies in the Southern Hemisphere with S-PLUS DR2
Werle, A.; Mendes de Oliveira, C.; Akras, S. +25 more
This paper provides a catalogue of stars, quasars, and galaxies for the Southern Photometric Local Universe Survey Data Release 2 (S-PLUS DR2) in the Stripe 82 region. We show that a 12-band filter system (5 Sloan-like and 7 narrow bands) allows better performance for object classification than the usual analysis based solely on broad bands (regar…
Relations between the asteroseismic indices and stellar parameters of δ Scuti stars for two years of TESS mission
Hasanzadeh, A.; Safari, H.; Ghasemi, H.
We investigate the relationship between the asteroseismic indices and the physical quantities of 438 δ Scuti (DSCT) stars observed by the Transiting Exoplanet Survey Satellite (TESS) mission at 26 sectors. We study the scaling relations of stellar parameters (effective temperature, surface gravity, density, etc.) and asteroseismic indices such as …
Solar origins of a strong stealth CME detected by Solar Orbiter
Long, David M.; Möstl, Christian; Davies, Emma E. +6 more
Aims: We aim to locate the origin of a stealth coronal mass ejection (CME) detected in situ by the MAG instrument on board Solar Orbiter and make connections between the CME observed at the Sun and the interplanetary CME (ICME) measured in situ.
Methods: Remote sensing data were analysed using advanced image processing techniques to iden…
A stringent upper limit of 20 pptv for methane on Mars and constraints on its dispersion outside Gale crater
Daerden, F.; Forget, F.; Montmessin, F. +17 more
Context. Reports on the detection of methane in the Martian atmosphere have motivated numerous studies aiming to confirm or explain its presence on a planet where it might imply a biogenic or more likely a geophysical origin.
Aims: Our intent is to complement and improve on the previously reported detection attempts by the Atmospheric Chemist…