Results 1 to 10 of about 4,751,007 (301)

Catalog of Integrated-light Star Cluster Light Curves in TESS [PDF]

open access: yesThe Astronomical Journal, 2023
We present the first integrated-light, TESS-based light curves for star clusters in the Milky Way, Small Magellanic Cloud, and Large Magellanic Cloud. We explore the information encoded in these light curves, with particular emphasis on variability.
Tobin M. Wainer   +12 more
doaj   +2 more sources

Photoelectic BV Light Curves of Algol and the Interpretations of the Light Curves [PDF]

open access: yesJournal of Astronomy and Space Sciences, 1985
Standardized B and V photoelectric light curves of Algol are made with the observations obtained during 1982-84 with the 40-cm and the 61-cm reflectors of Yonsei University Observatory.
Ho-Il Kim
doaj   +1 more source

A New Statistical Approach to the Optical Spectral Variability in Blazars

open access: yesGalaxies, 2016
We present a spectral variability study of a sample of about 25 bright blazars, based on optical spectroscopy. Observations cover the period from the end of 2008 to mid 2015, with an approximately monthly cadence.
Jose A. Acosta-Pulido   +3 more
doaj   +1 more source

RobPer: An R Package to Calculate Periodograms for Light Curves Based on Robust Regression

open access: yesJournal of Statistical Software, 2016
An important task in astroparticle physics is the detection of periodicities in irregularly sampled time series, called light curves. The classic Fourier periodogram cannot deal with irregular sampling and with the measurement accuracies that are ...
Anita M. Thieler   +2 more
doaj   +1 more source

SPECTRAL AND PHOTOMETRIC STUDIES OF MRK6 AND MRK1040 IN THE OPTICAL RANGE

open access: yesEurasian Physical Technical Journal
This paper is dedicated to the study of variability in active galactic nuclei, which play a key role in understanding the physical processes occurring in their central regions.
S.A. Shomshekova   +5 more
doaj   +1 more source

Spectral and Photometric Studies of NGC 7469 in the Optical Range

open access: yesUniverse
The galaxy NGC 7469 is a bright infrared source with an active galactic nucleus (AGN) and an intense star-forming region with a radius of approximately 500 parsecs, where the star formation rate is estimated to be 20–50 M⊙yr−1.
Saule Shomshekova   +5 more
doaj   +1 more source

Accurate and Robust Stellar Rotation Periods Catalog for 82771 Kepler Stars Using Deep Learning

open access: yesThe Astronomical Journal
We propose a new framework to predict stellar properties from light curves. We analyze the light-curve data from the Kepler space mission and develop a novel tool for deriving the stellar rotation periods for main-sequence stars.
Ilay Kamai, Hagai B. Perets
doaj   +1 more source

Spin Period Evolution of Decommissioned GLONASS Satellites

open access: yesAerospace
Light curve analysis of defunct satellites is critical for characterizing their rotational motion. An accurate understanding of this aspect will benefit active debris removal and on-orbit servicing missions as part of the solution to the space debris ...
Abdul Rachman   +2 more
doaj   +1 more source

The single beacon: progresses in understanding Earth as an exoplanet using DSCOVR/EPIC observations

open access: yesFrontiers in Remote Sensing
Almost 6000 exoplanets have thus far been confirmed, revolutionizing our understanding of planetary habitability. Yet, despite the identification of Earth-like exoplanets, definitive evidence of extraterrestrial life remains elusive.
Xun Jian   +9 more
doaj   +1 more source

Simple Method of Light Field Calculation for Shaping of 3D Light Curves

open access: yesPhotonics, 2023
We propose a method for generating three-dimensional light fields with given intensity and phase distributions using purely phase transmission functions.
Svetlana N. Khonina   +4 more
doaj   +1 more source

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