Results 21 to 30 of about 3,822 (305)

Observations of red‐giant variable stars by Aboriginal Australians

open access: yes, 2017
Aboriginal Australians carefully observe the properties and positions of stars, including both overt and subtle changes in their brightness, for subsistence and social application. These observations are encoded in oral tradition.
Duane W. Hamacher, Hamacher, Duane W.
core   +1 more source

Variable stars of long period [PDF]

open access: yesAstronomische Nachrichten, 1906
n ...
openaire   +2 more sources

UBV Observations of Long-Period Variable Stars, VI [PDF]

open access: yesPublications of the Astronomical Society of the Pacific, 1966
Photoelectric observations of 33 long-period and 2 R CrB-type variable stars are presented on the UBV photometric system.
openaire   +2 more sources

A Population of Dipper Stars from the Transiting Exoplanet Survey Satellite Mission

open access: yesThe Astrophysical Journal Supplement Series, 2022
Dipper stars are a classification of young stellar objects that exhibit dimming variability in their light curves, dropping in brightness by 10%–50%, likely induced by occultations due to circumstellar disk material.
Benjamin K. Capistrant   +14 more
doaj   +1 more source

Variability of Known Exoplanet Host Stars Observed by TESS

open access: yesThe Astronomical Journal, 2023
Both direct and indirect methods of exoplanet detection rely upon detailed knowledge of the potential host stars. Such stellar characterization allows for accurate extraction of planetary properties, as well as contributing to our overall understanding ...
Emilie R. Simpson   +5 more
doaj   +1 more source

Hospitalization Through Families’ Eyes: Comparing Inpatient Care Quality for Children With Sickle Cell Disease and Cystic Fibrosis in Canada

open access: yesPediatric Blood &Cancer, EarlyView.
ABSTRACT Background Sickle cell disease (SCD) is a chronic, inherited hemoglobinopathy that requires frequent hospitalization for disease‐related complications. Canadian data on inpatient care is limited. This study compared caregiver‐reported hospital experiences of children with SCD to those with cystic fibrosis (CF), a chronic, autosomal recessive ...
Hailey M. Zwicker   +11 more
wiley   +1 more source

Improved methodology for the automated classification of periodic variable stars

open access: yes, 2019
We present a novel automated methodology to detect and classify periodic variable stars in a large data base of photometric time series. The methods are based on multivariate Bayesian statistics and use a multistage approach. We applied our method to the
Charbonneau, D.   +13 more
core   +1 more source

Period–Luminosity Relations for Double-mode δ Sct Stars

open access: yesThe Astrophysical Journal
Previous studies of the period–luminosity relations (PLRs) of Delta Scuti ( δ Sct) stars have focused on those with a single pulsation mode. However, for δ Sct stars with many different pulsation modes, classifying a single mode is difficult.
Qi Jia   +5 more
doaj   +1 more source

Ap stars with variable periods

open access: yes, 2013
10 pages, 4 figures, contribution for the proceedings of the conference Putting A Stars into Context, June 3-7, 2013, Moscow ...
Mikulášek, Zdeněk   +7 more
openaire   +2 more sources

Period Analysis of Variable Stars by Robust Smoothing

open access: yesJournal of the Royal Statistical Society Series C: Applied Statistics, 2004
SummaryThe objective is to estimate the period and the light curve (or periodic function) of a variable star. Previously, several methods have been proposed to estimate the period of a variable star, but they are inaccurate especially when a data set contains outliers.
Oh, Hee-Seok   +3 more
openaire   +2 more sources

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