English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

(Abridged) We present the results of a new search for variable stars in theLocal Group (LG) isolated dwarf galaxy IC1613, based on 24 orbits of F475W andF814W photometry from the ACS camera onboard the HST. We detected 259 candidatevariables in this field, of which only 13 (all of them bright Cepheids) werepreviously known. Out of the confirmed variables, we found 90 RR Lyrae stars,49 classical Cepheids (including 36 new discoveries), and 38 eclipsing binarystars for which we could determine a period. The RR Lyrae include 61fundamental (RRab) and 24 first-overtone (RRc) pulsators, and 5 pulsating inboth modes simultaneously (RRd). As for the majority of LG dwarfs, the meanperiods of the RRab and RRc (0.611 and 0.334 day, respectively) as well as thefraction of overtone pulsators (f_c=0.28) place this galaxy in the intermediateregime between the Oosterhoff types. From their position on theperiod-luminosity diagram and light-curve morphology, we can unambiguouslyclassify 25 and 14 Cepheids as fundamental and first-overtone mode pulsators,respectively. Another two are clearly second-overtone Cepheids, the first onesto be discovered beyond the Magellanic Clouds. We estimate the distance toIC1613 using various methods based on the photometric and pulsationalproperties of the Cepheids and RR Lyrae stars. The values we find are in verygood agreement with each other and with previous estimates based on independentmethods. When corrected to a common reddening of E(B-V)=0.025 and true LMCdistance modulus of (m-M)_{LMC,0}=18.515+-0.085, we find that all the distancedeterminations from the literature converge to a common value of(m-M)_0=24.400+-0.014 (statistical), or 760 kpc.

The ACS LCID Project. II. Faint Variable Stars in the Isolated Dwarf Irregular Galaxy IC1613