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

We present B,V time-series photometry of Andromeda XIX (And XIX), the mostextended (half-light radius of 6.2') of Andromeda's dwarf spheroidalcompanions, that we observed with the Large Binocular Cameras at the LargeBinocular Telescope. We surveyed a 23'x 23' area centered on And XIX andpresent the deepest color magnitude diagram (CMD) ever obtained for thisgalaxy, reaching, at V~26.3 mag, about one magnitude below the horizontalbranch (HB). The CMD shows a prominent and slightly widened red giant branch,along with a predominantly red HB, which, however, extends to the blue tosignificantly populate the classical instability strip. We have identified 39pulsating variable stars, of which 31 are of RR Lyrae type and 8 are AnomalousCepheids (ACs). Twelve of the RR Lyrae variables and 3 of the ACs are locatedwithin And XIX's half light radius. The average period of the fundamental modeRR Lyrae stars (<Pab> = 0.62 d, \sigma= 0.03 d) and the period-amplitudediagram qualify And XIX as an Oosterhoff-Intermediate system. From the averageluminosity of the RR Lyrae stars (<V (RR)> = 25.34 mag, \sigma= 0.10 mag) wedetermine a distance modulus of (m-M)$_0$=$24.52\pm0.23$ mag in a scale wherethe distance to the Large Magellanic Cloud (LMC) is $18.5\pm0.1$ mag. The ACsfollow a well defined Period-Wesenheit (PW) relation that appears to be in verygood agreement with the PW relationship defined by the ACs in the LMC.

Dwarf spheroidal satellites of M31: I. Variable stars and stellar populations in Andromeda XIX