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 revisited the short period Type II Cepheids (T2Cs), called the BL Herculis(BLHs), in the Galactic Field to derive a homogeneous analysis of their Fourierparameters. Only V-band data were compiled to make sure that it was directlycomparable between the known variables of the OGLE-III catalogue and the 59individual objects classified as short period Type II Cepheids in the GeneralCatalogue of Variable Stars (GCVS) we had in our sample. The derived Fourierparameters were used to make the distinction between different classes ofvariables. From the 59 stars we found 19 BLHs, 19 fundamental mode AnomalousCepheids (ACs) (8 of them were already known from the Catalina Sky Survey(CSS)), 1 first overtone AC, 2 were found to be possible peculiar W Virginis(pWVir), 11 classical Cepheids (DCEPs), and 7 stars were not pulsatingvariables at all. As a result we created a list of bright BLH stars in theGalactic Field, and separated the ACs, as well as other objects that weremisclassified. The number of true BLHs decreased in our sample by more than50%. We gathered the metallicity from spectroscopic measurements published inthe literature. While the number of actual measurements is low, it is highlysuggestive that ACs are metal poor. The mean metallicity from 8 measurements in4 stars (UY Eri having 5 different [Fe/H] data points) is -1.12 dex, but if thehigher value metallicity outliers of UY Eri are left out the mean metallicitybecomes -1.88 dex, regardless if the AC is in the Milky Way itself or in acluster. On the other hand, BLHs seem to have a Solar-like metallicity of 0 dexaveraged from 21 measurements of 10 stars.

Anomalous Cepheids discovered in a sample of Galactic short period Type II Cepheids