Release 11.12 ("Hergest Ridge")


Gclusters :: Bibliographic item "gc561"

Article ID: gc561
AuthorViolat-Bordonau, F.
TitleStudy of the variable stars V10 and C6 in Messier 13
JournalOpen European Journal on Variable Stars
Year of publication2024 (on gclusters from 2024-02-07 16:05:09 )
AbstractWe have studied the variable star V10 and the new variable candidate C6 (announced in 2019), located in Messier 13, using the filtered CCD images -in the V band obtained in the campaigns of 2019, 2020 and 2021. We have previously determined their precise alpha and delta coordinates (J2000) to identify them in a crowded field. We find the V10 constant in light in the three campaigns: the star is listed in the Catalogue of Variable Stars in Globular Clusters as non-variable. C6 has presented low-level variations from 0.102 to 0.138 mag without regularity; these values are lower than 0.44 mag in the V band detected by its discoverers. Although we find different periods, none draw a coherent light curve. We have also analysed the photometric measurements obtained by ASAS-SN between 2019 and 2023 in the SLOAN-g band, identifying oscillations with a maximum amplitude equal to 0.188 mag. However, we find two possible periods, none producing a quality light curve. All data suggest that C6 is a new variable star of type L, irregular because no single period fits all of the data: we propose the name V65 for it.
TagsNGC 6205

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