TY - JOUR
T1 - Multi-wavelength photometric study of five contact binaries in the field of globular cluster M4
AU - Devarapalli, Shanti Priya
AU - Jagirdar, Rukmini
AU - Pothuneni, Ravi Raja
AU - Amente, Dereje Wakgari
AU - Thomas, Vineet
AU - Safonova, Margarita
AU - Brosch, Noah
N1 - Publisher Copyright:
© 2023
PY - 2024/4
Y1 - 2024/4
N2 - Binary stars are believed to be key determinants in understanding globular cluster evolution. In this paper, we present the Multi-band photometric analyses of five variables in the nearest galactic globular cluster M4, from the observations of CASE, M4 Core Project with HST for four variables (V48, V49, V51, and V55) and the data collected from T40 and C18 Telescopes of Wise Observatory for one variable (NV4). The light curves of five binaries are analysed using the Wilson–Devinney method (WD) and their fundamental parameters have been derived. A period variation study was carried out using times of minima obtained from the literature for four binaries and the nature of the variation observed is discussed. The evolutionary state of systems is evaluated using M-R diagram, correlating with that of a few well-studied close binaries in other globular clusters. Based on the data obtained from the Gaia DR3 database, a three-dimensional Vector-Point Diagrams (VPD) was built to evaluate the cluster membership of the variables, and two out of them (V49 and NV4) were found to be not cluster members.
AB - Binary stars are believed to be key determinants in understanding globular cluster evolution. In this paper, we present the Multi-band photometric analyses of five variables in the nearest galactic globular cluster M4, from the observations of CASE, M4 Core Project with HST for four variables (V48, V49, V51, and V55) and the data collected from T40 and C18 Telescopes of Wise Observatory for one variable (NV4). The light curves of five binaries are analysed using the Wilson–Devinney method (WD) and their fundamental parameters have been derived. A period variation study was carried out using times of minima obtained from the literature for four binaries and the nature of the variation observed is discussed. The evolutionary state of systems is evaluated using M-R diagram, correlating with that of a few well-studied close binaries in other globular clusters. Based on the data obtained from the Gaia DR3 database, a three-dimensional Vector-Point Diagrams (VPD) was built to evaluate the cluster membership of the variables, and two out of them (V49 and NV4) were found to be not cluster members.
KW - Binaries: Contact
KW - Cluster
KW - Mass-ratio
KW - Orbital period: Variation
UR - http://www.scopus.com/inward/record.url?scp=85175714891&partnerID=8YFLogxK
U2 - 10.1016/j.newast.2023.102150
DO - 10.1016/j.newast.2023.102150
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AN - SCOPUS:85175714891
SN - 1384-1076
VL - 107
JO - New Astronomy
JF - New Astronomy
M1 - 102150
ER -