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Year 2024, Volume: 2 Issue: 1, 1 - 17, 11.06.2024
https://doi.org/10.26650/PAR.2024.00002

Abstract

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SED Analysis of the Old Open Cluster NGC 188

Year 2024, Volume: 2 Issue: 1, 1 - 17, 11.06.2024
https://doi.org/10.26650/PAR.2024.00002

Abstract

In this study, we investigate the fundamental astrophysical parameters of the old open cluster NGC 188 using two complementary methods: isochron fitting and spectral energy distribution (SED) analysis. Using photometric, astrometric, and spectroscopic data from the Gaia Data Release 3 (DR3, Gaia Collaboration et al. 2023), we identified 868 most likely member stars with membership probabilities 𝑃 ≥ 0.5. The mean proper-motion components and trigonometric parallaxes of the cluster are derived as (𝜇𝛼 cos 𝛿, 𝜇𝛿) = (-2.314±0.002, -1.022±0.002) mas yr−1 and 𝜛 = 0.550±0.023 mas, respectively. From this initial selection of high probable member stars, we proceed with the determination of astrophysical parameters using the isochron-fitting method. Simultaneously estimating the colour excess, distance and age of the cluster, we employe PARSEC isochrones to observational data on Gaia based colour-magnitude diagrams. These findings were obtained as 𝐸(𝐺BP − 𝐺RP) = 0.066 ± 0.012 mag, 𝑑 = 1806 ± 21 pc, and 𝑡 = 7.65 ± 1.00 Gyr, respectively. In addition, we identified and detected 19 previously confirmed blue straggler stars within NGC 188. Subsequently, we performed SED analyses for 412 of the 868 cluster members. We obtained colour excess, distance and age of the cluster as 𝐸(𝐵 −𝑉) = 0.034±0.030 mag, 𝑑 = 1854±148 pc, and 𝑡 = 7.78±0.23 Gyr, respectively. The analysis of member stars revealed patterns of extinction in the 𝑉-band, with higher values of 𝐴V observed in the lower right quadrant of the cluster. By comparing our SED analysis results with models of stellar evolution, particularly in terms of temperature and surface gravity, we confirm agreement with theoretical predictions. This comprehensive investigation sheds light on the astrophysical properties of NGC 188, contributing to our understanding of stellar evolution within open clusters.

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There are 100 citations in total.

Details

Primary Language English
Subjects Classical Physics (Other)
Journal Section Research Articles
Authors

Deniz Cennet Dursun 0000-0001-7940-3731

Seval Taşdemir 0000-0003-1339-9148

Seliz Koç 0000-0001-7420-0994

Srishti Iyer 0009-0001-5220-0034

Publication Date June 11, 2024
Submission Date March 15, 2024
Acceptance Date April 18, 2024
Published in Issue Year 2024 Volume: 2 Issue: 1

Cite

APA Dursun, D. C., Taşdemir, S., Koç, S., Iyer, S. (2024). SED Analysis of the Old Open Cluster NGC 188. Physics and Astronomy Reports, 2(1), 1-17. https://doi.org/10.26650/PAR.2024.00002
AMA Dursun DC, Taşdemir S, Koç S, Iyer S. SED Analysis of the Old Open Cluster NGC 188. Physics and Astronomy Reports. June 2024;2(1):1-17. doi:10.26650/PAR.2024.00002
Chicago Dursun, Deniz Cennet, Seval Taşdemir, Seliz Koç, and Srishti Iyer. “SED Analysis of the Old Open Cluster NGC 188”. Physics and Astronomy Reports 2, no. 1 (June 2024): 1-17. https://doi.org/10.26650/PAR.2024.00002.
EndNote Dursun DC, Taşdemir S, Koç S, Iyer S (June 1, 2024) SED Analysis of the Old Open Cluster NGC 188. Physics and Astronomy Reports 2 1 1–17.
IEEE D. C. Dursun, S. Taşdemir, S. Koç, and S. Iyer, “SED Analysis of the Old Open Cluster NGC 188”, Physics and Astronomy Reports, vol. 2, no. 1, pp. 1–17, 2024, doi: 10.26650/PAR.2024.00002.
ISNAD Dursun, Deniz Cennet et al. “SED Analysis of the Old Open Cluster NGC 188”. Physics and Astronomy Reports 2/1 (June 2024), 1-17. https://doi.org/10.26650/PAR.2024.00002.
JAMA Dursun DC, Taşdemir S, Koç S, Iyer S. SED Analysis of the Old Open Cluster NGC 188. Physics and Astronomy Reports. 2024;2:1–17.
MLA Dursun, Deniz Cennet et al. “SED Analysis of the Old Open Cluster NGC 188”. Physics and Astronomy Reports, vol. 2, no. 1, 2024, pp. 1-17, doi:10.26650/PAR.2024.00002.
Vancouver Dursun DC, Taşdemir S, Koç S, Iyer S. SED Analysis of the Old Open Cluster NGC 188. Physics and Astronomy Reports. 2024;2(1):1-17.