Photometric Study of Open Star Clusters SAI 102 and SAI103


  • Rasha Alghamdi King Abudalaziz University, JEDDAH, Saudi Arabia


Open Clusters, Stars, 2MASS, PPMXL, Photometric, Mass Function, SAI102 and SAI103


The photometrical parameters of two open star clusters SAI 102 and SAI 103 were studied using the near-infrared region JHKs data. The cluster center has been estimated for SAI 102 (?= 09h05m 39.7824s and ? =-37? 52? 29.388??) and for SAI 103(?= 09h 07m 32.75s and ?=-47? 48?13.42??). The astrophysical parameters (reddening, distance, age, etc) hade been obtained from the Color Magnitude Diagram (CMD) for each cluster. The distance from the Sun for these clusters are between 1300 and 1750pc, while the logs (age) for SAI 102 and SAI 103 are 9.7 and 9.4, respectively. Finally, the luminosity and mass functions of these clusters are estimated. The total masses of SAI 102 and SAI 103 are 317.0749 M? and 490.73 M?, respectively, while the mass function slop values were -2.366 and -3.434 for SAI 102 and SAI 103, respectively.


. Y. C. Joshi, A. K. Dambis, A. K. Pandey et al., arXiv:1606.06425v1, 2016.

. Randich, Sofia, and Gerry Gilmore. "The Gaia-ESO Large Public Spectroscopic Survey." The Messenger 154 (2013): 47-49.

. Friel, E. D. (1995). "The old open clusters of the Milky Way." Annual Review of Astronomy and Astrophysics 33.1: 381-414.

. Glushkova E V, Koposov S E, Zolotukhin I Y, Beletsky Y V, Vlasov A D and Leonova S I 2010 Astron. Lett. 36(2) 75.

. Kharchenko, N. V., Piskunov, A. E., Schilbach, E., Röser, S., & Scholz, R. D. (2013). Global survey of star clusters in the Milky Way-II. The catalogue of basic parameters. Astronomy & Astrophysics, 558, A53.

. Buckner, A. S., & Froebrich, D. (2013). Properties of star clusters–I. Automatic distance and extinction estimates. Monthly Notices of the Royal Astronomical Society, 436(2), 1465-1478.

. Joshi, Y. C., Dambis, A. K., Pandey, A. K., & Joshi, S. (2016). Study of open clusters within 1.8 kpc and understanding the Galactic structure. Astronomy & Astrophysics, 593, A116.

. Roeser, Siegfried, Markus Demleitner, and Elena Schilbach. "The PPMXL catalog of positions and proper motions on the ICRS. (2010). Combining USNO-B1. 0 and the Two Micron All Sky Survey (2MASS)." The Astronomical Journal 139.6.

. Elsanhoury, W. H., and Magdy Y. Amin. (2019). "Photometric analysis of newly discovered open clusters SAI 24 and SAI 94 based on PPMXL catalogue." Serbian Astronomical Journal 198: 45-53.

. Haroon, A. A., R. M. Alrehaili, and H. A. Ismail. (2020) "New Optical and Infrared Photometric Study of Young Open Star Cluster NGC 7790." Astrophysics: 1-11.

. Girardi, L., et al. "VizieR Online Data Catalog: Low-mass stars evolutionary tracks & isochrones (Girardi+, 2000)." yCat (2000): J-A+.

. Selim, I. M., et al. (2016). "A comprehensive study of the young open star cluster NGC 6611 based on deep VRI CCD images and 2MASS data." NRIAG Journal of Astronomy and Geophysics 5.1: 16-22.

. Scalo, John M. (1986). "The stellar initial mass function." FCPh 11: 1-278.

. E. E. Salpeter, Astrophys. J., 121, 161, 1955.




How to Cite

Alghamdi, R. . (2021). Photometric Study of Open Star Clusters SAI 102 and SAI103. International Journal of Sciences: Basic and Applied Research (IJSBAR), 57(2), 7–13. Retrieved from