| Name: Padmavathy P G |
| Affiliation: Amrita Vishwa Vidyapeetham |
| Conference ID: ASI2026_266 |
| Title: Fundamental parameters and mass function of two young open clusters – Pismis 27 and [IBP 2002] CC04 |
| Abstract Type: Poster |
| Abstract Category: Stars, Interstellar Medium, and Astrochemistry in Milky Way |
| Author(s) and Co-Author(s) with Affiliation: Padmavathy P G(Amrita Vishwa Vidyapeetham, Coimbatore - 641112, India), Krishna Kumar Kowshik(M. P. Birla Institute of Fundamental Research, Bangalore - 560001, India), Sujatha S(M. P. Birla Institute of Fundamental Research, Bangalore - 560001, India) |
| Abstract: We present the preliminary results obtained from the UBVRI photometric study of two young, relatively unexplored open clusters Pismis 27 (NGC 2175s) (α_2000 = 06h 10m 52s, δ_2000 = +20d 36′ 45′′) and [IBP 2002] CC04 (α_2000 = 07h 00m 32s, δ_2000 = –8d 51′ 41′′) based on the observational data collected from the Himalayan Chandra Telescope, Hanle. We used data from Gaia DR3 to identify the cluster members, based on their parallaxes and proper motions. This was done using Bayesian inference and Monte Carlo analysis. We followed standard practices of photometric analysis by plotting two-colour diagrams and colour-magnitude diagrams of the member stars. From these diagrams, we estimated the interstellar reddening E(B-V), distances to the clusters, and their ages by fitting the theoretical isochrones of solar metallicity to the cluster main sequence. We found that Pismis 27 lies at about 1.83 ± 0.15 kpc away, while [IBP 2002] CC04 is at 1.67 ± 0.05 kpc. Their cluster radii are 3.75′ and 3.33′, determined by fitting King’s density profile. The reddening values are E(B-V) = 0.41 ± 0.02 for Pismis 27 and 0.36 ± 0.03 for [IBP 2002] CC04, with average extinction values A_V = 1.27 ± 0.06 and 2.40 ± 0.02, respectively. The logarithmic ages of the clusters respectively are 6.7 ± 0.1 and 7.0 ± 0.3. Using Kroupa’s form of mass function, we obtained the mass function slopes as -2.27 ± 0.46 for Pismis 27 and -2.33 ± 0.17 for Ivanov 4, which agree well with the standard Salpeter slope of -2.35. Interestingly, Pismis 27 is located near the star forming cloud Sh2-252, while [IBP2002] CC04 is relatively isolated. This contrast gives us an opportunity to investigate the nature of mass function in different environments. |
