| Name: | Susmita Das |
| Affiliation: | Konkoly Observatory Budapest/ Inter-University Centre for Astronomy and Astrophysics Pune |
| Conference ID: | ASI2025_458 |
| Title: | An updated theoretical scenario of BL Herculis stars |
| Authors: | Susmita Das 1, Laszlo Molnar 1, Robert Szabo 1, Harinder P. Singh 2, Shashi M. Kanbur 3, Anupam Bhardwaj 4, Meridith Joyce 5, Marcella Marconi 6, Vincenzo Ripepi 6, Radoslaw Smolec 7 |
| Authors Affiliation: | 1 Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences, Konkoly-Thege Miklos ut 15-17, H-1121, Budapest, Hungary
2 Department of Physics \& Astrophysics, University of Delhi, Delhi 110007, India
3 Department of Physics, State University of New York Oswego, Oswego, NY 13126, USA
4 Inter-University Center for Astronomy and Astrophysics (IUCAA), Post Bag 4, Ganeshkhind, Pune 411007, India
5 University of Wyoming, 1000 E University Ave, Laramie, WY USA
6 INAF-Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, 80131, Naples, Italy
7 Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, PL-00-716 Warsaw, Poland |
| Mode of Presentation: | Oral |
| Abstract Category: | Stars, Interstellar Medium, and Astrochemistry in Milky Way |
| Abstract: | We present theoretical period-luminosity (PL), period-Wesenheit (PW) amd period-radius (PR) relations at multiple wavelengths (Johnson-Cousin-Glass bands UBVRIJHKLL'M and Gaia passbands GGBPGRP) for a fine grid of convective BL Herculis models computed using the non- linear radial stellar pulsation tool MESA-RSP. The non-linear models were computed for periods typical for BL Her stars, i.e. 1≤P (days)≤4 covering a wide range of input parameters: metallicity (-2.0 dex≤ [Fe/H]≤ 0.0 dex), stellar mass (0.5M ⊙ -0.8M ⊙ ), luminosity (50L ⊙ -300L ⊙ ) and effective temperature (full extent of the instability strip; in steps of 50K). We investigate the impact of four sets of different convection parameters on multi-wavelength properties. Most empirical relations match well with the theoretical PL, PW and PR relations from the BL Her models computed using the four sets of convection parameters. No significant metallicity effects are seen in the PR relations. We carry out a robust light curve optimization technique to obtain the best observed-model pairs for the BL Her stars in the LMC. We also extend our study to include theoretical relations in the Rubin-LSST passbands. In addition, we also explore the mass of the prototype BL Herculis itself using simultaneous fitting of the observed light curve and radial velocity curve with those from the model that exhibits the best goodness-of-fit. |
