Hedieh Abdollahi

School of Astronomy, Institute for Research in Fundamental Sciences (IPM)

The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies VIII, Detection of the Long Period Variable Stars of Andromeda Dwarf Satellite

Abstract: We present an extensive analysis of spheroidal dwarf satellite galaxies of the Andromeda galaxy, aiming to provide a comprehensive catalog of long-period variable (LPV) stars. This study is part of an optical monitoring survey targeting 55 dwarf galaxies and four globular clusters in the Local Group. Observations were conducted using the Wide Field Camera (WFC) on the 2.5-meter Isaac Newton Telescope (INT) over nine epochs, employing the i-band (Sloan) and V-band (Harris) filters. Our focus is on detecting asymptotic giant branch (AGB) stars with magnitude amplitudes exceeding 0.2 mag to trace the evolution of these dwarf galaxies. The resulting catalog of LPV candidates in Andromeda’s satellite galaxies provides updated characteristics such as half-light radii, TRGB magnitudes, and distance moduli. By applying the Sobel filter, we determine distance moduli for these satellites, ranging from 23.57±0.08 to 25.62±0.17 mag. Given that LPV stars in dwarf galaxies span ages from 30 Myr to 10 Gyr, they serve as valuable probes for reconstructing star formation histories (SFHs). The relationship between LPV birth mass and luminosity at the end of their evolution makes them ideal for studying galaxy properties. This catalog will also facilitate the estimation of quenching times, galaxy masses, and the assessment of mass-loss and dust production in these systems.

یکشنبه  29 مهر 1403، ساعت 17:00

Sunday 20 October 2024 – 17:00 Tehran Time

Hybrid Seminar

دانشکده فیزیک – طبقه اول – کلاس فیزیک 3 Physics Department – first floor – Room Physics 3  / 

https://vc.sharif.edu/ch/cosmology

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