گروه کیهان‌شناسی

Gravitational microlensing and pulsing stars

صدیقه سجادیان

Sedighe Sajadian

Department of physics, Isfahan University of Technology (IUT)

Abstract: Gravitational microlensing refers to the temporary enhancement in the stellar brightness due to the gravitational effect of a collinear massive object. In this talk, I will explain the microlensing of pulsing stars. Discerning and characterizing the properties of distant, faint pulsating stars are achievable through high-cadence microlensing observations. Mutually, combining stellar variability period with microlensing gives the source distance, type, and radius and helps better determine the lens parameters. For radial pulsing stars, considering periodically variations in their radius and surface temperature, their microlensing light curves are resulted from multiplication of the magnification factor with variable finite size effect by the intrinsic brightness curves of the pulsing source. Whereas, for non-radial pulsing stars, the light curve is not a simple multiplication of the magnification curve and the interstice luminosity curve of the source star, unless the effect of finite source size can be ignored. Other properties of microlensing light curves from pulsing stars will be discussed in the talk.

یکشنبه 29 تیر 1399، ساعت 17:00

Sunday 19 July, 2020 – 17:00 Tehran Time

اتاق سمینار مجازی –Virtual Seminar Room

https://vclass.ecourse.sharif.edu/ch/cosmology

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