“Mahdieh Navabi”


IPM Positions

Research Assistant , School of Astronomy


Research Interests

Observational Astronomy (photometry, astrometry), Stellar populations, Stellar evolution, Dust production, Star formation and quenching, Dwarf Nearby Galaxies formation and evolution, Stellar feedback, Interstellar Medium, Diffuse Solar Features

Awards

The visiting student in the International Centre for Radio Astronomy Research (ICRAR), Australia, Perth (2019).
Fully grant awarded to participate in Lorentz Center workshop, Astro Hack Week: Data Science for Next-Generation Astronomy, Leiden, Netherlands (2018). Fully grant awarded from DAAD for participating in 5th International Solar Neutrino Conference, TU Dresden, Germany (2018).
MSc Scholarship (2013)
BSc Scholarship (2007)

Research Activities

1) Dynamics and Structure of small-scale Magnetic Features on Solar photosphere (IDL/YAFTA code) Supervisors: Mohammad Taghi Mirtorabi, Shahin Jafarzadeh paper: Statistical and Dynamical Properties of Circular Polarization Features in the Quiet-Sun Internetwork. M. Navabi (2018)- published by World Scientific-Germany-DOI: 10.1142/9789811204296\_0033
2) The star formation history of Andromeda VII derived from long-period variable stars (DAOPHOT/Python/IRAF) Supervisors: Atefeh Javadi, Elham Saremi, Jacco van Loon, Habib
The Isaac Newton Telescope monitoring survey of Local Group dwarf galaxies -- IV. The star formation history of Andromeda VII derived from long-period variable stars. Mahdieh Navabi et al. (2021, Accepted for publication in ApJ, arXiv number: 2101.09900)
FROM MONITORING SURVEY OF VARIABLE RED GIANT STARS TO THE EVOLUTION OF THE GALAXY: ANDROMEDA VII. Mahdieh Navabi et al. (2020)-published by Stars and their variability Observed from Space Conference-Vienna, Austria-Bibcode: 2020svos.conf..383N}{}
THE STAR FORMATION HISTORY OF AND VII DWARF GALAXY DERIVED FROM MONITORING SURVEY OF LONG-PERIOD VARIABLE STARS. Mahdieh Navabi et al. (2020)-IPM journal, Iran-http://particles.ipm.ir/conferences/2020/27thspring/proceedings/Navabi.pdf
INT monitoring survey of Local Group dwarf galaxies: Star formation history and chemical enrichment. T. Parto et al (2020) published by Astronomical Surveys and Big Data 2 (ASBD-2) proceedings, Byurakan Astrophysical Observatory (BAO), Armenia- Bibcode: 2020CoBAO..67..232P
3) To examine resolved properties of low-frequency radio emission of nearby star-forming galaxies starting with NGC7793 (Python/Astropy/SciPy) Supervisor: Ivy Wong

Present Research Project at IPM

We have examined the star formation history (SFH) of Andromeda VII (And VII), the brightest and most massive dwarf spheroidal (dSph) satellite of the Andromeda galaxy (M31). Although M31 is surrounded by several dSph companions with old stellar populations and low metallicity, it has a metal-rich stellar halo with an age of 6�8 Gyr. This indicates that any evolutionary association between the stellar halo of M31 and its dSph system is frail. Therefore, the question is whether And VII (a high-metallicity dSph located ~220 kpc from M 31), can be associated with M 31�s young, metal-rich halo. Here, we perform the first reconstruction of the SFH of AndVII employing long-period variable (LPV) stars. As the most-evolved asymptotic giant branch (AGB) and red supergiant(RSG) stars, the birth mass of LPVs can be determined by connecting their near-infrared photometry to theoretical evolutionary tracks. We found 55 LPV candidates within two half-light radii, using multi-epoch imaging with the Isaac Newton Telescope in the i and V bands. Based on their birth mass function, the star-formation rate (SFR) of And VII was obtained as a function of cosmic time. The main epoch of star formation occurred ? 6.2 Gyr ago with a SFR of 0.006 � 0.002 M? yr-1. Over the past 6 Gyr, we find slow star formation, which continued until 500 Myr ago with a SFR~ 0.0005 � 0.0002 M? yr-1. We determined And VII�s stellar mass M = (13.3 � 5.3) � 106 M? within a half-light radius r = 3.8 � 0.3 arcmin and metallicity Z = 0.0007, and also derived its distance modulus of � = 24.38 mag.

Related Papers

1. Mahdieh . Navabi, Elham . Saremi, Atefeh . Javadi, Majedeh . Noori, Jacco . Th. van Loon, Habib . G. Khosroshahi, Iain . McDonald, Mina . Alizadeh, Arash . Danesh, Ghassem . Gozaliasl, Alireza . Molaeinezhad, Tahere . Parto and Mojtaba . Raouf
The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. IV. The Star Formation History of Andromeda VII Derived from Long-period Variable Stars
ApJ 910 (2021),   [abstract]
Code: IPM/A-2021/02
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