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“School of Astronomy”

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Paper   IPM / Astronomy / 16127
School of Astronomy
  Title:   The Isaac Newton Telescope monitoring survey of Local Group dwarf galaxies. I. Survey overview and first results for Andromeda I
  Author(s): 
1 . Elham . Saremi
2 . Atefeh . Javadi
3 . Jacco . Th.van Loon
4 . Habib . Khosroshahi
5 . Alireza . Molaeinezhad
6 . Iain . McDonald
7 . Mojtaba . Raouf
8 . Arash . Danesh
9 . James . R. Bamber
10 . Philip . Short
11 . Lucia . Suárez-Andrés
12 . Rosa . Clavero
13 . Ghassem . Gozaliasl
  Status:   Published
  Journal: Astrophysical Journal
  No.:  2
  Vol.:  894
  Year:  2020
  Supported by:            ipm IPM
  Abstract:
An optical monitoring survey in nearby dwarf galaxies was carried out with the 2.5 m Isaac Newton Telescope. Fifty-five dwarf galaxies and four isolated globular clusters in the Local Group were observed with the Wide Field Camera. The main aims of this survey are to identify the most evolved asymptotic giant branch (AGB) stars and red supergiants at the end-point of their evolution based on their pulsational instability, use their distribution over luminosity to reconstruct the star formation history, quantify the dust production and mass loss from modeling the multiwavelength spectral energy distributions (SEDs), and relate this to luminosity and radius variations. In this first of a series of papers, we present the methodology of the variability survey and describe the photometric catalog of the Andromeda I (And I) dwarf galaxy as an example of the survey, and we discuss the identified long period variable (LPV) stars. We detected 5581 stars and identified 59 LPV candidates within two half-light radii of the center of And I. The amplitudes of these candidates range from 0.2 to 3 mag in the i-band. Seventy-five percent of detected sources and 98

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