Saremi, E, Javadi, A, Loon, JTV ORCID: https://orcid.org/0000-0002-1272-3017, Khosroshahi, H, Molaeinezhad, A, McDonald, I, Raouf, M, Danesh, A, Bamber, JR, Short, P, Suárez-Andrés, L, Clavero, R and Gozaliasl, G (2020) The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. I. Survey Overview and First Results for Andromeda I. Astrophysical Journal, 894 (2).

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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% of LPV candidates are detected at mid-infrared wavelengths. We show evidence for the presence of dust-producing AGB stars in this galaxy including five extreme AGB (x-AGB) stars, and we model some of their SEDs. A distance modulus of 24.41 mag for And I was determined based on the tip of the red giant branch. Also, a half-light radius of 3.′2 ± 0.′3 was calculated.

Item Type: Article
Additional Information: This is the final published version (version of record). It was first published online via IOP Science at https://doi.org/10.3847/1538-4357/ab88a2 - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: Asymptotic giant branch stars, Local Group, Stellar mass loss, Stellar evolution, Luminosity function, Stellar mass functions, Stellar oscillations, Galaxy stellar content, Dwarf galaxies, Surveys, Long period variable stars, Galaxy distances
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Q Science > QB Astronomy > QB799 Stars
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 19 Jun 2020 09:45
Last Modified: 19 Jun 2020 09:45
URI: https://eprints.keele.ac.uk/id/eprint/8202

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