The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. V. The Star Formation History of Sagittarius Dwarf Irregular Galaxy Derived from Long-period Variable Stars Article Swipe
Tahere Parto
,
Shahrzad Dehghani
,
Atefeh Javadi
,
Elham Saremi
,
J. Th. van Loon
,
Habib G. Khosroshahi
,
Iain McDonald
,
Mohammad Taghi Mirtorabi
,
M. Navabi
,
Maryam Saberi
·
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.3847/1538-4357/aca471
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.3847/1538-4357/aca471
We conducted an optical monitoring survey of the Sagittarius dwarf irregular galaxy (SagDIG) during the period of 2016 June–2017 October, using the 2.5 m Isaac Newton Telescopeat La Palama. Our goal was to identify long-period variable stars (LPVs), namely, asymptotic giant branch stars (AGBs) and red supergiant stars, to obtain the star formation history of isolated, metal-poor SagDIG. For our purpose, we used a method that relies on evaluating the relation between luminosity and the birth mass of these most evolved stars. We found 27 LPV candidates within 2 half-light radii of SagDIG. 10 LPV candidates were in common with previous studies, including one extreme-AGB (x-AGB). By adopting the metallicity Z = 0.0002 for older populations and Z = 0.0004 for younger ages, we estimated that the star formation rate changes from 0.0005 ± 0.0002 M ⊙ yr −1 kpc −2 (13 Gyr ago) to 0.0021 ± 0.0010 M ⊙ yr −1 kpc −2 (0.06 Gyr ago). Like many dwarf irregular galaxies, SagDIG has had continuous star formation activity across its lifetime, though with different rates, and experiences an enhancement of star formation since z ≃ 1. We also evaluated the total stellar mass within 2 half-light radii of SagDIG for three choices of metallicities. For metallicity Z = 0.0002 and 0.0004, we estimated the stellar mass M * = (5.4 ± 2.3) × 10 6 and (3.0 ± 1.3) × 10 6 M ⊙ , respectively. Additionally, we determined a distance modulus of μ = 25.27 ± 0.05 mag, using the tip of the red giant branch.
Related Topics
Concepts
Physics
Sagittarius
Astrophysics
Dwarf galaxy
Astronomy
Local Group
Dwarf spheroidal galaxy
Galaxy
Irregular galaxy
Variable star
Stars
Interacting galaxy
Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.3847/1538-4357/aca471
- https://iopscience.iop.org/article/10.3847/1538-4357/aca471/pdf
- OA Status
- gold
- Cited By
- 5
- References
- 54
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4313580487
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4313580487Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.3847/1538-4357/aca471Digital Object Identifier
- Title
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The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. V. The Star Formation History of Sagittarius Dwarf Irregular Galaxy Derived from Long-period Variable StarsWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2023Year of publication
- Publication date
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2023-01-01Full publication date if available
- Authors
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Tahere Parto, Shahrzad Dehghani, Atefeh Javadi, Elham Saremi, J. Th. van Loon, Habib G. Khosroshahi, Iain McDonald, Mohammad Taghi Mirtorabi, M. Navabi, Maryam SaberiList of authors in order
- Landing page
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https://doi.org/10.3847/1538-4357/aca471Publisher landing page
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https://iopscience.iop.org/article/10.3847/1538-4357/aca471/pdfDirect link to full text PDF
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YesWhether a free full text is available
- OA status
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goldOpen access status per OpenAlex
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https://iopscience.iop.org/article/10.3847/1538-4357/aca471/pdfDirect OA link when available
- Concepts
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Physics, Sagittarius, Astrophysics, Dwarf galaxy, Astronomy, Local Group, Dwarf spheroidal galaxy, Galaxy, Irregular galaxy, Variable star, Stars, Interacting galaxyTop concepts (fields/topics) attached by OpenAlex
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5Total citation count in OpenAlex
- Citations by year (recent)
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2025: 3, 2024: 1, 2023: 1Per-year citation counts (last 5 years)
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54Number of works referenced by this work
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10Other works algorithmically related by OpenAlex
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