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Star formation history for the starburst dwarf galaxy in the Local Group, IC 10

Published online by Cambridge University Press:  09 June 2023

Mahtab Gholami Open the ORCID record for Mahtab Gholami [Opens in a new window] ,
Atefeh Javadi Open the ORCID record for Atefeh Javadi [Opens in a new window] ,
Jacco Th. van Loon ,
Habib Khosroshahi  and
Elham Saremi
Mahtab Gholami
Affiliation:
School of Astronomy, Institute for Research in Fundamental Sciences (IPM), Tehran, 19568-36613, Iran email: mhtab.gholami@gmail.com
Atefeh Javadi
Affiliation:
School of Astronomy, Institute for Research in Fundamental Sciences (IPM), Tehran, 19568-36613, Iran email: mhtab.gholami@gmail.com
Jacco Th. van Loon
Affiliation:
Lennard-Jones Laboratories, Keele University, ST5 5BG, UK
Habib Khosroshahi
Affiliation:
School of Astronomy, Institute for Research in Fundamental Sciences (IPM), Tehran, 19568-36613, Iran email: mhtab.gholami@gmail.com
Elham Saremi
Affiliation:
School of Astronomy, Institute for Research in Fundamental Sciences (IPM), Tehran, 19568-36613, Iran email: mhtab.gholami@gmail.com Instituto de Astrofìsica de Canarias, C/ Vìa Làctea s/n, 38205 La Laguna, Tenerife, Spain Departamento de Astrofìsica, Universidad de La Laguna, 38205 La Laguna, Tenerife, Spain
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Abstract

IC 10 as a starburst dwarf galaxy in the Local Group (LG) has a large population of newly formed stars that are massive and intrinsically very bright in comparison with other LG galaxies. Using the Isaac Newton Telescope (INT) with the Wide Field Camera (WFC) in the i-band and V-band, we performed an optical monitoring survey to identify the most evolved asymptotic giant branch stars (AGBs) and red supergiant stars (RSGs) in this star-forming galaxy, which can be used to determine the star formation history (SFH). The E(B - V) as an effective factor for obtaining the precise magnitude of stars is measured for each star using a 2D dust map (SFD98) to obtain a total extinction for each star in both the i-band and V-band. We obtained the photometric catalog for 53579 stars within the area of 0.07 deg2 (13.5 kpc2), of which 762 stars are classified as variable candidates after removing the foreground stars and saturated ones from our catalog. To reconstruct the SFH for IC 10, we first identified 424 long-period variable (LPV) candidates within the area of two half-light radii (2rh) from the center of the galaxy. We estimated the recent star formation rate (SFR) at ∼ 0.32 yr-1 for a constant metallicity Z = 0.0008, showing the galaxy is currently undergoing high levels of star formation. Also, a total stellar mass of is obtained within 2rh for that metallicity.

Keywords

stars: AGBstars: RSGstars: LPVstars: formationgalaxies: dwarfgalaxies: irregulargalaxies: starburstgalaxies: evolutiongalaxies: star formationgalaxies: individual: IC 10
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S373: Resolving the Rise and Fall of Star Formation in Galaxies , August 2021 , pp. 117 - 120
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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