Brightest stars of irregular and low-massive spiral galaxies

A search for a correlation between the luminosities of the brightest stars and luminosities of their host galaxies was carried out on archived Hubble Space Telescope (HST) F606W or F555W (V) and F814W (I) images of about 150 nearby galaxies. The sample contains only galaxies with on-going star forma...

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Published in:arXiv.org 2021-12
Main Authors: Tikhonov, Nickolay, Galazutdinova, Olga, Karataeva, Gulnara, Sholukhova, Olga, Ivanov, Valentin, Valcheva, Antoniya, Nedialkov, Petko
Format: Article
Language:English
Subjects:
Dwarf galaxies
Galactic evolution
Galaxy distribution
Hubble Space Telescope
Luminosity
Skewed distributions
Space telescopes
Spiral galaxies
Star & galaxy formation
Star formation
Stars
Stars & galaxies
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container_title arXiv.org
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creator Tikhonov, Nickolay
Galazutdinova, Olga
Karataeva, Gulnara
Sholukhova, Olga
Ivanov, Valentin
Valcheva, Antoniya
Nedialkov, Petko
description A search for a correlation between the luminosities of the brightest stars and luminosities of their host galaxies was carried out on archived Hubble Space Telescope (HST) F606W or F555W (V) and F814W (I) images of about 150 nearby galaxies. The sample contains only galaxies with on-going star formation (SF) and with known distances we derived with the TRGB-method. We correlated the average absolute luminosities of the three brightest blue and the three brightest red stars with the luminosity of a host. We found a linear relation for both the blue and the red stars in irregular and low-mass spiral galaxies. Their scatters are sufficiently small (0.m4) to make this relations useful for distance determination for low-mass galaxies. We found that all 31 dwarf galaxies (M_B>-13m) in our sample lack bright stars (M_V(BS)< -7.m0), probably due to the physical conditions that prevent their birth. For galaxies with higher luminosity in the range -18m
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subjects Dwarf galaxies
Galactic evolution
Galaxy distribution
Hubble Space Telescope
Luminosity
Skewed distributions
Space telescopes
Spiral galaxies
Star & galaxy formation
Star formation
Stars
Stars & galaxies
title Brightest stars of irregular and low-massive spiral galaxies
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