STELLAR POPULATIONS AND THE STAR FORMATION HISTORIES OF LSB GALAXIES. V. WFC3 COLOR–MAGNITUDE DIAGRAMS

Schombert, James; McGaugh, Stacy

doi:10.1088/0004-6256/150/3/72

Title: STELLAR POPULATIONS AND THE STAR FORMATION HISTORIES OF LSB GALAXIES. V. WFC3 COLOR–MAGNITUDE DIAGRAMS

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Abstract

We present WFC3 observations of three low surface brightness (LSB) galaxies from the Schombert et al. LSB catalog that are within 11 Mpc of the Milky Way. Deep imaging at F336W, F555W, and F814W allow the construction of the V − I color–magnitude diagrams (CMD) to M{sub I} = −2. Overall 1869, 465, and 501 stellar sources are identified in the three LSB galaxies F415-3, F608-1, and F750-V1, respectively. The spatial distribution of young blue stars matches the Hα maps from ground-based imaging, indicating that star formation in LSB galaxies follows the same style as in other irregular galaxies. Several star complexes are identified, matching regions of higher surface brightness as seen from ground-based imaging. The CMD for each LSB galaxy has a similar morphology to Local Volume (LV) dwarf galaxies (i.e., a blue main sequence, blue and red He burning branches, and asymptotic giant branch (AGB) stars). The LSB CMD’s distinguish themselves from nearby dwarf CMD’s by having a higher proportion of blue main sequence stars and fewer AGB stars than expected from their mean metallicities. Current [Fe/H] values below −0.6 are deduced from the position of the red helium-burning branch (rHeB) stars in the V − I diagram.more »« less

Authors:

Schombert, James ^[1]; McGaugh, Stacy ^[2]

Department of Physics, University of Oregon, Eugene, OR 97403 (United States)
Department of Astronomy, Case Western Reserve University, Cleveland, OH 44106 (United States)

Publication Date:: Tue Sep 15 00:00:00 EDT 2015

OSTI Identifier:: 22520158

Resource Type:: Journal Article

Journal Name:: Astronomical Journal (Online)

Additional Journal Information:: Journal Volume: 150; Journal Issue: 3; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1538-3881

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASYMPTOTIC SOLUTIONS; BRIGHTNESS; CATALOGS; COLOR; DIAGRAMS; GIANT STARS; HELIUM BURNING; HYDROGEN; IRON; MAIN SEQUENCE STARS; METALLICITY; MILKY WAY; MORPHOLOGY; SPATIAL DISTRIBUTION; SURFACES

Citation Formats


                    Schombert, James, and McGaugh, Stacy. STELLAR POPULATIONS AND THE STAR FORMATION HISTORIES OF LSB GALAXIES. V. WFC3 COLOR–MAGNITUDE DIAGRAMS.  United States: N. p., 2015. 
        Web.  doi:10.1088/0004-6256/150/3/72.

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                    Schombert, James, & McGaugh, Stacy. STELLAR POPULATIONS AND THE STAR FORMATION HISTORIES OF LSB GALAXIES. V. WFC3 COLOR–MAGNITUDE DIAGRAMS.  United States.  https://doi.org/10.1088/0004-6256/150/3/72

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                    Schombert, James, and McGaugh, Stacy. 2015.  
        "STELLAR POPULATIONS AND THE STAR FORMATION HISTORIES OF LSB GALAXIES. V. WFC3 COLOR–MAGNITUDE DIAGRAMS".  United States.  https://doi.org/10.1088/0004-6256/150/3/72.

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@article{osti_22520158,

  title        = {STELLAR POPULATIONS AND THE STAR FORMATION HISTORIES OF LSB GALAXIES. V. WFC3 COLOR–MAGNITUDE DIAGRAMS},

  author       = {Schombert, James and McGaugh, Stacy},

  abstractNote = {We present WFC3 observations of three low surface brightness (LSB) galaxies from the Schombert et al. LSB catalog that are within 11 Mpc of the Milky Way. Deep imaging at F336W, F555W, and F814W allow the construction of the V − I color–magnitude diagrams (CMD) to M{sub I} = −2. Overall 1869, 465, and 501 stellar sources are identified in the three LSB galaxies F415-3, F608-1, and F750-V1, respectively. The spatial distribution of young blue stars matches the Hα maps from ground-based imaging, indicating that star formation in LSB galaxies follows the same style as in other irregular galaxies. Several star complexes are identified, matching regions of higher surface brightness as seen from ground-based imaging. The CMD for each LSB galaxy has a similar morphology to Local Volume (LV) dwarf galaxies (i.e., a blue main sequence, blue and red He burning branches, and asymptotic giant branch (AGB) stars). The LSB CMD’s distinguish themselves from nearby dwarf CMD’s by having a higher proportion of blue main sequence stars and fewer AGB stars than expected from their mean metallicities. Current [Fe/H] values below −0.6 are deduced from the position of the red helium-burning branch (rHeB) stars in the V − I diagram. The distribution of stars on the blue helium-burning branch (bHeB) and rHeB from the U − V and V − I CMD indicate a history of constant star formation for the last 100 Myr.},

  doi          = {10.1088/0004-6256/150/3/72},

  url          = {https://www.osti.gov/biblio/22520158},
  journal      = {Astronomical Journal (Online)},

  issn         = {1538-3881},

  number       = 3,

  volume       = 150,

  place        = {United States},

  year         = {Tue Sep 15 00:00:00 EDT 2015},

  month        = {Tue Sep 15 00:00:00 EDT 2015}

}

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