Stellar populations and the local group membership of the dwarf galaxy DDO 210

Myung Gyoon Lee, Antonio Aparicio, Nikolay Tikonov, Yong Ik Byun, Eunhyeuk Kim

Research output: Contribution to journalArticle

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Abstract

We present deep BVI CCD photometry of the stars in the dwarf galaxy DDO 210. The color-magnitude diagrams of DDO 210 show a well-defined red giant branch (RGB) and a blue plume. The tip of the RGB is found to be at ITRGB = 20.95 ± 0.10 mag. From this, the distance to DDO 210 is estimated to be d = 950 ± 50 kpc. The corresponding distance of DDO 210 to the center of the Local Group is 870 kpc, showing that it is a member of the Local Group. The mean metallicity of the RGB stars is estimated to be [Fe/H] = -1.9 ± 0.1 dex. Integrated magnitudes of DDO 210 within the Holmberg radius (rH = 110″ = 505 pc) are derived to be MB = -10.6 ± 0.1 and MV = -10.9 ± 0.1 mag. B and V surface brightness profiles of DDO 210 are approximately consistent with an exponential law with scale lengths rs(B) = 161 and rs(V) = 175 pc. The brightest blue and red stars in DDO 210 (BSG and RSG) are found to be among the faintest in the nearby galaxies with young stellar populations: 〈MV(3)〉BSG = -3.47 ± 0.11 and 〈MV(3)〉RSG = -4.75 ± 0.13 mag. An enhancement of the star formation rate in the recent past (several hundred Myr) is observed in the central region of DDO 210. The opposite trend is observed in the outer region of the galaxy, suggesting a possible two-component structure of the disk/halo kind found in spiral galaxies. The real nature of this two-component structure must, however, be confirmed with more detailed observations.

Original languageEnglish
Pages (from-to)853-861
Number of pages9
JournalAstronomical Journal
Volume118
Issue number2
DOIs
Publication statusPublished - 1999 Aug

Fingerprint

dwarf galaxies
stars
young population
galaxies
blue stars
plume
color-magnitude diagram
diagram
spiral galaxies
star formation rate
metallicity
plumes
photometry
halos
charge coupled devices
brightness
trends
radii
augmentation
profiles

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Lee, Myung Gyoon ; Aparicio, Antonio ; Tikonov, Nikolay ; Byun, Yong Ik ; Kim, Eunhyeuk. / Stellar populations and the local group membership of the dwarf galaxy DDO 210. In: Astronomical Journal. 1999 ; Vol. 118, No. 2. pp. 853-861.
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abstract = "We present deep BVI CCD photometry of the stars in the dwarf galaxy DDO 210. The color-magnitude diagrams of DDO 210 show a well-defined red giant branch (RGB) and a blue plume. The tip of the RGB is found to be at ITRGB = 20.95 ± 0.10 mag. From this, the distance to DDO 210 is estimated to be d = 950 ± 50 kpc. The corresponding distance of DDO 210 to the center of the Local Group is 870 kpc, showing that it is a member of the Local Group. The mean metallicity of the RGB stars is estimated to be [Fe/H] = -1.9 ± 0.1 dex. Integrated magnitudes of DDO 210 within the Holmberg radius (rH = 110″ = 505 pc) are derived to be MB = -10.6 ± 0.1 and MV = -10.9 ± 0.1 mag. B and V surface brightness profiles of DDO 210 are approximately consistent with an exponential law with scale lengths rs(B) = 161 and rs(V) = 175 pc. The brightest blue and red stars in DDO 210 (BSG and RSG) are found to be among the faintest in the nearby galaxies with young stellar populations: 〈MV(3)〉BSG = -3.47 ± 0.11 and 〈MV(3)〉RSG = -4.75 ± 0.13 mag. An enhancement of the star formation rate in the recent past (several hundred Myr) is observed in the central region of DDO 210. The opposite trend is observed in the outer region of the galaxy, suggesting a possible two-component structure of the disk/halo kind found in spiral galaxies. The real nature of this two-component structure must, however, be confirmed with more detailed observations.",
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Stellar populations and the local group membership of the dwarf galaxy DDO 210. / Lee, Myung Gyoon; Aparicio, Antonio; Tikonov, Nikolay; Byun, Yong Ik; Kim, Eunhyeuk.

In: Astronomical Journal, Vol. 118, No. 2, 08.1999, p. 853-861.

Research output: Contribution to journalArticle

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T1 - Stellar populations and the local group membership of the dwarf galaxy DDO 210

AU - Lee, Myung Gyoon

AU - Aparicio, Antonio

AU - Tikonov, Nikolay

AU - Byun, Yong Ik

AU - Kim, Eunhyeuk

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N2 - We present deep BVI CCD photometry of the stars in the dwarf galaxy DDO 210. The color-magnitude diagrams of DDO 210 show a well-defined red giant branch (RGB) and a blue plume. The tip of the RGB is found to be at ITRGB = 20.95 ± 0.10 mag. From this, the distance to DDO 210 is estimated to be d = 950 ± 50 kpc. The corresponding distance of DDO 210 to the center of the Local Group is 870 kpc, showing that it is a member of the Local Group. The mean metallicity of the RGB stars is estimated to be [Fe/H] = -1.9 ± 0.1 dex. Integrated magnitudes of DDO 210 within the Holmberg radius (rH = 110″ = 505 pc) are derived to be MB = -10.6 ± 0.1 and MV = -10.9 ± 0.1 mag. B and V surface brightness profiles of DDO 210 are approximately consistent with an exponential law with scale lengths rs(B) = 161 and rs(V) = 175 pc. The brightest blue and red stars in DDO 210 (BSG and RSG) are found to be among the faintest in the nearby galaxies with young stellar populations: 〈MV(3)〉BSG = -3.47 ± 0.11 and 〈MV(3)〉RSG = -4.75 ± 0.13 mag. An enhancement of the star formation rate in the recent past (several hundred Myr) is observed in the central region of DDO 210. The opposite trend is observed in the outer region of the galaxy, suggesting a possible two-component structure of the disk/halo kind found in spiral galaxies. The real nature of this two-component structure must, however, be confirmed with more detailed observations.

AB - We present deep BVI CCD photometry of the stars in the dwarf galaxy DDO 210. The color-magnitude diagrams of DDO 210 show a well-defined red giant branch (RGB) and a blue plume. The tip of the RGB is found to be at ITRGB = 20.95 ± 0.10 mag. From this, the distance to DDO 210 is estimated to be d = 950 ± 50 kpc. The corresponding distance of DDO 210 to the center of the Local Group is 870 kpc, showing that it is a member of the Local Group. The mean metallicity of the RGB stars is estimated to be [Fe/H] = -1.9 ± 0.1 dex. Integrated magnitudes of DDO 210 within the Holmberg radius (rH = 110″ = 505 pc) are derived to be MB = -10.6 ± 0.1 and MV = -10.9 ± 0.1 mag. B and V surface brightness profiles of DDO 210 are approximately consistent with an exponential law with scale lengths rs(B) = 161 and rs(V) = 175 pc. The brightest blue and red stars in DDO 210 (BSG and RSG) are found to be among the faintest in the nearby galaxies with young stellar populations: 〈MV(3)〉BSG = -3.47 ± 0.11 and 〈MV(3)〉RSG = -4.75 ± 0.13 mag. An enhancement of the star formation rate in the recent past (several hundred Myr) is observed in the central region of DDO 210. The opposite trend is observed in the outer region of the galaxy, suggesting a possible two-component structure of the disk/halo kind found in spiral galaxies. The real nature of this two-component structure must, however, be confirmed with more detailed observations.

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