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A photometric and spectroscopic study of the new dwarf spheroidal galaxy in Hercules: metallicity, velocities, and a clean list of RGB members

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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A photometric and spectroscopic study of the new dwarf spheroidal galaxy in Hercules: metallicity, velocities, and a clean list of RGB members. / Adén, D.; Feltzing, S.; Koch, A. et al.
In: Astronomy and Astrophysics, Vol. 506, No. 3, 27.08.2009, p. 1147-1168.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Adén, D, Feltzing, S, Koch, A, Wilkinson, MI, Grebel, EK, Lundström, I, Gilmore, GF, Zucker, DB, Belokurov, V, Evans, NW & Faria, D 2009, 'A photometric and spectroscopic study of the new dwarf spheroidal galaxy in Hercules: metallicity, velocities, and a clean list of RGB members', Astronomy and Astrophysics, vol. 506, no. 3, pp. 1147-1168. https://doi.org/10.1051/0004-6361/200912718

APA

Adén, D., Feltzing, S., Koch, A., Wilkinson, M. I., Grebel, E. K., Lundström, I., Gilmore, G. F., Zucker, D. B., Belokurov, V., Evans, N. W., & Faria, D. (2009). A photometric and spectroscopic study of the new dwarf spheroidal galaxy in Hercules: metallicity, velocities, and a clean list of RGB members. Astronomy and Astrophysics, 506(3), 1147-1168. https://doi.org/10.1051/0004-6361/200912718

Vancouver

Adén D, Feltzing S, Koch A, Wilkinson MI, Grebel EK, Lundström I et al. A photometric and spectroscopic study of the new dwarf spheroidal galaxy in Hercules: metallicity, velocities, and a clean list of RGB members. Astronomy and Astrophysics. 2009 Aug 27;506(3):1147-1168. doi: 10.1051/0004-6361/200912718

Author

Adén, D. ; Feltzing, S. ; Koch, A. et al. / A photometric and spectroscopic study of the new dwarf spheroidal galaxy in Hercules : metallicity, velocities, and a clean list of RGB members. In: Astronomy and Astrophysics. 2009 ; Vol. 506, No. 3. pp. 1147-1168.

Bibtex

@article{f032e620a34149b187bb40e3357d7a06,
title = "A photometric and spectroscopic study of the new dwarf spheroidal galaxy in Hercules: metallicity, velocities, and a clean list of RGB members",
abstract = "Our aim is to provide as clean and as complete a sample as possible of red giant branch stars that are members of the Hercules dSph galaxy. With this sample we explore the velocity dispersion and the metallicity of the system. Stromgren photometry and multi-fibre spectroscopy are combined to provide information about the evolutionary state of the stars (via the Stromgren c_1 index) and their radial velocities. Based on this information we have selected a clean sample of red giant branch stars, and show that foreground contamination by Milky Way dwarf stars can greatly distort the results. Our final sample consists of 28 red giant branch stars in the Hercules dSph galaxy. Based on these stars we find a mean photometric metallicity of -2.35 dex which is consistent with previous studies. We find evidence for an abundance spread. Using those stars for which we have determined radial velocities we find a systemic velocity of 45.2 km/s with a dispersion of 3.72 km/s, this is lower than values found in the literature. Furthermore we identify the horizontal branch and estimate the mean magnitude of the horizontal branch of the Hercules dSph galaxy to be V_0=21.17, which corresponds to a distance of 147 kpc. We have shown that a proper cleaning of the sample results in a smaller value for the velocity dispersion of the system. This has implications for galaxy properties derived from such velocity dispersions.",
keywords = "astro-ph.GA",
author = "D. Ad{\'e}n and S. Feltzing and A. Koch and Wilkinson, {M. I.} and Grebel, {E. K.} and I. Lundstr{\"o}m and Gilmore, {G. F.} and Zucker, {D. B.} and V. Belokurov and Evans, {N. W.} and D. Faria",
note = "24 pages, 28 figures",
year = "2009",
month = aug,
day = "27",
doi = "10.1051/0004-6361/200912718",
language = "English",
volume = "506",
pages = "1147--1168",
journal = "Astronomy and Astrophysics",
issn = "1432-0746",
publisher = "EDP Sciences",
number = "3",

}

RIS

TY - JOUR

T1 - A photometric and spectroscopic study of the new dwarf spheroidal galaxy in Hercules

T2 - metallicity, velocities, and a clean list of RGB members

AU - Adén, D.

AU - Feltzing, S.

AU - Koch, A.

AU - Wilkinson, M. I.

AU - Grebel, E. K.

AU - Lundström, I.

AU - Gilmore, G. F.

AU - Zucker, D. B.

AU - Belokurov, V.

AU - Evans, N. W.

AU - Faria, D.

N1 - 24 pages, 28 figures

PY - 2009/8/27

Y1 - 2009/8/27

N2 - Our aim is to provide as clean and as complete a sample as possible of red giant branch stars that are members of the Hercules dSph galaxy. With this sample we explore the velocity dispersion and the metallicity of the system. Stromgren photometry and multi-fibre spectroscopy are combined to provide information about the evolutionary state of the stars (via the Stromgren c_1 index) and their radial velocities. Based on this information we have selected a clean sample of red giant branch stars, and show that foreground contamination by Milky Way dwarf stars can greatly distort the results. Our final sample consists of 28 red giant branch stars in the Hercules dSph galaxy. Based on these stars we find a mean photometric metallicity of -2.35 dex which is consistent with previous studies. We find evidence for an abundance spread. Using those stars for which we have determined radial velocities we find a systemic velocity of 45.2 km/s with a dispersion of 3.72 km/s, this is lower than values found in the literature. Furthermore we identify the horizontal branch and estimate the mean magnitude of the horizontal branch of the Hercules dSph galaxy to be V_0=21.17, which corresponds to a distance of 147 kpc. We have shown that a proper cleaning of the sample results in a smaller value for the velocity dispersion of the system. This has implications for galaxy properties derived from such velocity dispersions.

AB - Our aim is to provide as clean and as complete a sample as possible of red giant branch stars that are members of the Hercules dSph galaxy. With this sample we explore the velocity dispersion and the metallicity of the system. Stromgren photometry and multi-fibre spectroscopy are combined to provide information about the evolutionary state of the stars (via the Stromgren c_1 index) and their radial velocities. Based on this information we have selected a clean sample of red giant branch stars, and show that foreground contamination by Milky Way dwarf stars can greatly distort the results. Our final sample consists of 28 red giant branch stars in the Hercules dSph galaxy. Based on these stars we find a mean photometric metallicity of -2.35 dex which is consistent with previous studies. We find evidence for an abundance spread. Using those stars for which we have determined radial velocities we find a systemic velocity of 45.2 km/s with a dispersion of 3.72 km/s, this is lower than values found in the literature. Furthermore we identify the horizontal branch and estimate the mean magnitude of the horizontal branch of the Hercules dSph galaxy to be V_0=21.17, which corresponds to a distance of 147 kpc. We have shown that a proper cleaning of the sample results in a smaller value for the velocity dispersion of the system. This has implications for galaxy properties derived from such velocity dispersions.

KW - astro-ph.GA

U2 - 10.1051/0004-6361/200912718

DO - 10.1051/0004-6361/200912718

M3 - Journal article

VL - 506

SP - 1147

EP - 1168

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 1432-0746

IS - 3

ER -