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The Perseus arm stellar overdensity at 1.6 kpc

Published online by Cambridge University Press:  17 July 2015

M. Monguió ,
P. Grosbøl  and
F. Figueras
M. Monguió
Affiliation:
Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal. Escuela Politécnica Superior, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain
P. Grosbøl
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany
F. Figueras
Affiliation:
Departament d'Astronomia i Meteorologia and IEEC-ICC-UB, Universitat de Barcelona, Martí i Franquès, 1, 08028 Barcelona, Spain
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Abstract

The stellar overdensity due to the Perseus arm has been detected in the anticenter direction through individual field stars. For that purpose, a Strömgren photometric survey covering 16∘2 was developed with the Wide Field Camera at the Isaac Newton Telescope. This photometry allowed us to compute individual physical parameters for these stars using a new method based on atmospheric models and evolutionary tracks. The analysis of the surface density as a function of distance for intermediate young stars in this survey allowed us to detect an overdensity at 1.6 ± 0.2 kpc from the Sun, that can be associated with the Perseus arm, with a surface density amplitude of ∼14%. The significance of the detection is above 4σ for all the cases. The fit for the radial scale length of the Galactic disk provided values in the range [2.9,3.5] kpc for the population of the B4-A1 stars. We also analyzed the interstellar visual absorption distribution, and its variation as a function of distance is coherent with a dust layer before the Perseus arm location.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 68: The Milky Way Unravelled by Gaia: GREAT Science from the Gaia Data Releases , 2014 , pp. 205 - 209
Copyright
© EAS, EDP Sciences, 2015

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References

Hauck, B., & Mermilliod, M., 1998, A&AS, 129, 431
Momany, Y., Zaggia, S., Gilmore, G., et al., 2006, A&A, 451, 515
Monguió, M., Figueras, F., & Grosbøl, P., 2013, A&A, 549, A78
Monguió, M., Figueras, F., & Grosbøl, P., 2014, A&A, 568, A119
Roberts, W.W., 1969, ApJ, 158, 123CrossRef
Roberts, Jr., W.W., 1972, ApJ, 173, 259CrossRef
van der Kruit, P.C., & Searle, L., 1981, A&A, 95, 105