Near-infrared proper motions and spectroscopy of infrared excess sources at the Galactic center

0423355 - ASÚ 2014 RIV FR eng J - Journal Article
Eckart, A. - Muzic, K. - Yazici, S. - Sabha, N. - Shahzamanian, B. - Witzel, G. - Moser, L. - García-Marín, M. - Valencia-S, M. - Jalali, B. - Bremer, M. - Straubmeier, C. - Rauch, C. - Buchholz, R. M. - Kunneriath, Devaky - Moultaka, J.
Near-infrared proper motions and spectroscopy of infrared excess sources at the Galactic center.
Astronomy & Astrophysics. Roč. 551, March (2013), A18/1-A18/31. ISSN 0004-6361. E-ISSN 1432-0746
Grant - others:ESA(XE) ESA-PECS projec No. 98040; DFG(DE) SFB 956; EU(XE) COST Action MP0905; BMBF(DE) 50OS1101
Institutional support: RVO:67985815
Keywords : galaxy center * early-type stars
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics
Impact factor: 4.479, year: 2013

We present a first K-s-band identification and proper motions of the IRS13N members, the high-velocity dusty S-cluster object (DSO, also referred to as G2), and other infrared excess sources in the central field. Goal is to constrain the nature of these source. We show that within the uncertainties, the positions and proper motions of the IRS13N sources in K-s- and L'-band are identical. The HK- sL' colors then indicate that the bright L'-band IRS13N sources are indeed dust-enshrouded stars rather than core-less dust clouds. The proper motions also show that the IRS13N sources are not strongly gravitationally bound to each other. Combined with their NIR colors, this implies that they have been formed recently. For the DSO we obtain proper motions and a K-s-L'-color.
Permanent Link: http://hdl.handle.net/11104/0229559