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- W847881886 abstract "Recent broad-band 34 and 44 GHz radio continuum observations of the Galactic center have revealed 41 massive stars identified with near-IR counterparts, as well as 44 proplyd candidates within 30 of Sgr A*. Radio observations obtained in 2011 and 2014 have been used to derive proper motions of eight young stars near Sgr A*. The accuracy of proper motion estimates based on near-IR observations by Lu et al. and Paumard et al. have been investigated by using their proper motions to predict the 2014 epoch positions of near-IR stars and comparing the predicted positions with those of radio counterparts in the 2014 radio observations. Predicted positions from Lu et al. show an rms scatter of 6 mas relative to the radio positions, while those from Paumard et al. show rms residuals of 20 mas, which is mainly due to uncertainties in the IR-based proper motions. Under the assumption of homogeneous ionized winds, we also determine the mass-loss rates of 11 radio stars, finding rates that are on average $sim$2 times smaller than those determined from model atmosphere calculations and near-IR data. Clumpiness of ionized winds would reduce the mass loss rate of WR and O stars by additional factors of 3 and 10, respectively. One important implication of this is a reduction in the expected mass accretion rate onto Sgr A* from stellar winds by nearly an order of magnitude to a value of few$times10^{-7}$ msol yr$^{-1}$. Finally, we present the positions of 318 compact 34.5 GHz radio sources within 30arcs of Sgr A*. At least 45 of these have stellar counterparts in the near-IR $K_s$ (2.18 $mu$m) and $L'$ (3.8$mu$m) bands." @default.
- W847881886 created "2016-06-24" @default.
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- W847881886 date "2015-08-04" @default.
- W847881886 modified "2023-10-14" @default.
- W847881886 title "COMPACT RADIO SOURCES WITHIN 30″ OF SGR A*: PROPER MOTIONS, STELLAR WINDS, AND THE ACCRETION RATE ONTO SGR A*" @default.
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- W847881886 doi "https://doi.org/10.1088/0004-637x/809/1/10" @default.
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