Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...357l..33c&link_type=abstract
Astronomy and Astrophysics, v.357, p.L33-L36 (2000)
Astronomy and Astrophysics
Astrophysics
12
Stars: Formation, Stars: Fundamental Parameters, Stars: Binaries: General, Stars: Circumstellar Matter, Infrared: Stars, Radio Continuum: Stars
Scientific paper
We have imaged the ultra-compact H Ii region M17-UC1 at J, K, N, Q and 1.3 cm. A comparison with results from earlier epochs reveals an increase of the emitted flux both in the mid-infrared and radio continuum. Our N and Q images exhibit a second source of comparable strength 5arcsec southwest of M 17-UC1. While M 17-UC1 is not visible at J, faint at K but very bright at 1.3 cm, the second southern source shows rather opposite characteristics, namely being very bright at infrared wavelengths but invisible in the radio continuum, probably due to self-absorption. The spectral energy distributions indicate that the sources are still surrounded by the remnants of their proto-stellar cocoons. The observed luminosities measured between 1.2 and 20.0 mu m of about 103 Lsun for both sources leads to the conclusion that they represent the youngest population of early type stars in M 17. The projected linear distance of 8900 AU between M 17-UC1 and its southern companion qualifies them to be a likely binary star system of O or early B-type stars.
Beck Rainer
Chini Rolf
Nielbock Markus
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