The Stellar Population of M17

Details The Stellar Population of M17 The Stellar Population of M17

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...686..310h&link_type=abstract

The Astrophysical Journal, Volume 686, Issue 1, pp. 310-324.

Astronomy and Astrophysics

Astronomy

17

Ism: Dust, Extinction, Ism: H Ii Regions, Infrared: Stars, Galaxy: Open Clusters And Associations: Individual: Messier Number: M17, Galaxy: Open Clusters And Associations: Individual: Ngc Number: Ngc 6618, Stars: Early-Type

Scientific paper

The stellar content of M17 has been investigated by multicolor photometry and spectroscopy. Various independent estimates yield a distance of 2.1+/-0.2 kpc. The ratio of total-to-selective extinction is R=3.9. Within a projected area of 3.6×3.7 pc, there are several thousand stars. About 74% of them show infrared excess suggesting the presence of dense circumstellar material; the excess frequency is higher for fainter stars. The number of spectroscopically classified exciting stars could be enlarged from 13 to 46. The two central O4 stars are both spectroscopic binaries; multiplicity of other early O-type stars could also be established, increasing the number of high-mass stars even further. Our data suggest at least two episodes of star formation: There are about 500 ZAMS sources (2Based on observations collected at the European Southern Observatory, Chile, Programs 069.C-0303(A), 071.D-0084, 073.C-0170(A+B), 075.C-0381(A+B), and 077.C-0291(A+B).

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