Getting to the bottom of the lagoon - Dust, magnetism, and star formation

Details Getting to the bottom of the lagoon - Dust, magnetism, and star formation Getting to the bottom of the lagoon - Dust, magnetism, and star formation

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...357..502m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 357, July 10, 1990, p. 502-513. Research supported by NSERC.

Astronomy and Astrophysics

Astrophysics

18

Cosmic Dust, Interstellar Magnetic Fields, Open Clusters, Star Formation, Stellar Coronas, Grain Size, Interstellar Extinction, Ionized Gases, Neutral Gases

Scientific paper

A V-band polarimetric survey of stars associated with the Lagoon Nebula (M8; NGC 6523) and the embedded cluster NGC 6530 has been conducted. The data have been combined with existing photometric and spectroscopic observations in order to study the dust in the immediate vicinity and to investigate the alignment of magnetic field lines with identifiable symmetry axes. Using the cluster method, it has been possible to separate multiple stars from single stars and thereby derive acccurate values for the ratio of total to selective extinction and the distance modulus. The value of R for the associated dust is 4.6 + or - 0.3. Anomalous reddening is a characteristic of the region, not just Herschel 36. Electric vectors show a high degree of alignment perpendicular to the direction of the extension of the large-scale distributions of ionized gas and massive stars. The overall collapse of molecular gas appears to have been asymmetrical, proceeding most rapidly along a direction parallel to magnetic field lines. A lot of the dust mixed with the ionized gas has been destroyed, so the large-scale uniformity of reddening laws and polarization position angles indicates that much of the dust responsible for extinction and polarization is associated with neutral gas.

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