The LMC UV Extinction Curve Re--visisted

Astronomy and Astrophysics – Astronomy

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Scientific paper

As part of an on--going effort to quantify the extinction properties in the Local Group, we have re--analyzed the LMC UV extinction curve. UV extinction curves have been contstructed via the pair method using the most highly reddened stars from Fitzpatrick (1985, ApJ 299,219) as well as five new reddened stars for which archival IUE spectra exist. In addition to constructing average LMC extinction curves, we have taken advantage of the improved signal--to--noise in the NEWSIPS IUE reduction to examine several stars with large reddening on an individual basis. We find less regional difference between the star--forming 30 Dor region and the remainder of the LMC as compared to Fitzpatrick (1985) and several stars have extinction curves remarkably similar to the average Galactic curve, most notably SK -69 210 whose projected position places it on the western edge of 30 Dor near the LH 89 OB association. In an effort to quantify the dependence of the UV extinction curve in the LMC on the environment (eg. star--formation) we collect data from the literature on individual lines of sight to several of our reddened stars.

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