IUE observations of Large Magellanic Cloud members and detection of the 2,200 Å feature

Details IUE observations of Large Magellanic Cloud members and detection of the 2,200 Å feature IUE observations of Large Magellanic Cloud members and detection of the 2,200 Å feature

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.276..478n&link_type=abstract

Nature, Volume 276, Issue 5687, pp. 478-479 (1978).

Other

13

Scientific paper

THE dominant feature in the UV spectra of reddened stars in our Galaxy is the broad absorption feature of interstellar origin, centred near 2,200 Å and having a halfwidth of 350 Å (ref. 1). The wavelength position of this feature and the correlation of its strength with other interstellar extinction parameters, for example, the visual colour excess E(B -V) are remarkably uniform throughout the Galaxy within 2 kpc from the Sun2. The 2,200 Å feature is attributed to small graphite spheres with radii between 100 and 200 Å (ref. 3), but a molecular origin cannot be ruled out4. It is, therefore, the most important feature to search for in the interstellar extinction laws of other galaxies. The Magellanic Clouds are the nearest extragalactic systems and the Large Magellanic Cloud (LMC), in particular the region near 30 Doradus, contains a significant amount of dust5. In the past few years considerable doubt has been expressed about the existence of the 2,200 Å feature in the LMC extinction law as derived from surface brightness measurements of the region around 30 Doradus6, the results being rather inconclusive due to the difficulties arising from uncertainties in the luminosity function for the region concerned7. The interstellar extinction law can be reliably determined only from studies of the individual spectra of reddened and unreddened stars of similar spectral types. We present here the UV observations of a moderately reddened and a slightly reddened early type supergiant in the LMC obtained with the IUE. These observations answer the question of whether or not the agents responsible for the 2,200 Å feature are present in interstellar dust in the LMC.

Affiliated with

Also associated with

No associations

Rating

IUE observations of Large Magellanic Cloud members and detection of the 2,200 Å feature does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with IUE observations of Large Magellanic Cloud members and detection of the 2,200 Å feature, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and IUE observations of Large Magellanic Cloud members and detection of the 2,200 Å feature will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1067875