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Hubble observations of massive stars in the Large Magellanic Cloud

Hubble observations of massive stars in the Large Magellanic Cloud


Date: 11 May 2010
Satellite: Hubble Space Telescope
Depicts: Spectra of the stars 30 Dor #016 and HDE 269810
Copyright: NASA, ESA, C. Evans (Royal Observatory Edinburgh), N. Walborn (STScI) and D. Lennon (ESA/STScI)

This is the Hubble Space Telescope Cosmic Origins Spectrograph (COS) observation of 30 Dor #016 compared with one by the Hubble Space Telescope Imaging Spectrograph (STIS) of the similar star HDE 269810, also in the Large Magellanic Cloud.

The stellar-wind features of helium, carbon, oxygen, and nitrogen are identified by their chemical symbols above; the roman numerals indicate the ionisation stages, i.e., the number of electrons removed plus one. ("I" would indicate the neutral atom.) The broad emission components plus blue-shifted absorption are diagnostics of the stellar winds; the absorption forms along the line of sight to the stellar disk, where the wind is approaching us at its full speed.

The O V line is a unique feature of the hottest (O2-O3) stars.

Last Update: 1 September 2019
19-Oct-2021 13:04 UT

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