The HeI Emission Lines of SN 1987A

Details The HeI Emission Lines of SN 1987A The HeI Emission Lines of SN 1987A

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.3907l&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #39.07; Bulletin of the American Astronomical Society, Vol. 25, p.1349

Astronomy and Astrophysics

Astronomy

Scientific paper

We model the evolution of the HeI lines, especially HeI 1.08microns and HeI 2.06microns, from the envelope of SN 1987A during the first two years after the explosion. The HeI metastable 2(3S) and 2(1S) states are populated by fast electrons resulting from energy deposition by gamma rays, and depopulated by electron collisions, two-photon decay, and Penning ionization of HI. The 1.08microns and 2.06microns lines are excited by thermal electron impact, recombination, and photoexcitation by a UV continuum. We can fit the observed evolution of HeI 2.06microns with a model in which the helium in the emitting (v < 2500 km s(-1) ) region has mass M_He ~ 1.5 M_sun and contains ~ 5% of hydrogen. Only ~ 30 % of the observed 1.08microns line comes from HeI; this feature is actually dominated by [SI]1.08microns.

Affiliated with

Also associated with

No associations

Rating

The HeI Emission Lines of SN 1987A 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 The HeI Emission Lines of SN 1987A, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The HeI Emission Lines of SN 1987A will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-778517