Comments on: Double dipped supernova

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By: Astrolink [Global Edition] » Astrosphere for June 15, 2007 | Latest astronomy news in 11 languages

Fri, 15 Jun 2007 19:40:28 +0000

[...] I covered the double supernova here. Phil Plait from Bad Astronomy has a great description of it was well. [...]

By: Peter Hornby

Peter Hornby — Fri, 15 Jun 2007 18:13:07 +0000

To be strictly accurate, the previous major outburst of Eta Carinae was in the 1830’s and 1840’s, not the 1870’s. The star reached magnitude -1 (brighter than Canopus and only half a magnitude down on Sirius) in 1843.

By: JC

JC — Fri, 15 Jun 2007 15:05:00 +0000

Yes, I’m curious as well…what makes you set Eta Car apart from other luminous blue variables? I know little about this, but I thought it was just considered a singularly spectacular example of that class.

By: Astrogeek

Astrogeek — Fri, 15 Jun 2007 15:04:27 +0000

Brian/Gary;

I’m not certain, but I think an abundance of helium is expected because of the sheer size of the H-burning zone in these hyper-massive stars, and because of the upheavals expected in their evolution.

The presence of heavy elements causes these massive stars to blow off mass during the formation phase. I’m not clear on why that is, but I’ve seen it referenced several times. Something about the presence of heavy elements making the solar winds more efficient at carving out a hollow in the proto-stellar gas cloud.

Thats also why we think that Pop. III stars could get monstrously huge (perhaps up to about 500Msol) and why that’s not possible in Pop. II or Pop. I stars.

By: jackd

jackd — Fri, 15 Jun 2007 14:49:14 +0000

I’m missing something here. What is it that makes Eta Carinae singular? Its size is amazing, but obviously not unique. The fact that it blew off so much mass is awe-inspiring, but that’s an effect, not a quality. So what is it? I assume we must know something about the two monster stars recently discovered that tells us that they don’t match Eta C – and it wouldn’t just be the lack of an ejected nebula, since that could happen tomorrow, right?

Maybe I’m just reading too much into your statement, but I do feel that you’ve said something I just don’t understand.