Some questions

Hungry4info · Post #1by **Hungry4info** » 26.12.2007, 21:24

Can anybody tell me the metallicity of Wolf 359 and Sirius B? I've been searching for literally weeks, and have been unsucessful.

It would be greatly appreciated. Thanks in advance.

Post #2by **selden** » 26.12.2007, 22:16

In the professional literature cited on Simbad, Wolf 359 is more often referred to as CN Leonis. Did you use that name when searching?

At any rate, there are quite a few papers listed by Simbad for both objects. Both seem to be high in metals.

ajtribick · Post #3by **ajtribick** » 26.12.2007, 23:16

Sirius B is a carbon/oxygen white dwarf (i.e. mostly made of "metals"), no?

As for the metallicity of the progenitor, that's rather harder to figure out... the fact that Sirius A likely got contaminated during the red giant stage also makes things tricky.

Hungry4info · Post #4by **Hungry4info** » 26.12.2007, 23:34

selden wrote:Did you use that name when searching?

Yes.

selden wrote:At any rate, there are quite a few papers listed by Simbad for both objects. Both seem to be high in metals.

I only found two when I searched CN Leo, and none when searching Wolf 359. For the two I found, both of them seemed to hint at discussing metallicity, but they either didn't reveal CN Leo's metallicity, or it's in a format that I don't understand (I'm not quite a professional astronomer).

chaos syndrome wrote:Sirius B is a carbon/oxygen white dwarf (i.e. mostly made of "metals"), no?

Indeed, and I figured this would affect metallicity. However I cannot seem to find any actual value, much like with CN Leo.

[/quote]As for the metallicity of the progenitor, that's rather harder to figure out... the fact that Sirius A likely got contaminated during the red giant stage also makes things tricky.[/quote]
I've a metallicity of 0.2788 for Sirius A. I found a metallicity of 190% for Sirius A from somewhere, and

Code: Select all

log(1.9) = 0.2788

if I did the math right.