Astronomers use eclipsing binary star...

Astronomers use eclipsing binary stars to determine the distance to nearby galaxy

There are 1 comment on the Gizmag story from Mar 8, 2013, titled Astronomers use eclipsing binary stars to determine the distance to nearby galaxy. In it, Gizmag reports that:

After close to a decade of observations, astronomers have accurately determined the distance to our neighboring galaxy, the Large Magellanic Cloud .

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“Geologist [I'm Climate Change]”

Since: Mar 07

formerly Nuneaton

#1 Mar 11, 2013
Very nice article.

Found that Hipparcos data completely scrambles the distances of Cepheids in our own galaxy which appear to be in 3 discrete populations (possibly 4), all with diffrent cuclear burning scenarios in the core.

2 populations of Cepheids used as a standard candle exist in the LMC but due to the scramble, and intrinsic & extrinsic dust dimming in the Hipparcos data and the LMC being too far away, the absolute magnitudes are difficult to link in.

The bulk of galactic Cepheids of bright type appear to be Carbon burners with He and H shells & lots of relatively C & N rich dust. RS puppis actually has visible shells of dust surrounding the star. They all (even with dust dimming corrections) appear by & large to be fainter than their classical expectation via the old period/luminosity relationship. Even the longest period Cepheids of 35 days or so appear to be below absolute magnitude -5.

The LMC cepheids appear to be far less dusty and this may also affect the absolute magnitude.

This independent result looks to be very useful.

The Local Group may well become bit more compact than formerly believed.

Have a nice day: Ag

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