Recent content by odoital

Homework Statement A B0 star has a luminosity of ~ 16000 L(solar) and a mass of ~ 16 M(solar). Can you estimate the time on the main sequence for this star simply from considering the rest mass energy of the core of the star (~10% of the total, and fusion burns with an efficiency of about...

Given that it can only(!) read to 24micro-arcseconds, no - as the calculated angle is 14.28 microarcseconds. But I'm confused at the way the question's worded - "estimate HOW ACCURATELY Gaia will determine distances to these Cepheids", I'm not sure what physical quantity it's asking for

ok, well converting to meters: 1AU = 149.6 x 10^9 m 70kpc = (70,000) * (3.086 x 10^16) m Angle, say, x = 3.97 x 10^-9 degrees = 14.28 microarcseconds

Hmm, i tried that and the angle came out as virtually 0 arc seconds

Homework Statement The planned Gaia satellite is a successor to Hipparcos. It will have an astrometric accuracy of 24 micro-arcseconds, and be able to detect Cepheid variable stars in the Magellanic clouds (~ 70kpc away). Estimate how accurately Gaia will determine distances to these...