Question
In: Physics
You have discovered a new galaxy and you think you have identified an Type II Cepheid...
You have discovered a new galaxy and you think you have identified an Type II Cepheid star with a period of 30 days. You measure its brightness and with the Period-Luminosity function you calculate the distance to the galaxy d. However, you later find out that in fact the star you had identified is a Type I Cepheid. Is the galaxy further than, or, close to, us than we previously expected? By what factor should you multiply d to get the correct distance to the new galaxy? [Hint: check the diagram in the slides for the Distance Ladder lecture]
Solutions
genius_generous answered 1 year agoRelated Solutions
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universe have planets). Given the current state of technology,
astronomers are not able to conduct a complete scan of all the
stars in this galaxy. So instead they randomly observed 45 stars
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Astronomers have recently discovered an unknown distant galaxy and noticed something abnormal. Specifically, they suspect the...
Astronomers have recently discovered an unknown distant galaxy
and noticed something abnormal. Specifically, they suspect the
percentage of stars that host planets in this galaxy is lower than
is typical. (It is known that around 75% of stars throughout the
universe have planets). Given the current state of technology,
astronomers are not able to conduct a complete scan of all the
stars in this galaxy. So instead they randomly observed 45 stars
within the new galaxy, and found only 24...
Astronomers have recently discovered an unknown distant galaxy and noticed something abnormal. Specifically, they suspect the...
Astronomers have recently discovered an unknown distant galaxy
and noticed something abnormal. Specifically, they suspect the
percentage of stars that host planets in this galaxy is lower than
is typical. (It is known that around 75% of stars throughout the
universe have planets). Given the current state of technology,
astronomers are not able to conduct a complete scan of all the
stars in this galaxy. So instead they randomly observed 45 stars
within the new galaxy, and found only 24...
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