Question

One of the stars in the Orion constellation, Betelgeuse has an average angular diameter of approximately 0.05 arcsec. The distance was measured to be about 220 pc. What is the size of Betelgeuse compared to the size of the Sun?

Answer #1

The red supergiant star Betelgeuse has an effective temperature
of 3500 K and an angular diameter of 0.045 arcsec. Assuming the
star is 200 pc away, determine the luminosity L of Betelgeuse.
Express your final answer in solar luminosities, L⊙, to three
significant figures.
Use the small‑angle approximation to determine the physical
diameter of Betelgeuse. Convert arcseconds to radians before
applying the small‑angle approximation.

GAIA is a mission by ESA that is measuring the positions of one
billion stars. The precision in the parallax measurements is as
small as 24 micro-arcsec (24×10^?6 arcsec).
1.What is the greatest distance that GAIA will be able to
measure?
2.The Hipparcos satellite measured parallaxes as small as
10^?3 arcsec. Compared to Hipparcos, by what factor will
the volume of space over which we can measure parallax improve with
the new GAIA space mission?

The
Sun has an angular diameter of approximately 30 arcminutes (half a
degree). Which eyepiece would be best to observe the Sun, one with
a field of view of 20 arcminutes or one with a field of view of 60
arcminutes? Explain your reasoning.

Neutron stars, such as the one at the center of the Crab Nebula,
have about the same mass as our sun, but a much smaller
diameter.
Part A
If you weigh 700 N on the earth, what would you weigh on the
surface of a neutron star that has the same mass as our sun and a
diameter of 20.0 km?

Neutron stars, such as the one at the center of the Crab Nebula,
have about the same mass as our sun but a much smaller diameter. If
you weigh 670 N on the earth, what would be your weight on the
surface of a neutron star that has the same mass as our sun and a
diameter of 21.0 km ? Take the mass of the sun to be ms = 1.99×1030
kg , the gravitational constant to be G...

neutron stars, such as the one at the center of the crab Nebula,
have about the same mass as our sun but a much smaller diameter. if
you weigh 690 N on the earth, what would be your weight on the
surface of a neutron star has the same mass our sun and a diameter
of 190. km? take the mass of the sun to be ms= 1.99x10^30 kg. the
gravitational constant to be G= 6.67x10^-11 N.m^2/kg^2. and the
acceleration...

Neutron stars, such as the one at the center of the Crab Nebula,
have about the same mass as our sun but a much smaller
diameter.
If you weigh 690 N on the earth, what would be your weight on
the surface of a neutron star that has the same mass as our sun and
a diameter of 21.0 km ?
Take the mass of the sun to be ms =
1.99×1030 kg , the gravitational constant to be
G...

If a star has a parallax of .005 arcsec, what is its distance?
How does your calculated distance compare to the size of our Milky
Way Galaxy (about 30,000 pc)? The Large Magellanic Cloud is one of
the closest galaxies to us at 50,000 pc away. If .005 is the
smallest parallax we can measure, do you think trigonometric
parallax is a useful technique for measuring distances to galaxies?
Explain your answer.

One of the possible final outcomes of a stars life cycle is the
formation of a neutron which are extremely massive but relatively
small objects. A typical neutron start is only 20 kilometers in
diameter but has a mass approximately 1.4 times that of our sun
msun=2x1030kgm_{sun}=2x10^{30}kgmsun
=2x1030kg. What is the acceleration due
to gravity on the surface of a neutron start
275,383
m/s2
9.8 m/s29.8\ m/s^29.8
m/s2
275 m/s2275\ m/s^2275
m/s2
1.9x1012
m/s21.9x10^{12}\ m/s^21.9x1012 m/s2
4.7x1011
m/s24.7x10^{11}\ m/s^24.7x1011 m/s2

Stars emit radiation whose spectrum is very similar to that of a
blackbody. Imagine two stars identical in size, each of which is at
the same distance from us. One of the stars appears reddish in
color, while the other one looks distinctly bluish. Based on this
information, what can you say about the relative temperatures of
the two stars? Which is the hotter?
The relative temperature of a star that is red in color is
higher than that of...

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