In a laboratory, the Balmer-beta spectral line of hydrogen has a wavelength of 486.1 nm. If the line appears in a star's spectrum at 485.8 nm, what is the star's radial velocity (in km/s)? (Enter the magnitude.) km/s
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- Note: The answer should be typed. AsapThe star Procyon A has an apparent magnitude of 0.38 and an absolute magnitude of 2.66 while the star Ross 128 has an apparent magnitude of 11.1 and an absolute magnitude of 13.5. Which star emits more energy? A. Procyon A O B. Ross 128 O C. They emit pretty much the same energy. D. There is insufficient information to tell.What is the luminosity of a star having four times the radius of the Sun and a surface temperature of 8,000 K?
- What is the luminosity of a star having three times the radius of the Sun and a surface temperature of 10,000 K?Question A1 Use a diagram to explain what is meant by the parallax angle, p, for a star observed twice from Earth, with a 6-month interval between each observation. Hence define the parsec, and calculate its value in astronomical units and metres. The star Betelgeuse is observed to have a parallax angle p = 4.5 x 10-³ arcseconds. State the distance of Betelgeuse in units of parsecs and light years.Star 1 and star 2 have the same V-magnitude, V = 7.5. However, they have different B-magnitudes, B1 = 7.2 and B2 = 8.5. What are the (B − V) colors of the two stars?
- Which star in the table below is the closest to Earth? Star Name d (parsecs) Parallax (seconds of arc) Spectral Type $$ \delta $$ Cen 0.026 B2 IV HR 4607 0.039 G8 III HR 4758 20 G0 V HR 39801 0.005 M2 I 9 CMa 2.5 A1 V a. $$ \delta $$ Cen b. HR 4607 c. HR 4758 d. HD 39801 e. 9 CMa11A star has a surface area of 6.49x1018 m2. How much power does it radiate if it has a surface temperature of 6,225 K? Submit your answer in exponential form. For example, 246000m or should be written as 2.46E5m . These are example units, yours may not be in m .