Which star in the table below has the least surface temperature?   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 CMa

Q: Absolute visual magnitude is   a. the apparent magnitude of a star observed from Earth.   b. the…

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Q: A star is observed with a surface temperature of 3,000 K and a luminosity of 100,000 solar…

A: Given , Temperature = 3000 K Solar Luminosity = 100,000  Now , mass and luminosity are related by…

Q: Hertzsprung-Russell Diagram Bhe or bhue white White Vellow Red orange Red ORigel Superglants…

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Q: The period–luminosity relation is useful in determining   a. the mass of a star for which the…

A: Period-luminosity relation :-                                                   According to this…

Q: What is the lifetime on the main sequence of a 2-solar-mass star? a. 1.8 × 1011 years b.…

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Q: What type of star has the longest life span? a. O b. K c. B d. A e. M

A: What type of star has the longest life span?

Q: Which of the following is wrong? A. Tidal effects in a binary star system become more important…

A: The following statements are correct:  A. Tidal effects in a binary star system become more…

Q: If parallax of a star is 0.22 arc-seconds and its apparent brightness is 50 x 10-6 W/m2 . What is…

A: Given: Apparent Brightness,b=50×10-6W/m2Parallax of star,p=0.22arc-secondsDistance to the…

Q: Which star in the table below has the greatest diameter?     Star Name d (parsecs) Parallax…

A: d. 58 Ori

Q: V B r 10.401 10.894 12.303 9.459 9.656 9.477 11.635 12.744 11.229 i 9.705 9.661 10.837 Parallax…

A: Given as,

Q: Which star in the table of stellar data has the largest parallax? Star distance (pc) |parallax angle…

A: In this problem, it is asking about the star which has maximum parallax.

Q: If Vega is apparent magnitude zero, and Deneb first magnitude, then     Vega must be 2.5× hotter…

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Q: Which main-sequence star would be the least luminous?   a. A   b. B   c. F   d. G   e. K

A: Answer:) option(a) A alpha century A is least luminous because its absolute magnitude (+4.4) which…

Q: This star has a mass of 3.3 MSun.  what is the main sequence lifetime of this star? You may assume…

A: Given data: Mass of the star MStar=3.3 MSun. The life time of the main sequence star is given as,…

Q: The star Firefly is located 3.0 pc away. If it had an absolute magnitude of 13.0, which value below…

A: Formula for absolute magnitude is, Mv=m-2.5log(d10)2 Where, Mv = absolute magnitude m = apparent…

Q: Of the following types of stars, the one that has never been and can never be a giant star is a   a.…

A: a. Red dwarf stars

Q: The greatest parallax angle of any star outside our solar system as viewed from Earth is Group of…

A: 1)We know that the parallax angle for the distant star is smaller, and the parallax angle for the…

Q: The total mass of a binary system can be calculated from a. the ratio of the angular…

A: Answer c. the semi major axis and period of the orbit.

Q: L = ( 0.0813 ) x (Rs) ^2 x 10-0.4m x Ls where L = luminosity of the desired star Rs = distance of…

A: Given: Luminosity of Sun, Ls=1.00 Distance of the Polaris' star,Rs=323 light years Apparent magniude…

Q: Which type of star would be the largest? a. M b. O c. B d. K e. A

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Q: The star Firefly is located 3.0 pc away. If it had an absolute magnitude of 13.0, which value below…

A: Write the given data. d=3AbsM=13

Q: 51 Pegasi" is the name of the first normal star (besides the Sun) around which a planet was…

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Q: The life-cycle path followed by a star is determined by the star’s initial  A. mass and size B.…

A: Star's mass is inversely proportional to its life cycle.

Q: Star A and Star B are a bound binary at a distance of 20 pc from the Earth. Their separation is 30…

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Q: Which of the following WOULD NOT characterizes the type(s) of star we would find at g, m, n, o, and…

A: The Hertzsprung-Russell (H-R) diagram is a graph that plots the luminosity (or absolute magnitude)…

Q: The Sun is a G2 star. Which of the following spectral types is slightly hotter than the Sun? O A. 03…

A: Spectral types Temperature (K) O3 >55,000 K0 5240 A1 9330 F2 7050 M9 <2700

Q: You measure a star to have a parallax angle of 0.12 arc-seconds What is the distance to this star in…

A: Write the given values of the problem- Parallax angle=0.12 arc-second

Q: A star has a parallax angle of 0.0270 arcseconds and an apparent magnitude of 4.641. What is the…

A: According to the guidelines, only one question will be answered. Please submit the other question…

Q: Question 32 Consider three Main Sequence stars, an O star, an F star and a K star, each with an…

A: Question 32: Among O star, F star, and K star each with a magnitude of 2 . which one is most…

Q: The hydrogen lines in spectral type A stars   a. are most narrow for supergiants.   b. are most…

A: From the H-R diagram we know that hydrogen lines in spectral type A stars are most narrow for…

Q: What is the total mass of a binary star system with P = 20 years and a = 10 AU?   a. 2 solar masses…

A: The trajectory of a planet orbit around a star can be studied using Kepler's laws of planetary…

Q: The Balmer lines are strongest in which class of star?   a. O   b. B   c. A   d. K   e. M

A: Balmer lines- it is one of a set of six named series describing the spectral line emissions of…

Q: Which star in the table below is the closest to Earth?   Star Name d (parsecs) Parallax (seconds of…

A: Introduction: Parallax is the apparent displacement of an object because of a change in the…

Q: A star has a parallax of 0.01 arc seconds. H

A: Given: Parallax P=0.01 arc sec

Q: What is the lifetime of a 10-solar-mass star on the main sequence?   a. 3.2 × 107 years   b. 320…

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Q: Which of the following binary star systems cannot exist? A. A 1 solar-mass main sequence star and a…

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