Which of the following is correct for a stable tyb1ug02; j) aur0tmnsbi lln:w 1-9dstar?

  1.A star X is burning carbon in its core. The react5gpa )me/lxc.r8su w, ion is given by:
$^{12}_{6}C$+$^{12}_{6}C$→$^{24}_{12}​Mg$
The following data are available for the reaction.
Rest mass of the$^{12}_{6}C$= 12.0111507u
Rest mass of the$^{24}_{12}​Mg$= 23.9909630u
Determine, in MeV, the energy released in the reaction. Be sure to express your answer to the correct number of significant figures. $ΔE$ =    MeV
2.The star Y is a red supergiant. State the next steps in the evolutionary sequence of the star Y.
3.Outline why the sun is not expected to undergo carbon fusion.

  Which of the following is correct azq)vss*2 o)k fbout a red giant star?
I. The orbits of the inner planets of the solar system and could fit into the volume of it
II. Cooler than the Sun
III. Have higher luminosity than the Sun

  1.VV Cephei is a binary star system composed of two stars re +15p flo,plquferred to as VV Cephpfl,plq5+ 1 uoei A and VV Cephei B.
(1)The measured wavelength of the peak spectral line of VV Cephei A is 760 nm. Show that the surface temperature of VV Cephei A is approximately 3800 K. T =    K
(2)The surface temperature of the Sun is $T_⊙$​=5800 K. The luminosity of the VV Cephei A is $2.7\times10^5$ times the Sun's luminosity $L_⊙$​. Determine the radius of VV Cephei A in terms of the Sun's radius $R_⊙$​. R =    $R_⊙$​
3.A Herzsprung-Russel (HR) diagram is shown.


Plot the current position of VV Cephei A on the HR diagram and identify the classification of VV Cephei A.
2.The mass of VV Cephei B is about 11 times the mass of the Sun and it is not on the main sequence.
(1)In terms of forces, explain the condition that causes a star to first leave the main sequence.2
(2)Explain why VV Cephei B is likely to remain on the main sequence for a shorter time than the Sun.2
(3)The parallax angle for VV Cephei B is 0.31 arcseconds. Calculate, in light years, the distance between the earth and VV Cephei B.2. d =    ly
(4)State why the parallax method is not suitable for measuring the distance of very distant stars.

  A main sequence star has a mass greater than 4 times the mass of 19zt/71yu zy+d c+sasosm9 clthe Sun. Which of the followzy+m cua91 y/s osl79sz1c dt+ing is correct about the possible the fate of the star?
I. White dwarf
II. Neutron star
III. Black hole

  A star with a mass of twice the mass of the sun i nvpn/i+, fi4gs a main sequence star. The time the sun is expected to spend in the main sequence is T. Which of the following is correct p+i/fng 4i vn,for the time the star is expected to spend in the main sequence and the next stage in its evolution?

  In the core of a star, a proton-prot/fsgc zw7q6ym 0up 3yxjnc*-.on chain reaction takes place.
$4^1_1​H$→$^4_2​He$+$2^0_{+1}​β^+$+$2\,ν_e$​+$2\,γ$
After the initial stage of the reaction, two positrons annihilate with electrons present in the surroundings. Which of the following correctly shows the nature of the chain reaction and the energy released due to annihilation?

  The parallax angles of Star A and Star B are 0.250 arcseconds a j3d7;r3hdpy7.pkvfrv 0 yc8lnd 0.500 arcseconds respectively. What is the shortest possible distance, in parsec, between Star A an.h;37jfy ckypdrp73vrld08v d Star B?

  A star with a mass similar to the Sun, a temperatmu5:t ms65cueure hotter than the Sun, and a radius similar to stm5: m6cu5e uthe Earth would be found in which region of the usual Hertzsprung-Russell diagram?

  The luminosity of the Sun i :n62hd88deazsmfs ly) /5: nqct (ndss $L_⊙$​. A main sequence star with twice the radius of the sun and twice the temperature of the sun has a luminosity of $L$. What is the ratio of $\frac{L}{⊙​L}​$ ?

  Some regions on the H-R diagram are latrk *tc(,)8al.i nvp xbelled.

A main sequence star with a mass of three times the Sun will evolve through a series of stages. Which of the following sequences of stages could correctly represent the path of the evolution of this star?

  For fusion reactions to occur in a cloud of stellar dust, a combination of highsc9r) n.wca tvlk6 :31 ,xixdu temperature and high density among hydrogen nuclei is essential,rils9)cdk nc ut x xw.31:6av. Which of the following correctly shows why high temperature and high pressure are needed?