Which of the following is correct for a stable +7dj5s i.ikyg star?

  1.A star X is burning ca8v at ukfw 6 ,ft.oc+q m-.jk48pnkny+rbon in its core. The reaction 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 corre epi 6:bo)a.n2uoux 5wct about 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 stars1vibl 1+n vw2j referred to as VV Cephei A a vbj+1lv12nwind 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 w*k5 nmy8 lem3h,ve b6wpq q42a mass greater than 4 times the mass of the Sun. Which of the following is correcpq,ehe4mn qvw6 bl 25ky*83mwt 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 l34( ngvq6u ssmass of the sun is a main sequence star. The time the sun is expected to spend in the main sequence is T. Whichv( 4l gsu3snq6 of the following is correct 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 prot6upnf 5yw 7ek(cit1-r .gzd04q.lblkon-proton 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 St(i*.nbu) ylc*k.wpev ar A and Star B are 0.250 arcseconds and 0.500 arcseconds respectivi.u) vn(l* ck*beyw.p ely. What is the shortest possible distance, in parsec, between Star A and Star B?

  A star with a mass similar to the Sun, a temperature hotter thansoms(g 52i8eib3( ;iyhfg x( 1k c;nhk the Sun, and a radius similar to the Earth wouldye(ci3h((k 8igsngkbh1oi m;x f25s; be found in which region of the usual Hertzsprung-Russell diagram?

  The luminosity of the Sun zz i7s( d+evfl fvy/;6is $L_⊙$​. 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 cpclq .)1)x mvare labelled.

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 highk kjfhl3o(+0u temperature and high density among hydrogen nuclei is essential. Which of the follolo0f3j+u hk(kwing correctly shows why high temperature and high pressure are needed?