# What would happen to the Sun's evolution if it collided with another yellow dwarf?

How would the Sun evolve if it collided with another G-type main sequence star, perhaps a more massive one like Alpha Cen A? Since its mass would then be above the Chandrasekhar limit, could it eventually become a neutron star instead of a white dwarf? Or would it lose enough mass until then so that it would still become a white dwarf, just like Sirius A (whose mass is above the Chandrasekhar limit too but will develop into a white dwarf anyway due to mass loss)? Would the Sun's yellow-dwarf-to-red-giant phase be prolonged due to the additional mass? When largest, would the red giant be bigger than the currently estimated 256 solar radii?

• 2 solar masses is far too light for a star to explode in a core collapse supernova. IIRC, the progenitor of a neutron star needs over 10 $M_\odot$. – PM 2Ring Nov 27 '20 at 12:33
• Accretion induced collapse (AIC) , is a means of forming neutron stars. – ProfRob Nov 27 '20 at 18:03
• It's a pity PM2Ring deleted his informative comments following his first one and my question in retard. – Greenhorn Nov 28 '20 at 15:23

If the mass of a star is doubled, then its lifespan is decreased by eightfold, meaning that the merger would live for about $$\dfrac{10}{8}= 1.25 \text{ billion years}.$$ With that said, the transition to the red giant phase would not be prolonged, but shortened.