W type star

W type star

**W type star**s are a type of O type star thats very massive the lowest mass **W type star**s have masses of 90 and the most massive O type stars have 120 solar masses so this means they overlap with O type stars.

An example R136A1 has a Mass spectral class of W3.5, Actual spectral class:WN5h.

### Life

The life of a 90 solar mass W type stars is this, Protostar (100,000 years) - **W type star** (1.23MYR) - Wolf Rayet (500,000 years)- LBV star (400,000 years) - Black hole.

The life of a 435 solar mass W type star is this, **W type star** (52,800 years) - Black hole.

The reason why a WOV stars skip the Wolf Rayet and LBV star phase is because these phases become longer then the main sequence causing those phases not to exist.

Star lifetimes
 25
 15,625

Examples

R136A1 (Wolf Rayet)315 solar masses,Mass:W3.5,Luminosity:W7,Temperature:O5.5

## Other properties

### Radius

14 R (7,000,000 KM)

(80 examples of W type main sequence stars)

(30 examples of W mass Wolf Rayet)

#### Lifetime

These stars have lifetimes of over 1 million years and some even living for hundreds thousands or years an example R136a1 the most massive is a W type mass wolf Rayet using a equation R136a1 will live for 100 hundred thousands of years.

#### Luminosity

These stars have luminosity of over 729,000 they range from 729,000 to around 82.3 Million.

#### Temperature

The temperature if these stars are very hot the coldest or lowest mass W type stars have temperatures of 65,200 or color of blue then the hottest have temperature's of 153,000 or a color of blue.

## R136a1 properties

R136a1 is the most massive star yet discovered

you can see more in the page R136a1

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Luminosity equation:

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#### Lifetimes for 435-90 Mass star

##### 435 Mass

0 YR:The star forms the mass is to high to do protostar

52,800 YR:The star becomes a Wolf Rayet

73,900 YR:The star becomes a LBV star or luminous blue variable

82,900 YR:The star goes into a exploding state where it turns white

92,900 YR:The star does a pair instability supernova where it leaves no black holes

103,000 YR:The supernova decays and the system is done

##### 400 Mass

0 YR:The star forms but skips the protostar phase

62,500 YR:The main sequence is finished and becomes a wolf Rayet

83,000 YR:The star becomes a LBV star

92,000 YR:The star goes into a exploding state

102,000 YR:the star explodes into a pair instability supernova (PISN)

112,000 YR:the supernova decays

##### 300 Mass star

0 YR:The star forms but skips the protostar phase

111,000 YR:The star is done with its main sequence and becomes a Wolf Rayet

155,000 YR:The star becomes a LBV star

168,000 YR:The star goes into a exploding state

178,000 YR:The star becomes a PI supernova (PI:Pair instability)

188,000 YR:The supernova decays

##### 200 Mass star

0 YR:The star forms

250,000 YR:The star is done with its main sequence and becomes a wolf Rayet

365,000 YR:The star goes into a exploding state

370,000 YR:The star finishes its shrinking by 50%

375,000 YR:The star explodes into a PI supernova

385,000 YR:The supernova decays

## Reference's

1. https://en.wikipedia.org/wiki/List\_of\_most\_massive\_stars

2. https://en.wikipedia.org/wiki/O-type\_main-sequence\_star

3. https://en.wikipedia.org/wiki/R136a1

4. r136a1 temperature safari search

5. Microsoft excel