<p>At the end of the protostar phase a vigorous outflow from the star develops called the T-Tauri Wind and this could cut off accretion.  Eventually, it develops into a normal star and the strong wind dies down.  Material that was not totally blown away could then continue to  fall down and be accreted</p>

CC BY-SA 3.0
2014-10-06T00:56:26.550Z
Thanks Ed, however could you please share your sources so that I can read further?
Abhi.S
CC BY-SA 3.0
2014-10-07T02:44:12.680Z
http://en.wikipedia.org/wiki/T_Tauri_star  and http://en.wikipedia.org/wiki/Stellar_wind
eshaya
CC BY-SA 3.0
2014-10-05T17:22:52.667Z
2014-10-05T17:22:52.667Z
eshaya
<p>I'm reading material that is seemingly contradictory.  Some sources indicate that the evolution of a protostar to a main sequence star is characterised by a stellar wind that precludes the accretion of further in-falling material.  That is, the (young) star now has a constant mass.  However, other sources suggest that material may continue to accrete for a (brief) period after the protostar has become a main sequence star.  </p>

<p>Can someone please confirm the actual process?</p>

CC BY-SA 3.0
2014-10-05T02:08:10.453Z
Could you provide information on what materials you are reading? It may be useful in clarifying the contradiction.
Mitch Goshorn
CC BY-SA 3.0
2014-10-05T08:05:02.640Z
Hi Mitch, my sources indicating the cessation of accretion once the stellar wind is formed include "Pathways to Astronomy" (Schneider & Arny), and the attached link: http://en.wikipedia.org/wiki/Protostar#Classes_of_Protostars.  The potential for accretion to continue for a brief period after the protostar has become a main sequence star is suggested here: http://www2.cose.isu.edu/~hackmart/stellarevo.pdf
Abhi.S
CC BY-SA 3.0
2014-10-05T12:50:25.577Z
Is this the part that threw you off? _"Material continues to flow onto new stars for some
time after ignition.. The energy from infalling material
exceeds, in some cases, the energy from nuclear
fusion in young stars.."_
Mitch Goshorn
CC BY-SA 3.0
2014-10-06T00:55:38.300Z
Yes, that was the paragraph confusing me!  However, I think Ed has clarified my confusion.
Abhi.S
<protostar><main-sequence>
Accretion of in-falling material for a young main sequence star
Abhi.S
# Accretion of in-falling material for a young main sequence star

(Asked by: username_0 on 2014-10-05)

I'm reading material that is seemingly contradictory. Some sources indicate that the evolution of a protostar to a main sequence star is characterised by a stellar wind that precludes the accretion of further in-falling material. That is, the (young) star now has a constant mass. However, other sources suggest that material may continue to accrete for a (brief) period after the protostar has become a main sequence star.

Can someone please confirm the actual process?

**Tags:** protostar, main-sequence

> **Comments:**
> **username_1**: Could you provide information on what materials you are reading? It may be useful in clarifying the contradiction.  
> **username_0**: Hi Mitch, my sources indicating the cessation of accretion once the stellar wind is formed include "Pathways to Astronomy" (Schneider & Arny), and the attached link: http://en.wikipedia.org/wiki/Protostar#Classes_of_Protostars.  The potential for accretion to continue for a brief period after the protostar has become a main sequence star is suggested here: http://www2.cose.isu.edu/~hackmart/stellarevo.pdf  
> **username_1**: Is this the part that threw you off? _"Material continues to flow onto new stars for some time after ignition.. The energy from infalling material exceeds, in some cases, the energy from nuclear fusion in young stars.."_  
> **username_0**: Yes, that was the paragraph confusing me!  However, I think Ed has clarified my confusion.  

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## 1 answers

### Answer by username_2 on 2014-10-05. Score: 2

At the end of the protostar phase a vigorous outflow from the star develops called the T-Tauri Wind and this could cut off accretion. Eventually, it develops into a normal star and the strong wind dies down. Material that was not totally blown away could then continue to fall down and be accreted

> **Comments:**
> **username_0**: Thanks Ed, however could you please share your sources so that I can read further?  
> **username_2**: http://en.wikipedia.org/wiki/T_Tauri_star  and http://en.wikipedia.org/wiki/Stellar_wind  

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