Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..332..215h&link_type=abstract
The Fate of the Most Massive Stars, ASP Conference Series, Vol. 332, Proceedings of the conference held 23-28 May, 2004 in Grand
Astronomy and Astrophysics
Astronomy
9
Scientific paper
We discuss the recent revision to the effective temperature scale of O stars. The new temperature scale is cooler by 1000 K to >4000 K. The revision has arisen from the use of more accurate atmospheric models which allow for non-LTE line blanketing and stellar winds. We review quiescent mass loss in massive stars, highlighting some of the uncertainties in our current understanding. There is generally good agreement between observed mass-loss rates and those predicted using radiation driven wind theory. In particular, the general scaling of mass-loss rate with luminosity (˙M ∝ L1.8) is clearly seen in the observations of O stars. However, as we have improved the accuracy of the spectroscopic analyses, it is apparent that we do not have a full understanding of mass loss in massive stars. There is strong evidence that stellar winds are highly clumped, and there are potentially discrepancies (factor of 2 to 5) between predicted and observed mass-loss rates. Further, there is some evidence that mass-loss rates in low luminosity O stars may be an order of magnitude lower than predicted. While some discrepancies could be due to the neglect of stellar rotation, improvements to the spectroscopic models and in our understanding of stellar winds in massive stars are needed. An analysis of two O7 stars, AV 69 [OC7.5III((f))] and AV83 (O7 Iaf+), is used to highlight the role of rotation on surface abundances, and the evidence for wind clumping.
No associations
LandOfFree
Mass Loss in Massive Stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Mass Loss in Massive Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mass Loss in Massive Stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1301822