TY - GEN
T1 - The circumstellar environments of the cool hypergiants
T2 - Circumstellar media and late stages of massive stellar evolution
AU - Humphreys, Roberta M.
PY - 2007
Y1 - 2007
N2 - The cool hypergiants are the most luminous known stars in the upper HR Diagram in the apparent temperature range represented by the spectral types A to M. Most of these stars in this regime are unstable as evidenced by their high mass loss rates, variability, and in some cases large IR excesses and circumstellar ejecta. In this brief paper, I describe the complex circumstellar ejecta of two remarkable hypergiants IRC+10420 and VY CMa and the evidence for high mass loss episodes in their recent history apparently driven by large-scale convective activity.
AB - The cool hypergiants are the most luminous known stars in the upper HR Diagram in the apparent temperature range represented by the spectral types A to M. Most of these stars in this regime are unstable as evidenced by their high mass loss rates, variability, and in some cases large IR excesses and circumstellar ejecta. In this brief paper, I describe the complex circumstellar ejecta of two remarkable hypergiants IRC+10420 and VY CMa and the evidence for high mass loss episodes in their recent history apparently driven by large-scale convective activity.
KW - Circumstellar matter
KW - Stars: Mass loss
KW - Stars: Supergiants
UR - http://www.scopus.com/inward/record.url?scp=38349187844&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=38349187844&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:38349187844
SN - 9789703232758
T3 - Revista Mexicana de Astronomia y Astrofisica: Serie de Conferencias
SP - 6
EP - 11
BT - Circumstellar media and latetsages of massive stellar evolution
Y2 - 4 September 2006 through 8 September 2006
ER -