The IR-colour-mass-loss relation of carbon-rich, dust-driven superwinds and a synthetic (J-K, MBol) diagram

Details The IR-colour-mass-loss relation of carbon-rich, dust-driven superwinds and a synthetic (J-K, MBol) diagram The IR-colour-mass-loss relation of carbon-rich, dust-driven superwinds and a synthetic (J-K, MBol) diagram

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...398..229s&link_type=abstract

Astronomy and Astrophysics, v.398, p.229-237 (2003)

Astronomy and Astrophysics

Astrophysics

9

Stars: Carbon, Stars: Circumstellar Matter, Stars: Evolution, Stars: Late-Type, Stars: Mass-Loss, Infrared: Stars

Scientific paper

We derive relations between mass-loss rates and IR-colours (J-K, H-K, K-L, L-M and K-[12]) for the carbon-rich, dust-driven stellar winds of extreme tip-AGB objects by applying a maximum-likelihood procedure to a representative set of 50 self-consistent, pulsating wind models. The J-K index shows the largest mass-loss related IR excess, which is consistent with observations. All synthetic IR-colours depend, in addition, on the luminosity of the individual model star. Consequently, the superwind mass-loss rates may be determined from observation by log {dot {M}} = -8.20 + 0.156 (J-K) - 0.463 MBol, for J-K >~ 4. As a case study for the interpretation of IR photometric data, we quantify the collective and individual tip-AGB mass-loss of the solar neighbourhood stellar population by means of a matching synthetic stellar sample, its IR properties and its present-day mass-loss distribution. The synthetic stars are generated on a grid of evolution tracks with a consistent mass-loss description (see Schröder et al. \cite{Sch99}; Wachter et al. \cite{Wac02}) and an IMF and SFR found in the local stellar population (Schröder & Sedlmayr \cite{Sch01}). The display of the tip-AGB stars in a (J-K, MBol) diagram could be compared directly with observations once appropriate data become available. On a basis of 1.4 million stars brighter than MV = 4.0, our synthetic present-day sample includes 5067 giant stars with B-V > 1.4, and the collective mass-loss rate is 5.0 x 10-4 Msun yr-1. There are 20 carbon-rich supergiants with an IR excess of J-K > 4.0 and a mass-loss rate well in excess of 10-6 Msun yr-1, including 10 dust-enshrouded, extreme tip-AGB stars with J-K > 6.0, seen in their short-lived (~30 000 yrs) superwind phase with dot {M} > 10-5 Msun yr-1. They produce about 50% of the collective mass-loss of the whole sample.

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