Query : 1997A&A...319..578V

1997A&A...319..578V - Astronomy and Astrophysics, volume 319, 578-588 (1997/3-2)

Constraints on mass loss from dMe stars: theory and observations.


Abstract (from CDS):

We show that the flux distribution of a wind from a cool star differs considerably from what is predicted by the theory for mass loss from hot stars. The differences are caused by the facts that 1) the mass loss rates are lower, resulting in smaller optical depths in the wind, and 2) for winds from cool stars the temperature of the wind is higher than the temperature of the star while for winds from hot stars the reverse holds. These differences result in substantial modifications of the flux distribution and imply that care must be exercised when applying the flux predictions by e.g. Wright and Barlow (1975MNRAS.170...41W) to winds from cool stars. By using observational constraints we show that the mass loss from cool dwarf stars equals at most 10–12M/yr. This is a factor hundred lower than previous estimates. At this rate the mass loss from dMe stars is of little importance for the enrichment of the interstellar medium. By solving the radiative transfer equations for stellar winds from dMe stars, we show that the inferred power-law flux distributions, based on radio, JCMT and IRAS data, cannot be reconciled with the flux distributions from a stellar wind of 10–10M/yr as was previously assumed. The maximum allowable mass loss rate is at most a few times 10–12M/yr which implies that the fluxes observed with JCMT, IRAS, and in the future with ISO, require a different interpretation than free-free emission from a stellar wind.

Abstract Copyright:

Journal keyword(s): stars: late-type - stars: mass-loss -ISM: general - infrared: stars - radio continuum: stars - ultraviolet: stars

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 V* V471 Tau EB* 03 50 24.9666549840 +17 14 47.430910716   10.258 9.373   8.393 K2V+DA 639 0
2 V* YZ CMi Er* 07 44 40.1723046464 +03 33 08.875227574 13.761 12.831 11.225 9.958 8.263 M4.0Ve 826 0
3 HD 152751 SB* 16 55 28.7575690 -08 20 10.787849 11.647 10.593 9.023 7.937 6.565 M3.5Ve 502 1
4 V* EV Lac Er* 22 46 49.7312610268 +44 20 02.374381562   11.85 10.26 9.89   M4.0V 846 2

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