2001ApJ...559..353M


Query : 2001ApJ...559..353M

2001ApJ...559..353M - Astrophys. J., 559, 353-371 (2001/September-3)

Are magnetically active low-mass M dwarfs completely convective.

MULLAN D.J. and MacDONALD J.

Abstract (from CDS):

Stars on the main sequence are expected to be completely convective if their mass lies below a certain value, Mcc. Standard stellar structure codes suggest that Mcc is in the range 0.3-0.4 M. In the present paper we examine several nonstandard additions to stellar structure in order to quantify their effects on the value of Mcc. We find that by including magnetic field effects, Mcc may fall to values that are significantly smaller than the standard range. This result is of interest in understanding why coronae and chromospheres in active M dwarfs fail to exhibit detectable alterations at spectral class M3-M4. The structural properties of our magnetic models also explain why active M dwarfs tend to have radii that are larger than expected for their Teff values or Teff values that are too low for their radii. Our results lead us to predict that certain stars that are classified as late L or T stars may actually have masses of 0.1-0.15 M.

Abstract Copyright:

Journal keyword(s): Convection - Stars: Evolution - Stars: Interiors - Stars: Low-Mass, Brown Dwarfs

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* GQ And Er* 00 18 25.8244484426 +44 01 38.091239561   12.84 11.04 10.3   M3.5Ve 250 0
2 Wolf 47 Er* 01 03 19.8342607685 +62 21 55.831198996   15.34 13.21 12.4   M5V 173 0
3 V* YY Gem BY* 07 34 37.4475372002 +31 52 10.181030942 11.60 10.56 9.27 7.69 6.67 M0.5VeFe-2 832 0
4 V* CU Cnc SB* 08 31 37.5740891049 +19 23 39.398696822   12.83 11.809 11.592   M5Ve 206 0
5 IC 2602 OpC 10 42 58 -64 24.0           ~ 585 0
6 LP 731-58 Er* 10 48 12.6142482968 -11 20 09.609457904     15.784 16.01 11.25 M6.5V 149 0
7 Wolf 359 Er* 10 56 28.9208702274 +07 00 53.003285286 16.706 15.541 13.507 11.684 9.507 dM6 649 0
8 BD+44 2051B Er* 11 05 30.8856443432 +43 31 17.884318012   16.45 14.45 13.4   M6.0V 216 0
9 BD-11 3759 BY* 14 34 16.8115600986 -12 31 10.417356933 14.041 12.915 11.317 10.093 8.473 M3.5V 164 0
10 L 768-119 SB* 15 42 06.5440661894 -19 28 18.265293270 14.559 13.46 11.855 10.738 9.305 M3 75 0
11 V* CM Dra BY* 16 34 20.3299130309 +57 09 44.365524588   14.50 12.87 10.85 9.26 M4.5V 413 0
12 NAME Barnard's star BY* 17 57 48.4997994034 +04 41 36.111354228 12.497 11.24 9.511 8.298 6.741 M4V 709 2
13 V* BY Dra BY* 18 33 55.7719224141 +51 43 08.903033617 10.22 9.23   8.733   K4Ve+K7.5Ve 600 0
14 Wolf 896 PM* 20 56 46.5970399407 -10 26 54.749213101 14.112 12.999 11.487 10.428 9.106 dM2.5 88 0
15 LP 760-3 Er* 22 28 54.3488733354 -13 25 19.458646458   19.3 17.14     M6.5V 70 0
16 Ross 248 BY* 23 41 55.0361186415 +44 10 38.825189497   14.19   11.1   M5.0V 282 0

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2021.10.20-17:53:03

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