2015A&A...577A..28J


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.26CET07:32:34

2015A&A...577A..28J - Astronomy and Astrophysics, volume 577A, 28-28 (2015/5-1)

Stellar winds on the main-sequence. II. The evolution of rotation and winds.

JOHNSTONE C.P., GUEDEL M., BROTT I. and LUEFTINGER T.

Abstract (from CDS):

We study the evolution of stellar rotation and wind properties for low-mass main-sequence stars. Our aim is to use rotational evolution models to constrain the mass loss rates in stellar winds and to predict how their properties evolve with time on the main-sequence. We construct a rotational evolution model that is driven by observed rotational distributions of young stellar clusters. Fitting the free parameters in our model allows us to predict how wind mass loss rate depends on stellar mass, radius, and rotation. We couple the results to the wind model developed in Paper I of this series to predict how wind properties evolve on the main-sequence. We estimate that wind mass loss rate scales with stellar parameters as {dot}(M)* ∝R*2 Ω*1.33 M*–3.36. We estimate that at young ages, the solar wind likely had a mass loss rate that is an order of magnitude higher than that of the current solar wind. This leads to the wind having a higher density at younger ages; however, the magnitude of this change depends strongly on how we scale wind temperature. Due to the spread in rotation rates, young stars show a large range of wind properties at a given age. This spread in wind properties disappears as the stars age. There is a large uncertainty in our knowledge of the evolution of stellar winds on the main-sequence, due both to our lack of knowledge of stellar winds and the large spread in rotation rates at young ages. Given the sensitivity of planetary atmospheres to stellar wind and radiation conditions, these uncertainties can be significant for our understanding of the evolution of planetary environments.

Abstract Copyright:

Journal keyword(s): solar wind - stars: activity - stars: evolution - stars: late-type - stars: winds, outflows - stars: rotation

Simbad objects: 23

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Number of rows : 23

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 869 OpC 02 19 00 +57 07.7           ~ 423 0
2 * kap01 Cet BY* 03 19 21.6963205 +03 22 12.715139 5.71 5.52 4.85 4.27 3.91 G5V 816 0
3 * eps Eri BY* 03 32 55.8449634 -09 27 29.731165 5.19 4.61 3.73 3.00 2.54 K2V 1670 1
4 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2925 0
5 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2605 0
6 M 37 OpC 05 52 18 +32 33.2   6.19 5.6     ~ 328 2
7 NGC 2168 OpC 06 08 54 +24 20.0           ~ 451 0
8 NGC 2323 OpC 07 02 47.5 -08 20 16           ~ 152 0
9 NGC 2516 OpC 07 58 04 -60 45.2           ~ 579 0
10 NGC 2547 OpC 08 09 52.360 -49 10 35.01           ~ 303 0
11 V* pi.01 UMa BY* 08 39 11.7043265307 +65 01 15.268273190 6.33 6.26 5.64 5.12 4.79 G0.5V 513 0
12 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1191 0
13 * bet Com PM* 13 11 52.3937856 +27 52 41.453553 4.92 4.84 4.25 3.77 3.47 F9.5V 840 0
14 * 61 Vir PM* 13 18 24.3142756 -18 18 40.304648 5.710 5.440 4.740     G6.5V 587 1
15 V* V645 Cen Fl* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 914 0
16 V* EK Dra BY* 14 39 00.2109485496 +64 17 29.977371998   8.243 7.604     G1.5V 372 0
17 * alf Cen ** 14 39 29.71993 -60 49 55.9990   0.4 -0.1     G2V+K1V 801 0
18 NGC 6811 OpC 19 37 17 +46 23.3   7.47 6.8     ~ 235 0
19 * 61 Cyg A BY* 21 06 53.9396100677 +38 44 57.897024357 7.50 6.39 5.21 4.19 3.54 K5V 936 0
20 * 61 Cyg B Fl* 21 06 55.2640651855 +38 44 31.362140913 8.63 7.40 6.03 4.86 3.55 K7V 664 1
21 V* V374 Peg Fl* 22 01 13.1233106147 +28 18 24.913041858       11.602   M3.5Ve 161 0
22 * eps Ind PM* 22 03 21.6542294981 -56 47 09.537018193   5.75 4.69     K5V 466 0
23 V* EV Lac Fl* 22 46 49.7311740821 +44 20 02.372223230   11.85 10.26 9.89   M4.0V 786 2

    Equat.    Gal    SGal    Ecl

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2020.01.26-07:32:34

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