2011MNRAS.413.2595S


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.30CET23:08:18

2011MNRAS.413.2595S - Mon. Not. R. Astron. Soc., 413, 2595-2605 (2011/June-1)

Rotation periods for very low mass stars in Praesepe.

SCHOLZ A., IRWIN J., BOUVIER J., SIPOCZ B.M., HODGKIN S. and EISLOEFFEL J.

Abstract (from CDS):

We investigate the rotation periods of fully convective very low mass (VLM, M < 0.3 M) stars, with the aim to derive empirical constraints for the spin-down due to magnetically driven stellar winds. Our analysis is based on a new sample of rotation periods in the main-sequence cluster Praesepe (age 600 Myr). From photometric light curves obtained with the Isaac Newton Telescope, we measure rotation periods for 49 objects, among them 26 in the VLM domain. This enlarges the period sample in this mass and age regime by a factor of 6. Almost all VLM objects in our sample are fast rotators with periods <2.5 d, in contrast to the stars with M > 0.6 M in this cluster which have periods of 7–14 d. Thus, we confirm that the period–mass distribution in Praesepe exhibits a radical break at M ∼ 0.3–0.6 M. Our data indicate a positive period–mass trend in the VLM regime, similar to younger clusters. In addition, the scatter of the periods increases with mass. For the M > 0.3 M objects in our sample, the period distribution is probably affected by binarity. By comparing the Praesepe periods with literature samples in the cluster NGC 2516 (age ∼ 150 Myr) we constrain the spin-down in the VLM regime. An exponential rotational braking law P∝ exp (t/τ) with a mass-dependent τ is required to reproduce the data. The spin-down time-scale τ increases steeply towards lower masses; we derive τ ∼ 0.5 Gyr for 0.3 M and >1 Gyr for 0.1 M. These constraints are consistent with the current paradigm of the spin-down due to wind braking. We discuss possible physical origins of this behaviour and prospects for future work.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): stars: activity - brown dwarfs - stars: evolution - stars: low-mass - stars: rotation

Simbad objects: 56

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Number of rows : 56

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 NGC 1039 OpC 02 42 05 +42 45.7           ~ 375 0
2 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3037 0
3 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2714 0
4 M 37 OpC 05 52 18 +32 33.2   6.19 5.6     ~ 334 2
5 NGC 2323 OpC 07 02 47.5 -08 20 16           ~ 157 0
6 NGC 2516 OpC 07 58 04 -60 45.2           ~ 597 0
7 2MASS J08380800+2003505 BD? 08 38 08.0120972839 +20 03 50.568095188         15.54 M3.5 13 0
8 2MASS J08382186+2005356 BD? 08 38 21.8747684395 +20 05 35.764948268         16.25 M4.6 11 0
9 Cl* NGC 2632 JS 241 * 08 38 37.4714900924 +19 15 28.752036556   20.37 17.65     M3.2 17 0
10 EPIC 211984058 * 08 38 41.2779184294 +19 59 47.107356305           M4.6 12 0
11 2MASS J08385103+1918335 ** 08 38 51.03408 +19 18 33.5340           M4.5 9 0
12 2MASS J08385420+1951446 BD? 08 38 54.1999411755 +19 51 44.524899090         16.49 M4.3 13 0
13 2MASS J08390695+1947080 BD? 08 39 06.9574161661 +19 47 08.056021815         16.51 M4.8 11 0
14 V* AX Cnc Er* 08 39 09.8599027131 +19 46 58.968755566   14.80       M2.0 23 0
15 Cl* NGC 2632 HSHJ 253 * 08 39 15.1 +19 43 31           ~ 3 0
16 EPIC 211939989 * 08 39 15.3775320812 +19 19 28.485887139           M4.4 11 0
17 Cl* NGC 2632 HSHJ 256 * 08 39 15.7287697352 +19 20 02.571901616           M4.5 14 0
18 Cl* NGC 2632 HSHJ 258 * 08 39 18.5007285648 +19 22 44.275658771           M4.7 17 0
19 Cl* NGC 2632 WRS 5 * 08 39 30.9460088815 +19 58 01.843064255   21.03 18.23     M4.0 15 0
20 Cl* NGC 2632 JS 298 * 08 39 31.7517553329 +19 24 17.570127547   20.31 17.71     M2.8 19 0
21 Cl* NGC 2632 HSHJ 272 ** 08 39 34.66392 +19 48 00.2916           M3.3 11 0
22 Cl* NGC 2632 JS 309 Ro* 08 39 41.0330589413 +19 59 28.829295177   17.053 15.339     M0V 20 0
23 Cl* NGC 2632 JS 313 * 08 39 45.2100045967 +20 07 27.494465081   20.41 17.49     M3V 16 0
24 Cl* NGC 2632 JS 713 * 08 39 46.7415774425 +19 44 12.583230464   21.17 18.35     M3.9 9 0
25 Cl* NGC 2632 HSHJ 289 * 08 39 47.2970362362 +19 39 34.332491373           M3.7 10 0
26 2MASS J08395441+1927372 BD? 08 39 54.4076591906 +19 27 37.195358107         15.52 M3.8 17 0
27 Cl* NGC 2632 HSHJ 295 * 08 40 04.1653181451 +19 24 50.264362027   20.63 18.02     M3.4 19 0
28 Cl* NGC 2632 HSHJ 303 * 08 40 13.0991491937 +20 03 28.137269489           M3.1 14 0
29 K2-102 Ro* 08 40 13.4532692251 +19 46 43.712129004   14.318 13.200     K3V 37 0
30 Cl* NGC 2632 JS 719 * 08 40 15.2008075098 +20 05 13.969245997   21.50 18.29     M4.1 17 0
31 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1269 0
32 EPIC 211980450 * 08 40 39.3671021077 +19 56 23.801345114           M3.7 11 0
33 Cl* NGC 2632 JC 243 Ro* 08 41 13.190 +19 32 34.93   15.670 14.189     M0.6 19 0
34 Cl* NGC 2632 JS 430 * 08 41 24.4593699044 +20 07 49.498248362   18.87 16.46     M2.5 19 0
35 Cl* NGC 2632 HSHJ 368 * 08 41 26.0252494004 +19 59 15.072296935   20.98 18.23     M3.1 18 0
36 Cl* NGC 2632 HSHJ 370 * 08 41 26.7956624916 +19 52 36.573005265           M4.3 15 0
37 2MASS J08412873+1942490 * 08 41 28.7245014173 +19 42 48.898676583           M4.3 6 0
38 Cl* NGC 2632 HSHJ 376 * 08 41 32.5144343473 +20 06 06.773866580           M3.6 12 0
39 Cl* NGC 2632 JS 447 * 08 41 39.2164778402 +19 40 28.184805858   19.77 17.16     M2.9 8 0
40 EPIC 211973504 * 08 41 41.7390489952 +19 49 57.407249614           M3.4 11 0
41 EPIC 212003867 * 08 41 41.7456717447 +20 19 08.457061029           M6V 10 0
42 Cl* NGC 2632 HSHJ 396 * 08 41 50.5888688238 +19 29 39.491084981           M4.4 13 0
43 2MASS J08415223+1942283 * 08 41 52.2353150709 +19 42 28.137143073           M4.1 5 0
44 Cl* NGC 2632 HSHJ 397 * 08 41 53.5917930202 +19 36 30.559576300           M3.9 11 0
45 Cl* NGC 2632 WRS 7 * 08 42 04.4906576434 +19 32 42.689392261           M4.5 9 0
46 2MASS J08420470+1938007 * 08 42 04.6978717510 +19 38 00.780222922           M6.1 4 0
47 Cl* NGC 2632 HSHJ 412 * 08 42 13.1257495310 +19 18 52.754520853           M4.7 12 0
48 Cl* NGC 2632 HSHJ 419 * 08 42 21.1084767082 +20 03 20.863587618           M3.3 12 0
49 Cl* NGC 2632 HSHJ 421 * 08 42 23.8263895037 +19 23 12.444160860           M4.3 13 0
50 Cl* NGC 2632 HSHJ 423 * 08 42 29.6795140391 +19 19 52.491015472           M4.2 12 0
51 EPIC 211982727 * 08 42 29.8805774315 +19 58 31.723771332           M4.1 11 0
52 Cl* NGC 2632 JS 490 * 08 42 34.0288251110 +19 36 12.288782986   19.68 17.03     M2.6 13 0
53 Cl* NGC 2632 HSHJ 428 * 08 42 37.6160550486 +19 59 18.895460904           M3.5 14 0
54 Cl* NGC 2632 HSHJ 430 * 08 42 39.4400086116 +19 24 51.898666284           M3.9 21 0
55 2MASS J08425228+1951460 BD? 08 42 52.2859141297 +19 51 45.907005381   19.48 16.99   14.05 M2.5 15 0
56 Cl* NGC 2632 HSHJ 436 * 08 42 56.7478519645 +20 04 18.098951769           M3.6 11 0

    Equat.    Gal    SGal    Ecl

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2020.11.30-23:08:18

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