2022AJ....164...80R


Query : 2022AJ....164...80R

2022AJ....164...80R - Astron. J., 164, 80 (2022/September-0)

Rotation of Low-mass Stars in Upper Centaurus-Lupus and Lower Centaurus-Crux with TESS.

REBULL L.M., STAUFFER J.R., HILLENBRAND L.A., CODY A.M., KRUSE E. and POWELL B.P.

Abstract (from CDS):

We present stellar rotation rates derived from Transiting Exoplanet Survey Satellite (TESS) light curves for stars in Upper Centaurus-Lupus (UCL; ∼136 pc, ∼16 Myr) and Lower Centaurus-Crux (LCC; ∼115 pc, ∼17 Myr). We find spot-modulated periods (P) for ∼90% of members. The range of light-curve and periodogram shapes echoes that found for other clusters with K2, but fewer multiperiod stars may be an indication of the different noise characteristics of TESS, or a result of the source selection methods here. The distribution of P as a function of color as a proxy for mass fits nicely in between that for both older and younger clusters observed by K2, with fast rotators being found among both the highest and lowest masses probed here, and a well-organized distribution of M-star rotation rates. About 13% of the stars have an infrared excess, suggesting a circumstellar disk; this is well matched to expectations, given the age of the stars. There is an obvious pileup of disked M stars at P ∼ 2 days, and the pileup may move to shorter P as the mass decreases. There is also a strong concentration of disk-free M stars at P ∼ 2 days, hinting that perhaps these stars have recently freed themselves from their disks. Exploring the rotation rates of stars in UCL/LCC has the potential to help us understand the beginning of the end of the influence of disks on rotation, and the timescale on which stars respond to unlocking.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Stellar rotation - Stellar associations - Low mass stars

VizieR on-line data: <Available at CDS (J/AJ/164/80): table2.dat table3.dat table4.dat table5.dat table6.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3411 0
2 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 3050 0
3 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4376 0
4 NGC 2632 OpC 08 40 13.0 +19 37 16           ~ 1546 0
5 NAME eta Cha Association OpC 08 42 32.9 -78 57 47           ~ 361 0
6 IC 2602 OpC 10 42 27.1 -64 25 34           ~ 669 0
7 NAME TW Hya Association As* 11 01.9 -34 42           ~ 937 0
8 2MASS J11393015-5903446 * 11 39 30.1507032672 -59 03 44.612772480           ~ 4 0
9 NAME eps Cha Association OpC 11 59 51 -78 12.4           ~ 158 1
10 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 476 1
11 UCAC4 165-093158 Y*? 12 43 30.4465294440 -57 03 18.586694196   16.071 14.612 14.458   ~ 5 0
12 UCAC4 094-038759 Y*? 12 57 12.4023859440 -71 19 34.549177260           ~ 5 0
13 2MASS J13373839-4736297 * 13 37 38.3988543864 -47 36 29.715851232           ~ 9 0
14 NAME Upper Centaurus Lupus As* 15 24 -41.9           ~ 469 1
15 Sz 127 Y*O 15 57 30.3407870926 -42 10 32.444768724   16.12 14.81 14.96   M5e 10 0
16 NAME Lupus Complex SFR 16 03 -38.1           ~ 712 0
17 NAME Upper Sco Association As* 16 12 -23.4           ~ 1359 1
18 NAME rho Oph Cluster Cl* 16 26 22 -24 23.7           ~ 70 0
19 UCAC4 238-106125 Y*? 16 30 03.7158737784 -42 26 58.698520728   14.787 13.402 13.132   ~ 5 0
20 M 8 OpC 18 03 37 -24 23.2           ~ 611 1

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