2022A&A...657L...3M


Query : 2022A&A...657L...3M

2022A&A...657L...3M - Astronomy and Astrophysics, volume 657, L3-3 (2022/1-1)

Gyrochronological dating of the stellar moving group Group X.

MESSINA S., NARDIELLO D., DESIDERA S., BARATELLA M., BENATTI S., BIAZZO K. and D'ORAZI V.

Abstract (from CDS):


Context. Gyrochronology is one of the methods currently used to estimate the age of stellar open clusters. Hundreds of new clusters, associations, and moving groups unveiled by Gaia and complemented by accurate rotation period measurements provided by recent space missions such as Kepler and TESS are allowing us to significantly improve the reliability of this method.
Aims. We use gyrochronology, that is, the calibrated age-mass-rotation relation valid for low-mass stars, to measure the age of the recently discovered moving group Group X.
Methods. We extracted the light curves of all candidate members from the TESS full frame images and measured their rotation periods using different period search methods.
Results. We measured the rotation period of 168 of a total of 218 stars and compared their period-colour distribution with those of two age-benchmark clusters, the Pleiades (125 Myr) and Praesepe (625 Myr), as well as with the recently characterised open cluster NGC 3532 (300 Myr).
Conclusions. As result of our analysis, we derived a gyro age of 300 ± 60 Myr. We also applied as independent methods the fitting of the entire isochrone and of the three brightest candidate members individually with the most precise stellar parameters, deriving comparable values of 250 Myr and 290 Myr, respectively. Our dating of Group X allows us to definitively rule out the previously proposed connection with the nearby but much older Coma Berenices cluster.

Abstract Copyright: © ESO 2022

Journal keyword(s): stars: low-mass - stars: rotation - stars: activity - stars: pre-main sequence - stars: evolution - open clusters and associations: general

VizieR on-line data: <Available at CDS (J/A+A/657/L3): tablea1.dat>

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

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3279 0
2 NGC 2516 OpC 07 58 06 -60 48.0           ~ 670 0
3 NGC 2548 OpC 08 13 39 -05 43.6           ~ 169 0
4 NGC 2632 OpC 08 40 13 +19 37.3           ~ 1449 0
5 NGC 3532 OpC 11 05 40 -58 42.4           ~ 320 0
6 Cl Melotte 111 OpC 12 24 03 +25 39.1           ~ 454 0
7 * 81 UMa * 13 34 07.3053955512 +55 20 54.364619400   5.569 5.588     A0V 83 0
8 HD 119765 * 13 43 54.7781349768 +52 03 51.888118176   6.027 6.018   5.98 A1V 61 0
9 * 84 UMa a2* 13 46 35.6567876472 +54 25 57.643558644   5.632 5.675     A0VpSrCrEu 155 0
10 [TPY2019] Group-X OpC 14 30 04.2 +55 03 04           ~ 6 0

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2023.01.31-01:33:21

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