J/A+A/657/L3 Rotation periods of Group X candidate members (Messina+, 2022)
Gyrochronological dating of the stellar moving group Group X.
Messina S., Nardiello D., Desidera S., Baratella M., Benatti S., Biazzo K.,
D'Orazi V.
<Astron. Astrophys., 657, L3 (2022)>
=2022A&A...657L...3M 2022A&A...657L...3M (SIMBAD/NED BibCode)
ADC_Keywords: Associations, stellar ; Photometry
Keywords: stars: low-mass - stars: rotation - stars: activity -
stars: pre-main sequence - stars: evolution -
open clusters and associations: general
Abstract:
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.
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
(125Myr) and Praesepe (625Myr), as well as with the recently
characterised open cluster NGC 3532 (300Myr).
As result of our analysis, we derived a gyro age of 300±60Myr. 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.
Description:
Group X is a nearby moving group (d∼101pc; Tang et al.,
2018ApJ...862..106T 2018ApJ...862..106T, Cat. J/ApJ/862/106).
We have explored the rotational properties of the late-type candidate
members of the recently discovered moving group Group X, which has a
total of 218 candidate members. All the candidate members were
observed by TESS in one or more sectors, and we extracted the light
curves from the FFIs using the PATHOS pipeline. The rotation period
search was done using three different methods, GLS, CLEAN, and ACF,
which provided rotation period measurements for 168 stars (150 with
grade A and 18 with grade B).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 64 173 Rotation periods of Group X candidate members
--------------------------------------------------------------------------------
See also:
J/ApJ/862/106 : Stellar and substellar members in Coma Berenices (Tang+, 2018)
Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq Sequential number
4- 5 A2 --- n_Seq [* a] Note on Seq (1)
7- 16 I10 --- TIC TIC number
18- 24 F7.4 mag Gmag Gaia G magnitude
26- 31 F6.3 mag (G-K)0 Deredenned G-K colour index
33- 39 F7.4 d Per Period
40 A1 --- n_Per [*] Note on Per (2)
42- 47 F6.4 d e_Per Period error
49 A1 --- Grade confidence grade
51- 64 A14 --- Sect TESS Sectors
--------------------------------------------------------------------------------
Note (1): Notes as follows:
* = unresolved systems in TESS photometry
a = (G-Ks)0 colour corrected for binarity
Note (2): The periods of 29 & 30 and to 148 & 149 are arbitrarily assigned,
these systems being unresolved.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 23-Feb-2022