J/A+A/681/A13 UBC 1 membership and rotation (Fritzewski+, 2024)
Age-dating the young open cluster UBC 1 with g-mode asteroseismology,
gyrochronology, and isochrone fitting.
Fritzewski D.J., Van Reeth T., Aerts C., Van Beeck J., Gossage S., Li G.
<Astron. Astrophys. 681, A13 (2024)>
=2024A&A...681A..13F 2024A&A...681A..13F (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, late-type ; Stars, variable ;
Photometry ; Optical
Keywords: asteroseismology - stars: variables: general - stars: rotation -
open clusters and associations: individual: UBC 1 -
techniques: photometric
Abstract:
UBC 1 is an open cluster discovered in Gaia data and located near the
edge of the Transiting Exoplanet Survey Satellite's (TESS)
continuous viewing zone. We aim to provide age constraints for this
poorly studied open cluster from the combination of gravity-mode
(g-mode) asteroseismology, gyrochronology, and isochrone fitting.
We established the members of UBC 1 from a spatial-kinematic filtering
and estimate the cluster age and its parameters. Firstly, we fitted
rotating isochrones to the single star cluster sequence. Secondly,
using TESS time-series photometry, we explored the variability of the
upper main sequence members and identified potential g-mode pulsators.
For one star, we found a clear period spacing pattern that we used to
deduce the buoyancy travel time, the near-core rotation rate, and an
asteroseismic age. For a third independent age estimate, we employed
the rotation periods of low-mass members of UBC 1.
Based on isochrone fitting, we find logt=8.1±0.4, where the large
uncertainty occurs because UBC 1 does not host evolved stars. From
asteroseismology of one g-mode pulsator, we find a constrained age of
logt=8.24-0.14+0.43. From gyrochronology based on 17 cool star
cluster members, we estimate logt=8.35-0.25+0.16. Combined, all
three methods lead to a consistent age in the range of 150∼300Myr.
Our results show that even a single cluster member with identified g
modes can improve age-dating of young open clusters. Combining the
gyrochronology of low-mass members with asteroseismology of
intermediate-mass members is a powerful tool for young open cluster
modelling, including high-precision age-dating.
Description:
The membership table includes the positions and velocity dispersions
of all 132 stars classified as members of UBC1 in our work (Table 1).
The periods table holds the rotation periods for 17 cool star members
(Table 2).
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 69 132 List of cluster members of UBC1
table2.dat 27 17 Rotation periods for cool star cluster members
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- ID ID number used in paper
5- 12 A8 --- --- [Gaia DR3]
14- 32 I19 --- GaiaDR3 Gaia DR3 designation (Cat. I/355)
34- 42 F9.5 deg RAdeg Right ascension from Gaia DR3
(ICRS) at Ep=2016.0 (Cat. I/355)
44- 51 F8.5 deg DEdeg Declination from Gaia DR3
(ICRS) at Ep=2016.0 (Cat. I/355)
53- 57 F5.3 km/s sigma2D 2D velocity dispersion with respect to the
cluster mean motion
59- 63 F5.3 km/s sigma3D ? 3D velocity dispersion with respect to the
cluster mean motion
64- 69 F6.3 mas plx Parallax from Gaia DR3 (Cat. I/355)
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- ID ID number from members table
5- 13 F9.5 deg RAdeg Right ascension from Gaia DR3 (ICRS)
at Ep=2016.0 (Cat. I/355)
15- 22 F8.5 deg DEdeg Declination from Gaia DR3 (ICRS)
at Ep=2016.0 (Cat. I/355)
24- 27 F4.2 d Prot Rotation period
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Acknowledgements:
Dario Fritzewski, dario.fritzewski(at)kuleuven.be
(End) Patricia Vannier [CDS] 08-Nov-2023