J/ApJ/733/L9 Stellar rotation for 71 NGC 6811 members (Meibom+, 2011)
The Kepler cluster study: stellar rotation in NGC 6811.
Meibom S., Barnes S.A., Latham D.W., Batalha N., Borucki W.J., Koch D.G.,
Basri G., Walkowicz L.M., Janes K.A., Jenkins J., Van Cleve J., Haas M.R.,
Bryson S.T., Dupree A.K., Furesz G., Szentgyorgyi A.H., Buchhave L.A.,
Clarke B.D., Twicken J.D., Quintana E.V.
<Astrophys. J., 733, L9 (2011)>
=2011ApJ...733L...9M 2011ApJ...733L...9M
ADC_Keywords: Clusters, open ; Stars, late-type ; Photometry, SDSS
Keywords: open clusters and associations: individual (NGC 6811) -
stars: activity - stars: late-type - starspots - stars: rotation
Abstract:
We present rotation periods for 71 single dwarf members of the open
cluster NGC 6811 determined using photometry from NASA's Kepler
mission. The results are the first from The Kepler Cluster Study,
which combines Kepler's photometry with ground-based spectroscopy for
cluster membership and binarity. The rotation periods delineate a
tight sequence in the NGC 6811 color-period diagram from ∼1 day at
mid-F to ∼11 days at early-K spectral type. This result extends to
1Gyr similar prior results in the ∼600Myr Hyades and Praesepe
clusters, suggesting that rotation periods for cool dwarf stars
delineate a well-defined surface in the three-dimensional space of
color (mass), rotation, and age. It implies that reliable ages can be
derived for field dwarf stars with measured colors and rotation
periods, and it promises to enable further understanding of various
aspects of stellar rotation and activity for cool stars.
Description:
The Kepler Cluster Study is a program to identify members of the four
open clusters within the Kepler field of view and to obtain and
analyze Kepler light curves for those members to measure stellar
rotation periods and search for transiting planets. The four clusters
are NGC 6866 (0.5Gyr), NGC 6811 (1Gyr), NGC 6819 (2.5Gyr), and NGC
6791 (9Gyr). We analyze four quarters of Kepler data (Q1-Q4)
spanning a period of 310 days from 2009 May 12 through 2010 March 20.
We are conducting a multi-epoch RV survey over a 1° diameter field
centered on NGC 6811 using the 6.5m MMT telescope and the Hectochelle
multi-object spectrograph.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 61 71 Data for the 71 members of NGC 6811 with
measured rotation periods
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
III/254 : 2nd Cat. of RVs with Astrometric Data (Kharchenko+, 2007)
J/A+A/529/A89 : Kepler satellite variability study (Debosscher+, 2011)
J/MNRAS/407/2109 : Kinematic study of open clusters (Vande Putte+, 2010)
J/A+A/504/681 : Integrated BVJHKs for 650 open clusters (Kharchenko+, 2009)
J/A+A/477/165 : Nearby open clusters tidal radii and masses (Piskunov+, 2008)
J/AJ/136/118 : Open clusters as galactic disk tracers. I. (Frinchaboy+, 2008)
J/A+A/438/1163 : Catalogue of Open Cluster Data (COCD) (Kharchenko+, 2005)
J/PAZh/25/115 : A study of the open cluster NGC 6811 (Glushkova+, 1999)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- KIC [9410241/9957187] Kepler identification number (1)
9- 10 I2 h RAh [19] Hour of Right Ascension (J2000)
12- 13 I2 min RAm [34/39] Minute of Right Ascension (J2000)
15- 19 F5.2 s RAs Second of Right Ascension (J2000)
21 A1 --- DE- [+] Sign of Declination (J2000)
22- 23 I2 deg DEd [45/46] Degree of Declination (J2000)
25- 26 I2 arcmin DEm Arcminute of Declination (J2000)
28- 32 F5.2 arcsec DEs Arcsecond of Declination (J2000)
34- 38 F5.2 mag gmag [13.22/17.38] g-band magnitude (SDSS system;
from Cat. V/133)
40- 44 F5.2 mag rmag [12.95/16.55] r-band magnitude (SDSS system;
from Cat. V/133)
46- 50 F5.2 d Per [0.92/16.4] Rotation period
52- 55 F4.2 d e_Per rms error (σ) in Per
57 I1 --- o_Per [2/7] Number of Per measurements over Q1-Q4
59- 61 A3 --- Mm [CM/CSM/SM] Radial-velocity membership class (2)
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Note (1): From the Kepler Input Catalog; http://archive.stsci.edu/kepler
(Brown et al. 2011AJ....142..112B 2011AJ....142..112B, see Cat. V/133).
Note (2): RV membership class as follows:
SM = Single Member,
CSM = Candidate Single Member,
CM = Candidate Member.
The distinction between classes is made based on the number of
radial-velocity measurements (NRV). SM stars have NRV≥4, CSM
stars have 2≤NRV<4, and CM stars have NRV=1. All SM and CSM
stars have radial-velocity standard deviation ≤1.5km/s. All 71
stars have radial-velocity membership probabilities above 50%.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 19-Nov-2012