J/A+A/515/A100 VI light curves of NGC 1039 solar-type stars (James+, 2010)
New rotation periods in the open cluster NGC 1039 (M 34), and a derivation of
its gyrochronology age.
James D.J., Barnes S.A., Meibom S., Lockwood G.W., Levine S.E.,
Deliyannis C., Platais I., Steinhauer A, Hurley B.K.
<Astron. Astrophys. 515, A100 (2010)>
=2010A&A...515A.100J 2010A&A...515A.100J
ADC_Keywords: Clusters, open ; Stars, G-type ; Photometry
Keywords: methods: data analysis - starspots - stars: fundamental parameters -
open clusters: individual: NGC 1039 (M 34)
Abstract:
Employing photometric rotation periods for solar-type stars in NGC
1039 [M 34], a young, nearby open cluster, we use its mass-dependent
rotation period distribution to derive the cluster's age in a distance
independent way, i.e., the so-called gyrochronology method.
We present an analysis of 55 new rotation periods, using light curves
derived from differential photometry, for solar type stars in the open
cluster NGC 1039 [M 34]. We also exploit the results of a
recently-completed, standardized, homogeneous BVIc CCD survey of the
cluster, performed by the Indiana Group of the WIYN open cluster
survey, in order to establish photometric cluster membership and
assign B-V colours to each photometric variable. We describe a methodology
for establishing the gyrochronology age for an ensemble of solar-type
stars. Empirical relations between rotation period, photometric colour
and stellar age (gyrochronology) are used to determine the age of
M 34.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 127 55 Astrometry, photometry and membership assignments
of M34 stars for which photometric periods could be
assigned in the Lowell campaign
tablea1.dat 42 27 Cluster membership assessments for Jones & Prosser
(1996, Cat. J/AJ/111/1193) stars in our period sample
lc/* . 150 *Individual light curves
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Note on lc/* : Three stars were observed twice, and have have two light curves
calculated with different periods.
Light curves of "F3_0116" are the second observation of star "F4_0169".
light curves of "F3_0169" are the second observation of star "F4_0327" and
light curves of "F3_0340" are the second observation of star "F4_0730".
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See also:
J/AJ/111/1193 : Proper motion in M34 (Jones+ 1996)
J/MNRAS/370/954 : VRIHalpha photometry of M34 (Irwin+, 2006)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1- 7 A7 --- Name Name (FN_NNNN) (G1)
8 A1 --- n_B-V [f] (B-V) derived from V-I (1)
10- 11 I2 h RAh Right ascension (J2000) (2)
13- 14 I2 min RAm Right ascension (J2000) (2)
16- 21 F6.3 s RAs Right ascension (J2000) (2)
23 A1 --- DE- Declination sign (J2000) (2)
24- 25 I2 deg DEd Declination (J2000) (2)
27- 28 I2 arcmin DEm Declination (J2000) (2)
30- 35 F6.3 arcsec DEs Declination (J2000) (2)
37- 38 A2 --- --- [JP]
40- 42 I3 --- JP96 ? JP identifier from Jones & Prosser (1996, Cat.
J/AJ/111/1193), Cl* NGC 1039 JP NNN in Simbad (3)
44- 49 F6.3 mag Vmag ?=99.999 V magnitude (4)
51- 55 F5.3 mag e_Vmag ?=9.999 rms uncertainty on Vmag (4)
57- 61 F5.3 mag B-V ?=9.999 B-V colour index (4)
63- 67 F5.3 mag e_B-V ?=9.999 rms uncertainty on B-V (4)
69- 73 F5.3 mag V-I ?=9.999 V-I colour index (4)
75- 79 F5.3 mag e_V-I ?=9.999 rms uncertainty on V-I (4)
81- 83 A3 --- Mph [Yes No] Photometric membership (5)
85- 92 A8 --- Mrv [Yes-sing Yes-bin No] Radial velocity
membership (5)
94- 95 A2 --- lI [lI] Available light curve derived from
long-I observations
97- 98 A2 --- lV [lV] Available light curve derived from
long-V observations
100-101 A2 --- sI [sI] Available light curve derived from
short-I observations
103-104 A2 --- sV [sV] Available light curve derived from
short-V observations
106-112 F7.4 d Per Photometric period (6)
114-119 F6.4 d e_Per rms uncertainty on Per (6)
123-127 F5.3 mag (B-V)0 ?=- Deredenned B-V colour index (6) (7)
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Note (1): B-V colours are determined using a field star V-I to B-V
relationship (Caldwell et al., 1993SAAOC..15....1C 1993SAAOC..15....1C), assuming
E(V-I)=1.25*E(B-V), and E(B-V)=0.07 (Canterna et al., 1979PASP...91..263C 1979PASP...91..263C)
Note (2): Astrometric data are derived from coordinate matches in the
SuperCosmos survey catalogs (Hambly et al., 2001MNRAS.326.1279H 2001MNRAS.326.1279H,
2001MNRAS.326.1315H 2001MNRAS.326.1315H, 2001MNRAS.326.1295H 2001MNRAS.326.1295H).
Note (3): JP 96 identifiers are for photometric variables which are
correlated with Jones & Prosser (1996, Cat. J/AJ/111/1193) sources.
Note (4): BVI photometric data are taken from the Indiana Group survey
(cf. Sect. 3).
Note (5): Membership assignments are based upon whether a target star lies
on (or close to) the V/B-V and/or V/V-I main sequence loci (see Fig.1)
or whether a target star has a radial velocity consistent with the
cluster's systemic velocity (Meibom et al., in prep.; see also
Sect.2.1 and Meibom et al., 2006ApJ...653..621M 2006ApJ...653..621M).
Note (6): From table3 of the paper
Note (7): EB-V=0.07 is adopted; Canterna et al. (1979PASP...91..263C 1979PASP...91..263C).
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Table 6: CFHT spectroscopic data products for M 34 candidate members
F3_0172 and F3_0215
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Name JP96 B-V Temp HJD RV EW(LiI+FeI) EW(FeI) EW(Li6708) N(Li)
mag K d km/s 0.1pm 0.1pm 0.1pm
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F3_0172 JP 49 0.811 5139 2455223.713 -8.4 115 13 102 2.003
F3_0215 JP 41 0.874 4946 2455223.712 -7.4 153 14 139 1.985
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Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- Name Name (FN_NNNN) (G1)
9- 10 A2 --- --- [JP]
12- 14 I3 --- JP96 JP identifier from Jones & Prosser (1996, Cat.
J/AJ/111/1193), Cl* NGC 1039 JP NNN in Simbad
16 A1 --- Mph [Y/N] Membership based on photometric data (1)
18- 19 A2 --- Mrv [Ys Yb N] Membership based on radial
velocity (1)
21 A1 --- MLi [Y/N] Membership based on radial velocity and
lithium 6708Å equivalent width, from
Jones et al. (1997AJ....114..352J 1997AJ....114..352J)
23- 27 F5.1 km/s RV ? Jones et al. (1997AJ....114..352J 1997AJ....114..352J)
radial velocity
29 A1 --- Mrv2 [Y/N] Membership based on radial velocity (2)
31- 32 I2 % Prv2 ? Membership probability based on radial
velocity (2)
34- 39 F6.3 mag Vmag V magnitude (1)
41- 42 I2 % Ppm Proper motion membership probabilities are
taken from Jones & Prosser (1996, Cat.
J/AJ/111/1193)
--------------------------------------------------------------------------------
Note (1): Data taken from Tables 2 & 3.
Note (2): Radial velocity membership assessments are based on a Gaussian
fit to the entire Jones et al. (1997AJ....114..352J 1997AJ....114..352J) radial velocity
sample (see also Fig. A1).
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Byte-by-byte Description of file: lc/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 9 F8.6 --- Phase [0/2] Phase
13- 20 F8.5 mag mag Instrumental i or v magnitude
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Global notes:
Note (G1): Identifier format is FX_YYYY, where "FX" are representations F3
and F4 for targets detected on M 34 western Field 3 or western Field 4
images, and "YYYY" are internal catalog numbers.
--------------------------------------------------------------------------------
History:
* 29-Jun-2010: Original files
* 12-Sep-2011: Period added in table2, from table3 of the paper
Acknowledgements:
David James, david9(at)hawaii.edu
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(End) Patricia Vannier [CDS] 25-Jun-2010