2010A&A...515A.100J -
Astronomy and Astrophysics, volume 515, A100-100 (2010/6-1)
New rotation periods in the open cluster NGC 1039 (M34), 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. and HURLEY B.K.
Abstract (from CDS):
Employing photometric rotation periods for solar-type stars in NGC 1039 [M34], 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 [M34]. 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 M34. Based on its position in a colour-period diagram, each M34 member is designated as being either a solid-body rotator (interface or I-star), a differentially rotating star (convective or C-star) or an object which is in some transitory state in between the two (gap or g-star). Fitting the period and photometric colour of each I-sequence star in the cluster, we derive the cluster's mean gyrochronology age. Of the photometric variable stars in the cluster field, for which we derive a period, 47 out of 55 of them lie along the loci of the cluster main sequence in V/B-V and V/V-I space. We are further able to confirm kinematic membership of the cluster for half of the periodic variables [21/55], employing results from an on-going radial velocity survey of the cluster. For each cluster member identified as an I-sequence object in the colour-period diagram, we derive its individual gyrochronology age, where the mean gyro age of M34 is found to be 193±9 Myr. Using differential photometry, members of a young open cluster can be easily identified in a colour-magnitude diagram from their periodic photometric variability alone. Such periodicity can be used to establish a period-colour distribution for the cluster, which for M34, we have used to derive its gyrochronology age of 193±9Myr. Formally, our gyro age of M34 is consistent (within the errors) with that derived using several distance-dependent, photometric isochrone methods (250±67Myr).
Abstract Copyright:
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Journal keyword(s):
methods: data analysis - starspots - stars: fundamental parameters - globular clusters: individual: NGC 1039 (M34)
VizieR on-line data:
<Available at CDS (J/A+A/515/A100): table2.dat tablea1.dat lc/*>
Nomenclature:
Tables 2-3, A.1: [JBM2010] FF NNNN N=55 among (Nos F3 71 to F3 2310, F4 136 to F4 2226).
Simbad objects:
62
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