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J/MNRAS/377/741     VIc photometry of NGC 2516               (Irwin+, 2007)

The Monitor project: rotation of low-mass stars in the open cluster NGC 2516. Irwin J., Hodgkin S., Aigrain S., Hebb L., Bouvier J., Clarke C., Moraux E., Bramich D.M. <Mon. Not. R. Astron. Soc., 377, 741-758 (2007)> =2007MNRAS.377..741I
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, Cousins Keywords: techniques: photometric - surveys - stars: rotation - open clusters and associations: individual: NGC 2516 Abstract: We report on the results of an i-band time-series photometric survey of NGC2516 using the Cerro Tololo Inter-American Observatory (CTIO) 4-m Blanco telescope and 8k Mosaic-II detector, achieving better than 1 per cent photometric precision per data point over 15≲i≲19. Candidate cluster members were selected from a V versus V-I colour-magnitude diagram over 16<V<26 (covering masses from 0.7M down to below the brown dwarf limit), finding 1685 candidates, of which we expect ∼1000 to be real cluster members, taking into account contamination from the field (which is most severe at the extremes of our mass range). Searching for periodic variations in these gave 362 detections over the mass range 0.15≲M/M≲0.7. The rotation period distributions were found to show a remarkable morphology as a function of mass, with the fastest rotators bounded by P>0.25d, and the slowest rotators for M≲0.5M bounded by a line of P∼M3, with those for M≳0.5M following a flatter relation closer to P ∼ constant. Models of the rotational evolution were investigated, finding that the evolution of the fastest rotators was well reproduced by a conventional solid body model with a mass-dependent saturation velocity, whereas core-envelope decoupling was needed to reproduce the evolution of the slowest rotators. None of our models were able to simultaneously reproduce the behaviour of both populations. Description: Photometric parameters and rotation periods are presented for 362 candidate members of NGC 2516. The period, i-band amplitude, interpolated mass and radius (from the NextGen models of Baraffe et al. (1998. Cat. J/A+A/337/403), derived using the I magnitudes), as used for the analysis in the paper, are given (where available). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 73 362 Positions, photometry and rotation periods
See also: J/A+A/312/818 : NGC 2516 X-ray sources (Dachs+, 1996) J/ApJ/588/1009 : Chandra X-ray observations of NGC 2516 (Damiani+, 2003) J/ApJ/606/466 : X-ray variability in NGC 2516 (Wolk+, 2004) J/A+A/450/993 : XMM survey of NGC 2516 (Pillitteri+, 2006) J/A+A/456/977 : XMM observations of NGC 2516 stars (Marino+, 2006) J/MNRAS/370/954 : The Monitor project: M34 (Irwin+, 2006) J/A+A/375/863 : Photometry in NGC 2516 (Jeffries+, 2001) J/AJ/123/290 : UBVI CCD photometry of NGC 2516 (Sung+, 2002) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 6 A6 --- --- [N2516-] 7- 14 A8 --- [IHA2007] Identifier in NGC 2526, N-N-NNNN 16- 17 I2 h RAh Right ascension (J2000) 19- 20 I2 min RAm Right ascension (J2000) 22- 26 F5.2 s RAs Right ascension (J2000) 28 A1 --- DE- Declination sign 29- 30 I2 deg DEd Declination (J2000) 32- 33 I2 arcmin DEm Declination (J2000) 35- 38 F4.1 arcsec DEs Declination (J2000) 40- 44 F5.2 mag Vmag Johnson V magnitude 46- 50 F5.2 mag Icmag Cousins I magnitude 52- 57 F6.3 d Per Photometric period 59- 63 F5.3 mag Iamp Sine curve fit amplitude (i-band) 65- 68 F4.2 solMass Mass Adopted mass from models 70- 73 F4.2 solRad Rad Adopted radius from models
Acknowledgements: Jonathan Irwin, jmi(at)
(End) Jonathan Irwin [IoA, Cambridge Univ.], Patricia Vannier [CDS] 09-Oct-2007
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