J/ApJ/822/81 PTF stellar rotation periods for Pleiades members (Covey+, 2016)
Why are rapidly rotating M dwarfs in the Pleiades so (infra)red? New period measurements confirm rotation-dependent color offsets from the cluster sequence. Covey K.R., Agueros M.A., Law N.M., Liu J., Ahmadi A., Laher R., Levitan D., Sesar B., Surace J. <Astrophys. J., 822, 81-81 (2016)> =2016ApJ...822...81C (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, VRI ; Photometry, infrared ; Stars, masses Keywords: open clusters and associations: individual: M44, Pleiades - stars: late-type - stars: low-mass - stars: rotation - starspots Abstract: Stellar rotation periods (Prot) measured in open clusters have proved to be extremely useful for studying stars' angular momentum content and rotationally driven magnetic activity, which are both age- and mass-dependent processes. While Prot measurements have been obtained for hundreds of solar-mass members of the Pleiades, measurements exist for only a few low-mass (<0.5 M☉) members of this key laboratory for stellar evolution theory. To fill this gap, we report Prot for 132 low-mass Pleiades members (including nearly 100 with M=<0.45 M☉), measured from photometric monitoring of the cluster conducted by the Palomar Transient Factory in late 2011 and early 2012. These periods extend the portrait of stellar rotation at 125 Myr to the lowest-mass stars and re-establish the Pleiades as a key benchmark for models of the transport and evolution of stellar angular momentum. Combining our new Prot with precise BVIJHK photometry reported by Stauffer et al. (2007, J/ApJS/172/663) and Kamai et al. (2014, J/AJ/148/30), we investigate known anomalies in the photometric properties of K and M Pleiades members. We confirm the correlation detected by Kamai et al. between a star's Prot and position relative to the main sequence in the cluster's color-magnitude diagram. We find that rapid rotators have redder (V-K) colors than slower rotators at the same V, indicating that rapid and slow rotators have different binary frequencies and/or photospheric properties. We find no difference in the photometric amplitudes of rapid and slow rotators, indicating that asymmetries in the longitudinal distribution of starspots do not scale grossly with rotation rate. Description: We monitored the Pleiades using time allocated to two PTF Key Projects: the PTF/M-dwarfs survey (Law et al. 2011ASPC..448.1367L, 2012ApJ...757..133L) and the PTF Open Cluster Survey (POCS; Agueros et al. 2011ApJ...740..110A; Douglas et al. 2014, J/ApJ/795/161). PTF was a time-domain experiment using the robotic 48-inch Samuel Oschin (P48) telescope at Palomar Observatory, CA, and involved real-time data-reduction and transient-detection pipelines and a dedicated follow-up telescope. The PTF infrastructure is described in Law et al. (2009PASP..121.1395L); we focus here on the components associated with the P48, which we used to conduct our monitoring campaign. The P48 is equipped with the CFH12K mosaic camera, which was significantly modified to optimize its performance on this telescope. The camera has 11 working CCDs, which cover a 7.26 square degree field of view with 92 megapixels at 1" sampling (Rahmer et al. 2008SPIE.7014E..4YR). Under typical observing conditions (1.1" seeing), it delivers 2" full-width half-maximum images that reach a 5σ limiting R∼21 mag in 60 s (Law et al. 2010SPIE.7735E..3ML). Objects: --------------------------------------------- RA (ICRS) DE Designation(s) --------------------------------------------- 03 47 00 +24 07.0 Pleiades = M 45 --------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 114 132 POCS Pleiades Periods table5.dat 79 119 Periods For Field Stars Observed During PTF Pleiades Campaign
See also: I/258 : Pleiades positions and proper motions (Wang+, 1996) J/A+AS/100/607 : Very low mass proper motion members in Pleiades (Hambly+, 1993) J/ApJS/85/315 : F, G and K dwarf stars of the Pleiades (Soderblom+ 1993) J/A+A/323/139 : K magnitude of Pleiades low-mass binaries (Bouvier+ 1997) J/A+A/329/101 : Masses of Pleiades members (Raboud+ 1998) J/MNRAS/313/347 : Pleiades low-mass stars and brown dwarfs (Pinfield+, 2000) J/MNRAS/342/1241 : Low-mass stars in M45 and M44 (Pinfield+, 2003) J/A+A/416/125 : RI photometry in alpha Per and Pleiades (Deacon+, 2004) J/ApJS/172/663 : Infrared observations of the Pleiades (Stauffer+, 2007) J/MNRAS/380/712 : ZYJHK photometry in Pleiades (Lodieu+, 2007) J/MNRAS/408/475 : HATNet Pleiades Rotation Period Catalogue (Hartman+, 2010) J/MNRAS/422/1495 : UKIDSS Galactic Clusters Survey Pleiades members (Lodieu+ 2012) J/AJ/148/30 : BVI photometry of 350 Pleiades stars (Kamai+, 2014) J/ApJ/795/161 : Activity and rotation in Praesepe and the Hyades (Douglas+, 2014) J/A+A/577/A148 : The Seven Sisters DANCe. I. Pleiades (Bouy+, 2015) J/A+A/596/A113 : The Seven Sisters DANCe. II. Pleiades (Barrado+, 2016) Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 16 A16 --- 2MASS 2MASS identifier (HHMMSSss-DDMMSSs) 18- 28 F11.8 deg RAdeg Right Ascension in decimal degrees (J2000) 30- 40 F11.8 deg DEdeg Declination in decimal degrees (J2000) 42- 46 F5.2 mag Vmag ? Johnson V-band magnitude 48- 55 A8 --- SourceV Source of V photometry (Kamai, Stauffer) (1) 57- 61 F5.2 mag Kmag K-band magnitude 63- 66 F4.2 mag e_Kmag ? Uncertainty in Kmag 68- 75 A8 --- SourceK Source of K photometry (2MASS, DANCe, Stauffer, UKIDSS) 77- 81 F5.2 mag V-K ? V-K color index 83- 86 F4.2 Msun Mass Mass 88 I1 --- Bin [0/1]? Photometric binary candidate flag (0=no, 1=yes) 90- 93 F4.2 d Prot1 POCS rotation period 95-100 F6.2 --- Power POCS periodogram peak power 102-105 F4.2 --- Amp POCS photometric amplitude 107-109 I3 --- Epoch [291/339] POCS epoch 111-114 F4.2 d Prot2 ? HATnet rotation period
Note (1): Source as follows: Kamai = Kamai et al. 2014 (J/AJ/148/30); Stauffer = Stauffer et al. 2007 (J/ApJS/172/663).
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 11 F11.8 deg RAdeg Right Ascension in decimal degrees (J2000) 13- 23 F11.8 deg DEdeg Declination in decimal degrees (J2000) 25- 29 F5.2 mag Rptf PTF R-band magnitude 31- 35 F5.3 mag e_Rptf Uncertainty in Rptf 37- 40 F4.2 d Prot POCS rotation period 42- 47 F6.2 --- Power POCS periodogram peak power 49- 52 F4.2 --- Amp POCS photometric amplitude 54- 56 I3 --- Epoch [291/338] POCS epoch 58- 77 A20 --- Star Star name (or comment) 79 A1 --- n_Star [ab] Note on Star (1)
Note (1): Note as follows: a = These are non-members with Prot measured by Hartman et al. (2010, J/MNRAS/408/475). The Prot derived here and in that work agree to better than 1% for all these stars; b = Known RR Lyrae.
History: From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 13-Feb-2018
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