J/ApJ/842/83 Praesepe members rotational periods from K2 LCs (Douglas+, 2017)
Poking the beehive from space: K2 rotation periods for Praesepe. Douglas S.T., Agueros M.A., Covey K.R., Kraus A. <Astrophys. J., 842, 83-83 (2017)> =2017ApJ...842...83D (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, late-type ; Photometry, SDSS ; Stars, double and multiple ; Photometry, infrared Keywords: stars: evolution; stars: late-type; stars: rotation Abstract: We analyze K2 light curves for 794 low-mass (1≳M*≳0.1M☉) members of the ∼650Myr old open cluster Praesepe and measure rotation periods (Prot) for 677 of these stars. We find that half of the rapidly rotating ≳0.3M☉ stars are confirmed or candidate binary systems. The remaining ≳0.3M☉ fast rotators have not been searched for companions, and are therefore not confirmed single stars. We previously found that nearly all rapidly rotating 0.3M☉ stars in the Hyades are binaries, but we require deeper binary searches in Praesepe to confirm whether binaries in these two co-eval clusters have different Prot distributions. We also compare the observed Prot distribution in Praesepe to that predicted by models of angular-momentum evolution. We do not observe the clear bimodal Prot distribution predicted by Brown (2014ApJ...789..101B) for >0.5M☉ stars at the age of Praesepe, but 0.25-0.5M☉ stars do show stronger bimodality. In addition, we find that >60% of early M dwarfs in Praesepe rotate more slowly than predicted at 650Myr by Matt+ (2015ApJ...799L..23M), which suggests an increase in braking efficiency for these stars relative to solar-type stars and fully convective stars. The incompleteness of surveys for binaries in open clusters likely impacts our comparison with these models since the models only attempt to describe the evolution of isolated single stars. Description: We continue to use the Praesepe membership catalog presented in PaperII (Douglas+, 2014, J/ApJ/795/161), which includes 1130 cluster members with membership probabilities Pmem≥50% as calculated by Kraus & Hillenbrand (2007, J/AJ/134/2340) and 39 previously identified members too bright to be included by those authors in their catalog for the cluster. We assign these bright stars Pmem=100%. We also continue to use the photometry and stellar masses presented in Table 5 of Paper II. For most of our analysis, as in that work, we include only the 1099 stars with Pmem≥70%. K2 targeted Praesepe in its Campaign 5. We analyze the resulting long-cadence data for 794 Praesepe members. We present Prot for 677 K2 targets. Of these, 471 are new measurements. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 45 39 Praesepe members with discrepant Prot measurements table2.dat 182 172 Companions to Praesepe members with measured Prot table3.dat 228 794 Prot measurements for Praesepe stars targeted in K2
See also: B/sb9 : SB9: 9th Catalogue of Spectroscopic Binary Orbits (Pourbaix+ 2004-) IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017) J/ApJ/521/682 : Binaries in the Praesepe and Coma clusters (Abt+, 1999) J/A+A/375/989 : JHK photometry of Praesepe low-mass stars (Bouvier+, 2001) J/AJ/123/1570 : alpha Persei and Praesepe Clusters (Patience+, 2002) J/AJ/124/1570 : JHKs photometry in Praesepe (Adams+, 2002) J/AJ/134/2340 : Praesepe & Coma Berenices cluster membership (Kraus+, 2007) J/AJ/135/907 : Variables in Praesepe identified with KELT (Pepper+, 2008) J/A+A/498/949 : Velocities of F-K dwarfs in open clusters (Mermilliod+, 2009) J/AJ/141/166 : HATNet variability survey of K and M dwarfs (Hartman+, 2011) J/MNRAS/413/2218 : Stellar rotation in Hyades and Praesepe (Delorme+, 2011) J/ApJ/756/L33 : RVs of 2 hot Jupiters in Praesepe (Quinn+, 2012) J/MNRAS/432/1203 : Rotation periods of M-dwarf stars (McQuillan+, 2013) J/MNRAS/442/2081 : Praesepe members light curves (Kovacs+, 2014) J/ApJ/795/161 : Activity & rotation in Praesepe & the Hyades (Douglas+, 2014) J/A+A/588/A118 : Pr0211 RVs, photom. and activity indexes (Malavolta+, 2016) J/ApJ/822/47 : K2 rotation periods for 65 Hyades members (Douglas+, 2016) J/A+A/594/A100 : K2 new planetary and EB candidates (Barros+, 2016) J/AJ/152/113 : Pleiades members with K2 LCs. I. Periods (Rebull+, 2016) J/ApJ/839/92 : Praesepe members with K2 light curve data (Rebull+, 2017) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Name Literature name if any (G1) 9- 17 I9 --- EPIC ? EPIC identifier 19- 23 F5.2 d ProtA [1.5/25.4]? PTF, rotational period, from Agueros+ (2011ApJ...740..110A) (1) 25- 28 F4.2 d ProtD [2.4/10]? SWASP rotational period from Delorme+ (2011, J/MNRAS/413/2218) (1) 30- 33 F4.2 d ProtS [0.2/6]? Rotational period from Scholz+ (2007MNRAS.381.1638S, 2011MNRAS.413.2595S) (1) 35- 39 F5.2 d ProtK [5.8/19.2]? Rotational period from Kovacs+ (2014, J/MNRAS/442/2081) (1) 41- 45 F5.2 d Prot [0.4/18.3]? K2 rotational period; this work
Note (1): Only cluster members with at least two Prot measurements that differ by at least 10% are shown here. An additional 215 cluster members have at least two Prot measurements that agree to within 10%.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Name Literature name if any (G1) 10- 18 I9 --- EPIC ? EPIC identifier 20- 36 A17 --- 2MASS 2MASS Identifer (JHHMMSSss+DDMMSSs) if any 38- 39 I2 h RAh  Hour of Right Ascension (
J2000) 41- 42 I2 min RAm [22/52] Minute of Right Ascension ( J2000) 44- 48 F5.2 s RAs Second of Right Ascension ( J2000) 50 A1 --- DE- [+] Sign of Declination ( J2000) 51- 52 I2 deg DEd [16/25] Degree of Declination ( J2000) 54- 55 I2 arcmin DEm Arcminute of Declination ( J2000) 57- 61 F5.2 arcsec DEs Arcsecond of Declination ( J2000) 63- 66 I4 --- Epoch  Epoch of position 68- 78 A11 --- Binary Binary Type 80- 88 A9 --- Triple Triple Type 90-182 A93 --- Refs Source References (1)
Note (1): Source References as follows: abt1999 = 1999, J/ApJ/521/682 bolte1991 = 1991ApJ...376..514B bouvier2001 = 2001, J/A+A/375/989 dickens1968 = 1968AJ.....73....6D douglas2014 = 2014, J/ApJ/795/161 halbwachs2003 = 2003A&A...397..159H hodgkin1999 = 1999MNRAS.310...87H johnson1952 = 1952ApJ...116..640J malavolta2016 = 2016, J/A+A/588/A118 mason1993 = 1993, J/AJ/106/637 mermilliod1990 = 1990A&A...235..114M mermilliod1994 = 1994A&A...283..515M mermilliod1999 = 1999A&A...352..479M mermilliod2009 = 2009, J/A+A/498/949 patience2002 = 2002, J/AJ/123/1570 peterson1984 = 1984AJ.....89..824P peterson1989 = 1989AJ.....98.2156P pourbaix2004 = 2004A&A...424..727P (see Cat. B/sb9) quinn2012 = 2012, J/ApJ/756/L33 treanor1960 = 1960MNRAS.121..503T wilson1950 = 1950ApJ...111..221W
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Name Literature name if any (G1) 9- 17 I9 --- EPIC EPIC identifier 19- 22 F4.2 Msun Mass [0.1/1.5] Mass from Paper II, Table 5 (2014, J/ApJ/795/161) 24- 28 F5.2 mag r'mag [9.1/23.6] r' mag from Paper II, Table 5 (2014, J/ApJ/795/161) 30- 34 F5.2 mag Kmag [8.4/15.4] K band mag from Paper II, Table 5 (2014, J/ApJ/795/161) 36- 40 F5.2 d Prot1 [0.1/38.1]? Rotational Period, first periodogram peak 42- 47 F6.4 --- Pw1 [0.007/1]? Power, first periodogram peak 49 I1 --- Q1 [0/3]? Q flag, first periodogram peak (0=confirmed detection) (1) 51 A1 --- Clean? [YN ] There are no peaks >60% of the primary peak's power 53- 59 F7.5 --- Sig [0.005/0.02]? Minimum significance thresholds for the periodogram peaks 61- 67 F7.4 d Prot2 [0.1/27.1]? Rotational Period, second periodogram peak 69- 74 F6.4 --- Pw2 [0.009/0.4]? Power, second periodogram peak 76 I1 --- Q2 [0/1]? Q flag, second periodogram peak (0=confirmed detection) (1) 78 A1 --- MP? [YMN ] Multiple rotational periods? (M:maybe) 80 A1 --- SE? [YMN ] Spot evolution? Y:yes, M:maybe, N:no 82 A1 --- Bl? [YMN ] Blend? Y:yes, M:maybe, N:no 84- 87 A4 --- Bin? Binary status: conf=confirmed; cand=candidate 89- 95 F7.5 mag RawAmp [0.0009/0.3]? Photometric amplitude of variability (2) 97-104 F8.5 % SmAmp [0.005/11]? Smoothed amplitude of variability (3) 106 A1 --- P Period selected as the final period to plot (4) 108-112 F5.2 d ProtA [0.5/36]? PTF Rotational Period from Agueros+ (2011ApJ...740..110A) 114-118 F5.2 d ProtD [2.4/14.6]? SWASP Rotational Period from Delorme+ (2011, J/MNRAS/413/2218) 120-123 F4.2 d ProtS [0.2/6]? Rotational Period from Scholz+ (2007MNRAS.381.1638S, 2011MNRAS.413.2595S) 125-129 F5.2 d ProtK [2.5/18.2]? Rotational Period from Kovacs+ (2014, J/MNRAS/442/2081) 131-135 F5.2 mag Kpmag [9.4/19.2] Kepler magnitude 137-228 A92 --- Notes Notes on sources
Note (1): Quality flag as follows: 0 = visually confirmed detection; 1 = questionable detection; 2 = clearly spurious detection; 3 = no significant periodogram peak. Note (2): Photometric amplitude of variability uses the 10th and 90th percentiles (P10 and P90) of the light curve in counts, and Equation 2: 2.5*(log10(P90)-log10(P10))/2. Note (3): Smoothed amplitude is the percent difference between the maximum and minimum values of the smoothed phase-folded light curve. Note (4): Period selected as the final period to plot. Code as follows: 2 = K2 (Prot2); K = Kovacs et al. (2014, J/MNRAS/442/2081) (ProtK); D = Delorme et al. (2011, J/MNRAS/413/2218) (ProtD); S = Scholz et al. (2007MNRAS.381.1638S,2011MNRAS.413.2595S) (ProtS); P = Agueros et al. (2011ApJ...740..110A) (ProtA).
Global notes: Note (G1): Literature name given in Kraus & Hillenbrand (2007, J/AJ/134/2340). All are standard SIMBAD identifiers, except AD####, which correspond to stars in Adams et al. (2002, J/AJ/124/1570).
History: From electronic version of the journal References: Agueros et al. Paper I. 2011ApJ...740..110A Douglas et al. Paper II. 2014ApJ...795..161D Cat. J/ApJ/795/161 Kraus et al. Paper III. 2017ApJ...845...72K Douglas et al. 2017ApJ...842...83D This catalog
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 29-Jan-2018
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