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 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 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 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:
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FileName Lrecl Records Explanations
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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
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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 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 2007MNRAS.381.1638S, 2011MNRAS.413.2595S 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
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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%.
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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 [8] 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 [2000] Epoch of position
68- 78 A11 --- Binary Binary Type
80- 88 A9 --- Triple Triple Type
90-182 A93 --- Refs Source References (1)
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Note (1): Source References as follows:
abt1999 = 1999, J/ApJ/521/682
bolte1991 = 1991ApJ...376..514B 1991ApJ...376..514B
bouvier2001 = 2001, J/A+A/375/989
dickens1968 = 1968AJ.....73....6D 1968AJ.....73....6D
douglas2014 = 2014, J/ApJ/795/161
halbwachs2003 = 2003A&A...397..159H 2003A&A...397..159H
hodgkin1999 = 1999MNRAS.310...87H 1999MNRAS.310...87H
johnson1952 = 1952ApJ...116..640J 1952ApJ...116..640J
malavolta2016 = 2016, J/A+A/588/A118
mason1993 = 1993, J/AJ/106/637
mermilliod1990 = 1990A&A...235..114M 1990A&A...235..114M
mermilliod1994 = 1994A&A...283..515M 1994A&A...283..515M
mermilliod1999 = 1999A&A...352..479M 1999A&A...352..479M
mermilliod2009 = 2009, J/A+A/498/949
patience2002 = 2002, J/AJ/123/1570
peterson1984 = 1984AJ.....89..824P 1984AJ.....89..824P
peterson1989 = 1989AJ.....98.2156P 1989AJ.....98.2156P
pourbaix2004 = 2004A&A...424..727P 2004A&A...424..727P (see Cat. B/sb9)
quinn2012 = 2012, J/ApJ/756/L33
treanor1960 = 1960MNRAS.121..503T 1960MNRAS.121..503T
wilson1950 = 1950ApJ...111..221W 1950ApJ...111..221W
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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 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 2007MNRAS.381.1638S, 2011MNRAS.413.2595S 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
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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 2007MNRAS.381.1638S,2011MNRAS.413.2595S 2011MNRAS.413.2595S) (ProtS);
P = Agueros et al. (2011ApJ...740..110A 2011ApJ...740..110A) (ProtA).
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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).
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History:
From electronic version of the journal
References:
Agueros et al. Paper I. 2011ApJ...740..110A 2011ApJ...740..110A
Douglas et al. Paper II. 2014ApJ...795..161D 2014ApJ...795..161D Cat. J/ApJ/795/161
Kraus et al. Paper III. 2017ApJ...845...72K 2017ApJ...845...72K
Douglas et al. 2017ApJ...842...83D 2017ApJ...842...83D This catalog
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 29-Jan-2018