J/A+A/520/A15 RACE-OC project: YSOs within 100pc (Messina+, 2010)
RACE-OC project:
Rotation and variability of young stellar associations within 100pc.
Messina S., Desidera S., Tutatto M., Lanzafame A.C., Guinan E.F.
<Astron. Astrophys. 520, A15 (2010)>
=2010A&A...520A..15M 2010A&A...520A..15M
ADC_Keywords: Clusters, open ; Stars, late-type ; Stars, variable
Keywords: stars: activity - stars: late-type - stars: rotation - starspots -
open clusters and associations: general - stars: pre-main sequence
Abstract:
Examining the angular momentum of stars and its interplay with
their magnetic fields represent a promising way to probe the
stellar internal structure and evolution of low-mass stars.
We attempt to determine the rotational and magnetic-related activity
properties of stars at different stages of evolution.We focused our
attention primarily on members of clusters and young stellar
associations of known ages. In this study, our targets are 6 young
loose stellar associations within 100pc and with ages in the range
8-70Myr: TW Hydrae (∼8Myr), beta Pictoris (∼10Myr), Tucana/Horologium,
Columba, Carina (∼30Myr), and AB Doradus (∼70Myr). Additional
rotational data for alpha Persei and the Pleiades from the literature
are also considered.
Description:
Rotational periods of stars exhibiting rotational modulation due to
photospheric magnetic activity (i.e., starspots) were determined by
applying the Lomb-Scargle periodogram technique to photometric
time-series data obtained by the All Sky Automated Survey (ASAS). The
magnetic activity level was derived from the amplitude of the V
lightcurves. The statistical significance of the rotational evolution
at different ages was inferred by applying a two-sided
Kolmogorov-Smirnov test to subsequent age-bins.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
periods.dat 132 204 Summary of rotation periods
(tables 3-8 of the paper)
tablea.dat 119 147 Summary of parameters for the 6 associations
(tables A1-A6 of the paper)
tablea7.dat 83 918 Summary of periods in individual segments
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See also:
J/A+A/483/253 : RACE-OC project: NGC 2099 variables BV phot. (Messina+, 2008)
J/A+A/513/A29 : RACE-OC project: M11 (NGC6705) (Messina+, 2010)
II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005)
Byte-by-byte Description of file: periods.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Target Target name
17- 29 A13 --- ASAS ASAS ID number (HHMMSS+DDMM.m)
31- 39 F9.6 d Per ? Rotation period
41- 48 F8.6 d e_Per ? Error on Per
50- 51 I2 --- Nper ? Number of period detection
52 A1 --- --- [/]
53- 54 I2 --- Ntot ? Total number of time segments
56- 59 F4.2 mag Vamp ? V-band light curve amplitude
61- 65 F5.3 mag Vsig ? Photometric precision
67- 71 F5.2 mag Vmag ? V brightest magnitude
73- 76 F4.2 mag B-V ? B-V color index
78- 84 A7 --- SpType MK spectral type
85- 89 A5 --- bin Multiplicity code (1)
91-109 A19 --- n_Per Note on period (2)
110-118 A9 --- VarName Variable's name
120-125 A6 --- Note Note (3)
126-132 A7 --- MGR Membership to association (G1)
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Note (1): Multiplicity code as follows:
V = visual companion
S = single star
B = binary system
T = triple system
Q = quadruple system
EB = Eclipsing binary
SB = Spectrsocopic binary
Note (2): Abbreviations used in the notes:
Plit = period as given in the literature
PACVS = period in ACVS (ASAS catalog of variable stars)
Note (3): Notes as follows:
a = rejected member and excluded from rotation period distribution
b = period undetected in the periodogram of the complete timeseries
c = vsini inconsistent with veq=2πR/P
d = tidally-locked binary system
e = not included in the member list because of incomplete kinematic
information
f = inferred from spectral type
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Byte-by-byte Description of file: tablea.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Assoc Association code (G1)
9- 23 A15 --- Target Target's name
25- 39 A15 --- OName Target's other name
41- 42 I2 h RAh Right ascension (J2000.0)
44- 45 I2 min RAm Right ascension (J2000.0)
47- 51 F5.2 s RAs Right ascension (J2000.0)
53 A1 --- DE- Declination sign (J2000.0)
54- 55 I2 deg DEd Declination (J2000.0)
57- 58 I2 arcmin DEm Declination (J2000.0)
60- 64 F5.2 arcsec DEs Declination (J2000.0)
65 A1 --- n_Pos [*] Position corrected by CDS
66- 70 F5.2 mag Vmag Johnson V magnitude
72- 75 F4.2 mag B-V Johnson B-V colour index
77- 80 F4.2 mag V-Ic Johnson-Cousins V-I colour index
82- 86 F5.2 mag VMAG Absolute V magnitude
88- 93 F6.2 pc Dist Heliocentric distance
95-100 F6.2 km/s vsini ?=- Projected equatorial velocity
102-104 F3.1 solMass Mass ?=- Derived stellar mass
106-108 F3.1 solRad Rad ?=- Derived stellar radius
110-115 A6 --- SpType MK spectral type
117 A1 --- n_Mm [ab] Individual note on membership (2)
119 A1 --- Mm [mn] membership code, m=confirmed member
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Note (2): Notes as follows:
a = TYC 5882 1169 1: although previously classified as a member of
the Tuc/Hor association, it is proposed by Torres et al.
(2008, ASP Monograph Publications, 5, 757, [0808.3362])
as high-probability member of Columba association.
b = HIP 32235: and HIP 33737 are members of Tuc/Hor according to
Zuckerman & Song (2004ARA&A..42..685Z 2004ARA&A..42..685Z). In the present study,
they are assumed to be members of Carina according to
Torres et al. (2008, ASP Monograph Publications, 5, 757,
[0808.3362]).
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Byte-by-byte Description of file: tablea7.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Target Target's name
18- 30 A13 --- ASAS ASAS number (HHMMSS+DDMM.m)
32- 43 F12.4 d MJD.ini Initial Modified Julian date
45- 56 F12.4 d MJD.fin Final Modified Julian date
58- 64 F7.4 d Per Rotation period
66- 71 F6.4 d e_Per Uncertainty on Per
73- 77 F5.2 --- PN ?=- Normalized power (1)
79- 83 F5.2 --- Fap Power at 99% confidence level (1)
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Note (1): power PN(ω) in the Lomb-Scargle periodogram technique
for the angular frequency ω corresponding to the period.
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Global Notes:
Note (G1): The association names are:
TWA = TW Hydrae (table A1)
BPIC = β Pictoris (table A2)
TUC/HOR = Tucana/Horologium (table A3)
COL = Columba (table A4)
CAR = Carina (table A5)
ABDOR = AB Doradus (table A6)
History:
* 15-Nov-2010: On-line version
* 13-Feb-2012: position of TYC 1355-214-1 corrected
Acknowledgements:
Sergio Messina, sme(at)oact.inaf.it
(End) Patricia Vannier [CDS] 12-Nov-2010