J/MNRAS/473/2465 New young stars in Pisces Moving Group (Binks+, 2018)
Searching for new young stars in the Northern hemisphere:
The Pisces moving group.
Binks A.S., Jeffries R.D., Ward J.L.
<Mon. Not. R. Astron. Soc. 473, 2465 (2018)>
=2018MNRAS.473.2465B 2018MNRAS.473.2465B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, pre-main sequence ; Stars, late-type
Keywords: stars: low-mass - stars: pre-main-sequence
Abstract:
Using the kinematically unbiased technique described in Binks,
Jeffries & Maxted (2015MNRAS.452..173B 2015MNRAS.452..173B, Cat. J/MNRAS/452/173), we
present optical spectra for a further 122 rapidly-rotating (rotation
periods < 6 days), X-ray active FGK stars, selected from the SuperWASP
survey. We identify 17 new examples of young, probably single stars
with ages of <200Myr and provide additional evidence for a new
northern hemisphere kinematic association: the Pisces Moving Group
(MG). The group consists of 14 lithium-rich G- and K-type stars, that
have a dispersion of only ∼3km/s in each Galactic space velocity
coordinate. The group members are approximately co-eval in the
colour-magnitude diagram, with an age of 30-50 Myr, and have similar,
though not identical, kinematics to the Octans-Near MG.
Description:
In the paper, we presented tabular data for all targets in our sample
that were measured to be younger than 200Myr based on analysis of
their Li EWs and were unlikely to be tidally-locked short-period
binary (TLSPB) systems based on two or more RV measurements either
from our observations or previous measurements in the literature. In
these catalogs we present the equivalent data from tables 1, 3, 4, 5
and 6 for targets that were either not measured as younger than
200Myr, but were not identified as TLSPBs, or were younger than 200Myr
but have indeterminate radial velocity measurements. For full details
please see the publication.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
suppdata.dat 352 87 Compiled astrometric, kinematic, spectroscopic
and photometric data
rvs.dat 48 100 Compiled radial velocity data for the 87 targets
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See also:
J/MNRAS/452/173 : Nearby young stars in Northern hemisphere (Binks+, 2015)
Byte-by-byte Description of file: suppdata.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name of Target (HHMM+DDMM for SWHHMM+DDMM)
11- 14 I4 --- AgeG Upper age limit from gyrochronology
16 A1 --- l_AgeLi Limit flag on Li-based age (1)
18- 21 I4 Myr b_AgeLi Lower age limit from lithium (if applicable)
23- 26 I4 Myr B_AgeLi ? Upper age limit from lithium
28 A1 --- l_AgeHa Limit flag on H-alpha based age (1)
30- 32 I3 Myr b_AgeHa ? Lower age limit from H-alpha (if applicable)
34- 36 I3 Myr B_AgeHa ? Upper age limit from H-alpha (if applicable)
38- 42 F5.2 0.1nm EWHa H-alpha equivalent width (Å) (2)
44- 47 F4.2 0.1nm e_EWHa ? H-alpha equivalent width error (only
available when there are 2 or more spectra)
49 A1 --- l_EWLi Upper limit flag on Li equivalent width (Å)
51- 53 I3 0.1pm EWLi Li equivalent width (mÅ), or 2-sigma upper
limit calculated using Cayrel de
Strobel (1988IAUS..132..345C 1988IAUS..132..345C) formulation
55- 57 I3 0.1pm cEWLi Li equivalent width subsequent to
deblending the 6707.4 FeI line (mÅ), using
the formulation in Soderblom et al.
(1993AJ....106.1059S 1993AJ....106.1059S)
59- 60 I2 0.1pm e_EWLi ? Error bar on the Li equivalent width (mA),
calculated using Cayrel de Strobel
(1988IAUS..132..345C 1988IAUS..132..345C) formulation
62 I1 --- xEWLi Code describing how the Lithium equivalent
width is calculated (3)
64- 68 F5.2 --- ALi ? Lithium abundance, calculated using
12+log(N(Li)/N(H)) with NLTE corrections
from Carlsson et al. (1994A&A...288..860C 1994A&A...288..860C)
70- 73 F4.2 --- E_ALi ? Upper error bar for Lithium abundance
75- 78 F4.2 --- e_ALi ? Lower error bar for Lithium abundance
80- 85 F6.3 mag Bmag B-band photometric magnitude
87- 91 F5.3 mag e_Bmag Error bar for B-band photometric magnitude
93 I1 --- r_Bmag Source of B-band photometric magnitude (4)
95-100 F6.3 mag Vmag V-band photometric magnitude
102-106 F5.3 mag e_Vmag Error bar for V-band photometric magnitude
108 I1 --- r_Vmag Source of V-band photometric magnitude (4)
110-115 F6.3 mag Kmag K-band photometric magnitude
117-121 F5.3 mag e_Kmag Error bar for K-band photometric magnitude
123-126 A4 --- SpType Spectral-type, calculate by interpolating
table 5 in Pecaut & Mamajek
(2013ApJS..208....9P 2013ApJS..208....9P, Cat. J/ApJS/208/9)
128-131 I4 K Teff Stellar effective temperature, calculated by
interpolating table 5 in Pecaut & Mamajek
(2013ApJS..208....9P 2013ApJS..208....9P, Cat. J/ApJS/208/9)
133-146 F14.10 deg RAdeg Coordinates of right ascension (J2000)
148-152 F5.3 mas e_RAdeg Error bar for coordinates of right ascension
(measured in milli-arcseconds)
154-167 F14.10 deg DEdeg Coordinates of declination (J2000)
169-174 F6.3 mas e_DEdeg Error bar for coordinates of declination
(measured in milli-arcseconds)
176-180 F5.2 mas PLXL Estimation of photometric parallax derived
from the lower age estimate (5)
182-186 F5.2 mas PLXU ? Estimation of photometric parallax derived
from the upper age estimate
188-191 F4.2 mas e_PLX ? Error bar for the trigonometric parallax
(if available) (6)
193 I1 --- cPLX [1/9] Parallax code (7)
195-202 F8.3 mas/yr pmRA Proper motion in right ascension
204-211 F8.3 mas/yr pmDE Proper motion in declination
213-217 F5.3 mas/yr e_pmRA Error bar for proper motion in right ascension
219-223 F5.3 mas/yr e_pmDE Error bar for proper motion in declination
225 I1 --- cPM [1/3] Proper motion code (8)
227-233 F7.2 km/s Uvel U velocity
235-239 F5.2 km/s e_Uvel ? First error bar on Uvel from the
uncertainties in proper motion and RV (9)
241-244 F4.2 km/s s_Uvel ? Second error bar on Uvel from the
distance uncertainty (9)
246-252 F7.2 km/s Vvel V velocity
254-258 F5.2 km/s e_Vvel ? First error bar on Vvel from the
uncertainties in proper motion and RV (9)
260-263 F4.2 km/s s_Vvel ? Second error bar on Vvel from the
distance uncertainty (9)
265-270 F6.2 km/s Wvel W velocity
272-276 F5.2 km/s e_Wvel ? First error bar on Wvel from the
uncertainties in proper motion and RV (9)
278-281 F4.2 km/s s_Wvel ? Second error bar on Wvel from the
distance uncertainty (9)
283 A1 --- qLC Quality of the light curve (see publication
for details)
285-289 F5.3 d Per Rotation period
291-295 F5.3 d e_Per ? Error bar for rotation period
297-303 I7 --- chisq delta chi-squared value (see publication
for details)
305-306 I2 --- nLC [1/13] Number of seasonal SuperWASP
lightcurves used in determining the
rotation period
308-312 F5.3 1/s Xcts X-ray count rate
314-318 I5 s ExpT Exposure time from ROSAT observation
320-325 F6.3 --- HR1 Hardness ratio 1
327-332 F6.3 [-] log(Lx/Lbol) Base 10 logarithm of the fractional
X-ray to bolometric luminosity
334-352 A19 --- 1SWASP Identification in the SuperWASP catalog
1SWASP (JHHMMSS.ss+DDMMSS.s)
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Note (1): Any ages measured as >1000Myr are lower limits and are at least
older than the Hyades and for the purpose of this work the precision of
these ages are unimportant as they are not considered for further analysis.
Note (2): Positive/negative values represent absorption/emission.
Note (3): Code describing how the Lithium equivalent width is calculated
as follows:
0 = only one measurement which is a 2-sigma upper limit
1 = only one measurement, but not an upper limit
2 = 2 or more measurements, both upper limits, the uncertainty is the
standard deviation
3 = 2 or more measurements, neither upper limits, uncertainty = quadrature
sum of the standard deviation and the average error from each measurement
4 = EWLi<40mÅ and not an upper limit
Note (4): Source of magnitude as follows:
1 = Only data from UCAC4 (Cat. I/322)
2 = Only data from APASS (Cat. II/336)
3 = Data from UCAC4 and APASS, difference is less than 3 error moduli,
and the UCAC4 error bar modulus is less than APASS
4 = Data from UCAC4 and APASS, difference is less than 3 error moduli,
and the APASS error bar modulus is less than UCAC4
5 = Data from UCAC4 and APASS, difference is more than 3 error moduli,
and the UCAC4 error bar modulus is less than APASS
6 = Data from UCAC4 and APASS, difference is more than 3 error moduli,
and the APASS error bar modulus is less than UCAC4
7 = Photometry from Kharchenko et al. (2009yCat.1280....0K 2009yCat.1280....0K, Cat. I/280)
8 = Photometry from Droege et al. (2007yCat.2271....0D 2007yCat.2271....0D, Cat. II/271)
9 = Photometry from NOMAD (error bar assumed to be 0.3)
Note (5): Unless a trigonometric parallax is available, in which case we quote
the trigonometric parallax, leaving the upper parallax column empty,
and quote the error bar in the e_PLX column.
Note (6): Gaia parallax uncertainty have an addition 0.3mas error added to
them, as recommended in the documentation.
Note (7): Parallax code as follows:
1 = only Gaia DR1 available
2 = Gaia and alternative data available, Gaia has lowest error bar,
choose Gaia
3 = Gaia and alternative data available, alternative has lowest error bar,
choose alternative
4 = only available parallax is from van Leeuwen (2007A&A...474..653V 2007A&A...474..653V,
Cat. I/311)
5 = only available parallax is from Kharchenko et al. (2009yCat.1280....0K 2009yCat.1280....0K,
Cat. I/280)
6 = only available parallax is from Finch et al. (2016AJ....151..160F 2016AJ....151..160F,
Cat. J/AJ/151/160)
9 = no trigonometric parallax available
Note (8): Proper motions extracted from the following catalogs:
1 = PPMXL (Cat. I/317)
2 = UCAC4 (Cat. I/322)
3 = GAIA (Cat. I/337)
Note (9): Where there are no trigonometric parallaxes available, we calculate
UVW using the upper and lower photometric parallaxes (based on the assumed age
range of the star). We quote the midpoint of the upper and lower UVW in these
situations. The first error bar (e_Uvel) is the error contribution from
uncertainties in position, proper motion and radial velocity, and also the
trigonometric parallax, if available. The second error bar only exists if
there is no trigonometric parallax available for the target and corresponds
to half the range in the upper and lower UVW. We leave errors blank if they
are >30km/s.
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Byte-by-byte Description of file: rvs.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name of Target (SW) HHMM+DDMM
11- 14 F4.1 d HJD ? Heliocentric Julian Date (HJD-2457500)
16- 22 F7.2 km/s RVi Individual radial velocity measurement
24- 29 F6.2 km/s e_RVi Error bar on RVi
31- 37 F7.2 km/s RVf ? Final radial velocity measurement
39- 44 F6.2 km/s e_RVf ? Error bar on RVf
46 I1 --- Bin [1/4]? Binary score (1)
48 I1 --- r_RV [1/8] Source of radial velocity (2)
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Note (1): Binary score used to distinguish likely single stars (1) from those
very likely to be binaries (5) as follows:
1 = likely single stars (consistent, low-uncertainty RV measurements for 2
or more spectra)
2 = objects which had a single spectrum, an RV uncertainty <5km/s and a
distinct single peak in the CCF
3 = status of the star from the CCF was unclear (presumably as a result of
poor SNR and/or large vsini), resulting in either an indeterminate RV
or a RV uncertainty >5km/s
4 = only one spectrum which results in (a) a clear, multipeaked CCF and
(b) an RV error <5km/s
5 = very likely to be binaries (detected RV differences >5km/s for a target on
separate nights or (if there was only one measurement) if there were
literature sources indicating that either the object is a close binary or
report a RV measurement >5km/s discrepant from our measurement
Note (2): RV references are as follows:
1 = This work
2 = Malo et al. (2014ApJ...788...81M 2014ApJ...788...81M, Cat. J/ApJ/788/81)
3 = Binks et al. (2015MNRAS.452..173B 2015MNRAS.452..173B, Cat. J/MNRAS/452/173)
4 = Nidever et al. (2002ApJS..141..503N 2002ApJS..141..503N, Cat. J/ApJS/141/503)
5 = Elliott et al. (2014A&A...568A..26E 2014A&A...568A..26E, J/A+A/568/A26)
6 = de Bruijne et al. (2012A&A...546A..61D 2012A&A...546A..61D, Cat. J/A+A/546/A61)
7 = Gontcharov et al. (2006A&AT...25..145G 2006A&AT...25..145G)
8 = Malaroda et al. (2006yCat.3249....0M 2006yCat.3249....0M, Cat. III/249)
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Acknowledgements:
Alex Binks, a.s.binks(at)keele.ac.uk
(End) Alex Binks [Univ. Keele], Patricia Vannier [CDS] 28-Dec-2017