J/PASP/132/K4202 Evryscope-South survey (Galliher+, 2020)
Evryscope-South survey of upper- and pre-main sequence solar neighborhood stars.
Galliher N.W., Ratzloff J.K., Corbett H., Law N.M., Howard W.S.,
Glazier A.L., Vasquez Soto A., Gonzalez R.
<Publ. Astron. Soc. Pac., 132, k4202-4202 (2020)>
=2020PASP..132k4202G 2020PASP..132k4202G (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Stars, nearby ; Stars, variable ; Stars, distances
Abstract:
Using photometric data collected by Evryscope-South, we search for
nearby young variable systems on the upper main sequence (UMS) and
pre-main sequence (PMS). The Evryscopes are all-sky high-cadence
telescope arrays operating in the Northern and Southern hemispheres.
We base our search on a Gaia-selected catalog of young neighborhood
upper- and pre-main sequence stars which were chosen through both
astrometric and photometric criteria. We analyze 44971
Evryscope-South light curves in search of variability. We recover 615
variables, with 378 previously known, and 237 new discoveries
including 84 young eclipsing binaries (EB) candidates. We discover a
new highly eccentric binary system and recover a further four
previously known systems, with periods ranging from 299 to 674hr. We
find 158 long-period (>50hr) candidate EB systems, 9 from the PMS and
149 from the UMS, which will allow constraints on the mass/radius/age
relation. These long-period EBs include a 179.3hr PMS system and a
867.8hr system from the UMS. For PMS variable candidates we estimate
system ages, which range from 1 to 23Myr for non-EBs and from 2 to
17Myr for EBs. Other non-EB discoveries that show intrinsic
variability will allow relationships between stellar rotation rates,
ages, activity, and mass to be characterized.
Description:
All EB system and variable star discoveries presented in this survey
are the results of Evryscope-South photometric observations taken from
2016 January to 2018 June.
The Zari et al. (2018A&A...620A.172Z 2018A&A...620A.172Z. Cat. J/A+A/620/A172) catalogs of
UMS and PMS stars closer than 500 pc provides the foundation for this
survey.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 109 467 UMS variable system recoveries from this survey
tablea2.dat 112 148 PMS variable system recoveries from this survey
refs.dat 73 92 References
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See also:
J/A+A/620/A172 : Solar neighbourhood young stars 3D mapping (Zari+, 2018)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 20 A20 --- Name EVRJ name (EVRJDDD.dddd+DD.ddd)
21 A1 --- n_Name [*] Note (G1)
23- 25 A3 --- Type Type (G2)
27- 35 F9.5 h Per Period
38- 44 F7.5 h e_Per rms uncertainty on Period
46- 50 F5.3 mag Amp Fitted amplitude for sinusoid for non-EB
52- 56 F5.3 mag e_Amp rms uncertainty on fitted amplitude
for sinusoid
58- 62 F5.3 mag SecAmp ?=- Fitted amplitude for inverted Gaussian
for EBs
64- 68 F5.3 mag e_SecAmp ?=- rms uncertainty on fitted amplitude
for inverted Gaussian
70- 72 F3.1 Msun Mass Mass
74- 76 I3 pc Dist Distance
78- 80 I3 pc e_Dist rms uncertainty on distance
82- 85 F4.2 --- PrimDur ?=- Primary eclipse duration (in phase unit)
87- 90 F4.2 --- SecDur ?=- Secondary eclipse duration (in phase unit)
92-104 E13.8 d t0 ?=- zeroth epoch for the primary eclipse (MJD)
106-109 A4 --- Ref References, in refs.dat file
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 20 A20 --- Name EVRJ name (EVRJDDD.dddd+DD.ddd)
21 A1 --- n_Name [*] Note (G1)
23- 25 A3 --- Type Type (G2)
27- 35 F9.5 h Per Period
37- 43 F7.5 h e_Per rms uncertainty on Period
45- 49 F5.3 mag Amp Fitted amplitude for sinusoid for non-EB
51- 55 F5.3 mag e_Amp rms uncertainty on fitted amplitude
for sinusoid
57- 61 F5.3 mag SecAmp ?=- Fitted amplitude for inverted Gaussian
for EBs
63- 67 F5.3 mag e_SecAmp ?=- rms uncertainty on fitted amplitude
for inverted Gaussian
69- 72 F4.2 Msun Mass Mass
74- 76 F3.1 [yr] logAge Age
78- 80 I3 pc Dist Distance
82- 83 I2 pc e_Dist rms uncertainty on distance
85- 88 F4.2 --- PrimDur ?=- Primary eclipse duration (in phase unit)
90- 93 F4.2 --- SecDur ?=- Secondary eclipse duration (in phase unit)
95-107 E13.8 d t0 ?=- zeroth epoch for the primary eclipse (MJD)
109-112 A4 --- Ref References, in refs.dat file
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Ref Reference code
7- 25 A19 --- BibCode BibCode
27- 50 A24 --- Aut Author's name
52- 73 A22 --- Com Comments
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Global notes:
Note (G1): Note as follows:
* = possible contamination between the target star and other stars
contained in the same Evryscope pixel
Note (G2): Type as follows:
EB = one eclipse
EB2 = two eclipses
S = a sinusoidally varying star
NS = a periodic non-sinusoidally varying system
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Feb-2021