J/A+A/571/A36 M dwarfs in b201 tile of VVV survey (Rojas-Ayala+, 2014)
M dwarfs in the b201 tile of the VVV survey. Colour-based selection, spectral
types and light curves.
Rojas-Ayala B., Iglesias D., Minniti D., Saito R.K., Surot F.
<Astron. Astrophys. 571, A36 (2014)>
=2014A&A...571A..36R 2014A&A...571A..36R
ADC_Keywords: Milky Way ; Stars, dwarfs ; Stars, M-type ; Photometry
Keywords: surveys - stars: fundamental parameters - stars: low-mass -
Galaxy: bulge
Abstract:
The intrinsically faint M dwarfs are the most numerous stars in the
Galaxy, have main-sequence lifetimes longer than the Hubble time, and
host some of the most interesting planetary systems known to date.
Their identification and classification throughout the Galaxy is
crucial to unraveling the processes involved in the formation of
planets, stars, and the Milky Way. The ESO Public Survey VVV is a deep
near-IR survey mapping the Galactic bulge and southern plane. The VVV
b201 tile, located in the border area of the bulge, was specifically
selected for the characterisation of M dwarfs.
We used VISTA photometry to identify M dwarfs in the VVV b201 tile, to
estimate their subtypes, and to search for transit-like light curves
from the first 26 epochs of the survey.
Description:
UKIDSS photometry from SDSS spectroscopically identified M dwarfs was
used to calculate their expected colours in the YJHKs VISTA system. A
colour-based spectral subtype calibration was computed. Possible
giants were identified by a (J-Ks,HJ) reduced proper motion
diagram. The light curves of 12.8<Ks<15.8 colour-selected M dwarfs
were inspected for signals consistent with transiting objects.
The names, coordinates, VISTA photometry, spectral type, and estimated
distances of the 23,345 colour selected M dwarf candidates in the b201
tile of the VISTA Variables in the Via Lactea (VVV) survey (Minniti et
al. 2010NewA...15..433M 2010NewA...15..433M) are presented. The total proper motion, the
reduced proper motion (HJ) and giant flags are given for the stars
with PPMXL (Roeser et al. 2010AJ....139.2440R 2010AJ....139.2440R, Cat. I/317) and SPM4
(Girard et al. 2011AJ....142...15G 2011AJ....142...15G, Cat. I/320) proper motions, as
well as the 299 colour selected giants. Stars with transit-like curves
are also flagged.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 126 23345 The colour selected M dwarfs in the VVV b201 tile
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See also:
I/317 : The PPMXL Catalog (Roeser+ 2010)
I/320 : SPM 4.0 Catalog (Girard+, 2011)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [VVV]
4- 20 A17 --- VVV VVV designation (JHHMMSSss+DDMMSSs)
22- 33 F12.8 deg RAdeg Right ascension (J2000)
35- 46 F12.8 deg DEdeg Declination (J2000)
48- 53 F6.3 mag Zmag Z VISTA magnitude
55- 60 F6.3 mag Ymag Y VISTA magnitude
62- 67 F6.3 mag Jmag J VISTA magnitude
69- 74 F6.3 mag Hmag H VISTA magnitude
76- 81 F6.3 mag Ksmag Ks VISTA magnitude
83- 84 I2 --- SpT [0/9] Photometric M-subtype from Eq.1
86- 89 I4 pc Dist [27/3812] Estimated photometric distance
91- 97 F7.3 mas/yr pmS ?=- Total proper motion from SPM4 (I/320)
99-105 F7.3 mag HJS ?=- J reduced proper motion magnitude from
total proper motion in SPM4 (I/320) (2)
107-113 F7.3 mas/yr pmP ?=- Total proper motion from PPMXL (I/317)
115-121 F7.3 mag HJP ?=- J reduced proper motion magnitude from
total proper motion in PPMXL (I/317) (2)
123-126 A4 --- n_VVV Remarks on star (1)
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Note (1): Flag as follows:
G1 = Giant by total proper motion from SPM4 (I/320)
G2 = Giant by total proper motion from PPMXL (I/317)
G3 = Giant by colour cuts
G12 = Giant by total proper motion from SPM4 (I/320) and PPMXL (I/317)
G13 = Giant by total proper motion from SPM4 (I/320) and colour cuts
G23 = Giant by total proper motion from PPMXL (I/317) and colour cuts
G123 = Giant by total proper motion from SPM4 (I/320) and PPMXL (I/317)
and colour cuts
T = Transit-like light curve
Note (2): the reduced proper motion magnitude is a combination of the
magnitude and the total proper motion (expressed in arcsec/yr) as:
HJ = J + 5logµ
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Acknowledgements:
Barbara Rojas-Ayala, barbara.rojas(at)gmail.com
(End) B. Rojas-Ayala [IA-CAUP, Portugal], P. Vannier [CDS] 04-Nov-2014