J/MNRAS/446/2251 Southern Catalina Survey type-ab RR Lyrae (Torrealba+, 2015)
Discovery of ∼9,000 new RR Lyrae in the southern Catalina surveys.
Torrealba G., Catelan M., Drake A.J., Djorgovski S.G., McNaught R.H.,
Belokurov V., Koposov S., Graham M.J., Mahabal A., Larson S.,
Christensen E.
<Mon. Not. R. Astron. Soc. 446, 2251 (2015)>
=2015MNRAS.446.2251T 2015MNRAS.446.2251T
ADC_Keywords: Surveys ; Stars, variable
Keywords: methods: data analysis - methods: statistical -
stars: variables: RR Lyrae - Galaxy: halo - Galaxy: structure
Abstract:
We present the results of a deep, wide-area variability survey in the
Southern hemisphere. As part of the Catalina Sky Surveys, the Siding
Spring Survey (SSS) has covered 14,800 square degrees in the
declination range of -75°<delta←15° To mine the enormous
SSS dataset efficiently we have developed two algorithms: Automatic
Period Selection (APS) and Automatic Fourier Decomposition (AFD),
which aim to sharpen the period estimation and produce robust
lightcurve models. Armed with the APS and AFD outputs we classify
10540 ab-type RR Lyrae (RRab) stars (∼90% of which are new) across
the Southern sky.
Description:
The RR Lyrae presented are found using the Siding Spring Survey (SSS),
which is the southern part of the Catalina Sky Surveys. The SSS uses
the Uppsala 0.5-m Schmidt telescope equipped with 4k*4k CCD camera,
with a field of view of 4 square degrees. In the SSS observations the
Galactic plane region (|b|<15°) is avoided due to crowding. Images
are unfiltered to maximize throughput, and taken in sequences of four
observations separated by ten minutes with exposures that last
approximately 30 seconds.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 121 10540 Type-ab RR Lyrae selected from the Siding Spring
Survey (SSS)
table3.dat 83 27 Overdensity candidates in the Galactic halo
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See also:
J/A+A/463/589 : RR Lyrae in southern globular cluster NGC 362 (Szekely+, 2007)
J/ApJ/763/32 : Galactic halo type-ab RR Lyraes from CSS (Drake+, 2013)
J/ApJS/213/9 : Catalina Surveys periodic variable stars (Drake+, 2014)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [SSS_]
5- 20 A16 --- SSS SSS designation (JHHMMSS.s+DDMMSS)
22- 30 F9.5 deg RAdeg Right ascension (J2000)
32- 40 F9.5 deg DEdeg Declination (J2000)
42- 46 F5.2 mag Vmag Average V-band magnitude
48- 54 F7.5 d Per [0.4/1.0] Period
56- 59 F4.2 mag Amp [0.11/1.59] Amplitude of the lightcurve
61- 63 I3 --- Nobs [59/280] Number of photometric observations
65- 69 F5.2 kpc dH [0.9/51] Distance to the Sun
71- 75 F5.2 [Sun] [Fe/H] [-3/0.4] Photometric Metallicity (1)
77- 82 F6.4 --- E(B-V) [0/1.9] Reddening from Schlegel et al.
(1998ApJ...500..525S 1998ApJ...500..525S) maps
84- 88 F5.1 --- Dm [1/215] Metallicity reliability parameter (2)
90- 95 F6.4 rad phi31 [0/6.283] φ31 lightcurve parameter
(φ31=φ3-3φ1)
97-121 A25 --- OName Name if previously known
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Note (1): the photometric metallicity is given by Jurcsik & Kovacs 1996
(J/A+A/312/111): [Fe/H] = -5.038-5.394logP+1.345φ31.
Note (2): the reliability parameter is defined by Jurcsik & Kovacs 1996
(J/A+A/312/111): Dm=max(|Fobs-Fcalc|/σF), maximum of
the deviations of the Fourier parameters relative to their errors.
If Dm<3, the light curve satisfies the compatibility condition.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- ID Reference designation
7- 12 A6 --- --- [SSSOc_]
13- 26 A14 --- SSSOC Overdensity designation (JHHMMSS+DDMMSS)
28- 32 F5.2 --- Signi [2.1/16] Significance in standard deviations
(σ unit)
34- 39 F6.2 deg RAdeg Mean right ascension of stars of the
overdensity (J2000)
41- 46 F6.2 deg DEdeg Mean declination of stars of the
overdensity (J2000)
48- 50 I3 --- nRRL [7/327] Number of stars associated with the
overdensity
52- 56 F5.2 mag Vmag Mean magnitude of the stars of the overdensity
58- 62 F5.2 mag b_Vmag Minimum V magnitude of the stars of the
overdensity
64- 68 F5.2 mag B_Vmag Maximum V magnitude of the stars of the
overdensity
70- 73 F4.1 kpc dD [0.4/13] Overdensity's extension along the line
of sight, δD
75- 78 F4.1 deg dRA [2.9/70.9] Extension in RA, δRAcosDE
80- 83 F4.1 deg dDE [3.7/34.1] Extension in Declination, δDE
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Acknowledgements:
Gabriel Torrealba, git21(at)ast.cam.ac.uk
History:
* 26-Nov-2014: on-line version
* 22-Jun-2015: table 3 added (from electronic version of the paper)
(End) Gabriel Torrealba [Cambridge Univ.], Patricia Vannier [CDS] 31-Oct-2014