J/other/NewA/27.1 RR Lyrae candidates in Aqr halo stream (Munari+, 2014)
APASS BVgri search for and characterization of RR Lyr variables candidate
members of the Aquarius halo stream.
Munari U., Henden A., Frigo A.
<New Astron., 27, 1-12 (2014)>
=2014NewA...27....1M 2014NewA...27....1M
ADC_Keywords: Stars, variable ; Photometry
Keywords: stars: variables: RR Lyr - surveys - Galaxy: structure
Abstract:
The Aquarius stream has been recently discovered in the course of the
RAVE Survey. It is a chemically coherent structure, originating from
the tidal disruption of a 12Gyr, [Fe/H]=-1.0 globular cluster. We
have surveyed a ∼284deg2 area of the sky containing the 15 known
members of the Aquarius stream looking for RR Lyr variables. RR Lyr
variables are primary distance indicators and discovering some of them
firmly associated with the Aquarius stream would provide a 3D
representation of its Galactic orbit and would probe the spatial
structure of the Galactic gravitational potential. During September
and October 2012, we have obtained on-purpose, epoch photometry in
the Landolt BV and Sloan gri bands with the APASS South telescopes
located at Cerro Tololo. Our data are uniformly complete to V=15.2mag
over the whole surveyed area, the faintest recorded stars reaching
V=18mag. We have found 71 RR Lyr variables, and a firm pulsation
period was derived for 53 of them. Our census of RR Lyr variables is
complete to a distance of 8kpc from the Sun. For all objects we
provide distances and light- and color-curves, mean values and
amplitudes in all five BVgri passbands, finding charts and accurate
local photometric sequences. About half of the RR Lyr variables we
have discovered were previously known, but we provide the first
multi-band photometric data. They were in fact mostly discovered as
by-products of white-light patrol searches for optical counterparts to
gamma-ray bursters or potentially hazardous asteroids.
Description:
The large area on the sky covered by the Aquarius stream requires
instruments with a very large field of view. We selected to obtain
multi-band photometry from CTIO (Chile) with the same equipment used
for the APASS all sky photometric survey, separately from the main
Survey program. The observations for this paper were obtained with
fixed exposure times (different and optimized for each photometric
band), set to detect V=17 stars at S/N=5 on a single exposure.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 129 53 List of discovered RR Lyr variables with a
period solution on our data
table2.dat 129 18 List of discovered RR Lyr variables without a
firm period solution on our data
table3.dat 106 45 *List of all remaining RR Lyr variables from
literature that are not included in Table 1 and
Table 2 and are present within the boundaries
of the surveyed field in Fig. 1.
table4.dat 164 709 *Photometric sequences around the discovered
RR Lyr variable stars
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Note on table3.dat: Nearly all of them are much fainter than the completeness
limit of our survey (V=15.2) or its faint limit (V=16.2).
Note on table4.dat: The stars are identified in the finding chart of Fig. 10.
of the paper.
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See also:
J/AJ/148/81 : APASS BVgri photometry of RAVE stars. I. Data (Munari+ 2014)
J/other/JAD/20.4 : 180 APASS variable stars in Aquarius (Munari+, 2014)
Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- APASS APASS name (JDDD.dddd+DD.dddd)
19- 20 I2 h RAh Right ascension (J2000) (1)
22- 23 I2 min RAm Right ascension (J2000) (1)
25- 29 F5.2 s RAs Right ascension (J2000) (1)
31 A1 --- DE- Declination sign (J2000) (1)
32- 33 I2 deg DEd Declination (J2000) (1)
35- 36 I2 arcmin DEm Declination (J2000) (1)
38- 41 F4.1 arcsec DEs Declination (J2000) (1)
43- 44 I2 --- N Number of observing epochs
46- 50 F5.3 mag Vamp [0.4/1.2] Amplitude of variability recorded
in the V band
52- 57 F6.4 d Per [0.25/0.89]? Period
58 A1 --- u_Per [?] Uncertainty flag on Per
59- 61 A3 --- Type RR Lyrae type (ab, or c)
63- 68 F6.3 mag Vmag Mean V magnitude
70- 74 F5.3 mag B-V Mean B-V colour index
76- 81 F6.3 mag V-r' Mean V-r' colour index
83- 87 F5.3 mag g'-r' Mean g'-r' colour index
89- 94 F6.3 mag V-i' ?=9.999 Mean V-i' colour index
96- 99 I4 K Teff [5660/7485] Effective temperature
101-105 F5.2 kpc Dist [1/13] Distance (G1)
107-112 A6 --- Name Literature name
114-117 A4 --- Typel Literature RR Lyrae type
119-127 F9.7 d Perl [0.29/0.75]? Literature period
129 I1 --- r_Typel ? Reference for literature type and period (2)
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Note (1): Epoch 2012.
Note (2): References as follows:
1 = GCVS, Samus et al., Cat. B/gcvs
2 = Kinemuchi et al. (2006, Cat. J/AJ/132/1202)
3 = Miceli et al. (2008, Cat. J/ApJ/678/865)
4 = Hoffman and McNamara (2009, Cat. J/AJ/138/466)
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1 A1 --- Flag [*] Flag (1)
3- 32 A30 --- Name Star name (2)
34- 38 F5.2 mag Vmag V magnitude
40- 44 F5.2 kpc Dist [3/73] Distance (G1)
46- 62 A17 --- APASS APASS name
64- 65 I2 h RAh ? APASS Right ascension (J2000)
67- 68 I2 min RAm ? APASS Right ascension (J2000)
70- 74 F5.2 s RAs ? APASS Right ascension (J2000)
76 A1 --- DE- APASS Declination sign (J2000)
77- 78 I2 deg DEd ? APASS Declination (J2000)
80- 81 I2 arcmin DEm ? APASS Declination (J2000)
83- 86 F4.1 arcsec DEs ? APASS Declination (J2000)
88- 89 I2 --- N [1/14]? Number of our observations
91-106 A16 --- Notes Comments on the object nature based on our data
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Note (1): *: below APASS detection threshold.
Note (2): Name origins:
[KMP2008] = Keller et al. (2008, Cat. J/ApJ/678/851)
[MRS2008] = Miceli et al. (2008, Cat. J/ApJ/678/865)
FASTT = Henden and Stone (1998, Cat. J/AJ/115/296)
[SIG2010] = Sesar et al. (2010, Cat. J/ApJ/708/717)
NSVS = Hoffman and McNamara (2009, Cat. J/AJ/138/466)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- APASS APASS name
19- 20 I2 h RAAh APASS Right ascension (J2000)
22- 23 I2 min RAAm APASS Right ascension (J2000)
25- 28 F4.1 s RAAs APASS Right ascension (J2000)
30 A1 --- DEA- APASS declination sign (J2000)
31- 32 I2 deg DEAd APASS declination (J2000)
34- 35 I2 arcmin DEAm APASS declination (J2000)
37- 40 F4.1 arcsec DEAs APASS declination (J2000)
42 A1 --- St [A-S] Star designation within APASS source field
44- 53 F10.6 deg RAdeg Star right ascension (J2000)
55- 64 F10.6 deg DEdeg Star declination (J2000)
66- 71 F6.3 mag Bmag Star B magnitude
73- 77 F5.3 mag e_Bmag [0.001/0.066] rms uncertainty on Bmag
79- 84 F6.3 mag Vmag Star V magnitude
86- 90 F5.3 mag e_Vmag [0/0.036] rms uncertainty on Vmag
92- 97 F6.3 mag g'mag Star g' magnitude
99-103 F5.3 mag e_g'mag [0.001/0.029] rms uncertainty on g'mag
105-110 F6.3 mag r'mag Star r' magnitude
112-116 F5.3 mag e_r'mag [0.002/0.053] rms uncertainty on r'mag
118-123 F6.3 mag i'mag Star i' magnitude
125-129 F5.3 mag e_i'mag [0.004/0.101]rms uncertainty on i'mag
131-136 F6.3 mag Rcmag Star Rc magnitude
138-143 F6.3 mag Icmag Star Ic magnitude
145-149 F5.3 mag B-V B-V colour index
151-152 I2 --- o_Bmag [4/24] Number of epochs in B band
154-155 I2 --- o_Vmag [4/24] Number of epochs in V band
157-158 I2 --- o_g'mag [4/24] Number of epochs in g' band
160-161 I2 --- o_r'mag [4/24] Number of epochs in r' band
163-164 I2 --- o_i'mag [2/24] Number of epochs in i' band
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Global notes:
Note (G1): Distances are computed according to absolute magnitude calibration by
Bailey (1902AnHar..38....1B 1902AnHar..38....1B), adopting the [Fe/H]=-1.0 metallicity of Aquarius
stream from Wylie-de Boer et al. (2012ApJ...755...35W 2012ApJ...755...35W) and reddenings from
Munari et al. (2013, A&A, submitted) galactic extinction model.
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History:
* 25-Mar-2015: From electronic version of the journal
* 03-Feb-2016: 1 name corrected in table3
(End) Patricia Vannier [CDS] 23-Mar-2015