J/MNRAS/424/2528 RR Lyrae in SDSS Stripe 82 (Suveges+, 2012)
Search for high-amplitude δ Scuti and RR Lyrae stars in Sloan Digital Sky
Survey Stripe 82 using principal component analysis.
Suveges M., Sesar B., Varadi M., Mowlavi N., Becker A.C., Ivezic Z.,
Beck M., Nienartowicz K., Rimoldini L., Dubath P., Bartholdi P., Eyer L.
<Mon. Not. R. Astron. Soc., 424, 2528-2550 (2012)>
=2012MNRAS.424.2528S 2012MNRAS.424.2528S
ADC_Keywords: Surveys ; Stars, variable ; Photometry, SDSS
Keywords: methods: data analysis - methods: statistical - surveys -
stars: variables: delta Scuti - stars: variables: RR Lyrae
Abstract:
We propose a robust principal component analysis framework for the
exploitation of multiband photometric measurements in large surveys.
Period search results are improved using the time-series of the first
principal component due to its optimized signal-to-noise ratio. The
presence of correlated excess variations in the multivariate
time-series enables the detection of weaker variability. Furthermore,
the direction of the largest variance differs for certain types of
variable stars. This can be used as an efficient attribute for
classification. The application of the method to a subsample of Sloan
Digital Sky Survey Stripe 82 data yielded 132 high-amplitude delta
Scuti variables. We also found 129 new RR Lyrae variables,
complementary to the catalogue of Sesar et al., extending the halo
area mapped by Stripe 82 RR Lyrae stars towards the Galactic bulge.
The sample also comprises 25 multiperiodic or Blazhko RR Lyrae stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 98 105 RR Lyrae candidates in Stripe 82
table2.dat 264 104 Best-fitting templates of Sesar et al. (2010,
Cat. J/ApJ/708/717) for the new RR Lyrae
candidates in Stripe 82 (except No. 4526140)
table3.dat 121 14 Double-mode RR Lyrae candidates in Stripe 82
table4.dat 121 8 RR Lyrae candidates with closely spaced multiple
frequencies or indicating period, phase or
amplitude shifts in Stripe 82
table5.dat 121 3 Multiperiodic RR Lyrae candidates with unusual
period ratios in Stripe 82
table7.dat 121 22 Multiperiodic high-amplitude δ Scuti stars
(HADS) in Stripe 82
table6.dat 98 110 High-amplitude δ Scuti (HADS) candidates
in Stripe 82
fig/* . 261 Figures which summarize the most important features
that can be derived from photometric time series
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See also:
J/ApJ/708/717 : Light curve templates of RR Lyrae stars (Sesar+, 2010)
J/ApJ/731/17 : Variability of low-mass stars in SDSS Stripe 82 (Becker+ 2011)
J/ApJS/186/233 : Variable point sources in SDSS stripe 82. (Bhatti+, 2010)
J/MNRAS/424/2528 : RR Lyrae in SDSS Stripe 82 (Suveges+, 2012)
Byte-by-byte Description of file: table[16].dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- ID Identification number
8 A1 --- n_ID [*] Multiple peaks (1)
10- 19 F10.6 deg RAdeg [-90/90] Right ascension (J2000)
21- 29 F9.6 deg DEdeg [-1.3/1.3] Declination (J2000)
31- 34 A4 --- Type RR Lyrae type (table1) or DSCT (table6)
36- 40 F5.2 mag umag Mean u magnitude corrected for the interstellar
medium extinction
42- 46 F5.2 mag gmag Mean g magnitude corrected for the interstellar
medium extinction
48- 52 F5.2 mag rmag Mean r magnitude corrected for the interstellar
medium extinction
54- 58 F5.2 mag imag Mean i magnitude corrected for the interstellar
medium extinction
60- 64 F5.2 mag zmag Mean z magnitude corrected for the interstellar
medium extinction
66- 73 F8.5 d-1 Fz1 Pulsation frequency determined from generalized
least-squares period search on PC1 (first direction
of the principal component analysis)
75- 78 F4.2 mag uAmp Amplitude in u-band
80- 83 F4.2 mag gAmp Amplitude in g-band
85- 88 F4.2 mag rAmp Amplitude in r-band
90- 93 F4.2 mag iAmp Amplitude in i-band
95- 98 F4.2 mag zAmp Amplitude in z-band
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Note (1): *: stars with weak periodogram peaks or the presence of other
peaks with almost equivalent height.
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 I7 --- ID Identification number
9- 18 F10.6 deg RAdeg [-90/360] Right ascension (J2000)
20- 28 F9.6 deg DEdeg [-1.3/1.3] Declination (J2000)
30- 35 F6.3 kpc Dist ?=- Heliocentric distance for stars
included in Fig. 9
37- 42 F6.3 mag <Vmag> ?=- Mean dereddened V-band magnitude for stars
included in Fig. 9 (1)
44- 51 F8.6 d Per Period
53- 57 F5.3 mag uAmp Amplitude in band u determined from the
best-fit template
58 A1 --- n_uAmp [*] '*' indicates underestimated uAmp
60- 75 F16.10 d uMJD0 Epoch of maximum brightness in u band
determined from the best-fit template
77- 82 F6.3 mag umag0 u magnitude at the epoch of maximum brightness
corrected for the ISM extinction
84- 86 I3 --- uTemp u magnitude best-fit template identifier
number (3)
88- 93 F6.2 --- uZeta u magnitude goodness-of-fit statistics (4)
95- 99 F5.3 mag gAmp Amplitude in band g determined from the
best-fit template
100 A1 --- n_gAmp [*] '*' indicates underestimated gAmp
102-117 F16.10 d gMJD0 Epoch of maximum brightness in g band
determined from the best-fit template
119-124 F6.3 mag gmag0 g magnitude at the epoch of maximum brightness
corrected for the ISM extinction
126-128 I3 --- gTemp g magnitude best-fit template identifier
number (3)
130-136 F7.2 --- gZeta g magnitude goodness-of-fit statistics (4)
138-142 F5.3 mag rAmp Amplitude in band r determined from the
best-fit template
143 A1 --- n_rAmp [*] '*' indicates underestimated rAmp
145-160 F16.10 d rMJD0 Epoch of maximum brightness in r band
determined from the best-fit template
162-167 F6.3 mag rmag0 r magnitude at the epoch of maximum brightness
corrected for the ISM extinction
169-171 I3 --- rTemp r magnitude best-fit template identifier
number (3)
173-179 F7.2 --- rZeta r magnitude goodness-of-fit statistics (4)
181-185 F5.3 mag iAmp Amplitude in band i determined from the
best-fit template
186 A1 --- n_iAmp [*] '*' indicates underestimated iAmp
188-203 F16.10 d iMJD0 Epoch of maximum brightness in i band
determined from the best-fit template
205-210 F6.3 mag imag0 i magnitude at the epoch of maximum brightness
corrected for the ISM extinction
212-214 I3 --- iTemp i magnitude best-fit template identifier
number (3)
216-222 F7.2 --- iZeta i magnitude goodness-of-fit statistics (4)
224-228 F5.3 mag zAmp Amplitude in band z determined from the
best-fit template
229 A1 --- n_zAmp [*] '*' indicates underestimated zAmp
231-246 F16.10 d zMJD0 Epoch of maximum brightness in z band
determined from the best-fit template
248-253 F6.3 mag zmag0 z magnitude at the epoch of maximum brightness
corrected for the ISM extinction
255-257 I3 --- zTemp z magnitude best-fit template identifier
number (3)
259-264 F6.2 --- zZeta z magnitude goodness-of-fit statistics (4)
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Note (1): determined from a best-fit V-band template synthetized from the
best-fitting g and r templates.
Note (3): as given in Sesar et al. (2010, Cat. J/ApJ/708/717)
Note (4): goodness-of-fit statistic of Sesar et al., 2010ApJ...708..717S 2010ApJ...708..717S,
Eq. 5: ζ=median{|mi-mt|/σi}
where mi and σi are the observed values and errors,
and mt the template values.
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Byte-by-byte Description of file: table3.dat table4.dat table5.dat table7.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 I7 --- ID Identification number
10- 19 F10.6 deg RAdeg [-90/90] Right ascension (J2000)
21- 29 F9.6 deg DEdeg [-1.3/1.3] Declination (J2000)
31- 34 A4 --- Type Variable type (1)
36- 40 F5.2 mag umag Mean u magnitude corrected for the interstellar
medium extinction
42- 46 F5.2 mag gmag Mean g magnitude corrected for the interstellar
medium extinction
48- 52 F5.2 mag rmag Mean r magnitude corrected for the interstellar
medium extinction
54- 58 F5.2 mag imag Mean i magnitude corrected for the interstellar
medium extinction
60- 64 F5.2 mag zmag Mean z magnitude corrected for the interstellar
medium extinction
66- 73 F8.5 d-1 Fz1 Pulsation frequency determined from generalized
least-squares period search on PC1 (first
direction of the principal component analysis)
75- 82 F8.5 d-1 Fr ? Secondary frequency
84- 90 F7.5 --- Ratio [0.6/1]? Ratio of fundamental to first-overtone
frequency Fz1/Fr
92- 96 F5.3 --- Pr [0/1] P-value of secondary frequency
98-101 F4.2 mag uAmp Amplitude in u-band
103-106 F4.2 mag gAmp Amplitude in g-band
108-111 F4.2 mag rAmp Amplitude in r-band
113-116 F4.2 mag iAmp Amplitude in i-band
118-121 F4.2 mag zAmp Amplitude in z-band
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Note (1): Varialbe types as follows:
RRdm = double-mode RR Lyrae candidate (table3)
RRmf = RR Lyrae candidates with closely spaced multiple frequencies or
indicating period, phase or amplitude shifts (table4)
RRu = Multiperiodic RR Lyrae candidates with unusual period ratios (table5)
mult = Multiperiodic HADS stars (table7)
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History:
* 10-May-2013: From electronic version of the journal
* 21-Sep-2013: corrected table1, which contained the star ID=5608516
for 2 positions: ID fixed to 5631079 to match table2.dat.
* 17-Jan-2014: tables 3,4,5 and 7 added
(End) Patricia Vannier [CDS] 10-May-2013