J/A+A/375/909 RR Lyrae stars in the Sgr dwarf (Cseresnjes 2001)
RR Lyrae stars in the Sagittarius dwarf galaxy: Period analysis
Cseresnjes P.
<Astron. Astrophys. 375, 909 (2001)>
=2001A&A...375..909C 2001A&A...375..909C
ADC_Keywords: Stars, variable ; Magnitudes
Keywords: stars: horizontal-branch - stars: population II -
stars: variables: RR Lyr - galaxies: dwarf -
galaxies: individual: Sagittarius dwarf - Local group
Description:
We carried out a period analysis on ∼3700 RR Lyrae stars on two
Schmidt fields centred on (l, b)=(3.1°, -77.1°) and (6.6°,
-10.8°) respectively, covering an area of ∼50°2. These stars
are distributed almost evenly between the Sagittarius dwarf galaxy
(Sgr) and the Milky Way.
Files in the "lcurves" directory are the light curves of the
multi-periodic RR Lyraes discovered towards the Sgr dwarf galaxy. This
set includes stars in Sgr and also foreground Galactic RR Lyraes.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 81 40 Double mode RR Lyrae in Sgr
table2.dat 81 13 Galactic RRd stars
table3.dat 76 5 RR Lyrae stars in Sgr with two closely spaced
frequencies
table4.dat 76 8 Galactic RR Lyraes with two closely spaced
frequencies
lcurves/* . 66 Light curves (table 5)
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See also:
J/A+A/357/871 : RR Lyrae stars in the Sgr dwarf (Paper I) (Cseresnjes+, 2000)
Byte-by-byte Description of file: table[12].dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name RR Lyrae designation
10- 11 I2 h RAh Right ascension (J2000)
13- 14 I2 min RAm Right ascension (J2000)
16- 20 F5.2 s RAs Right ascension (J2000)
22 A1 --- DE- Declination sign (J2000)
23- 24 I2 deg DEd Declination (J2000)
26- 27 I2 arcmin DEm Declination (J2000)
29- 32 F4.1 arcsec DEs Declination (J2000)
34- 37 F4.1 mag Bjmag ? Johnson B magnitude (DUO field)
39- 42 F4.1 mag B4415 ? B4415 magnitude (SAG field) (1)
44- 47 F4.2 --- A0 Amplitude of the fundamental mode pulsation (2)
49- 52 F4.2 --- A1/A0 Amplitude ratio
54- 60 F7.5 d P0 Period of the fundamental mode pulsation
62- 67 F6.4 --- P1/P0 Period ratio
69- 72 F4.2 --- Prob Probability that the Ξratio occured by
chance if it were following a Fisher-Snedecor
distribution
74- 81 A8 --- Meth Method 1 (yes/no) (3)
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Note (1): B4415 magnitude: 68 Kodak Tech-Pan 4415 films combined with
a BG12 filter
Note (2): Amplitudes are given in Bjmag for DUO and B4415 for SAG.
Note (3): the abbreviations are:
A0: fundamental period aliased
A1: first overtone period aliased
N: periodogram too noisy - i.e. Sj<8 (see Chap. 3)
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Byte-by-byte Description of file: table[34].dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name RR Lyrae designation
10- 11 I2 h RAh Right ascension (J2000)
13- 14 I2 min RAm Right ascension (J2000)
16- 20 F5.2 s RAs Right ascension (J2000)
22 A1 --- DE- Declination sign (J2000)
23- 24 I2 deg DEd Declination (J2000)
26- 27 I2 arcmin DEm Declination (J2000)
29- 32 F4.1 arcsec DEs Declination (J2000)
34- 37 F4.1 mag Bjmag ? Johnson B magnitude
39- 42 F4.1 mag B4415 ? B4415 magnitude (1)
44- 47 F4.2 --- Ap Primary pulsation amplitude
49- 52 F4.2 --- As/Ap Amplitude ratio
54- 60 F7.5 d Pp Primary pulsation period
62- 67 F6.4 --- Ps/Pp Period ratio
69- 72 F4.2 --- Prob Probability that the Ξratio occured by
chance if it were following a Fisher-Snedecor
distribution
74- 76 A3 --- Type RR Lyrae type
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Note (1): B4415 magnitude: 68 Kodak Tech-Pan 4415 films combined with a
BG12 filter
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Byte-by-byte Description of file: lcurves/*
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Bytes Format Units Label Explanations
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1- 13 F13.5 d JD Julian date
15- 19 F5.2 mag mag Johnson B or B4415 magnitude (1)
21- 24 F4.2 mag e_mag error on magnitude
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Note (1): Magnitudes are given in Bj for light curves with prefix "vd",
and in B4415 for light curves with prefix "vs".
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Acknowledgements: Patrick CSERESNJES
References:
Cseresnjes et al., Paper I 2000A&A...357..871C 2000A&A...357..871C, Cat. J/A+A/357/871
(End) Patricia Bauer [CDS] 20-Aug-2001