J/MNRAS/425/1459 RR Lyrae in M32 (Sarajedini+, 2012)
An ancient metal-poor population in M32, and halo satellite accretion in M31,
identified by RR Lyrae stars.
Sarajedini A., Yang S.-C., Monachesi A., Lauer T.R., Trager S.C.
<Mon. Not. R. Astron. Soc., 425, 1459-1472 (2012)>
=2012MNRAS.425.1459S 2012MNRAS.425.1459S
ADC_Keywords: Galaxies, nearby ; Stars, variable ; Photometry, VRI
Keywords: stars: abundances -
stars: Hertzsprung-Russell and colour-magnitude diagrams -
stars: variables: RR Lyrae - galaxies: evolution -
galaxies: individual: M31, M32
Abstract:
We present time series photometry of two fields near M32 using
archival observations from the Advanced Camera for Surveys Wide Field
Channel on-board the Hubble Space Telescope. One field is centred
about 2arcmin from M32, while the other is located 15arcmin to the
south-east of M31. The imaging covers a time baseline sufficient for
the identification and characterization of a total number of 1139
RR Lyrae variables of which 821 are ab-type and 318 are c-type.
Description:
The observations used in the present study were obtained with
HST/ACS/WFC as part of programme GO-9392 (PI: Mateo). The details of
this programme have already been fully described by Rudenko, Worthey &
Mateo (2009AJ....138.1985R 2009AJ....138.1985R). In summary, two fields were observed; the
first one, which we designate 'M32', was centred south-east of M32
covering a radial distance range of 1-4.5arcmin from the centre
of M32.
The second field was meant to be a control field (designated
'Control') located roughly 5arcmin north-east of M32 in order to
monitor the M31 background field in the vicinity of M32.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 77 155 ab-type RR Lyrae stars in M32 WFC1 field
table3.dat 77 52 c-type RR Lyrae stars in M32 WFC1 field
table4.dat 77 220 ab-type RR Lyrae stars in M32 WFC2 field
table5.dat 77 82 c-type RR Lyrae stars in M32 WFC2 field
table6.dat 77 204 ab-type RR Lyrae stars in Control WFC1 field
table7.dat 77 71 c-type RR Lyrae stars in Control WFC1 field
table8.dat 77 242 ab-type RR Lyrae stars in Control WFC2 field
table9.dat 77 113 c-type RR Lyrae stars in Control WFC2 field
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See also:
J/AJ/104/1349 : Infrared-luminous giants in M32 (Freedman, 1992)
J/ApJ/504/113 : F175W and F275W photometry of M31 and M32 (Brown+, 1998)
J/ApJ/532/308 : Hot Horizontal Branch Stars in the Core of M32 (Brown+ 2000)
J/ApJ/725/670 : Kinematics in the M32 nucleus (Seth, 2010)
J/A+A/539/A138 : RR Lyrae variable stars in M32 (Fiorentino+, 2012)
J/ApJ/708/817 : RR Lyrae variables in M32 and M31 (Fiorentino+, 2010)
Byte-by-byte Description of file: table?.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- ID Sequential number
8 I1 h RAh Right ascension (J2000)
10- 11 I2 min RAm Right ascension (J2000)
13- 17 F5.2 s RAs Right ascension (J2000)
19 A1 --- DE- Declination sign (J2000)
20- 21 I2 deg DEd Declination (J2000)
23- 24 I2 arcmin DEm Declination (J2000)
26- 30 F5.2 arcsec DEs Declination (J2000)
32- 37 F6.3 mag <Vmag> Average V (HST/ACS F606W) magnitude
39- 44 F6.3 mag <Imag> Average I (HST/ACS F814W) magnitude
46- 50 F5.3 mag (V-I)m Minimum light (V-I) colour index
52- 56 F5.3 mag <V-I> Average V-I colour index
58- 63 F6.4 d Per Period
65- 70 F6.4 mag Vamp V band amplitude
72- 77 F6.4 mag Iamp I band amplitude
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 01-Aug-2013