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J/AJ/110/704                 RR Lyrae Variables in M15        (Silbermann+ 1995)

The RR Lyrae Variable Stars in the Globular Cluster M15 Silbermann N.A., Smith Horace A. <Astron. J. 110, 704 (1995)> =1995AJ....110..704S
ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry, CCD Abstract: New CCD photometry is presented for RR Lyrae variable stars in the globular cluster M15. This photometry, mainly in V and R, with some additional B and I, is used to construct lightcurves of 44 RR Lyraes and one Cepheid in M15. One new low-amplitude RR Lyrae star was discovered. The observable parameters of the light curves are used, in conjunction with theoretical photometric indices, to obtain effective temperatures and bolometric magnitudes in the RR Lyrae stars. We confirm that the regions occupied by RRab and RRcd variables in M15 have little or no overlap in effective temperature. Photometry for variable and nonvariable horizontal branch stars in M15 is used to establish the high and low temperature boundaries of the instability strip. There is evidence that the blue edge of the M15 RR Lyrae instability strip becomes cooler at higher luminosities. Employing Cox's value of the mass of RRd stars, 0.75 Msun, and the pulsation equation, the absolute magnitude of the RR Lyrae stars in M15 is estimated to be <MV> = +0.36±0.12 mag. However, this result depends upon the adopted mass, bolometric correction, and color-temperature relation, which remain significantly uncertain. The implications of the absolute magnitude determination for the ages of the globular clusters are discussed. Objects: --------------------------------------------------- RA (2000) DE Designation(s) --------------------------------------------------- 21 29 58.2 +12 10 02 M 15 = NGC 7078 = C 2127+119 --------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2 330 162 MSU V photometry of M15 variables table3 330 129 MSU R photometry of M15 variables table4a 140 15 WIRO south field B photometry of M15 variables table4b 140 16 WIRO south field V photometry of M15 variables table4c 140 16 WIRO south field R photometry of M15 variables table4d 140 16 WIRO south field I photometry of M15 variables table5a 70 14 WIRO NW field B photometry of M15 variables table5b 70 14 WIRO NW field V photometry of M15 variables table5c 70 14 WIRO NW field R photometry of M15 variables table5d 70 14 WIRO NW field I photometry of M15 variables table6 80 46 Photometric parameters of M15 variables
See also: J/AJ/106/154 : HST Observations in inner region of M15 (Ferraro+ 1993) J/AJ/107/1745 : HST UVI photometry of M15. II. (Yanny+, 1994) J/AJ/107/2067 : Fabry-Perot measurements of M15 (Gebhardt+, 1994) J/ApJ/347/251 : Dynamics of Globular Cluster M15 (Peterson+ 1989) Byte-by-byte Description of file: table2 table3
Bytes Format Units Label Explanations
1- 5 I5 --- Frame 7- 14 F8.3 d HJD-2448000 Heliocentric Date of Observation - 2448000 17- 21 F5.2 mag V1 []?=99.99 MSU photometry for star V1 22 A1 --- u_V1 Uncertainty flag on V1 24- 28 F5.2 mag V2 []?=99.99 MSU photometry for star V2 29 A1 --- u_V2 Uncertainty flag on V2 31- 35 F5.2 mag V3 []?=99.99 MSU photometry for star V3 36 A1 --- u_V3 Uncertainty flag on V3 38- 42 F5.2 mag V4 []?=99.99 MSU photometry for star V4 43 A1 --- u_V4 Uncertainty flag on V4 45- 49 F5.2 mag V5 []?=99.99 MSU photometry for star V5 50 A1 --- u_V5 Uncertainty flag on V5 52- 56 F5.2 mag V6 []?=99.99 MSU photometry for star V6 57 A1 --- u_V6 Uncertainty flag on V6 59- 63 F5.2 mag V7 []?=99.99 MSU photometry for star V7 64 A1 --- u_V7 Uncertainty flag on V7 66- 70 F5.2 mag V8 []?=99.99 MSU photometry for star V8 71 A1 --- u_V8 Uncertainty flag on V8 73- 77 F5.2 mag V9 []?=99.99 MSU photometry for star V9 78 A1 --- u_V9 Uncertainty flag on V9 80- 84 F5.2 mag V10 []?=99.99 MSU photometry for star V10 85 A1 --- u_V10 Uncertainty flag on V10 87- 91 F5.2 mag V11 []?=99.99 MSU photometry for star V11 92 A1 --- u_V11 Uncertainty flag on V11 94- 98 F5.2 mag V13 []?=99.99 MSU photometry for star V13 99 A1 --- u_V13 Uncertainty flag on V13 101-105 F5.2 mag V14 []?=99.99 MSU photometry for star V14 106 A1 --- u_V14 Uncertainty flag on V14 108-112 F5.2 mag V15 []?=99.99 MSU photometry for star V15 113 A1 --- u_V15 Uncertainty flag on V15 115-119 F5.2 mag V17 []?=99.99 MSU photometry for star V17 120 A1 --- u_V17 Uncertainty flag on V17 122-126 F5.2 mag V18 []?=99.99 MSU photometry for star V18 127 A1 --- u_V18 Uncertainty flag on V18 129-133 F5.2 mag V19 []?=99.99 MSU photometry for star V19 134 A1 --- u_V19 Uncertainty flag on V19 136-140 F5.2 mag V20 []?=99.99 MSU photometry for star V20 141 A1 --- u_V20 Uncertainty flag on V20 143-147 F5.2 mag V22 []?=99.99 MSU photometry for star V22 148 A1 --- u_V22 Uncertainty flag on V22 150-154 F5.2 mag V23 []?=99.99 MSU photometry for star V23 155 A1 --- u_V23 Uncertainty flag on V23 157-161 F5.2 mag V24 []?=99.99 MSU photometry for star V24 162 A1 --- u_V24 Uncertainty flag on V24 164-168 F5.2 mag V25 []?=99.99 MSU photometry for star V25 169 A1 --- u_V25 Uncertainty flag on V25 171-175 F5.2 mag V29 []?=99.99 MSU photometry for star V29 176 A1 --- u_V29 Uncertainty flag on V29 178-182 F5.2 mag V30 []?=99.99 MSU photometry for star V30 183 A1 --- u_V30 Uncertainty flag on V30 185-189 F5.2 mag V31 []?=99.99 MSU photometry for star V31 190 A1 --- u_V31 Uncertainty flag on V31 192-196 F5.2 mag V32 []?=99.99 MSU photometry for star V32 197 A1 --- u_V32 Uncertainty flag on V32 199-203 F5.2 mag V35 []?=99.99 MSU photometry for star V35 204 A1 --- u_V35 Uncertainty flag on V35 206-210 F5.2 mag V38 []?=99.99 MSU photometry for star V38 211 A1 --- u_V38 Uncertainty flag on V38 213-217 F5.2 mag V39 []?=99.99 MSU photometry for star V39 218 A1 --- u_V39 Uncertainty flag on V39 220-224 F5.2 mag V40 []?=99.99 MSU photometry for star V40 225 A1 --- u_V40 Uncertainty flag on V40 227-231 F5.2 mag V42 []?=99.99 MSU photometry for star V42 232 A1 --- u_V42 Uncertainty flag on V42 234-238 F5.2 mag V44 []?=99.99 MSU photometry for star V44 239 A1 --- u_V44 Uncertainty flag on V44 241-245 F5.2 mag V49 []?=99.99 MSU photometry for star V49 246 A1 --- u_V49 Uncertainty flag on V49 248-252 F5.2 mag V50 []?=99.99 MSU photometry for star V50 253 A1 --- u_V50 Uncertainty flag on V50 255-259 F5.2 mag V51 []?=99.99 MSU photometry for star V51 260 A1 --- u_V51 Uncertainty flag on V51 262-266 F5.2 mag V52 []?=99.99 MSU photometry for star V52 267 A1 --- u_V52 Uncertainty flag on V52 269-273 F5.2 mag V53 []?=99.99 MSU photometry for star V53 274 A1 --- u_V53 Uncertainty flag on V53 276-280 F5.2 mag V54 []?=99.99 MSU photometry for star V54 281 A1 --- u_V54 Uncertainty flag on V54 283-287 F5.2 mag V65 []?=99.99 MSU photometry for star V65 288 A1 --- u_V65 Uncertainty flag on V65 290-294 F5.2 mag V66 []?=99.99 MSU photometry for star V66 295 A1 --- u_V66 Uncertainty flag on V66 297-301 F5.2 mag V67 []?=99.99 MSU photometry for star V67 302 A1 --- u_V67 Uncertainty flag on V67 304-308 F5.2 mag V74 []?=99.99 MSU photometry for star V74 309 A1 --- u_V74 Uncertainty flag on V74 311-315 F5.2 mag V97 []?=99.99 MSU photometry for star V97 316 A1 --- u_V97 Uncertainty flag on V97 318-322 F5.2 mag V99 []?=99.99 MSU photometry for star V99 323 A1 --- u_V99 Uncertainty flag on V99 325-329 F5.2 mag V113 []?=99.99 MSU photometry for star V113 330 A1 --- u_V113 Uncertainty flag on V113
Byte-by-byte Description of file: table4a table4b table4c table4d
Bytes Format Units Label Explanations
1- 5 I5 --- Frame Frame number 7- 14 F8.3 d HJD-2448000 Heliocentric Date of Observation - 2448000 17- 21 F5.2 mag V3 []?=99.99 WIRO south field phot. for star V3 24- 28 F5.2 mag V4 []?=99.99 WIRO south field phot. for star V4 31- 35 F5.2 mag V5 []?=99.99 WIRO south field phot. for star V5 38- 42 F5.2 mag V11 []?=99.99 WIRO south field phot. for star V11 45- 49 F5.2 mag V12 []?=99.99 WIRO south field phot. for star V12 52- 56 F5.2 mag V13 []?=99.99 WIRO south field phot. for star V13 59- 63 F5.2 mag V14 []?=99.99 WIRO south field phot. for star V14 66- 70 F5.2 mag V15 []?=99.99 WIRO south field phot. for star V15 73- 77 F5.2 mag V35 []?=99.99 WIRO south field phot. for star V35 80- 84 F5.2 mag V38 []?=99.99 WIRO south field phot. for star V38 87- 91 F5.2 mag V39 []?=99.99 WIRO south field phot. for star V39 94- 98 F5.2 mag V40 []?=99.99 WIRO south field phot. for star V40 101-105 F5.2 mag V42 []?=99.99 WIRO south field phot. for star V42 108-112 F5.2 mag V52 []?=99.99 WIRO south field phot. for star V52 115-119 F5.2 mag V53 []?=99.99 WIRO south field phot. for star V53 122-126 F5.2 mag V66 []?=99.99 WIRO south field phot. for star V66 129-133 F5.2 mag V74 []?=99.99 WIRO south field phot. for star V74 136-140 F5.2 mag V113 []?=99.99 WIRO south field phot. for star V113
Byte-by-byte Description of file: table5a table5b table5c table5d
Bytes Format Units Label Explanations
1- 5 I5 --- Frame CCD Frame number 7- 14 F8.3 d HJD-2448000 Heliocentric Date of Observation - 2448000 17- 21 F5.2 mag V1 []?=99.99 WIRO NW field phot. for star V1 24- 28 F5.2 mag V2 []?=99.99 WIRO NW field phot. for star V2 31- 35 F5.2 mag V24 []?=99.99 WIRO NW field phot. for star V24 38- 42 F5.2 mag V30 []?=99.99 WIRO NW field phot. for star V30 45- 49 F5.2 mag V31 []?=99.99 WIRO NW field phot. for star V31 52- 56 F5.2 mag V32 []?=99.99 WIRO NW field phot. for star V32 59- 63 F5.2 mag V67 []?=99.99 WIRO NW field phot. for star V67 66- 70 F5.2 mag V97 []?=99.99 WIRO NW field phot. for star V97
Byte-by-byte Description of file: table6
Bytes Format Units Label Explanations
1- 3 I3 --- Vno [1/113]+ Variable number 5- 7 A3 --- Type RR Lyr Variable type 9- 16 F8.6 d Per Period 20- 27 F8.3 d Ep-2448000 Epoch of maximum, offset JD 2448000 28 A1 --- u_Ep-2448000 Uncertainty flag on Ep-2448000 31- 36 F6.3 mag <V>int ? Intensity averaged V magnitude 37- 38 A2 --- u_<V>int [: ] Uncertainty flag on <V>int (1) 40- 45 F6.3 mag <V>mag ? Averaged V magnitude 46- 47 A2 --- u_<V>mag [: ] Uncertainty flag on <V>mag (1) 50- 54 F5.3 mag <V-R>int ? Intensity averaged V-R color 55- 56 A2 --- u_<V-R>int [: ] Uncertainty flag on <V-R>int (1) 59- 63 F5.3 mag <V-R>mag ? Averaged V-R color 64- 65 A2 --- u_<V-R>mag [: ] Uncertainty flag on <V-R>mag (1) 67- 69 I3 arcsec Radius Distance from cluster center 72- 75 F4.2 mag Av ? Extinction in V band 77- 80 F4.2 mag Ar ? Extinction in R band
Note (1): One colon indicates photometric indices which are good, but not of the best quality; two colons (::) indicate photometric indices for variables with poor light curves or curves with large gaps.
References: Sandage A., Katem B., Sandage M., =1981ApJS...46...41S Bingham E.A., Cacciari C., Dickens R.J., Fusi Pecci F., =1984MNRAS.209..765B Origin: * AAS CD-ROM series, Volume 5, 1995 Lee Brotzman [ADS] 27-Sep-1995 * Reformatted at CDS (F. Ochsenbein), and table6 added.
(End) [CDS] 26-Jul-1996
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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