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 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:
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RA (2000) DE Designation(s)
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21 29 58.2 +12 10 02 M 15 = NGC 7078 = C 2127+119
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File Summary:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table4a table4b table4c table4d
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table5a table5b table5c table5d
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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
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Byte-by-byte Description of file: table6
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Bytes Format Units Label Explanations
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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 int ? Intensity averaged V magnitude
37- 38 A2 --- u_int [: ] Uncertainty flag on int (1)
40- 45 F6.3 mag mag ? Averaged V magnitude
46- 47 A2 --- u_mag [: ] Uncertainty flag on 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
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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.
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References:
Sandage A., Katem B., Sandage M., =1981ApJS...46...41S 1981ApJS...46...41S
Bingham E.A., Cacciari C., Dickens R.J., Fusi Pecci F., =1984MNRAS.209..765B 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