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J/AJ/105/527 Photometry of RR Lyr stars in LMC cluster NGC 1835 (Walker 1993)
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The Large Magellanic Cloud cluster NGC 1835: photometry of the RR Lyrae stars
Walker A.R.
<Astron. J. 105, 527 (1993)>
=1993AJ....105..527W
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ADC_Keywords: Stars, variable ; Clusters, globular ; Photometry, CCD
Abstract:
Photometry is presented for the RR Lyrae variables in the Large
Magellanic Cloud (LMC) cluster NGC 1835. Sixteen new variables have
been discovered. Due to the extreme crowding of the LMC field stars,
the scatter of the light curves and mean magnitudes is greater than
that found for other LMC clusters studied under similar conditions.
The derived parameters of the light curves yield E(B-V) = 0.13 and
[Fe/H] = -1.8, consistent with previous measurements. The complete
sample of RR Lyraes has mean magnitudes <V> = 19.38, <B> = 19.70. If a
distance modulus of 18.5 mag for the LMC is assumed, then in the mean
the NGC 1835 RR Lyraes have <Mv> = 0.48, almost identical to the
average found by the same procedure for the six other LMC clusters.
Objects:
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RA (2000) DE Designation(s)
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04 45 10 -83 59.7 NGC 1841 = ESO 4-15 = C 0444+840
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3 463 36 RR Lyr var. photometry
table4 81 39 Derived quantities for the var. stars
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See also:
J/AJ/112/2020 : UBV Photometry of NGC 1841 (Alcaino+ 1996)
J/PASP/104/1063 : BV Color-Magnitude Diagram for NGC 1851 (Walker 1992)
Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
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1- 11 F11.3 d HJD Heliocentric Julian Date
13- 17 F5.2 mag GR/V1V GR/V1 V magnitude
19- 23 F5.2 mag GR/V1B GR/V1 B magnitude
25- 29 F5.2 mag GR/V3V []? GR/V3 V magnitude
31- 35 F5.2 mag GR/V3B []? GR/V3 B magnitude
37- 41 F5.2 mag GR/V4V []? GR/V4 V magnitude
43- 47 F5.2 mag GR/V4B []? GR/V4 B magnitude
50- 54 F5.2 mag GR/V5V GR/V5 V magnitude
56- 60 F5.2 mag GR/V5B GR/V5 B magnitude
63- 67 F5.2 mag GR/V6V []? GR/V6 V magnitude
69- 73 F5.2 mag GR/V6B []? GR/V6 B magnitude
76- 80 F5.2 mag GR/V7V []? GR/V7 V magnitude
82- 86 F5.2 mag GR/V7B []? GR/V7 B magnitude
89- 93 F5.2 mag GR/V8V []? GR/V8 V magnitude
95- 99 F5.2 mag GR/V8B []? GR/V8 B magnitude
102-106 F5.2 mag GR/V9V []? GR/V9 V magnitude
108-112 F5.2 mag GR/V9B []? GR/V9 B magnitude
115-119 F5.2 mag GR/V11V []? GR/V11 V magnitude
121-125 F5.2 mag GR/V11B []? GR/V11 B magnitude
128-132 F5.2 mag GR/V13V []? GR/V13 V magnitude
134-138 F5.2 mag GR/V13B []? GR/V13 B magnitude
141-145 F5.2 mag GR/V14V GR/V14 V magnitude
147-151 F5.2 mag GR/V14B GR/V14 B magnitude
154-158 F5.2 mag GR/V15V []? GR/V15 V magnitude
160-164 F5.2 mag GR/V15B []? GR/V15 B magnitude
167-171 F5.2 mag GR/V16V []? GR/V16 V magnitude
173-177 F5.2 mag GR/V16B []? GR/V16 B magnitude
180-184 F5.2 mag GR/V17V []? GR/V17 V magnitude
186-190 F5.2 mag GR/V17B []? GR/V17 B magnitude
193-197 F5.2 mag GR/V18V []? GR/V18 V magnitude
199-203 F5.2 mag GR/V18B []? GR/V18 B magnitude
206-210 F5.2 mag GR/V19V []? GR/V19 V magnitude
212-216 F5.2 mag GR/V19B []? GR/V19 B magnitude
219-223 F5.2 mag GR/V20V []? GR/V20 V magnitude
225-229 F5.2 mag GR/V20B []? GR/V20 B magnitude
232-236 F5.2 mag GR/V22V GR/V22 V magnitude
238-242 F5.2 mag GR/V22B GR/V22 B magnitude
245-249 F5.2 mag GR/V23V GR/V23 V magnitude
251-255 F5.2 mag GR/V23B GR/V23 B magnitude
258-262 F5.2 mag GR/V24V []? GR/V24 V magnitude
264-268 F5.2 mag GR/V24B []? GR/V24 B magnitude
271-275 F5.2 mag GR/V25V []? GR/V25 V magnitude
277-281 F5.2 mag GR/V25B []? GR/V25 B magnitude
284-288 F5.2 mag GR/V26V GR/V26 V magnitude
290-294 F5.2 mag GR/V26B GR/V26 B magnitude
297-301 F5.2 mag GR/V27V []? GR/V27 V magnitude
303-307 F5.2 mag GR/V27B []? GR/V27 B magnitude
310-314 F5.2 mag GR/V28V GR/V28 V magnitude
316-320 F5.2 mag GR/V28B GR/V28 B magnitude
323-327 F5.2 mag GR/V29V []? GR/V29 V magnitude
329-333 F5.2 mag GR/V29B []? GR/V29 B magnitude
336-340 F5.2 mag GR/V30V []? GR/V30 V magnitude
342-346 F5.2 mag GR/V30B []? GR/V30 B magnitude
349-353 F5.2 mag GR/V31V []? GR/V31 V magnitude
355-359 F5.2 mag GR/V31B []? GR/V31 B magnitude
362-366 F5.2 mag GR/V32V []? GR/V32 V magnitude
368-372 F5.2 mag GR/V32B []? GR/V32 B magnitude
375-379 F5.2 mag GR/V33V []? GR/V33 V magnitude
381-385 F5.2 mag GR/V33B []? GR/V33 B magnitude
388-392 F5.2 mag GR/V34V GR/V34 V magnitude
394-398 F5.2 mag GR/V34B GR/V34 B magnitude
401-405 F5.2 mag GR/V35V []? GR/V35 V magnitude
407-411 F5.2 mag GR/V35B []? GR/V35 B magnitude
414-418 F5.2 mag GR/V36V GR/V36 V magnitude
420-424 F5.2 mag GR/V36B GR/V36 B magnitude
427-431 F5.2 mag GR/V37V GR/V37 V magnitude
433-437 F5.2 mag GR/V37B GR/V37 B magnitude
440-444 F5.2 mag GR/V38V []? GR/V38 V magnitude
446-450 F5.2 mag GR/V38B []? GR/V38 B magnitude
453-457 F5.2 mag GR/V39V GR/V39 V magnitude
459-463 F5.2 mag GR/V39B GR/V39 B magnitude
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Note:
GR/V1 to GR/V23: stars discovered by Graham J.A. & Ruiz M.T.
(1974, AJ, 79, 363, GR)
GR/V24 to GR/v39: new variable stars from this paper
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Byte-by-byte Description of file: table4
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Bytes Format Units Label Explanations
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1- 2 I2 --- GR/V GR/V denomination
9- 12 I4 --- Walker []? Walker denomination
17- 23 F7.5 d P(GR) []? GR period
25- 31 F7.5 d P(W) []? Walker period
33- 37 F5.2 mag <V> []? Mean V magnitude
38 A1 --- u_<V> uncertainty flag on <V>
41- 45 F5.2 mag <B> []? Mean B magnitude
46 A1 --- u_<B> uncertainty flag on <B>
49- 52 F4.2 mag B-V []? B-V color
53 A1 --- u_B-V uncertainty flag on B-V
57- 60 F4.2 mag (B-V)min []? Minimun B-V color
61 A1 --- u_(B-V)min uncertainty flag on (B-V)min
65- 68 F4.2 mag Av []? Absorption in V
69 A1 --- u_Av uncertainty flag on Av
73- 77 F5.3 mag Ab []? Absorption in B
78 A1 --- u_Ab uncertainty flag on Ab
80- 81 I2 --- Note []? See note (1)
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Note (1):
1: GR1. Periods of several days are poorly constrained by the data available,
and other periods with a frequency spacing of ~0.03 day^-1^ are possible,
although giving noticeably poorer light-curves. With the adopted period
the phases near maximum have been missed, even so, the star is much too
faint to be an LMC Cepheid which would be expected to have <V> = 15.4
2: GR2. Red variable. Mean magnitudes: HJD=2448207 (V=16.19, B=18.16),
HJD=2448248 (V=16.89, B=18.91), HJD=2448279 (V=17.53, B=19.40)
3: GR4. Eclipsing binary
4: GR9. Low amplitude, noisy light-curve. The period is uncertain. A star of
similar magnitude is at 1.5 arcsec separation.
5: GR10. Not measured
6: GR11. The GR period was adopted. The mean magnitudes are very faint,
probably due to elevation of the sky by an adjacent bright star.
7: GR12. This star is the closest known variable to the cluster center.
Only a few measurements were possible, and these scatter badly when passed
with the GR period, so have been discussed.
8: GR16. Only a few useful observations, with a large phase gap.
9: GR17. Large phase gap due to the period being almost exactly 0.5 days.
10: GR20. GR period adopted.
11: GR21. No such star is marked on the GR chart although a period and light
curve are given. None of the new variables found match the period.
12: GR37. Blended with another star. Photometry is very bright, almost
certainly due to insufficient subtraction of the companion star.
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Origin: AAS CD-ROM series, Volume 1, 1993
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(End) Patricia Bauer [CDS] 06-Jul-1994