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J/AJ/105/527    Photometry of RR Lyr stars in LMC cluster NGC 1835 (Walker 1993)

The Large Magellanic Cloud cluster NGC 1835: photometry of the RR Lyrae stars Walker A.R. <Astron. J. 105, 527 (1993)> =1993AJ....105..527W
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: ----------------------------------------------------- RA (2000) DE Designation(s) ----------------------------------------------------- 04 45 10 -83 59.7 NGC 1841 = ESO 4-15 = C 0444+840 ----------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3 463 36 RR Lyr var. photometry table4 81 39 Derived quantities for the var. stars
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
Bytes Format Units Label Explanations
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
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 Byte-by-byte Description of file: table4
Bytes Format Units Label Explanations
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)
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.
Origin: AAS CD-ROM series, Volume 1, 1993
(End) Patricia Bauer [CDS] 06-Jul-1994
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