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J/A+A/515/A39       BL Cam light maximum times              (Fauvaud+, 2010)

The field high-amplitude SX Phe variable BL Cam: results from a multisite photometric campaign. II. Evidence for a binary - possibly triple - system. Fauvaud S., Sareyan J.-P., Ribas I., Rodriguez E., Lampens P., Klingenberg G., Farrell J.A., Fumagalli F., Simonetti J.H., Wolf M., Santacana G., Zhou A.-Y., Michel R., Fox-Machado L., Alvarez M., Nava-Vega A., Lopez-Gonzalez M.J., Casanova V.M., Aceituno F.J., Scheggia I., Rives J.-J., Hintz E.G., Van Cauteren P., Helvaci M., Yesilyaprak C., Graham K.A., Kral L., Kocian R., Kucakova H., Fauvaud M., Granslo B.H., Michelet J., Nicholson M.P., Vugnon J.-M., Kotkova L., Truparova K., Ulusoy C., Yasarsoy B., Avdibegovic A., Blaiek M., Kliner J., Zasche P., Bartosikova S., Vilasek M., Trondal O., Van Den Abbeel F., Behrend R., Wucher H. <Astron. Astrophys. 515, A39 (2010)> =2010A&A...515A..39F
ADC_Keywords: Stars, variable ; Stars, double and multiple Keywords: stars: variables: delta Scuti - stars: individual: BL Camelopardalis - stars: oscillations - binaries: general - techniques: photometric Abstract: Short-period high-amplitude pulsating stars of Population I (delta Sct stars) and II (SX Phe variables) exist in the lower part of the classical (Cepheid) instability strip. Most of them have very simple pulsational behaviours, only one or two radial modes being excited. Nevertheless, BL Cam is a unique object among them, being an extreme metal-deficient field high-amplitude SX Phe variable with a large number of frequencies. Based on a frequency analysis, a pulsational interpretation was previously given. We attempt to interpret the long-term behaviour of the residuals that were not taken into account in the previous Observed-Calculated (O-C) short-term analyses. Description: An investigation of the O-C times has been carried out, using a data set based on the previous published times of light maxima, largely enriched by those obtained during an intensive multisite photometric campaign of BL Cam lasting several months. Objects: -------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------- 03 47 19.8 +63 22 43 BL Cam = V* BL Cam -------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 45 959 New HJD and BJD light maximum times of BL Cam
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 13 F13.5 d HJDmax HJD light maximum time (UTC scale) 15- 27 F13.5 d BJDmax BJD light maximum time (TDB scale) 29- 35 F7.5 d e_HJDmax rms uncertainty on light maximum time 37- 39 A3 --- Filt Filter(s) (1) 41- 45 A5 --- Source Source (2)
Note (1): When several filters are mentioned, the corresponding light maximum was determined as a mean value between the different colors' light Note (2): Sources as follows: Mar96 = Martin (1996CCDA....3c...7M ) Mar01 = Martin (2001, http://www.kingsu.ab.ca/~brian/astro/cba_alta/data_archive/blcam/blcam.html) AAVSO = AAVSO database new = our new work
Acknowledgements: Eloy Rodriguez Martinez, eloy(at)iaa.es References: Rodriguez et al., Paper I, 2007A&A...471..255R
(End) Patricia Vannier [CDS] 28-Feb-2010
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