J/PASP/125/639 Times of Maxima for the SX Phe star BL Cam (Conidis+, 2013)
Period Changes in SX Phoenicis Stars: IV. BL Camelopardali.
Conidis G.J., Delaney P.A.
<Publ. Astron. Soc. Pac. 125, 639 (2013)>
=2013PASP..125..639C 2013PASP..125..639C
ADC_Keywords: Stars, variable ; Photometry, CCD
Keywords: stars: delta scuti pulsators: SX Phe pulsators -
stars: times of maxima: photometry
Abstract:
A total of 73 new times of maximum light for BL Cam were observed
through the years 2005 to 2011, which are combined with 1392 times of
maxima taken from literature. A more accurate period of 0.039097912(1)
days was found, and an updated linear ephemeris is presented. This
newly presented linear ephemeris was used to calculate revised O minus
C values, which were fitted with a parabolic curve to measure the rate
of change of the pulsation period, found to be
(1/P)(dP/dt)=1.37±0.02x10-7yr-1. Although the parabolic fit has a
physical interpretation, it is noted that a cubic more appropriately
fits the behavior of the O minus C diagram.
Description:
Newly calculated O-C (observed minus calculated) values for the SX Phe
star, BL Cam, are combined with all times of maxima available in
literature. The calculated values are generated from the newly
presented linear ephemeris (equation 2). For each time of maxima, the
source from which the maxima was acquired from, the time of maxima in
HJD, the cycle number from our newly presented linear ephemeris, and
the O-C value are presented in the order as just stated.
Objects:
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RA (2000) DE Designation(s)
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03 47 19.9 +63 22 42 BL Cam = GSC 04067-00471
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 53 1465 All O-C values for BL Cam
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See also:
J/PASP/123/26 : Time of Maxima for the SX Phe star XX Cyg (Conidis+ 2011)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d Tmax Time of Maximum Light (HJD)
15- 20 I6 --- Cycle The Cycle Number (1)
22- 31 F10.7 d O-C Observed minus Calculated Value
33 A1 --- --- [(]
34- 52 A19 --- BibCode Reference for the time of maxima
(the 19-digit bibcode)
53 A1 --- --- [)]
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Note (1): Calculated from equation 2:
HJDmax = 2443125.7943 + 0.039097912 E
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Acknowledgements:
George James Conidis, gconidis(at)yorku.ca
References:
Blake et al., Paper I 2000JRASC..94..124B 2000JRASC..94..124B
Blake et al., Paper II 2003PASP..115..212B 2003PASP..115..212B
Conidis et al., Paper III 2011PASP..123...26C 2011PASP..123...26C
(End) George J. Conidis [York U., Canada], Patricia Vannier [CDS] 01-Jul-2013