J/other/NewA/32.6 BP Peg times of maximum light (Wang+, 2014)
Detection of a cool stellar companion to the delta Scuti variable star BP Peg.
Wang S.-M., Qian S.-B., He J.-J., Zhou X., Zhao E.-G.
<New Astron., 32, 6-9 (2014)>
=2014NewA...32....6W 2014NewA...32....6W
ADC_Keywords: Stars, variable ; Photometry
Keywords: stars: variable: delta Scuti - stars: individuals (BP Peg) -
techniques: photometry
Abstract:
New CCD photometric monitoring on the high-amplitude delta Scuti
variable BP Peg was carried out on November 4, 2013 by using the 1.0-m
reflecting telescope of Yunnan Observatories in China as well as on
December 29, 2013 by using the 85-cm telescope at Xinglong Station of
National Astronomical Observatory in China. BP Peg is a new
high-amplitude delta Scuti variable with a period of 0.10954357-day. We
have collected all the times of light maximum from the literature
together with our data, and the pulsation period changes are analyzed
through Observed-Calculated (O-C) method. With the available data,
we discover that the pulsating period of BP Peg shows a cyclic
oscillation with a period of 24.5-years and an amplitude of
0.0060-days. If the cyclic period changes are caused by light-time
effect in a binary system, the reckoned mass of the hidden companion
could be 0.20M☉ and possibly, it is an M-type star.
Description:
Photometric observations of BP Peg were obtained on November 4, 2013
by using the 1.0-m reflecting telescope at Yunnan Observatories (YNOs)
that is equipped with a Cassegrain-focus multicolor CCD photometer. An
Andor DW436 2K CCD camera together with the wide-band,
Johnson-Cousins Rc and Ic filters, attached to this Cassegrain
telescope is used. To increase the photometric precision, we also
observed the variable star without filters. BP Peg was also observed
on December 29, 2013 by using the 85-cm telescope at the Xinglong
Station of National Astronomical Observatory (NAO). The telescope is
equipped with a primary-focus multi-color CCD photometer where a
PI1024 BFT (Back-illuminated and Frame-Transfer) camera is used as the
detector. The wide-band filter in V was used
during the observations.
Objects:
------------------------------------------------
RA (2000) DE Designation(s)
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21 33 13.53 +22 44 24.3 BP Peg = V* BP Peg
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 47 126 Available times of light maximum of BP Pegasi
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See also:
J/A+AS/93/189 : AE UMa, RV Ari & BP Peg uvby-beta photometry (Rodriguez+ 1992)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 d HJD Heliocentric Julian date (HJD-2400000)
13- 18 A6 --- Det Detector: pe=photoemectric, vi=visual, or
CCD followed by filter
20- 25 I6 d Ep [-6161/124529] Epoch (cycle)
27- 36 E10.4 d (O-C)1 First Observed-Computed value
38- 44 F7.4 d (O-C)2 ?=- Second Observed-Computed value
46- 47 I2 --- Ref Reference (1)
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Note (1): References as follows:
1 = Agerer & Huebscher, 1998IBVS.4606....1A 1998IBVS.4606....1A
2 = Agerer & Huebscher, 2002IBVS.5296....1A 2002IBVS.5296....1A, Cat. J/other/IBVS/5296
3 = Agerer & Huebscher, 2003IBVS.5485....1A 2003IBVS.5485....1A
4 = Agerer et al., 1999IBVS.4712....1A 1999IBVS.4712....1A
5 = Agerer et al., 2001IBVS.5017....1A 2001IBVS.5017....1A
6 = Figer, 1983. GEOS circular on RR Lyr type variables, No. 6.
7 = Huebscher & Lehmann (2012IBVS.6026....1H 2012IBVS.6026....1H
8 = Huebscher, 2005IBVS.5643....1H 2005IBVS.5643....1H
9 = Huebscher, 2011IBVS.5984....1H 2011IBVS.5984....1H, Cat. J/other/IBVS/5984
10 = Huebscher et al., 2005IBVS.5657....1H 2005IBVS.5657....1H
11 = Huebscher et al., 2006IBVS.5731....1H 2006IBVS.5731....1H, Cat. J/other/IBVS/5731
12 = Huebscher et al., 2013IBVS.6048....1H 2013IBVS.6048....1H
13 = Kim et al., 1989PASP..101.1009K 1989PASP..101.1009K
14 = Klingenberg et al., 2006IBVS.5701....1K 2006IBVS.5701....1K
15 = This paper
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 21-May-2015