J/AJ/158/180 Photometric observations of AE Cassiopeia (Samec+, 2019)
Observation, modern light-curve analysis, and 89 yr period study of
the short-period Algol, AE Cassiopeia.
Samec R.G., Chamberlain H., Caton D.B., Faulkner D.R.
<Astron. J., 158, 180 (2019)>
=2019AJ....158..180S 2019AJ....158..180S (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Stars, variable ; Photometry, VRI
Keywords: Detached binary stars - Stellar evolution - Interacting binary stars -
Eclipsing binary stars - Algol variable stars - Contact binary stars
Abstract:
AE Cas was observed some 40 yr ago by Srivastava & Kandpal
(1984AcA....34..281S 1984AcA....34..281S) and was analyzed by Kopal's Fourier frequency-domain
technique. No further precision observations have taken place until
the present study, which represents the first modern synthetic analysis of
light curves using the 2016 version of the Wilson-Devinney (W-D) Program.
It was observed in 2015 October 2, 3 and 23, inclusive, at Dark Sky
Observatory in North Carolina with the 0.81 m reflector of Appalachian
State University and the 0.9 m reflector at Kitt Peak National Observatory
remotely through the Southeastern Association for Research in Astronomy
(SARA) consortia. V, Rc, Ic observations were taken. Five times of
minimum light were determined from our present observations, which include
three primary eclipses and two secondary eclipses. In addition, eight
observations at minima were introduced as low weighted times of minimum
light from archived All-Sky Automated Survey for Supernovae Variable Star
Catalog (ASAS) data and 74 times of minimum light from the literature,
some of which were from visual observations. This period study covers
an interval of some 89 yr. The period was found to be decaying at a
constant rate with a high level of confidence. A VRcIc simultaneous
W-D Program solution indicates that the system has a mass ratio somewhat
less than unity (q=0.856±0.001), and a component temperature difference
of ∼2060 K. A q-search was performed and the mass ratio minimized at
the above value. The large temperature difference in the components
verifies that the binary is not yet in contact. No spots were needed for
the solution. The fill-out of our model is 83.2% for the primary component
(smaller radius) and 99.1% for the secondary component. So, it is near
a classical Algol configuration.
Description:
The present observations were taken with the Dark Sky Observatory (DSO)
0.81 m reflector at Philips Gap, North Carolina, on 2016 October 2, 3 and
23 (3.7-11.1 UT), inclusive, with a thermoelectrically cooled (-40°C)
2KX2K Apogee Alta by D. Caton with standard VRcIc filters and on
October 23 (1.5-11.7 UT) with the 0.9 m reflector at Kitt Peak National
Observatory (KPNO) remotely through The Southeastern Association for
Research in Astronomy (SARA) consortia with the liquid nitrogen (LN)
cooled (-84.6°C) 2KX2K ARC-E2V42-40 chip camera by R. Samec.
Objects:
-------------------------------------------------------
RA (ICRS) DE Designation(s)
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01 27 00.36 +70 07 38.2 AE Cassiopeia = V* AE Cas
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 44 565 Photometric observations of AE Cas
table3.dat 105 88 O-C residual calculations of AE Cas
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See also:
J/A+A/405/231 : Algol-type eclipsing binaries differential photometry
(Kim+, 2003)
J/A+A/417/263 : Catalogue of Algol type binary stars (Budding+, 2004)
J/other/IBVS/5543 : 163-nd list of minima of eclipsing binaries
(Diethelm+, 2004)
J/other/IBVS/5761 : Minima and maxima of 389 variables (Hubscher+, 2007)
J/other/IBVS/5941 : Minima and maxima of 292 variables (Hubscher+, 2010)
J/other/IBVS/5984 : Minima and maxima of 503 variables (Hubscher, 2011)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 F6.3 mag DVmag [-0.65/0.346]? V band magnitude difference,
variable-comparison
8- 14 F7.4 d HJD-V [3.4915/24.9959]? Heliocentric Julian Date at
V band observation, HJD-2457660
16- 21 F6.3 mag DRcmag [-0.65/0.346]? Rc band magnitude difference,
variable-comparison
23- 29 F7.4 d HJD-Rc [3.4915/24.9959]? Heliocentric Julian Date at
Rc band observation, HJD-2457660
31- 36 F6.3 mag DIcmag [-0.593/0.335]? Ic band magnitude difference,
variable-comparison
38- 44 F7.4 d HJD-Ic [3.4919/24.9891]? Heliocentric Julian Date at
Ic band observation, HJD-2457660
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq [1/88] Sequential running number
4- 13 F10.4 d Epoch [25411.5/57973.982] Epoch (JD-2400000)
15- 22 F8.1 --- Cycle [-42514/381] Cycle number
24- 30 F7.4 --- Res-Lin [-0.0311/0.0293] Linear residuals
32- 38 F7.4 --- Res-Quad [-0.0215/0.0204] Quadratic residuals
40- 64 A25 --- Ref Reference
66-105 A40 --- Bibcode Bibcode of the reference or website
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 17-Dec-2019