J/AJ/147/105 Light curve of HR Lyr over 1991-2012 (Honeycutt+, 2014)
The 1991-2012 light curve of the old nova HR Lyrae.
Honeycutt R.K., Shears J., Kafka S., Robertson J.W., Henden A.A.
<Astron. J., 147, 105 (2014)>
=2014AJ....147..105H 2014AJ....147..105H
ADC_Keywords: Novae ; Stars, variable ; Binaries, cataclysmic ; Photometry
Keywords: novae, cataclysmic variables - stars: individual: HR Lyr
Abstract:
The 22 yr light curve of HR Lyr, acquired with a typical cadence of
2-6 days, is examined for periodic and quasi-periodic variations. No
persistent periodicities are revealed. Rather, the light curve
variations often take the form of nearly linear rises and falls having
typical e-folding times of about 100 days. Occasional ∼0.6mag
outbursts are also seen, with properties similar to those of small
outbursts found in some nova-like cataclysmic variables. When the
photometry is formed into yearly averages, a decline of
0.012±0.005mag/yr is apparent, consistent with the fading of
irradiation-induced Mdot following the nova. The equivalent width of
Hα is tabulated at three epochs over the interval 1986-2008 in
order to compare with a recent result for DK Lac in which Hα was
found to be fading 50 yr after the nova. However, our results for such
a fading in HR Lyr are inconclusive.
Description:
Most of our HR Lyr photometry was acquired from unattended 0.41m and
1.25m telescopes at the Morgan-Monroe Observatory (MMO) of Indiana
University. All of the MMO images were in the V band. A full
description of the facility can be found in Honeycutt et al. (2013,
cat. J/PASP/125/126). The telescopes employed, the CCD and filters
used, and the data reduction procedures varied somewhat over the 22yr
interval 1991-2012, leading us to divide the data into five campaigns
(Table1).
Objects:
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RA (ICRS) DE Designation(s)
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18 53 25.05 +29 13 37.7 V* HR Lyr = HD 175268
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 55 6 HR Lyr photometry by observing campaign
table2.dat 41 1802 HR Lyr light curve data
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See also:
J/PASP/125/126 : Light curve of CR Boo over 1990-2012 (Honeycutt+, 2013)
J/PASP/109/441 : Northern Cataclysmic Variables (Henden+ 1997)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Camp Campaign code (1)
7- 10 F4.2 m Tel ? Telescope size
11 A1 --- --- [m]
13- 22 A10 --- Cam Camera
24- 27 I4 yr Year0 [1990/2011] Starting year of observation
28 A1 --- --- [-]
29- 32 I4 yr Year1 [1991/2012] Ending year of observation
34- 36 I3 --- Np [31/924] Number of points in Campaign
38- 40 I3 --- Nstar [116/142]? Number of ensemble field stars in
the photometric solution
42- 46 F5.3 mag <Err> [0.023/0.035]? Mean error of the variable from
the incomplete ensemble solution
48- 49 I2 --- Nstd [10/12]? Number of secondary standards used (2)
51- 55 F5.3 mag Err [0.007/0.009]? Error in the light curve
zeropoint using the secondary standards
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Note (1): Described more fully in Honeycutt et al. (2013, cat. J/PASP/125/126):
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Campaign Tel Range Duration CCD
(yr)
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A 0.41-m 1990.87-1991.98 1.11 TI 800
B 0.41-m 1992.08-2005.17 13.09 Tek 512
C 1.25-m 2006.58-2009.42 2.84 PXL Tek 1024
D 1.25-m 2010.75-2012.88 2.13 SBIG Kodak 1024
E 0.41-m 2011.65-2012.88 1.23 SBIG Kodak 1024
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Morgan-Monroe Observatory (MMO) photometry is not available for much of 2005,
2006, and 2010. During intervals when the MMO data was sparse, the light curve
was augmented by the addition of photometry acquired at the Bunbury
Observatory, and by AAVSO data.
Note (2): From Henden & Honeycutt (1997, cat. J/PASP/109/441).
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d JD Julian Date of the observation
15- 20 F6.3 mag Vmag The V band magnitude
22- 26 F5.3 mag e_Vmag ? Error in Vmag
28- 32 A5 --- Camp Campaign code (see Table1)
34- 41 A8 --- f_Camp Flag about the filter used (1)
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Note (1):
V-band = AAVSO/Bunbury Observatory data through the V filter.
V from C = The Bunbury exposures and a portion of the AAVSO data were acquired
using a "clear" filter, whose zeropoint was established using V
secondary standards.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 15-Sep-2014