J/AJ/167/200 Light curves for 39 long period variable stars (Cadmus, 2024)
The Long-term Photometric Behavior of 39 Semiregular Variable Stars.
Cadmus R.R.J.
<Astron. J., 167, 200 (2024)>
=2024AJ....167..200C 2024AJ....167..200C
ADC_Keywords: Stars, variable; Photometry, UBV
Keywords: Long period variable stars ; Semi-regular variable stars ;
Stellar pulsations ; Pulsation modes ; Multi-periodic pulsation
; Photometry
Abstract:
Photometric measurements of the light and color variations of 39
semiregular variable stars over a 30yr time interval have been used
to explore the systematics of these variations. These results show the
complex nature of the frequency compositions of the light curves of
these stars. The frequencies present in the light curves tend to be
harmonic in nature, suggesting that both modes of pulsation and shape
effects may be involved and the nature of the variations indicates
that stochastic excitation is involved.
Description:
Thirty-nine stars were observed between 1984 and 2022. The
observations relevant to this paper consisted of V- and B-band
differential photometry acquired with the 0.61m telescope at the Grant
O. Gale Observatory of Grinnell College using an uncooled 1P21
photomultiplier. The data were corrected for differential extinction
and transformed to the Johnson UBV system.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
objects.dat 8 39 Objects studied in this work
rsaqr.dat 34 95 Gale Observatory differential light curve of RS Aqr
rscnc.dat 34 967 Gale Observatory differential light curve of RS Cnc
rscyg.dat 39 1149 Gale Observatory differential light curve of RS Cyg
rslac.dat 34 978 Gale Observatory differential light curve of RS Lac
rthya.dat 31 146 Gale Observatory differential light curve of RT Hya
ruand.dat 34 908 Gale Observatory differential light curve of RU And
rucyg.dat 33 1033 Gale Observatory differential light curve of RU Cyg
rumi.dat 32 1109 Gale Observatory differential light curve of R UMi
rvand.dat 35 1394 Gale Observatory differential light curve of RV And
rvpeg.dat 32 105 Gale Observatory differential light curve of RV Peg
rwboo.dat 35 1056 Gale Observatory differential light curve of RW Boo
rxboo.dat 37 1093 Gale Observatory differential light curve of RX Boo
rydra.dat 35 1115 Gale Observatory differential light curve of RY Dra
rzuma.dat 34 1080 Gale Observatory differential light curve of RZ Uma
saql.dat 37 1029 Gale Observatory differential light curve of S Aql
saur.dat 36 875 Gale Observatory differential light curve of S Aur
sper.dat 35 981 Gale Observatory differential light curve of S Per
stuma.dat 34 1076 Gale Observatory differential light curve of ST Uma
swvir.dat 35 691 Gale Observatory differential light curve of SW Vir
sxher.dat 33 1048 Gale Observatory differential light curve of SX Her
ttcyg.dat 34 1093 Gale Observatory differential light curve of TT Cyg
uboo.dat 34 1011 Gale Observatory differential light curve of U Boo
ucam.dat 34 1075 Gale Observatory differential light curve of U Cam
udel.dat 34 1034 Gale Observatory differential light curve of U Del
ulmi.dat 33 894 Gale Observatory differential light curve of U Lmi
uper.dat 34 974 Gale Observatory differential light curve of U Per
uxdra.dat 34 1119 Gale Observatory differential light curve of Ux Dra
v778cyg.dat 33 826 Gale Observatory differential light curve of V778 Cyg
vboo.dat 33 1047 Gale Observatory differential light curve of V Boo
vcvn.dat 33 1096 Gale Observatory differential light curve of V Cvn
wcyg.dat 33 1137 Gale Observatory differential light curve of W Cyg
wtau.dat 34 845 Gale Observatory differential light curve of W Tau
wzcas.dat 34 1064 Gale Observatory differential light curve of WZ Cas
xher.dat 34 1141 Gale Observatory differential light curve of X Her
xlib.dat 32 22 Gale Observatory differential light curve of X Lib
xmon.dat 34 719 Gale Observatory differential light curve of X Mon
zuma.dat 33 1011 Gale Observatory differential light curve of Z UMa
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See also:
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
J/MNRAS/493/1388 : Asteroseismology luminous red giants with Kepler (Yu+, 2020)
Byte-by-byte Description of file: objects.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Object identifier
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Byte-by-byte Description of file: rsaqr.dat rscnc.dat rzuma.dat stuma.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d JD Julian Date of observation, JD-2,400,000.0
12- 17 F6.3 mag dVmag Differential V-band (Vega) magnitude (1)
19- 25 F7.3 mag dBV ?=999. Differential B-V color (1)
27- 34 A8 --- Codes Codes (G1)
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Note (1): The dVmag and dBV magnitudes can be converted to V and B-V
values by adding them to the comparison star values in Table 1.
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Byte-by-byte Description of file: rscyg.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d JD Julian Date of observation, JD-2,400,000.0
12- 17 F6.3 mag dVmag Differential V-band (Vega) magnitude (1)
19- 25 F7.3 mag dBV ?=999. Differential B-V color (1)
27- 39 A13 --- Codes Codes (G1)
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Note (1): The dVmag and dBV magnitudes can be converted to V and B-V
values by adding them to the comparison star values in Table 1.
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Byte-by-byte Description of file: rslac.dat ruand.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d JD Julian Date of observation, JD-2,400,000.0
12- 16 F5.3 mag dVmag Differential V-band (Vega) magnitude (1)
18- 24 F7.3 mag dBV ?=999. Differential B-V color (1)
26- 34 A9 --- Codes Codes (G1)
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Note (1): The dVmag and dBV magnitudes can be converted to V and B-V
values by adding them to the comparison star values in Table 1.
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Byte-by-byte Description of file: rthya.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d JD Julian Date of observation, JD-2,400,000.0
12- 17 F6.3 mag dVmag Differential V-band (Vega) magnitude (1)
19- 23 F5.3 mag dBV ?=999. Differential B-V color (1)
25- 31 A7 --- Codes Codes (G1)
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Note (1): The dVmag and dBV magnitudes can be converted to V and B-V
values by adding them to the comparison star values in Table 1.
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Byte-by-byte Description of file: rucyg.dat ulmi.dat v778cyg.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d JD Julian Date of observation, JD-2,400,000.0
12- 16 F5.3 mag dVmag Differential V-band (Vega) magnitude (1)
18- 24 F7.3 mag dBV ?=999. Differential B-V color (1)
26- 33 A8 --- Codes Codes (G1)
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Note (1): The dVmag and dBV magnitudes can be converted to V and B-V
values by adding them to the comparison star values in Table 1.
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Byte-by-byte Description of file: rumi.dat rvpeg.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d JD Julian Date of observation, JD-2,400,000.0
12- 16 F5.3 mag dVmag Differential V-band (Vega) magnitude (1)
18- 24 F7.3 mag dBV ?=999. Differential B-V color (1)
26- 32 A7 --- Codes Codes (G1)
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Note (1): The dVmag and dBV magnitudes can be converted to V and B-V
values by adding them to the comparison star values in Table 1.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: rvand.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.4 d JD Julian Date of observation, JD-2,400,000.0
12- 16 F5.3 mag dVmag Differential V-band (Vega) magnitude (1)
18- 24 F7.3 mag dBV ?=999. Differential B-V color (1)
26- 35 A10 --- Codes Codes (G1)
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Note (1): The dVmag and dBV magnitudes can be converted to V and B-V
values by adding them to the comparison star values in Table 1.
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Byte-by-byte Description of file: rwboo.dat rydra.dat sper.dat swvir.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d JD Julian Date of observation, JD-2,400,000.0
12- 17 F6.3 mag dVmag Differential V-band (Vega) magnitude (1)
19- 25 F7.3 mag dBV ?=999. Differential B-V color (1)
27- 35 A9 --- Codes Codes (G1)
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Note (1): The dVmag and dBV magnitudes can be converted to V and B-V
values by adding them to the comparison star values in Table 1.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: rxboo.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d JD Julian Date of observation, JD-2,400,000.0
12- 16 F5.3 mag dVmag Differential V-band (Vega) magnitude (1)
18- 24 F7.3 mag dBV ?=999. Differential B-V color (1)
26- 37 A12 --- Codes Codes (G1)
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Note (1): The dVmag and dBV magnitudes can be converted to V and B-V
values by adding them to the comparison star values in Table 1.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: saql.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d JD Julian Date of observation, JD-2,400,000.0
12- 17 F6.3 mag dVmag Differential V-band (Vega) magnitude (1)
19- 25 F7.3 mag dBV ?=999. Differential B-V color (1)
27- 37 A11 --- Codes Codes (G1)
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Note (1): The dVmag and dBV magnitudes can be converted to V and B-V
values by adding them to the comparison star values in Table 1.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: saur.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d JD Julian Date of observation, JD-2,400,000.0
12- 17 F6.3 mag dVmag Differential V-band (Vega) magnitude (1)
19- 25 F7.3 mag dBV ?=999. Differential B-V color (1)
27- 36 A10 --- Codes Codes (G1)
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Note (1): The dVmag and dBV magnitudes can be converted to V and B-V
values by adding them to the comparison star values in Table 1.
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Byte-by-byte Description of file: sxher.dat vboo.dat vcvn.dat wcyg.dat zuma.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d JD Julian Date of observation, JD-2,400,000.0
12- 17 F6.3 mag dVmag Differential V-band (Vega) magnitude (1)
19- 25 F7.3 mag dBV ?=999. Differential B-V color (1)
27- 33 A7 --- Codes Codes (G1)
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Note (1): The dVmag and dBV magnitudes can be converted to V and B-V
values by adding them to the comparison star values in Table 1.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: ttcyg.dat uboo.dat ucam.dat udel.dat uper.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d JD Julian Date of observation, JD-2,400,000.0
12- 17 F6.3 mag dVmag Differential V-band (Vega) magnitude (1)
19- 25 F7.3 mag dBV ?=999. Differential B-V color (1)
27- 34 A8 --- Codes Codes (G1)
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Note (1): The dVmag and dBV magnitudes can be converted to V and B-V
values by adding them to the comparison star values in Table 1.
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Byte-by-byte Description of file: uxdra.dat wtau.dat wzcas.dat xher.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d JD Julian Date of observation, JD-2,400,000.0
12- 17 F6.3 mag dVmag Differential V-band (Vega) magnitude (1)
19- 25 F7.3 mag dBV ?=999. Differential B-V color (1)
27- 34 A8 --- Codes Codes (G1)
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Note (1): The dVmag and dBV magnitudes can be converted to V and B-V
values by adding them to the comparison star values in Table 1.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: xlib.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.4 d JD Julian Date of observation, JD-2,400,000.0
12- 17 F6.3 mag dVmag Differential V-band (Vega) magnitude (1)
19- 25 F7.3 mag dBV ?=999. Differential B-V color (1)
27- 31 A5 --- Codes Codes (G1)
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Note (1): The dVmag and dBV magnitudes can be converted to V and B-V
values by adding them to the comparison star values in Table 1.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: xmon.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.4 d JD Julian Date of observation, JD-2,400,000.0
12- 17 F6.3 mag dVmag Differential V-band (Vega) magnitude (1)
19- 25 F7.3 mag dBV ?=999. Differential B-V color (1)
27- 34 A8 --- Codes Codes (G1)
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Note (1): The dVmag and dBV magnitudes can be converted to V and B-V
values by adding them to the comparison star values in Table 1.
--------------------------------------------------------------------------------
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Note (G1) : Codes for Grinnell Photoelectric Photometry:
The observing sequence was
S,C1,V,C1,V,C1,C2,S where V is the variable, C1 is the comparison
star, C2 is the check star, and S is the sky. X is the airmass.
Each integration was done as 3 subsections to monitor internal
consistency (usually required to be < 1%). In the analysis process
the consistency of the multiple measurements for V and C1, as well
as the consistency between an "early" analysis (using the first S,
C1, V, and C1) and a "late" analysis (using the last C1, V, C1, and
S), was checked.
Observing conditions:
B = Bright sky (strong, variable twilight);
C = Clouds likely to be a problem;
H = Hardware (telescope, instrument, or computer) problems;
J = Extinction coefficient kv > 0.5;
L = Moon almost full or very close to star;
M = Moon rising or setting;
N = Clouds Nearby or thin clouds suspected, but photometer signal not
too bad;
S = Poor seeing;
T = Twilight;
2 = X>2 (2! If X>2.7);
3 = X>3 (3! If X>3.7).
Observing process:
A = Data taken by a student observer;
I = Inconsistent (>1% deviation) data for subsections of an integration;
O = Data for variable or C1 nearly off-scale;
U = Unreliable data;
V = Only V band data are good; throw out B and B-V;
X = Hard to center variable;
Y = Hard to center C1;
Z = Hard to center C2;
- = Throw out C2 (does not affect delta(V) or delta(B-V));
* = Another star nearby;
# = Possible mis-identification of variable or C1 (checked during
analysis);
% = Possible mis-identification of C2 (checked during analysis).
Quality control in analysis:
D = Deviation in multiple measurements for variable or C1 is
large (>4%);
Q = Results of early/late analysis for B inconsistent
(≳ 0.04 mag. deviation);
R = Results of early/late analysis for V inconsistent
(≳ 0.04 mag. deviation);
/ = Star/sky ratio < 1 in V;
@ = Absolute calculations suspect (does not affect delta(V)
or delta(B-V)).
Data processing:
E = Editing performed on file (possibly to salvage partial data);
F = Corrected for variation in sky brightness ;
G = Average of multiple measurements ;
K = Extinction coefficients estimated;
$ = Odd-looking measurement has been checked and retained if no
problems found.
Other:
+ = Other comments; see original source;
? = (Following another code) previous code is uncertain;
! = (Following another code) situation indicated by previous code is
severe.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 03-Jun-2024