J/MNRAS/505/6051 Arecibo sample variability properties (Jimenez-Esteban+, 2021)
An infrared study of Galactic OH/IR stars.
III. Variability properties of the Arecibo sample.
Jimenez-Esteban F.M., Engels D., Aguado D.S., Gonzalez J.B., Garcia-Lario P.
<Mon. Not. R. Astron. Soc. 505, 6051-6068 (2021)>
=2021MNRAS.505.6051J 2021MNRAS.505.6051J (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Photometry, infrared ; Infrared sources
Keywords: stars: AGB and post-AGB - stars: evolution -
stars: variable: general - infrared: stars
Abstract:
We present the results of a near-infrared (NIR) monitoring
program carried out between 1999 and 2005 to determine the variability
properties of the `Arecibo sample of OH/IR stars'. The sample consists
of 385 IRAS-selected Asymptotic Giant Branch (AGB) candidates, for
which their O-rich chemistry has been proven by the detection of 1612
MHz OH maser emission. The monitoring data was complemented by data
collected from public optical and NIR surveys. We fitted the light
curves obtained in the optical and NIR bands with a model using an
asymmetric cosine function, and derived a period for 345 sources ∼90%
of the sample). Based on their variability properties, most of the
Arecibo sources are classified as long-period large-amplitude variable
stars (LPLAV), 4% as (candidate) post-AGB stars, and 3% remain
unclassified although they are likely post-AGB stars or highly
obscured AGB stars. The period distribution of the LPLAVs peaks at
∼400d, with periods between 300 and 800d for most of the sources,
and has a long tail up to ∼2100d. Typically, the amplitudes are
between 1 and 3 mag in the NIR and between 2 and 6 mag in the optical.
We find correlations between periods and amplitudes, with larger
amplitudes associated to longer periods, as well as between the period
and the infrared colours, with the longer periods linked to the redder
sources. Among the post-AGB stars, the light curve of IRAS 19566+3423
was exceptional, showing a large systematic increase (>0.4mag/yr) in
K-band brightness over 7 years.
Description:
Four tables of the publication are presented here. The first one
contains the full list of sources, their coordinates with the
reference from which this information has been extracted, and their
classification derived in these work. The second table presents the
NIR (JHK bands) photometry data from our observations and from public
catalogues, used to derive the variability properties of the sample.
This table contains the observing epoch, the magnitude with its error
for each NIR band, and the origin of the data, either from our
monitoring program or from 2MASS, DENIS, or UKIDSS archival data. The
third table contains the observed variability properties of each
source. This table lists for each object the number of photometric
points, the variability amplitude as the difference between the
maximum and the minimum observed magnitude, and the arithmetic mean
magnitude of the observational data, for the three NIR bands and the
optical, and in the last column it is the origin of the optical data
collected from the public surveys. The fourth table contains the
result of the light curves analysis. It list the value of the
different parameters that define each light curve, and the final
periods accompanied by a field that refers to the data used to obtain
the combined period: O for optical; J, H, and K for each NIR bands;
and 'Lit' for literature origin.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 80 385 Arecibo sources positions and classifications
table3.dat 41 11135 Near-IR photometry
table5.dat 94 385 Observed variability properties
table6.dat 189 348 Result of the light curves fitting
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See also:
J/A+A/431/779 : Optical/near-IR atlas of OH/IR stars (Jimenez-Esteban+, 2005)
J/A+A/446/773 : GLMP sample of galactic OH/IR stars (Jimenez-Esteban+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- IRAS IRAS name (HHMMm+DDMM)
12- 29 A18 --- OName Other name
31- 49 F19.15 deg RAdeg ICRS (Hipparcos) Right Ascension (J2000.0)
51- 70 F20.17 deg DEdeg ICRS (Hipparcos) Declination (J2000.0 )
72- 78 A7 --- CRef Coordinates Source (AllWISE or 2MASS)
80 I1 --- Group [1/4] Flag for groups (1)
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Note (1): Flag for groups as follows:
1 = LPLAV
2 = Post-AGBs
3 = Unclassified
4 = YSO; RSG; False OH detection; Irregular;
Optical low-amplitude regular variability
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- IRAS IRAS name (HHMMm+DDMM)
12- 18 I7 d JD Julian day
20 A1 --- Filter [JHK] NIR filter
22- 27 F6.3 mag mag Observed magnitude in Filter
30- 34 F5.3 mag e_mag Observed magnitude error
36- 41 A6 --- Origin Origin of the data:
NIR-MP; 2MASS; DENIS; UKIDDS
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Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- IRAS IRAS name (HHMMm+DDMM)
12- 13 I2 --- o_Jmag ?=0 Number of J band photometric measurements
16- 19 F4.2 mag AmpJ ?=- Observational amplitude in the J band
25- 29 F5.2 mag JmagMean ?=- Observational mean magnitude in the J band
31- 32 I2 --- o_Hmag ?=0 Number of H band photometric measurements
35- 38 F4.2 mag AmpH ?=- Observational amplitude in the H band
44- 48 F5.2 mag HmagMean ?=- Observational mean magnitude in the H band
50- 51 I2 --- o_Kmag ?=0 Number of K band photometric measurements
54- 57 F4.2 mag AmpK ?=- Observational amplitude in the K band
63- 67 F5.2 mag KmagMean ?=- Observational mean magnitude in the K band
69- 72 I4 --- o_Omag ?=- Number of optical photometric measurements
75- 78 F4.2 mag AmpO ?=- Observational amplitude in the optical
84- 88 F5.2 mag OmagMean ?=- Observational mean magnitude in the optical
90- 94 A5 --- Survey [ABCDEG] Source of optical data (1)
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Note (1): Source of optical data as follows:
A = ASAS
B = ASAS-SN
C = AAVSO
D = OMC
E = Gaia BP band
G = Gaia G band
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- IRAS IRAS name (HHMMm+DDMM)
12- 15 A4 --- Bands [OJHK Lit] Band used for the combined
period (1)
17- 20 I4 d P Final period of the periods in the
individual bands listed in 'Bands' or
from the literature 'Lit'
22- 24 I3 d e_P ? Final period error
26 A1 --- FitLCO [SA] Type of optical light curve fit (2)
28- 30 I3 d FitPerO ? Fitted optical period
32- 34 I3 d e_FitPerO ? Fitted optical period error
36- 39 F4.2 mag FitAmpO ?=- Fitted optical light curve amplitude
41- 46 F6.3 mag FitOmagMean ?=- Fitted optical light curve
mean magnitude
48- 51 F4.2 --- FitAsyFactO ?=- Fitted optical light curve
asymmetric factor
53- 59 I7 d Fitt0O ? Fitted optical band t0 Julian Day
61 A1 --- FitLCJ [SA] Type of J band light curve (2)
63- 66 I4 d FitPerJ ? Fitted J band period
68- 71 I4 d e_FitPerJ ? Fitted J band period error
73- 76 F4.2 mag FitAmpJ ?=- Fitted J band light curve amplitude
78- 83 F6.3 mag FitJmagMean ?=- Fitted J band fitted light curve
mean magnitude
85- 94 F10.8 --- FitAsymFactJ ?=- Fitted J band light curve
asymmetric factor
96-102 I7 d Fitt0J ? Fitted J band t0 Julian Day
104 A1 --- FitLCH [SA] Type of H band light curve (2)
106-109 I4 d FitPerH ? Fitted H band period
111-113 I3 d e_FitPerH ? Fitted H band period error
115-118 F4.2 mag FitAmpH ?=- Fitted H band light curve amplitude
120-125 F6.3 mag FitHmagMean ?=- Fitted H band fitted light curve
mean magnitude
127-137 F11.9 --- FitAsymFactH ?=- Fitted H band light curve
asymmetric factor
139-145 I7 d Fitt0H ? Fitted H band t0 Julian Day
147 A1 --- FitLCK [SA] Type of K band light curve (2)
149-152 I4 d FitPerK ? Fitted K band period
154-157 I4 d e_FitPerK ? Fitted K band period error
159-162 F4.2 mag FitAmpK ?=- Fitted K band light curve amplitude
164-169 F6.3 mag FitKmagMean ?=- Fitted K band fitted light curve
mean magnitude
171-181 F11.9 --- FitAsymFactK ?=- Fitted K band light curve
asymmetric factor
183-189 I7 d Fitt0K ? Fitted K band t0 Julian Day
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Note (1): Band used for the combined period as follows:
O = optical
J = J band
H = H band
K = K band
Lit = Literature
Note (2): Type of optical light curve fit as follows:
S = Symmetric
A = Asymmetric
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Acknowledgements:
Francisco Jimenez-Esteban, fran.jimenez-esteban(at)cab.inta-csic.es
References:
Jimenez-Esteban et al., Paper I 2005A&A...431..779J 2005A&A...431..779J, Cat. J/A+A/431/779
Jimenez-Esteban et al., Paper II 2006A&A...446..773J 2006A&A...446..773J, Cat. J/A+A/446/773
(End) Patricia Vannier [CDS] 28-May-2021