J/AJ/162/52 Census of variable stars toward Serpens Main (Yin+, 2021)
Census of variable stars toward Serpens Main.
Yin J., Chen Z., Chini R., Haas M., Noroozi S., Yao Y., Jiang Z., Qian X.,
Liu L., Li Y.
<Astron. J., 162, 52-52 (2021)>
=2021AJ....162...52Y 2021AJ....162...52Y (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable; Star Forming Region; Photometry, infrared;
Optical; Parallaxes, trigonometric
Keywords: Variable stars; Catalogs; Eclipsing binary stars
Abstract:
We monitored a 3deg2 area toward Serpens Main in the Pan-STARRS1 r,
i, and z bands from 2016 April to September. Light curves of more than
11000 stars in each band were obtained, and 143 variables have been
identified. Among those, 119 variables are new discoveries, while 24
variables were previously known. We present variability classes and
periods of 99 stars. Of these, 81 are located in the upper giant
branch, displaying long periods, while the remaining 18 variables are
pre-main-sequence objects with short periods. We also identify eight
eclipsing binary systems, including the known binary V0623Ser, and
derive their physical parameters. According to a clustering analysis
of Gaia DR2 stars in the observed field, there are 10 variable members
in Serpens Main, where six members have been classified as young
stellar objects in previous studies. Here we provide color-magnitude
and color-color diagrams for these variables. The color variability of
most variables in the color-magnitude diagrams produces the expected
displacements, while the movements of cluster members point in
different directions; this behavior may be associated with accretion
spots or circumstellar disks.
Description:
The monitoring observations of Serpens Main were conducted with the
robotic BESTII system located at the Observatory Cerro Armazones (OCA)
in Chile. The system consists of a 25cm Baker-Ritchey-Chretien
telescope with a focal ratio of f/5.0, yielding a wide field of view
(FOV) of 1.5x1.5deg. The telescope is equipped with a Peltier-cooled
4kx4k Finger Lakes CCD imager (KAF-16801E2) with a pixel size of
9µm and a pixel scale of 1.5deg/pixel. Serpens Main was observed in
the Pan-STARRS1 r, i, and z filters for 29, 27, and 24 nights,
respectively, from 2016 April 20 to September 17.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 123 143 Parameters of variable stars
table3.dat 58 143 Periods of the variable sources
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)
B/gcvs : General Catalogue of Variable Stars (Samus+, 2007-2017)
V/148 : The MORX catalogue (Flesch, 2016)
IX/46 : XMM-Newton Serendipitous Source Catalogue 3XMM-DR5 (XMM-SSC, 2016)
IX/50 : XMM-Newton Serendipitous Source Catalogue 3XMM-DR6 (XMM-SSC, 2016)
IX/54 : XMM-Newton Serendipitous Source Catalogue 3XMM-DR7 (XMM-SSC, 2017)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
IX/55 : XMM-Newton Serendipitous Source Catalogue 3XMM-DR8 (XMM-SSC, 2018)
J/ApJ/733/50 : Mid-IR photometric monitoring of ONC (Morales-Calderon+, 2011)
J/AN/333/706 : Bochum survey of the southern Galactic disk (Haas+, 2012)
J/AJ/147/82 : Monitoring of disk-bearing stars in NGC 2264 (Cody+, 2014)
J/AJ/148/122 : YSOVAR infrared photometry in Lynds 1688 (Gunther+, 2014)
J/ApJ/762/128 : Spitzer/IRS disk parameters in Serpens (Oliveira+, 2013)
J/AJ/149/103 : Spectroscopy of candidate YSOs in Serpens (Erickson+, 2015)
J/AJ/150/118 : YSOVAR IR photometry in IRAS 20050+2720 (Poppenhaeger+, 2015)
J/AJ/150/132 : JHK photometry of 1203 variables in ONC (Rice+, 2015)
J/AJ/150/145 : YSOVAR infrared photometry in GGD12-15 (Wolk+, 2015)
J/AJ/150/175 : YSOVAR: infrared photometry in NGC 1333 (Rebull+, 2015)
J/ApJS/220/11 : SEDs of Spitzer YSOs in the Gould Belt (Dunham+, 2015)
J/MNRAS/468/931 : Orion Nebula Cluster members VRI photometry (Messina+, 2017)
J/AJ/155/99 : IR variability among YSOs in Serpens South cluster (Wolk+, 2018)
J/A+A/623/A110 : Gaia DR2. Variable stars in CMD (Gaia Collaboration+, 2019)
J/A+A/627/A135 : VRI photometry of IC5070 variable stars (Bhardwaj+, 2019)
J/ApJ/878/111 : Members Serpens Molecular Cloud with Gaia DR2 (Herczeg+, 2019)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- ID Observation identifier
6- 8 A3 --- f_ID Flag on ID (1)
10- 18 F9.5 deg RAdeg [276/279] Ascension (J2000)
21- 29 F9.5 deg DEdeg [0.54/2] Declination (J2000)
32- 36 F5.2 mag rmag [12.6/19.1]? Apparent r band magnitude
38 A1 --- rmaglim [<] Indicates rmag uncertainty is upper limit
39- 42 F4.2 mag e_rmag [0.01/0.06]? Uncertainty in rmag
45- 48 F4.2 mag rAmp [0.08/6.7]? Amplitude of r band
51- 55 F5.2 mag imag [11.04/17.15]? Apparent i band magnitude
57 A1 --- imaglim [<] Indicates imag uncertainty is upper limit
58- 61 F4.2 mag e_imag [0.01/0.04]? Uncertainty in imag
64- 67 F4.2 mag iAmp [0.04/2.97]? Amplitude of i band
70- 74 F5.2 mag zmag [9.02/15.29]? Apparent z band magnitude
76 A1 --- zmaglim [<] Indicates zmag uncertainty is upper limit
77- 80 F4.2 mag e_zmag [0.01/0.03]? Uncertainty in zmag
83- 86 F4.2 mag zAmp [0.03/2.1]? Amplitude of z band
89- 91 A3 --- Bands The satisfied bands (2)
94- 96 A3 --- Ranking The ranking of variables
99-105 F7.4 mas plx [-1.09/3.77] Parallax (3)
107-112 F6.4 mas e_plx [0.03/0.7] Uncertainty in plx
115-123 A9 --- Class ? Type of variables
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Note (1): The a, b and c flags denote known variable objects from GCVS,
VSX and Gaia DR2, respectively. The superscript d denote the
variable object as a member of Serpens Main.
Note (2): The bands in which a star satisfied the criteria of a variable
star are indicated in the column 'Bands'.
Note (3): The parallaxes and parallax errors of the variable objects are
from Gaia DR2; I/345.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- ID Observation identifier
6- 13 F8.4 d Per1 [0.08/188]? MP Period (1)
15 A1 --- f_Per1 [b] Flag on Period1 (2)
17- 24 F8.4 d Per2 [0.1/981]? AoV Period (1)
26 A1 --- f_Per2 [b] Flag on Period2 (2)
28- 35 F8.4 d Per3 [0.1/200]? QMI Period (1)
37 A1 --- f_Per3 [b] Flag on Period3 (2)
39- 44 F6.4 /d FWHM1 [0.0001/0.14]? FWHM of MP Period (3)
46- 51 F6.4 /d FWHM2 [0.0004/0.04]? FWHM of AoV Period (3)
53- 58 F6.4 /d FWHM3 [0.006/0.11]? FWHM of QMI Period (3)
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Note (1): The periods of stars are calculated in the detected bands with
different methods (MP, AoV and QMI). The period of V038 is 0.2905d
in GCVS and VSX. The period of V117 in VSX and Gaia DR2 is 437d
and 528.5d, respectively. The period of V079 in Gaia DR2 and this
work is 89.1d and 7.73d, respectively. The other objects that have
Gaia DR2 periods (in units of d) are V022(230.1), V025(355.2),
V048(164.1), V065(399.9), V067(436.8), V099(329.5), V105(248.2),
V123(297.7), and V142(213.9).
Note (2): The period used to classify the variable has the "b" flag.
Note (3): The full-width half max (FWHM) of the periodogram peaks is obtained
from the three methods (MP, AoV and QMI).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 15-Nov-2021