2019A&A...627A.135B


Query : 2019A&A...627A.135B

2019A&A...627A.135B - Astronomy and Astrophysics, volume 627A, 135-135 (2019/7-1)

Variability of young stellar objects in the star-forming region Pelican Nebula.

BHARDWAJ A., PANWAR N., HERCZEG G.J., CHEN W.P. and SINGH H.P.

Abstract (from CDS):

Context. Pre-main-sequence variability characteristics can be used to probe the physical processes leading to the formation and initial evolution of both stars and planets. Aims. The photometric variability of pre-main-sequence stars is studied at optical wavelengths to explore star-disk interactions, accretion, spots, and other physical mechanisms associated with young stellar objects. Methods. We observed a field of 16'x16' in the star-forming region Pelican Nebula (IC 5070) at BVRI wavelengths for 90 nights spread over one year in 2012-2013. More than 250 epochs in the VRI bands are used to identify and classify variables up to V∼21 mag. Their physical association with the cluster IC 5070 is established based on the parallaxes and proper motions from the Gaia second data release (DR2). Multiwavelength photometric data are used to estimate physical parameters based on the isochrone fitting and spectral energy distributions. Results. We present a catalog of optical time-series photometry with periods, mean magnitudes, and classifications for 95 variable stars including 67 pre-main-sequence variables towards star-forming region IC 5070. The pre-main-sequence variables are further classified as candidate classical T Tauri and weak-line T Tauri stars based on their light curve variations and the locations on the color-color and color-magnitude diagrams using optical and infrared data together with Gaia DR2 astrometry. Classical T Tauri stars display variability amplitudes up to three times the maximum fluctuation in disk-free weak-line T Tauri stars, which show strong periodic variations. Short-term variability is missed in our photometry within single nights. Several classical T Tauri stars display long-lasting (≥10days) single or multiple fading and brightening events of up to two magnitudes at optical wavelengths. The typical mass and age of the pre-main-sequence variables from the isochrone fitting and spectral energy distributions are estimated to be ≤1M and ∼2Myr, respectively. We do not find any correlation between the optical amplitudes or periods with the physical parameters (mass and age) of pre-main-sequence stars. Conclusions. The low-mass pre-main-sequence stars in the Pelican Nebula region display distinct variability and color trends and nearly 30% of the variables exhibit strong periodic signatures attributed to cold spot modulations. In the case of accretion bursts and extinction events, the average amplitudes are larger than one magnitude at optical wavelengths. These optical magnitude fluctuations are stable on a timescale of one year.

Abstract Copyright: © ESO 2019

Journal keyword(s): stars: pre-main sequence - stars: variables: T Tauri, Herbig Ae/Be - open clusters and associations: general - stars: low-mass

VizieR on-line data: <Available at CDS (J/A+A/627/A135): table2.dat table1.dat>

Nomenclature: Tables 1-4: [BPH2019] VNNN (Nos V101-V195).

Simbad objects: 98

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Number of rows : 98
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 2264 OpC 06 40 52 +09 52.6           ~ 1718 0
2 2MASS J20500394+4418425 cC* 20 50 03.9509450760 +44 18 42.562985796       18.648 16.144 ~ 1 0
3 2MASS J20500604+4417489 TT* 20 50 06.0522424320 +44 17 48.997158540   20.604   17.384 15.571 ~ 1 0
4 2MASS J20500617+4425050 TT* 20 50 06.1776623496 +44 25 05.005886124   20.725 19.168 17.567 15.622 ~ 1 0
5 UCAC4 672-086776 V* 20 50 13.5625340472 +44 16 22.423299708   14.851 13.815 13.443   ~ 1 0
6 2MASS J20502242+4419175 TT* 20 50 22.4272232784 +44 19 17.614895088       18.713 16.695 ~ 3 0
7 UCAC4 672-086782 V* 20 50 28.7767148256 +44 23 01.261018104   12.485 11.968 11.742 11.465 ~ 1 0
8 UCAC4 673-089679 V* 20 50 30.3388289592 +44 24 37.015808544   13.289 12.687 12.382 12.033 ~ 1 0
9 UCAC4 672-086784 V* 20 50 30.8190972120 +44 20 47.492275704   13.060 12.481 12.216 11.909 ~ 1 0
10 UCAC4 672-086785 ** 20 50 31.640472 +44 22 54.79032   13.649 12.961 12.623 12.246 ~ 1 0
11 UCAC4 672-086787 V* 20 50 32.1171642864 +44 19 51.885776892   15.316 14.280 13.733 13.231 ~ 1 0
12 EM* LkHA 136 TT* 20 50 33.0735044328 +44 15 38.741456808   20.073 18.231 16.927 15.609 ~ 9 0
13 2MASS J20503695+4421408 TT* 20 50 36.9540300072 +44 21 40.823744976     19.232 17.879 16.510 ~ 6 0
14 EM* LkHA 138 TT* 20 50 36.9896193552 +44 20 49.832982348   17.806 16.348 14.879 13.776 K7e 15 0
15 EM* LkHA 137 TT* 20 50 37.03 +44 18 24.7   17.259 15.741 14.497 13.245 K7IVe 15 0
16 2MASS J20503738+4420531 TT* 20 50 37.3818073920 +44 20 53.063592720   17.914 16.140 14.908 13.640 ~ 8 0
17 2MASS J20503796+4425123 V* 20 50 37.9556424528 +44 25 12.428050728     20.109 17.983 15.936 ~ 1 0
18 2MASS J20504045+4420217 TT* 20 50 40.4489989656 +44 20 21.706449648   21.308 19.451 17.847 15.986 ~ 5 0
19 2MASS J20504053+4420506 TT* 20 50 40.5280843560 +44 20 50.590835412   20.649 18.542 16.879 15.105 ~ 6 0
20 MSX6C G084.5978+00.1408 Or* 20 50 42.80712 +44 21 55.4472   21.015 18.990 17.300 15.622 ~ 9 0
21 2MASS J20504353+4415518 TT* 20 50 43.5289999368 +44 15 51.767174124   19.033 17.570 16.370 15.099 ~ 4 0
22 EM* LkHA 140 TT* 20 50 44.94696 +44 15 55.2492   18.637 17.074 15.682 14.142 ~ 8 0
23 [OSP2002] BRC 31 9 Em* 20 50 44.9660589144 +44 20 58.829870868     19.607 18.192 16.629 ~ 5 0
24 2MASS J20504608+4419100 TT* 20 50 46.0798533816 +44 19 09.956258832   19.284 17.230 15.972 14.586 ~ 6 0
25 UCAC4 672-086804 V* 20 50 46.0931880312 +44 21 17.357706792   16.962 15.786 15.085 14.440 ~ 1 0
26 2MASS J20504697+4417292 ** 20 50 46.97688 +44 17 29.2488   19.384 17.386 16.019 14.595 ~ 1 0
27 2MASS J20504858+4417033 TT* 20 50 48.58392 +44 17 03.3756   20.843 18.681 17.418 15.874 ~ 3 0
28 2MASS J20504858+4421045 TT* 20 50 48.5859538968 +44 21 04.571211888     19.716 18.147 16.507 ~ 5 0
29 2MASS J20504870+4420532 TT* 20 50 48.6961428432 +44 20 53.306201040   19.077 17.253 16.048 14.809 ~ 5 0
30 2MASS J20504880+4419233 TT* 20 50 48.7942268112 +44 19 23.434535892   19.280 17.635 16.315 14.893 ~ 5 0
31 2MASS J20505096+4423465 TT* 20 50 50.9609872872 +44 23 46.537145484   20.765 19.020 17.500 16.086 ~ 4 0
32 2MASS J20505165+4422198 V* 20 50 51.6615687120 +44 22 19.813353024   19.064 17.630 16.695 15.951 ~ 1 0
33 UCAC4 672-086810 V* 20 50 52.2928879752 +44 21 42.993617688   15.291 14.301 13.792 13.310 ~ 1 0
34 EM* LkHA 141 TT* 20 50 52.5700421112 +44 16 44.070163896   17.080 15.437 14.479 13.550 K4IVe 15 0
35 2MASS J20505317+4423535 TT* 20 50 53.1686003328 +44 23 53.533126428   20.337 18.337 16.841 15.152 ~ 6 0
36 2MASS J20505353+4424268 TT* 20 50 53.5412022312 +44 24 26.744685660     18.415 17.017 15.517 ~ 4 0
37 V* V1490 Cyg TT* 20 50 53.5829707800 +44 21 00.866003148   16.902 15.580 14.630 13.665 ~ 11 0
38 2MASS J20505363+4424305 TT* 20 50 53.6317750944 +44 24 30.476731212   20.386 18.242 16.692 15.221 ~ 4 0
39 2MASS J20505386+4421398 TT* 20 50 53.8596826080 +44 21 39.886582536       18.745 16.669 ~ 5 0
40 2MASS J20505429+4417526 TT* 20 50 54.2965301472 +44 17 52.636289856   19.459 17.943 16.677 15.334 ~ 5 0
41 2MASS J20505486+4420124 TT* 20 50 54.8643350568 +44 20 12.508594548     20.204 18.660 16.799 ~ 4 0
42 2MASS J20505489+4422583 TT* 20 50 54.8959982784 +44 22 58.273966128   19.540 18.076 16.886 15.704 ~ 4 0
43 2MASS J20505504+4424257 TT* 20 50 55.0305220248 +44 24 25.795897848       19.068 17.457 ~ 1 0
44 2MASS J20505543+4417461 TT* 20 50 55.4413917384 +44 17 45.986885376     18.679 17.374 15.866 ~ 1 0
45 UCAC4 672-086816 V* 20 50 55.5984693864 +44 21 12.301850520   16.115 14.758 13.863 12.921 ~ 1 0
46 EM* LkHA 144 TT* 20 50 55.63872 +44 17 50.2476   18.437 16.675 15.505 14.282 ~ 10 0
47 2MASS J20505575+4418286 TT* 20 50 55.7527576776 +44 18 28.664065836   20.843 18.814 17.302 15.490 ~ 1 0
48 UCAC4 672-086818 V* 20 50 56.0815062384 +44 21 54.387991728   14.953 14.174 13.768 13.326 ~ 1 0
49 UCAC4 672-086819 V* 20 50 56.1875283000 +44 21 08.986492800   16.827 14.831 13.597 12.395 ~ 1 0
50 UCAC4 672-086820 V* 20 50 56.3017796252 +44 19 26.313294040   14.748 13.821 13.305 12.787 ~ 2 0
51 2MASS J20505703+4416432 TT* 20 50 57.0339247824 +44 16 43.185890172         15.688 ~ 1 0
52 2MASS J20505747+4424456 TT* 20 50 57.47880 +44 24 45.6804   20.683 18.505 17.040 15.517 ~ 4 0
53 EM* LkHA 145 TT* 20 50 58.7050373576 +44 17 30.834288492   17.905 16.480 15.422 14.315 ~ 11 0
54 2MASS J20505875+4423174 TT* 20 50 58.7537471688 +44 23 17.457771372   20.781 19.140 17.646 16.238 ~ 4 0
55 2MASS J20505898+4415126 V* 20 50 58.9896127008 +44 15 12.588166800   19.397 17.496 16.223 14.914 ~ 1 0
56 2MASS J20505901+4419542 TT* 20 50 59.0134286232 +44 19 54.309974916   20.173 19.171 17.083 15.517 ~ 6 0
57 2MASS J20505948+4419390 TT* 20 50 59.4830649312 +44 19 39.070411608   20.560 18.585 17.256 15.825 ~ 5 0
58 IC 5070 HII 20 51.0 +44 22           ~ 200 1
59 2MASS J20510029+4424364 TT* 20 51 00.2979417936 +44 24 36.389454876     19.411 17.930   ~ 1 0
60 2MASS J20510146+4415344 TT* 20 51 01.4686559136 +44 15 34.466339808   19.253 17.227 16.036 14.826 ~ 4 0
61 EM* LkHA 146 TT* 20 51 01.5706495749 +44 15 42.040203471   17.514 15.951 15.046 13.905 K4IVe 16 0
62 2MASS J20510310+4424028 TT* 20 51 03.0984437616 +44 24 02.791473732   19.668 18.299 16.985 15.673 ~ 6 0
63 EM* LkHA 148 TT* 20 51 03.3358916352 +44 24 15.497949492   18.491 17.076 16.049 14.930 ~ 9 0
64 2MASS J20510443+4429180 TT* 20 51 04.4319623304 +44 29 17.986731828   21.145 18.957 17.522   ~ 1 0
65 EM* LkHA 149 TT* 20 51 04.6488903528 +44 23 50.138568600   16.383 15.154 14.207 13.219 K 20 0
66 V* V1492 Cyg TT* 20 51 05.7024709176 +44 16 32.277129060   17.319 15.550 14.490 13.492 ~ 7 0
67 UCAC4 672-086840 V* 20 51 06.1096926840 +44 17 57.667730388   17.458 16.052 15.202 14.327 ~ 1 0
68 UCAC4 672-086844 V* 20 51 06.9786092328 +44 23 56.265757296   16.451 15.385 14.832 14.329 ~ 1 0
69 2MASS J20510830+4416516 TT* 20 51 08.2985564040 +44 16 51.644607528     19.945 18.370 16.446 ~ 1 0
70 2MASS J20510854+4424331 TT* 20 51 08.5458287568 +44 24 33.100221456         16.627 ~ 3 0
71 2MASS J20510895+4416420 TT* 20 51 08.9550226176 +44 16 41.987503236   20.988 19.047 17.579 15.771 ~ 1 0
72 UCAC4 673-089708 V* 20 51 10.8444180192 +44 29 02.406646392   15.490 14.622 14.150   ~ 1 0
73 [BPH2019] V150 TT* 20 51 11.8188740424 +44 27 30.606568668         17.206 ~ 1 0
74 2MASS J20511209+4418477 TT* 20 51 12.0933746976 +44 18 47.730411900   20.371 18.712 17.297 15.626 ~ 3 0
75 2MASS J20511244+4419430 TT* 20 51 12.4412643912 +44 19 43.071726360     19.884 18.184 16.095 ~ 1 0
76 2MASS J20511252+4418093 TT* 20 51 12.5297960938 +44 18 09.260697251   20.071 18.162 16.995 15.829 ~ 2 0
77 2MASS J20511256+4427292 mul 20 51 12.56304 +44 27 29.2248       18.429   ~ 1 0
78 UCAC4 672-086850 V* 20 51 12.6202557528 +44 18 45.484404912   15.194 13.790 12.937 12.078 ~ 1 0
79 EM* LkHA 150 TT* 20 51 15.1371887777 +44 18 17.625727579   19.762 17.143 16.017 14.873 K3IVe 17 0
80 EM* LkHA 151 Em* 20 51 15.6420071247 +44 14 54.992984880   18.013 16.298 15.121 13.917 K6e 13 0
81 2MASS J20511606+4415000 TT* 20 51 16.0672440816 +44 15 00.052180992   19.566 17.926 16.619 15.337 ~ 9 0
82 EM* LkHA 152 TT* 20 51 16.5234875691 +44 22 58.027046511   17.252 15.847 14.952 14.107 K2IVe 14 0
83 2MASS J20511686+4420283 LP* 20 51 16.8590527680 +44 20 28.278022992       19.140 16.180 ~ 2 1
84 UCAC4 672-086854 V* 20 51 17.2391889528 +44 17 49.825986072   16.329 15.344 14.832 14.321 ~ 1 0
85 2MASS J20511771+4418298 TT* 20 51 17.7144947640 +44 18 29.878608060   20.233 17.790 16.529 15.213 ~ 4 0
86 2MASS J20511889+4415251 TT* 20 51 18.8997168480 +44 15 25.116886872       19.323 17.927 ~ 1 0
87 2MASS J20511945+4419306 TT* 20 51 19.4564693160 +44 19 30.595323936   20.115 18.285 17.085 16.014 ~ 5 0
88 2MASS J20511985+4423065 TT* 20 51 19.8452261808 +44 23 06.489166128   19.862 18.653 17.266 15.814 ~ 5 0
89 2MASS J20512059+4420322 TT* 20 51 20.5967012832 +44 20 32.292242088   19.710 17.842 16.489 14.913 ~ 1 0
90 EM* LkHA 153 TT* 20 51 20.9868711026 +44 26 19.584761756   17.545 15.852 14.768 13.619 K8IVe 21 0
91 2MASS J20512208+4419356 TT* 20 51 22.0878844032 +44 19 35.598575028   20.105 18.630 17.123 15.594 ~ 1 0
92 2MASS J20512245+4420465 TT* 20 51 22.4540948376 +44 20 46.535369244         16.861 ~ 4 0
93 EM* LkHA 154 TT* 20 51 22.6708769283 +44 21 07.627273307   17.995 16.907 15.753 14.651 K4IVe 16 0
94 UCAC4 673-089726 V* 20 51 24.3311970312 +44 24 56.000790504   13.48 12.46 12.32 11.505 ~ 1 0
95 2MASS J20512470+4418187 TT* 20 51 24.70824 +44 18 18.7704     19.010 17.504 15.801 ~ 4 0
96 2MASS J20512575+4428177 V* 20 51 25.7423048184 +44 28 17.777769096         18.102 ~ 1 0
97 2MASS J20512743+4429038 TT* 20 51 27.4268514120 +44 29 03.883184052         16.676 ~ 1 0
98 NGC 7000 Cl* 20 58 47 +44 19.8           ~ 388 0

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2022.12.07-07:23:44

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