2012ApJS..201...11K


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.30CET22:42:04

2012ApJS..201...11K - Astrophys. J., Suppl. Ser., 201, 11 (2012/August-0)

Mid-infrared spectral variability atlas of young stellar objects.

KOSPAL A., ABRAHAM P., ACOSTA-PULIDO J.A., DULLEMOND C.P., HENNING Th., KUN M., LEINERT Ch., MOOR A. and TURNER N.J.

Abstract (from CDS):

Optical and near-infrared variability is a well-known property of young stellar objects. However, a growing number of recent studies claim that a considerable fraction of them also exhibit mid-infrared flux changes. With the aim of studying and interpreting variability on a decadal timescale, here we present a mid-infrared spectral atlas containing observations of 68 low- and intermediate-mass young stellar objects. The atlas consists of 2.5-11.6 µm low-resolution spectra obtained with the ISOPHOT-S instrument on board the Infrared Space Observatory (ISO) between 1996 and 1998, as well as 5.2-14.5 µm low-resolution spectra obtained with the Infrared Spectrograph instrument on board the Spitzer Space Telescope between 2004 and 2007. The observations were retrieved from the ISO and Spitzer archives and were post-processed interactively by our own routines. For those 47 objects where multi-epoch spectra were available, we analyze mid-infrared spectral variability on annual and/or decadal timescales. We identify 37 variable candidate sources. Many stars show wavelength-independent flux changes, possibly due to variable accretion rates. In several systems, all exhibiting 10 µm silicate emission, the variability of the 6-8 µm continuum, and the silicate feature exhibit different amplitudes. A possible explanation is variable shadowing of the silicate-emitting region by an inner disk structure of changing height or extra silicate emission from dust clouds in the disk atmosphere. Our results suggest that mid-infrared variability, in particular, the wavelength-dependent changes, is more ubiquitous than was known before. Interpreting this variability is a new possibility for exploring the structure of the disk and its dynamical processes.

Abstract Copyright:

Journal keyword(s): circumstellar matter - infrared: stars - methods: data analysis - stars: pre-main sequence - techniques: spectroscopic

VizieR on-line data: <Available at CDS (J/ApJS/201/11): spectra.dat sp/*>

Simbad objects: 105

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Number of rows : 105

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* VX Cas Ae* 00 31 30.6816836826 +61 58 50.982831889 11.83 11.59 10.50 11.19 10.94 A0Vep 126 0
2 V* VY Cas LP* 00 51 26.0011824096 +62 55 14.874447782   10.94 9.62     M6/7III 53 0
3 IRAS 03260+3111 mul 03 29 10.4 +31 21 59           ~ 13 0
4 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1235 1
5 NAME [BM89] B5 DNe 03 47 38.3 +32 52 43           ~ 221 0
6 IRAS 03445+3242 Y*O 03 47 41.603 +32 51 43.79           ~ 174 0
7 LDN 1471 DNe 03 48.0 +32 54           ~ 283 0
8 IRAS 04016+2610 Y*O 04 04 43.07064 +26 18 56.3904           ~ 237 0
9 NAME T Tau Sb *i* 04 21 59.371 +19 32 05.95           M1 74 0
10 NAME T Tau S ** 04 21 59.371 +19 32 05.95           K7 144 2
11 NAME T Tau Sa *i* 04 21 59.371 +19 32 05.95           ~ 69 0
12 V* T Tau Or* 04 21 59.4323326335 +19 32 06.439974179   11.01 9.30 9.80   K0IV/Ve 1259 2
13 NAME T Tau N *i* 04 21 59.433 +19 32 06.42   11.22 10.12 9.80   K1.5 169 1
14 V* DG Tau Or* 04 27 04.6913654419 +26 06 16.041555299 13.57 13.97 10.50 12.28   K6Ve 942 1
15 V* GV Tau TT* 04 29 23.7314759229 +24 33 00.216016292 19.20         K7 273 2
16 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 817 0
17 V* HL Tau Or* 04 31 38.471952 +18 13 58.08504   15.89 14.49 14.39   K5 1231 0
18 IRAS 04287+1807 mul 04 31 38.8 +18 13 57           ~ 796 0
19 V* XZ Tau Or* 04 31 40.0868968022 +18 13 56.642439056     10.40 13.12   M2e+M2e 410 1
20 V* UZ Tau B TT* 04 32 42.82968 +25 52 31.4148   14.07 12.72 13.35   M1/3Ve 139 0
21 V* UZ Tau ** 04 32 43.02168 +25 52 30.9036           M4Ve+M1/3Ve 288 0
22 V* UZ Tau A TT* 04 32 43.0744163742 +25 52 31.022242441       13.15   M2.0e+M3.0e 90 0
23 V* VY Tau Or* 04 39 17.4208176970 +22 47 53.361809753     9.00     M0Ve 182 0
24 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3575 0
25 V* DR Tau Or* 04 47 06.2152696011 +16 58 42.814250257 12.03 11.86 10.50 12.19   K5Ve 478 0
26 V* AB Aur Ae* 04 55 45.8459978418 +30 33 04.293281305 7.20 7.16 7.05 6.96 6.70 A0Ve 943 2
27 HD 31648 Ae* 04 58 46.2654165113 +29 50 36.990341242 7.84 7.78 7.62 7.76 7.43 A5Vep 404 0
28 V* UX Ori Ae* 05 04 29.9881676817 -03 47 14.288047238 10.25 10.93 8.70 9.62 9.43 A4IVe 336 1
29 HD 34700 TT* 05 19 41.4088548858 +05 38 42.777125431 9.75 9.788 9.15 8.80 8.47 G0IVe 72 0
30 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2021 1
31 V* BF Ori Ae* 05 37 13.2623698298 -06 35 00.565420577 10.37 10.00 9.69 10.06 9.31 A7III 271 0
32 V* RR Tau Ae* 05 39 30.5114685049 +26 22 26.961204895 11.64 12.09 11.28 10.58 10.17 A0:IVe 216 0
33 JCMTSF J054027.4-072732 IR 05 40 27.4 -07 27 33           ~ 10 0
34 RAFGL 5163 Y*O 05 40 27.45024 -07 27 30.0564           ~ 126 1
35 V* V1647 Ori Or* 05 46 13.1370923766 -00 06 04.876812846     18.1     ~ 237 1
36 V* SX Cha Or* 10 55 59.802000 -77 24 40.12524   16.01 14.57 14.23 12.35 M1.5+M3 81 0
37 Hen 3-545 Or* 10 59 06.9712894449 -77 01 40.309036535   12.91 11.136   9.596 K4Ve 193 0
38 HD 95881 Em* 11 01 57.6212785173 -71 30 48.313329972   8.37 8.23     A0 89 0
39 V* CT Cha Or* 11 04 09.0989057683 -76 27 19.326914289   13.44 13.00   10.89 K7Ve 111 0
40 NAME Cha I MoC 11 06 48 -77 18.0           ~ 992 1
41 V* VW Cha Or* 11 08 01.3974165580 -77 42 28.579297348 13.91 14.04 12.80   10.69 K7+M0 169 0
42 HD 97048 Ae* 11 08 03.3105687971 -77 39 17.491180130 9.03 8.76 9.00   8.64 A0Vep 464 0
43 V* HP Cha Or* 11 08 15.216432 -77 33 53.17020   14.33 12.77 12.11   K3+G5e 100 0
44 V* HP Cha A * 11 08 15.4942983813 -77 33 53.454218639           K6e 81 0
45 NAME Cha IR Nebula TT* 11 08 38.702 -77 43 51.54           M5.5 72 0
46 V* VZ Cha Or* 11 09 23.7736314968 -76 23 20.855918834   13.82 12.94   12.14 K7e 127 0
47 HD 97300 Ae* 11 09 50.0178181814 -76 36 47.711452436   9.41 9.20   8.82 B9V 160 1
48 Ass Cha T 1-23 Or* 11 09 53.4191770981 -76 34 25.652662545   13.9 19.50 15.10 13.52 G9IIIe 81 0
49 V* WX Cha Or* 11 09 58.666944 -77 37 09.03432   14.93 13.85 14.23 12.20 M1+M5 91 0
50 V* WW Cha Or* 11 10 00.0791962314 -76 34 57.971855660   14.74 14.10   10.95 ~ 133 0
51 V* XX Cha Or* 11 11 39.6733333784 -76 20 15.037536625   16.67 15.28   12.56 M3Ve 99 1
52 V* CV Cha Or* 11 12 27.7052551478 -76 44 22.298597430   12.02 10.98 10.51 9.76 G9Ve 177 1
53 V* CW Cha Or* 11 12 30.9287857153 -76 44 24.000743749   15.75 14.45 15.19 13.60 ~ 55 1
54 HD 98300 * 11 18 13.9924763244 -28 26 04.366156928   8.83 7.71     K1III 4 0
55 HD 98800B SB* 11 22 05.288454 -24 46 39.04974   11.18 9.92     ~ 112 1
56 HD 98800 RS* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 333 0
57 HD 100453 Ae* 11 33 05.5765928993 -54 19 28.543792679   8.09 7.79     A9Ve 204 1
58 HD 100453B * 11 33 05.5767 -54 19 28.537     15.88     M4.0V 9 1
59 HD 100546 Be* 11 33 25.4404858122 -70 11 41.239343121   6.71 6.30   6.64 A0VaekB8_lB 659 1
60 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 699 0
61 [FLG2003] eps Cha 4 * 12 00 04.008 -78 11 36.96           K3V 12 0
62 V* DX Cha Ae* 12 00 05.0870448690 -78 11 34.559255151   6.81 6.60     A0_sh 310 0
63 [FLG2003] eps Cha 7 * 12 00 09.3133094261 -78 11 42.317079478           K3IV 17 0
64 V* DK Cha Or* 12 53 17.2028372976 -77 07 10.727661977           F0 132 0
65 CPD-36 6759 Y*O 15 15 48.4459023859 -37 09 16.026315179   9.21 8.708     F8V 366 1
66 HD 139614 pr* 15 40 46.3818973118 -42 29 53.538928508   8.47 8.24     A9VekA5mA5(_lB) 164 0
67 NAME HD 141569BC ** 15 49 57.34536 -03 55 10.9992         10.40 G0Ve 28 0
68 HD 141569 pr* 15 49 57.7484743862 -03 55 16.344023102 7.22 7.20 7.12 7.00 7.04 A2VekB9mB9(_lB) 476 0
69 HD 142666 TT* 15 56 40.0222941557 -22 01 40.004849949 9.41 9.37 8.82 8.31 8.01 F0V_sh 220 0
70 HD 142527 Ae* 15 56 41.8888096574 -42 19 23.245384377   9.04 8.34     F6III 486 1
71 * tet Dra SB* 16 01 53.3463580 +58 33 54.905636 4.630 4.520 4.000 3.56 3.31 F9V 277 0
72 HD 325367 Or* 16 03 05.4914377137 -40 18 25.426543472   11.40 8.50     M0 287 0
73 HD 144432 Ae* 16 06 57.9530266912 -27 43 09.758016578 8.47 8.53 8.19 7.82 7.53 A9/F0V 216 1
74 V* V856 Sco Ae* 16 08 34.2868591379 -39 06 18.326059778 7.66 7.41 7.05 6.92   A7IIIne_sh 355 0
75 WL 16 Y*O 16 27 02.33520 -24 37 27.2316           A0-F3 153 0
76 WL 6 Y*O 16 27 21.80448 -24 29 53.3616           ~ 113 0
77 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3086 0
78 HD 150193B TT* 16 40 17.865 -23 53 45.95           ~ 11 0
79 HD 150193 Be* 16 40 17.9242900066 -23 53 45.192676418 9.69 9.32 8.79 8.41   B9.5Ve 295 0
80 V* AK Sco Ae* 16 54 44.8497760618 -36 53 18.560813962 9.80 9.63 9.00     F5V 240 1
81 CD-42 11721 Be* 16 59 06.7622892572 -42 42 08.404916931 12.16 12.28 11.00     B0IVe 155 1
82 * c Oph Be* 17 31 24.9541340 -23 57 45.513592 4.75 4.81 4.81 4.74 4.72 A0V 256 0
83 HD 163296 Ae* 17 56 21.2882188601 -21 57 21.872343282 7.00 6.93 6.85 6.86 6.67 A1Vep 825 0
84 2MASS J18242929-2946559 TT* 18 24 29.2873835165 -29 46 56.621843224           ~ 4 1
85 HD 169142 Ae* 18 24 29.7799676975 -29 46 49.328597698   8.42 8.16     F1VekA3mA3_lB? 344 2
86 V* VV Ser Ae* 18 28 47.8619658319 +00 08 39.924642619 12.99 12.63 11.80 11.01 10.24 A5Ve 230 0
87 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 935 2
88 IRAS 18272+0114 Or* 18 29 49.13016 +01 16 20.6472           ~ 63 1
89 IRAS 18274+0112 Y*O 18 29 57.73680 +01 14 05.6940           M4: 136 2
90 NAME Serpens SVS 4 IR Cluster Cl* 18 29 57.84 +01 12 48.1           ~ 38 1
91 [EC92] 95 Y*O 18 29 57.893 +01 12 46.25           K1.0 71 3
92 CK 2 Y*O 18 30 00.618 +01 15 20.12           K5-M0III 52 0
93 V* S CrA Or* 19 01 08.597088 -36 57 19.89504   11.76 10.91 11.41   G0Ve+K0Ve 260 0
94 V* V709 CrA Or* 19 01 34.8590599569 -37 00 56.581106047   12.70 11.03     K1IV 57 0
95 NGC 6729 ISM 19 01 46.4 -36 57 40           ~ 54 0
96 V* V710 CrA Or* 19 01 50.67792 -36 58 09.6132           K7: 117 0
97 V* T CrA Ae* 19 01 58.7901571143 -36 57 50.329832417     11.67     F0 156 0
98 V* VV CrA Or* 19 03 06.7419790029 -37 12 49.683383133   16.45 14.67 14.12 11.62 K7 111 0
99 HD 181597 * 19 18 37.8722185239 +49 34 10.035499564   7.442 6.317     K1III 52 0
100 V* WW Vul Ae* 19 25 58.7494596284 +21 12 31.333220807 11.46 10.99 10.25 10.38 10.12 A2IVe 214 0
101 BD+40 4124 Ae* 20 20 28.2415737117 +41 21 51.527810947 11.11 11.36 10.62 10.510   B2Ve 276 1
102 EM* LkHA 224 Ae* 20 20 29.3500765489 +41 21 28.448014439 14.82 14.08 12.93 12.05 11.08 A4:Ve 91 0
103 * alf Cyg sg* 20 41 25.91514 +45 16 49.2197 1.11 1.34 1.25 1.14 1.04 A2Ia 720 0
104 V* PV Cep Or* 20 45 53.9537161790 +67 57 38.678052612   19.27 17.46 15.98 14.60 A5 255 3
105 V* SV Cep Ae* 22 21 33.2175224577 +73 40 27.096415978 11.40 11.25 10.35 10.28 10.08 A2IVe 123 0

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2020.11.30-22:42:04

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