2004AJ....127.2344J

Query : 2004AJ....127.2344J

2004AJ....127.2344J - Astron. J., 127, 2344-2351 (2004/April-0)

The history of the mysterious eclipses of KH 15D: Asiago observatory, 1967-1982.

JOHNSON J.A. and WINN J.N.

Abstract (from CDS):

We are gathering archival observations to determine the photometric history of the unique and unexplained eclipses of the pre-main-sequence star KH 15D. Here we present a light curve from 1967 to 1982, based on photographic plates from Asiago Observatory. During this time, the system alternated periodically between bright and faint states, as observed today. However, the bright state was 0.9 mag brighter than the modern value, and the fractional variation between bright and faint states (ΔI=0.7 mag) was smaller than observed today (3.5 mag). A possible explanation for these findings is that the system contains a second star that was previously blended with the eclipsing star but is now completely obscured.

Abstract Copyright: ∼

Journal keyword(s): Stars: Circumstellar Matter - Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 2264 - stars: individual (KH 15D) - Stars: Pre-Main-Sequence - Techniques: Photometric

Simbad objects: 57

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Number of rows : 57
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Cl* NGC 2264 FMS 113 * 06 40 38.0264282352 +09 32 49.217454276   18.93 17.35 16.37 15.41 M1 7 0
2 Cl* NGC 2264 FMS 122 TT* 06 40 38.7781971600 +09 21 38.323793160   16.39 15.429     K3 17 0
3 Cl* NGC 2264 FMS 128 * 06 40 39.2860779120 +09 21 01.769176584   16.824 15.784     ~ 3 0
4 NGC 2264 85 TT* 06 40 42.4450489464 +09 32 20.596018128 17.198 16.443 15.257 14.63 13.986 K4(e) 36 0
5 Cl* NGC 2264 VAS 60 * 06 40 42.7591273056 +09 23 49.055840772   14.901 14.236     G3 5 0
6 V* V598 Mon Or* 06 40 43.4272142520 +09 28 40.940841540 19.17 18.21 16.68 15.7 14.59 M0 45 0
7 Cl* NGC 2264 VAS 66 * 06 40 45.2049598224 +09 23 54.627241956   15.481 14.534     ~ 9 0
8 KHA 92 Em* 06 40 46.8279880080 +09 25 53.648885460 17.93 17.15 15.63 14.69 13.69 F4 12 0
9 Cl* NGC 2264 FMS 227 * 06 40 48.8728888872 +09 23 31.360984656   16.557 15.525   14.22 ~ 10 0
10 EM* LkHA 35 TT* 06 40 53.6366394552 +09 33 24.733235304 16.095 15.43 14.42 14.07 13.386 K1e 82 0
11 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
12 NGC 2264 120 PM* 06 40 55.4874274536 +09 31 21.818751024 16.83 15.72 14.23 13.34 12.48 ~ 23 0
13 V* OO Mon A Or* 06 40 56.7566022216 +09 30 15.201477756     15.99 14.95 13.65 ~ 16 0
14 V* OO Mon TT* 06 40 56.768544 +09 30 15.10812 18.46 17.54 15.93 14.84 13.50 M3V 37 0
15 V* OO Mon B * 06 40 56.8281295200 +09 30 14.390611704     16.06 14.99 13.69 ~ 19 0
16 Cl* NGC 2264 FMS 289 * 06 40 57.8263823064 +09 19 27.918835032   18.75 17.13 16.02 14.83 ~ 10 0
17 EM* LkHA 42 TT* 06 40 58.6712407104 +09 36 13.288007844   18.43 17.4 15.97 14.29 M4e 38 0
18 V* V421 Mon Or* 06 40 59.5468722264 +09 35 10.857042744 18.05 17.18 15.49 14.44 13.31 K4 58 0
19 V* V605 Mon Or* 06 41 01.4157826368 +09 34 08.183469000 16.75 15.85 14.66 13.97 13.30 K5 54 0
20 V* V781 Mon Or* 06 41 02.5373788080 +09 34 55.804829124 15.88 15.27 14.28 13.67 13.12 G7 53 0
21 NGC 2264 148 * 06 41 02.5892796984 +09 34 19.023183516 14.413 14.28 13.59   12.906 G5 15 0
22 Cl* NGC 2264 VAS 116 * 06 41 04.0217114376 +09 23 32.961198264   14.82 14.41     G3 24 0
23 V* LY Mon TT* 06 41 04.2833670727 +09 24 52.196452401 16.44 16.324 15.510 15.492 14.10 M0e 57 0
24 ESO-HA 479 TT* 06 41 04.5511532952 +09 25 18.323644836   18.76 17.25 16.09 14.46 M3.6 26 0
25 NGC 2264 162 TT* 06 41 05.7396734232 +09 31 01.201438344 17.59 16.94 15.44 14.58 13.55 K5e 48 0
26 EM* LkHA 55 TT* 06 41 06.4290543744 +09 28 38.841216132 18.71 18.49 17.29 16.16 15.10 M1.5e 40 0
27 V* V428 Mon Or* 06 41 07.3473339504 +09 25 55.010649756 17.32 16.58 15.24 14.42 13.50 K4e 48 0
28 V* LZ Mon TT* 06 41 08.8341683760 +09 23 43.070504028 17.11 16.26 14.79 14.06 13.13 K4V 38 0
29 V* OR Mon TT* 06 41 09.092352 +09 30 09.07524 18.311 17.797 16.407 15.49 14.404 K7e 45 0
30 HD 47887 Y*O 06 41 09.5990050152 +09 27 57.538520712 6.01 6.96 7.14   7.40 B0.7V 112 0
31 V* V818 Mon TT* 06 41 09.8294481912 +09 27 12.239212716   15.74 14.50 13.67 12.85 K5e 46 0
32 V* V582 Mon TT* 06 41 10.3403165544 +09 28 33.487425336   17.404   17.21 16.45 K5e 206 0
33 V* OS Mon TT* 06 41 13.3333730136 +09 28 07.463432460   17.57 16.32 15.43 14.60 K5e 54 0
34 NGC 2264 191 Or* 06 41 14.4638869224 +09 33 21.422602512 17.92 16.83 15.45 14.66 13.75 K5e 58 0
35 Cl* NGC 2264 SBL 336 TT* 06 41 14.8402203576 +09 32 35.854366776 20.085 18.67 16.81 15.74 14.20 M3e 46 0
36 V* MN Mon TT* 06 41 16.7841879888 +09 27 30.211272648 16.38 16.36 15.34 14.59 13.91 K4 61 0
37 V* OU Mon Or* 06 41 17.7099188232 +09 29 26.207773872 18.36 17.35 15.74 14.71 13.51 M3e 43 0
38 NGC 2264 198 Or* 06 41 17.9267647776 +09 33 37.020133440 17.69 16.76 15.46 14.65 13.78 M0 47 0
39 EM* LkHA 68 TT* 06 41 18.2761562688 +09 33 53.577015984 16.3 16.05 14.92 14.18 13.51 K4 68 0
40 V* PX Mon TT* 06 41 19.1161022592 +09 26 29.470312644 18.48 18.56 17.34 16.25 15.05 M3 43 0
41 Cl* NGC 2264 FMS 432 TT* 06 41 19.3840265640 +09 21 46.985125680   16.307 15.385     K2 17 0
42 NGC 2264 454 TT* 06 41 19.4545613856 +09 30 28.630525140 15.51 14.84 13.9 13.4 12.96 K5 28 0
43 NGC 2264 455 TT* 06 41 19.6321805568 +09 31 44.374946520 16.68 15.71 14.45 13.74 12.98 K4V 49 0
44 V* OV Mon TT* 06 41 21.0106191456 +09 33 36.091832724 16.93 16.43 15.16 14.38 13.56 K6e 64 0
45 IRAS 06385+0924 TT* 06 41 22.1443554600 +09 21 31.114827000 18.47 18.43 16.76 15.67 14.25 ~ 25 0
46 Cl* NGC 2264 VAS 163 Y*O 06 41 22.5366100752 +09 29 12.942526956 16.18 15.08 13.9 13.22 12.65 K4 18 0
47 Cl* NGC 2264 SBL 368 TT* 06 41 24.2543488512 +09 31 54.152351112 17.79 16.75 15.42 14.62 13.61 M0 41 0
48 Cl* NGC 2264 VAS 166 * 06 41 24.3926981184 +09 21 39.001444524 13.9 13.93 13.32 13 12.58 ~ 8 0
49 Cl* NGC 2264 SBL 369 TT* 06 41 24.4534092072 +09 32 45.157710228 19.05 18.24 16.66 15.25 14.15 M5e 42 0
50 NGC 2264 210 TT* 06 41 24.7296249960 +09 26 23.481903372 14.57 14.27 13.43 12.91 12.62 G7 26 0
51 V* V978 Mon RS* 06 41 27.1549351536 +09 35 06.147201804 16.06 15.37 14.35 13.73 13.16 K1 48 0
52 Cl* NGC 2264 FMS 462 TT* 06 41 27.56376 +09 31 55.8336 17.45 16.25 14.92 14.12 13.45 K4 20 0
53 Cl* NGC 2264 VAS 171 * 06 41 27.9371939160 +09 21 39.611668860   14.07 13.442     ~ 4 0
54 Cl* NGC 2264 VAS 186 El* 06 41 36.8301091320 +09 27 05.653843956 16.85 15.9 14.69 14.02 13.38 K6 14 0
55 Cl* NGC 2264 VAS 195 * 06 41 42.4896448224 +09 28 02.150542416   15.11 14.36     G7 5 0
56 V* V371 Mon Or* 06 41 44.3340852120 +09 22 38.113207536   16.34 15.31 14.87   ~ 3 0
57 Cl* NGC 2264 VAS 201 * 06 41 45.9789527112 +09 23 50.459271540   13.88 13.32     ~ 10 0

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