2001A&A...369..239G

Query : 2001A&A...369..239G

2001A&A...369..239G - Astronomy and Astrophysics, volume 369239-248 (2001/4-1)

Circumstellar medium around close southern PMS binaries. New results with the ESO ADONIS + COMIC/SHARP infrared system.

GEOFFRAY H. and MONIN J.-L.

Abstract (from CDS):

We have started a series of high angular resolution observations of close southern pre Main-Sequence (PMS) binary systems in order to study their respective photometry from 1 to 5 µm. For most of the binaries of our sample, we present the first near infrared (NIR) measurements longward of 3µm on both components. From these measurements we characterize the stellar Spectral Energy Distribution (SED) of the primary and its companion, adjust standard photospheres to estimate their luminosities & temperatures, hence masses & ages through the use of an HR diagram. At the same time, we study the presence of circumstellar material around our PMS targets, in order to assess how the eventually leftover material is distributed after contraction. We find the same proportion of mixed systems (CTTS/WTTS) as in the overall southern clouds and all these mixed systems are found with mass ratios <0.5; all the WTTS/WTTS systems of our sample are found in binaries closer than 60AU; apart from one of the most separated binaries, all our objects appear coeval.

Abstract Copyright: ∼

Journal keyword(s): stars: binaries: close - circumstellar matter - stars: formation - infrared: stars - instrumentation: adaptive optics - techniques: photometric

CDS comments: Table 1: col.5, DC 164.3+1.5 misprint for 264.3+1.5

Simbad objects: 22

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Number of rows : 22
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 DCld 264.3+01.5 DNe 08 54 42 -42 54.8           ~ 68 0
2 HD 76534 Be* 08 55 08.70673 -43 27 59.8852 7.04 7.62 7.50 8.94   B2Vn 142 0
3 RCW 34 HII 08 56 28.1 -43 05 58   10.5 11.21     ~ 99 0
4 V* V391 Vel Or* 08 56 28.109952 -43 05 55.40028 12.61 12.71 11.73 11.50   O8/8.5V 83 1
5 NAME TW Hya Association As* 11 01.9 -34 42           ~ 1018 0
6 CD-29 8887 TT* 11 09 13.7928873024 -30 01 39.968872752   12.95 11.119 10.642 8.875 M2Ve 141 0
7 TWA 3 ** 11 10 27.894072 -37 31 51.96612   13.53 12.05 11.61 9.29 M4Ve+M4Ve 218 0
8 TWA 3A TT* 11 10 27.9121410480 -37 31 51.535547940   14.04 12.57   9.10 M4Ve 221 0
9 NAME Cha II MoC 12 54 -77.2           ~ 361 0
10 V* BK Cha Or* 13 07 09.247848 -77 30 30.56004   16.11 14.58 14.41   K7 35 0
11 Lupus 1 Cld 15 43 02.1 -34 09 06           ~ 320 0
12 CD-33 10685 Or* 15 45 12.8678037432 -34 17 30.644403036 12.47 11.56 10.224 9.60 8.685 K3Ve 306 1
13 V* HO Lup Or* 16 07 00.603672 -39 02 19.49316   13.94 13.17 13.03   M1e 70 0
14 Lupus 3 SFR 16 09.6 -39 03           ~ 348 0
15 BD-18 4244 Or* 16 12 40.5144406080 -18 59 28.267620432   12.15 10.829   9.235 K0IV(e) 97 0
16 Haro 1-4 Or* 16 25 10.508136 -23 19 14.78820       13.15   K4e 78 0
17 CD-24 12689 Or* 16 27 40.2857881416 -24 22 04.130226300   12.91 11.533 11.11 10.00 K5e 301 0
18 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
19 EM* SR 13 Or* 16 28 45.2768168328 -24 28 18.905579112     13.60 12.40 10.9 M2e 142 0
20 NAME Scorpius Cloud MoC 16 29 00 -19 00.0           ~ 37 0
21 V* V653 Oph Mi* 18 38 43.4908863672 +11 02 56.928252696       12.32   ~ 12 0
22 V* V536 Aql Or* 19 38 57.413016 +10 30 15.99804     14.85 12.27   KV:e 64 0

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