2008A&A...488..997K


Query : 2008A&A...488..997K

2008A&A...488..997K - Astronomy and Astrophysics, volume 488, 997-1006 (2008/9-4)

Multiplicity of young stars in and around R Coronae Australis.

KOEHLER R., NEUHAEUSER R., KRAEMER S., LEINERT C., OTT T. and ECKART A.

Abstract (from CDS):

In star-forming regions like Taurus-Auriga, it has been found that most young stars are born as multiples, which theories of star formation should definitely take into account. The R CrA star-forming region has a small dark cloud with quite a number of protostars, T Tauri stars, and some Herbig Ae/Be stars, plus a number of weak-line T Tauri stars around the cloud found by ROSAT follow-up observations. We would like to detect multiples among the young stars in and around the R CrA cloud in order to investigate multiplicity in this region. We performed interferometric and imaging observations with the speckle camera SHARP I at the ESO 3.5m NTT and adaptive optics observation with ADONIS at the ESO 3.6m telescope, all in the near-infrared bands JHK obtained in the years 1995, 2000, and 2001. We found 13 new binaries among the young stars in CrA between 0.13arcsec (the diffraction limit) and 6 arcsec (set as an upper separation limit to avoid contamination by chance alignments). While most multiples in CrA are binaries, there are also one quadruple (TY CrA), and one triple (HR 7170) which may form a quintuple together with the binary HR 7169. One of the newly detected companions with a large magnitude difference found near the M3-5 type T Tauri star [MR 81] Hα 17 could be a brown dwarf or an infrared companion with an edge-on disk. Among seven Herbig Ae/Be stars in CrA, six are multiple. The multiplicity frequency in CrA is as high as in similar star forming regions. By comparing with the period distribution of main-sequence stars and extrapolating to separations not probed in this survey, we conclude that the companion-star frequency is (95±23)%; i.e. the average number of companions per primary is 0.95.

Abstract Copyright:

Journal keyword(s): stars: pre-main-sequence - stars: binaries: close - infrared: stars - instrumentation: high angular resolution - surveys

Nomenclature: Fig. 3: [MR81] HA 17 WW (Nos NE, SW).

Simbad objects: 65

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Number of rows : 65
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1359 0
2 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1621 1
3 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 808 0
4 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1332 1
5 NAME Sco-Oph Region reg 16 30.0 -21 00           ~ 74 0
6 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14463 0
7 2MASS J18363954-3451257 Y*O 18 36 39.5471369520 -34 51 25.717609764   14.3 13.0     ~ 6 0
8 CD-37 12759 TT* 18 39 05.2883583096 -37 26 21.824393172   11.96 10.98     K1 17 0
9 2MASS J18405271-3546410 Y*O 18 40 52.7082285000 -35 46 41.038497300   15.1 14.2     ~ 6 0
10 CD-35 12836 TT* 18 41 48.5620563576 -35 25 43.665854160   10.59 9.85   8.963 G7V 17 0
11 WRAY 15-1880 TT* 18 42 57.9813628512 -35 32 42.826760736   12.91 11.77     K2 50 0
12 2MASS J18442192-3541435 Y*? 18 44 21.9261853368 -35 41 43.444975632     11.3     K5 15 0
13 RX J1844.5-3723 Ro* 18 44 31.1662574784 -37 23 34.795924044         11.398 ~ 8 0
14 HD 173148 ** 18 45 34.827192 -37 50 19.76604   9.82 9.29 9.51 8.220 G7IV 19 0
15 CD-36 12989 Ro* 18 46 45.8513508216 -36 36 16.361353692   12.07 10.94 10.97 9.582 ~ 6 1
16 IRAS 18489-3703 TT* 18 52 17.3013456504 -37 00 11.948920920   12.7 12.194   10.842 K7V 51 0
17 HD 174656 ** 18 53 05.977488 -36 10 22.76616   10.57 9.80 9.79 8.643 K0IV(e) 22 0
18 GSC 07916-00050 * 18 55 11.9942691144 -37 53 51.648322704   13.8 13.2     K3 5 0
19 2MASS J18564400-3545321 Y*? 18 56 44.0081249256 -35 45 32.294279232           ~ 5 0
20 GSC 07421-00665 PM* 18 57 17.9937437592 -36 42 36.098220924   14.73 13.35     ~ 6 0
21 CD-36 13163 TT* 18 57 20.8422617712 -36 43 00.643933128   11.77 11.16     G5IV 13 0
22 2MASS J18573418-3732332 Y*? 18 57 34.2124405920 -37 32 33.226676628     14.87     ~ 5 1
23 2MASS J18574512-3719378 TT* 18 57 45.1288946208 -37 19 37.779409524   16.0 15.2     ~ 7 0
24 RX J185802.3-365348 TT* 18 58 01.8228923880 -36 53 45.264989904   13.40 12.26 12.04   K5IV 11 0
25 HBC 673 Em* 18 58 51.8352291792 -37 19 22.781982360     14.57     K 10 0
26 2MASS J18585650-3640297 TT* 18 58 56.5094550768 -36 40 29.723482956   13.2 12.8     ~ 8 0
27 2MASS J18591487-3711317 Em* 18 59 14.87 -37 11 31.7   16.2 16.4     ~ 10 0
28 2MASS J18594100-3656011 TT* 18 59 41.0005369656 -36 56 01.302599688   14.8 13.9     ~ 6 0
29 2MASSW J1858509-370631 Y*O 18 59 50.9461096368 -37 06 31.493373948           ~ 16 1
30 2MASS J19000157-3637054 TT* 19 00 01.5743588376 -36 37 05.510254656   15.19 13.93     Me 24 0
31 2MASS J19000169-3627576 TT* 19 00 01.6918258056 -36 27 57.638827764   15.8 14.9     ~ 8 0
32 2MASS J19002906-3656036 Y*O 19 00 29.0664050280 -36 56 03.604851096   17.15 15.68 13.78   M4 20 0
33 2MASS J19003930-3648121 Y*O 19 00 39.3001458672 -36 48 12.250459152   17.53 15.88     M2V 13 0
34 2MASS J19004530-3711480 Y*O 19 00 45.3133188192 -37 11 48.090886404           M8.5 9 1
35 2MASS J19005974-3647109 Y*O 19 00 59.7440317608 -36 47 11.070032568           ~ 14 0
36 HD 176269 Y*O 19 01 03.2540527320 -37 03 39.303126756   6.54 6.69     B9V 65 0
37 HD 176270 Y*O 19 01 04.3028373864 -37 03 41.666365152   6.37 6.40     B9V 59 0
38 HBC 675 Em* 19 01 06.9134407680 -36 58 07.380302916   15.87 13.94     ~ 17 0
39 V* S CrA Or* 19 01 08.597088 -36 57 19.89504   11.76 10.91 11.41   G0Ve+K0Ve 270 0
40 2MASS J19010971-3647528 TT* 19 01 09.7113657912 -36 47 52.880980812   14.35 12.74 12.0   ~ 15 0
41 2MASS J19012717-3659085 TT* 19 01 27.1758555480 -36 59 08.597796900   18.3 16.9     M 17 0
42 HD 176383 TT* 19 01 28.6719304584 -34 22 35.567440824   8.75 8.24     F5V 31 0
43 2MASS J19013357-3700304 Y*O 19 01 33.5761986624 -37 00 30.453110028           M6.5 45 0
44 V* V709 CrA Or* 19 01 34.8589591776 -37 00 56.579123412   12.70 11.03     K1IV 63 0
45 HD 176386 Y*O 19 01 38.9318002416 -36 53 26.561166432 7.28 7.44 7.32 8.11   B9Vbs 136 0
46 2MASS J19014055-3644320 TT* 19 01 40.56 -36 44 32.0           ~ 8 0
47 V* TY CrA Ae* 19 01 40.8284458320 -36 52 33.816176040 10.03 9.92 9.39     B9e 285 0
48 2MASS J19014164-3659528 Y*O 19 01 41.6426330712 -36 59 52.868573844   17.7 16.7     M2 32 0
49 2MASS J19014791-3659302 Y*O 19 01 47.92 -36 59 30.3           ~ 16 0
50 UCAC4 265-183516 Y*O 19 01 49.3660476264 -37 00 28.636309008   18.4   16.6   M4.0 13 0
51 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 490 0
52 V* R CrA Ae* 19 01 53.6764322232 -36 57 08.299341828 12.781 12.651 11.917 11.242 10.412 B5IIIpe 478 1
53 V* DG CrA Or* 19 01 55.2443229672 -37 23 40.847210448     13.40     K5.0 38 0
54 V* T CrA Ae* 19 01 58.7902764120 -36 57 50.339720880     11.67     F0 167 0
55 2MASS J19020012-3702220 TT* 19 02 00.1219249728 -37 02 22.132961880   17.0 16.1     M4 16 0
56 V* V702 CrA Or* 19 02 01.9776932592 -37 07 43.519646568   11.28 10.512   9.512 G5e 43 0
57 2MASS J19022213-3655409 TT* 19 02 22.1300594952 -36 55 40.964075976   15.17 13.72 12.5   K2IV 39 0
58 2MASS J19022708-3658132 TT* 19 02 27.1008912432 -36 58 13.677942828   15.60 13.59 12.5   M1.9 37 0
59 V* VV CrA Or* 19 03 06.7410913704 -37 12 49.686912432   16.45 14.67 14.12 11.62 K7 119 0
60 2MASS J19041725-3659030 TT* 19 04 17.2604342496 -36 59 03.475376988   17.8 16.8     ~ 10 0
61 HD 177076 Y*O 19 04 44.4144452256 -36 50 40.971078168   8.28 8.12     A0V 24 0
62 V* V721 CrA Or* 19 09 45.9196932624 -37 04 26.179922172   14.92 13.30     K6IVe 28 0
63 [MR81] HA 17 TT* 19 10 43.3789302408 -36 59 09.345472548   18.1 16.9     ~ 12 0
64 CD-38 13398 TT* 19 17 23.8181700744 -37 56 50.448912972   11.02 10.074   8.913 K0IVe 21 0
65 NAME R CrA Association As* ~ ~           ~ 20 0

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