2003A&A...397..675T


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.19CET16:14:29

2003A&A...397..675T - Astronomy and Astrophysics, volume 397, 675-691 (2003/1-2)

A spectro-astrometric study of southern pre-main sequence stars. Binaries, outflows, and disc structure down to AU scales.

TAKAMI M., BAILEY J. and CHRYSOSTOMOU A.

Abstract (from CDS):

We present spectro-astrometric observations for 28 southern pre-main sequence (PMS) stars and investigate their circumstellar environment down to AU scales. The structures detected in the ``position spectra'' include: (1) almost all the known binary companions in our sample (Sz 68, Sz 41, HO Lup, VW Cha, S CrA, AS 205), (2) companion candidates which have not been detected by infrared speckle techniques (T CrA, MWC 300), (3) monopolar and bipolar jets (AS 353A, CS Cha), (4) a combination of jets and a bow shock (VV CrA), and (5) a combination of a jet and stellar companion (R CrA).
Result. in known binaries show that this technique is capable of detecting binaries with separations down to ∼10 milliarcsec. Both components in each binary appear to have strikingly similar profiles in Hα emission, indicating a similarity of circumstellar activity (mass accretion and/or a wind), and supporting the scenario of core fragmentation for the mechanism of binary formation. The bipolar Hα jet in CS Cha has a spatial scale of ∼1.5AU, similar to that previously observed in RU Lup, and likely be heated by a mechanism other than shocks. From the spatial scale, velocity, and Hα luminosity, we estimate the mean hydrogen density in the AU-scale bipolar flows to be >107cm–3. The bipolar geometry in these jets can be explained by the presence of a disc gap/hole at AU scales, which could be induced by a gas-giant planet at the ice condensation radius.

Abstract Copyright:

Journal keyword(s): accretion, accretion discs - line: formation - line: profiles - stars: activity - stars: evolution - stars: pre-main-sequence

Errata: erratum vol. 401, p. 655 (2003)

Simbad objects: 41

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Number of rows : 41

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* DG Tau Or* 04 27 04.6913654419 +26 06 16.041555299 13.57 13.97 10.50 12.28   K6Ve 945 1
2 LDN 1521D DNe 04 27 46.5 +26 18 52           ~ 215 0
3 V* HK Tau Or* 04 31 50.5722969258 +24 24 17.775488652 16.81   15.10     M0.5 301 1
4 V* GK Tau Or* 04 33 34.5626781676 +24 21 05.854541262 15.50   13.00 12.02 10.62 K7:Ve 280 0
5 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3607 0
6 V* Z CMa Ae* 07 03 43.1588002461 -11 33 06.230351311 10.51 9.99 8.80     B5/8eq+F5/7 537 3
7 V* SZ Cha Or* 10 58 16.7496916561 -77 17 17.183339177     12.68   10.62 K0e 106 0
8 Hen 3-545 Or* 10 59 06.9712894449 -77 01 40.309036535   12.91 11.136   9.596 K4Ve 193 0
9 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1586 1
10 V* CS Cha Or* 11 02 24.8849252208 -77 33 35.683462615   12.88 11.69   10.123 K2Ve 201 0
11 V* CT Cha Or* 11 04 09.0989057683 -76 27 19.326914289   13.44 13.00   10.89 K7Ve 112 0
12 V* VW Cha Or* 11 08 01.3974165580 -77 42 28.579297348 13.91 14.04 12.80   10.69 K7+M0 169 0
13 HD 97048 Ae* 11 08 03.3105687971 -77 39 17.491180130 9.03 8.76 9.00   8.64 A0Vep 466 0
14 Sz 41 TT* 11 12 24.3971939698 -76 37 06.179976409   11.2 11.60   10.22 K7+M2.5 92 1
15 V* CV Cha Or* 11 12 27.7052551478 -76 44 22.298597430   12.02 10.98 10.51 9.76 G9Ve 177 1
16 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 703 0
17 Hen 3-854 Or* 13 05 20.6565859165 -77 39 01.505033200   13.88 12.40     K5 41 0
18 CD-33 10685 Or* 15 45 12.8670160093 -34 17 30.646921079 12.47 11.56 10.224 9.60 8.685 K3Ve 225 1
19 CD-35 10525 Or* 15 49 12.1055573607 -35 39 05.053991067 12.19 12.76 11.66 11.15   K7Ve 248 0
20 Sz 77 TT* 15 51 46.9579216483 -35 56 44.112995611   12.0       K5.5 55 0
21 THA 15-12 Or* 15 56 09.2067120748 -37 56 06.126159332   13.12 11.93 11.45   M0e 272 0
22 V* RU Lup Or* 15 56 42.3109948086 -37 49 15.473469159 9.27 10.07 9.60     K7/M0e 396 0
23 NAME Lup Cloud SFR 16 03 -38.1           ~ 544 0
24 V* HO Lup Or* 16 07 00.603672 -39 02 19.49316   13.94 13.17 13.03   M1e 62 0
25 V* V866 Sco Or* 16 11 31.345632 -18 38 25.96200   13.98 12.63 12.81   K0e+K5e 251 0
26 NAME Upper Sco Association As* 16 12 -23.4           ~ 1080 1
27 EM* SR 4 Or* 16 25 56.1659484606 -24 20 48.239269835     12.80 11.7 10.7 K0:Ve 157 1
28 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3111 1
29 EM* SR 20 Or* 16 28 32.6877046986 -24 22 45.009576300   16.23   12.59   G7 77 0
30 EM* AS 209 Or* 16 49 15.3035547820 -14 22 08.642015783   12.62 11.28     K4Ve 252 0
31 CD-24 13874 Ae* 18 05 49.7275038172 -24 15 20.733420769 11.74 12.12 11.29 10.91   B5:Vpe 44 0
32 HD 319139 BY* 18 14 10.4818974563 -32 47 34.516106830   11.47 10.68   9.11 K5+K7 302 0
33 V* VV Ser Ae* 18 28 47.8619658319 +00 08 39.924642619 12.99 12.63 11.80 11.01 10.24 A5Ve 231 0
34 EM* MWC 300 Ae* 18 29 25.6915000349 -06 04 37.289920628 12.55 12.67 13.795     B1Ia+[e] 129 0
35 V* S CrA Or* 19 01 08.597088 -36 57 19.89504   11.76 10.91 11.41   G0Ve+K0Ve 261 0
36 V* R CrA Ae* 19 01 53.6850227874 -36 57 08.145519972 12.781 12.651 11.917 11.242 10.412 B5IIIpe 456 1
37 V* T CrA Ae* 19 01 58.7901571143 -36 57 50.329832417     11.67     F0 157 0
38 V* VV CrA Or* 19 03 06.7419790029 -37 12 49.683383133   16.45 14.67 14.12 11.62 K7 111 0
39 NAME CrA Complex reg 19 15 00.0 -37 30 00           ~ 102 1
40 EM* AS 353 Or* 19 20 30.9919486938 +11 01 54.604157558   13.22 12.21     K5 184 1
41 HH 32C HH 19 20 31.3 +11 01 51           ~ 17 0

    Equat.    Gal    SGal    Ecl

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2021.01.19-16:14:29

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