2000ApJ...530..867W


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST16:00:56

2000ApJ...530..867W - Astrophys. J., 530, 867-874 (2000/February-3)

NICMOS narrowband infrared photometry of TW Hydrae association stars.

WEINTRAUB D.A., SAUMON D., KASTNER J.H. and FORVEILLE T.

Abstract (from CDS):

We have obtained 1.64, 1.90, and 2.15 µm narrowband images of five T Tauri stars in the TW Hya Association (TWA) using the Near-Infrared Camera and Multiobject Spectrometer aboard the Hubble Space Telescope. Most of the T Tauri stars in our study show evidence of absorption by H2O vapor in their atmospheres; in addition, the low-mass brown dwarf candidate, TWA 5B, is brighter at 1.9 µm than predicted by cool star models that include the effects of H2O vapor but neglect dust. We conclude that the effect of atmospheric dust on the opacity is important at 1.9 µm for TWA 5B, the coolest object in our sample. The available evidence suggests that the TWA is 5-15 Myr old. Comparison of the colors of TWA 5B with theoretical magnitudes as a function of age and mass then confirms previous claims that TWA 5B is substellar with a mass in the range 0.02-0.03 M. The accurate single-epoch astrometry of the relative positions and separation of TWA 5A and TWA 5B reported here should permit the direct measurement of the orbital motion of TWA 5B within only a few years.

Abstract Copyright:

Journal keyword(s): Infrared: Stars - open clusters and associations: individual (TW Hydrae) - Stars: Low-Mass, Brown Dwarfs - Stars: Pre-Main-Sequence

CDS comments: T. 1 : USNO 21 ? (not same coordinates as TWA 8)

Simbad objects: 17

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Number of rows : 17

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* BX Ant TT* 10 18 28.6989165716 -31 50 02.826261802   13.39 11.454 11.382 9.325 M0Ve 103 0
2 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1554 1
3 NAME TW Hya Association As* 11 01.9 -34 42           ~ 826 0
4 CD-29 8887 TT* 11 09 13.8074415397 -30 01 40.070212113   12.95 11.119 10.642 8.875 M2Ve 111 0
5 TWA 3B TT* 11 10 27.8410112470 -37 31 52.748874445   14.59 13.70   8.86 M4Ve 49 0
6 TWA 3 ** 11 10 27.894072 -37 31 51.96612   13.53 12.05 11.61 9.29 M4Ve+M4Ve 200 0
7 TWA 3A TT* 11 10 27.9117558304 -37 31 51.529219753   14.04 12.57   9.10 M4Ve 187 0
8 HD 98800 RS* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 333 0
9 CD-33 7795B LM* 11 31 55.2500 -34 36 25.200     20.40   15.8 M8.5/9e 118 0
10 CD-33 7795 TT* 11 31 55.2603055856 -34 36 27.214242128   12.97 11.524 11.150 9.150 M2Ve 176 0
11 CD-26 8623B TT* 11 32 41.1729967174 -26 52 09.110626414   16.70 15.22 13.68 11.76 M5.5 66 0
12 CD-26 8623 TT* 11 32 41.2659398509 -26 51 55.961617611   13.69 12.23 11.14 9.637 M3Ve 87 0
13 CD-36 7429B TT* 11 48 23.7347470027 -37 28 48.519698919   15.43 14.00   11.45 M1V 66 0
14 CD-36 7429A TT* 11 48 24.2226856081 -37 28 49.112368947   12.54 11.17 10.92 9.552 K5V 107 0
15 CD-36 7429 ** 11 48 24.22320 -37 28 49.1537           ~ 92 0
16 HD 109573B PM* 12 36 00.5493890939 -39 52 15.696207303         10.78 M2.5 74 0
17 HD 109573 PM* 12 36 01.0317721349 -39 52 10.222698506   5.786 5.774 7.25 5.81 A0V 559 1

    Equat.    Gal    SGal    Ecl

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2020.10.21-16:00:56

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