2008A&A...491..829K


Query : 2008A&A...491..829K

2008A&A...491..829K - Astronomy and Astrophysics, volume 491, 829-831 (2008/12-1)

Identification of the TW Hydrae association member 2M1235-39: a tertiary component of the HR 4796 system.

KASTNER J.H., ZUCKERMAN B. and BESSELL M.

Abstract (from CDS):

We seek to determine whether the late-type star 2MASS J12354893-3950245 (2M1235-39) is a member of the TW Hya Association (TWA), a hypothesis suggested by its association with a bright X-ray source detected serendipitously by ROSAT and XMM-Newton and its (∼3') proximity to the well-studied (A+M binary) system HR 4796. We used optical spectroscopy to establish the Li and Hα line strengths of 2M1235-39, and determined its proper motion via optical imaging. We also considered its X-ray and near-IR fluxes relative to the M star HR 4796B. The optical spectrum of 2M1235-39 displays strong Li absorption and Hα emission (equivalent widths of 630mÅ and -6.7Å, respectively). Comparison of the spectrum with that of a nearby field star, along with the DENIS catalog IJK magnitudes, indicates the spectral type of 2M1235-39 is M4.5. We measure a proper motion for 2M1235-39 that agrees, within the errors, with that of HR 4796. The Li absorption and Hα emission line strengths of 2M1235-39, its near-IR and X-ray fluxes, and its proper motion all indicate that 2M1235-39 is a TWA member. Most likely this star is a wide (13500AU) separation, low-mass, tertiary component of the HR 4796 system.

Abstract Copyright:

Journal keyword(s): stars: individual: 2M1235-39 - stars: pre-main sequence - stars: individual: HR 4796

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1781 1
2 * alf Car * 06 23 57.10988 -52 41 44.3810 -0.49 -0.59 -0.74 -0.96 -1.13 A9II 435 0
3 * eta Cha * 08 41 19.5125857944 -78 57 48.105898056 5.02 5.351 5.453     B8V 219 0
4 NAME eta Cha Association OpC 08 42 33 -78 57.8           ~ 336 0
5 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 1735 1
6 NAME TW Hya Association As* 11 01.9 -34 42           ~ 884 0
7 TWA 11C Y*? 12 35 48.9396090720 -39 50 24.567159768   15.94 14.43 14.07   ~ 29 0
8 HD 109573 PM* 12 36 01.0317461592 -39 52 10.220465388   5.786 5.774 7.25 5.81 A0V 589 1
9 UCAC2 14824643 * 12 36 04.5813562392 -39 51 56.700779688   13.07 12.55 12.42   ~ 1 0
10 L 471-42 PM* 12 38 49.0984129478 -38 22 53.670422368   14.43 12.74 12.473   M4.0V 51 0

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2022.05.22-01:15:42

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