2014MNRAS.437.2621B

Query : 2014MNRAS.437.2621B

2014MNRAS.437.2621B - Mon. Not. R. Astron. Soc., 437, 2621-2631 (2014/January-3)

Hα photometry of low-mass stars in 47 Tucanae: chromospheric activity and exotica.

BECCARI G., DE MARCHI G., PANAGIA N. and PASQUINI L.

Abstract (from CDS):

We have used archival Hubble Space Telescope observations obtained with the Advanced Camera for Surveys to study the Hα emission properties of main-sequence stars in the globular cluster 47 Tucanae. Using a combination of multiband observations in the F606W, F814W and F658N bands, we search for stars showing Hα excess emission. An accurate photometric measurement of their Hα equivalent width allows us to identify objects with large Hα emission, which we attribute to mass accretion rather than enhanced chromospheric activity. The spatial position of some of these stars is coincident with that of known X-ray sources, and their location in the colour-magnitude diagram allows us to classify them as active binaries or cataclysmic variables (CVs). We show that this method, commonly adopted to study accreting discs in young stellar objects, can be successfully used to identify and characterize candidate CVs.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): accretion, accretion discs - binaries: close - stars: chromospheres - globular clusters: individual: 47 Tucanae

Nomenclature: Table 2: [BDP2014] NN (Nos 1-59).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 25

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Number of rows : 25
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 CXOGlb J002353.9-720350 X 00 23 53.982 -72 03 50.07   14.28 13.07     ~ 18 0
2 CXOGlb J002354.5-720607 X 00 23 54.587 -72 06 07.84           ~ 3 0
3 CXOGlb J002356.3-720437 X 00 23 56.315 -72 04 37.37           ~ 2 0
4 CXOGlb J002358.7-720447 X 00 23 58.770 -72 04 47.45           ~ 2 0
5 CXOGlb J002400.5-720516 X 00 24 00.548 -72 05 16.88           ~ 2 0
6 CXOGlb J002400.7-720542 X 00 24 00.759 -72 05 42.66           ~ 2 0
7 CXOGlb J002400.9-720453 LXB 00 24 00.968 -72 04 53.18     21.7     ~ 59 0
8 CXOGlb J002401.7-720512 X 00 24 01.775 -72 05 12.30           ~ 4 0
9 [GHE2001] W305 X 00 24 02.043 -72 04 25.53           ~ 2 0
10 CXOGlb J002402.5-720511 CV* 00 24 02.533 -72 05 11.25           ~ 9 0
11 CXOGlb J002402.6-720441 X 00 24 02.658 -72 04 41.47           ~ 5 0
12 Cl* NGC 104 EGG V8 EB* 00 24 03.464 -72 05 05.20 19.195   18.383   17.541 ~ 11 0
13 CXOGlb J002403.6-720522 X 00 24 03.516 -72 05 22.54           ~ 4 0
14 CXOGlb J002403.7-720423 CV* 00 24 03.776 -72 04 22.96           ~ 9 0
15 CXOGlb J002403.8-720621 CV* 00 24 03.835 -72 06 21.61           ~ 7 0
16 RX J0021.8-7221 LXB 00 24 04.263 -72 04 57.97 18.868   19.772   19.316 ~ 78 0
17 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
18 Cl* NGC 104 MAM M54898 CV* 00 24 06.013 -72 04 56.20 19.383   20.411   19.273 ~ 33 0
19 CXOGlb J002407.1-720545 CV* 00 24 07.141 -72 05 45.67           ~ 16 0
20 CXOGlb J002407.8-720524 XB* 00 24 07.832 -72 05 24.38           ~ 5 0
21 CXOGlb J002410.5-720444 X 00 24 10.593 -72 04 44.18           ~ 2 0
22 Cl* NGC 104 AGBWF 4-2 XB* 00 24 12.017 -72 05 08.06 22.047   20.384   19.103 ~ 6 0
23 Cl* NGC 104 AGBWF 2-18 BY* 00 24 12.56 -72 04 23.6 19.184   18.312   17.376 ~ 6 0
24 Cl* NGC 104 AGBWF 3-4 XB* 00 24 18.609 -72 04 55.10 19.766   18.852   17.928 ~ 3 0
25 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0

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