2001A&A...371..614B


Query : 2001A&A...371..614B

2001A&A...371..614B - Astronomy and Astrophysics, volume 371, 614-625 (2001/5-4)

SX Phoenicis stars in the core of 47 Tucanae.

BRUNTT H., FRANDSEN S., GILLILAND R.L., CHRISTENSEN-DALSGAARD J., PETERSEN J.O., GUHATHAKURTA P., EDMONDS P.D. and BONO G.

Abstract (from CDS):

We present new results on five of six known SX Phoenicis stars in the core of the globular cluster 47 Tucanae. We give interpretations of the light curves in the V and I bands from 8.3 days of observations with the Hubble Space Telescope near the core of 47 Tuc. The most evolved SX Phe star in the cluster is a double-mode pulsator (V2) and we determine its mass to be (1.54±0.05)M from its position in the Hertzsprung-Russell diagram and by comparing observed periods with current theoretical pulsation models. For V14 we do not detect any pulsation signal. For the double-mode pulsators V3, V15, and V16 we cannot give a safe identification of the modes. We also describe the photometric techniques we have used to extract the light curves of stars in the crowded core. Some of the SX Phoenicis are saturated and we demonstrate that even for stars that show signs of a bleeding signal we can obtain a point-to-point accuracy of 1-3%.

Abstract Copyright:

Journal keyword(s): techniques: photometric - stars: blue stragglers - stars: variable: δ set - stars: individual: 47 Tuc

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 Cl* NGC 104 EGG V14 BS* 00 24 05 -72 04.8 16.59 16.797 16.456     ~ 5 0
2 Cl* NGC 104 EGG V16 SX* 00 24 05 -72 04.8 16.03 16.01 15.76   15.38 ~ 6 0
3 Cl* NGC 104 EGG V15 SX* 00 24 05 -72 04.8 15.71 15.42 15.28   15.04 ~ 6 0
4 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3737 0
5 Cl* NGC 104 DPF 1758 SX* 00 24 06.606 -72 04 49.47 16.13 16.25 15.93   15.55 ~ 12 0
6 Cl* NGC 104 EGG V2 SX* 00 24 09.145 -72 05 04.30 15.78 15.46 15.07   14.64 ~ 10 0
7 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3252 0
8 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1879 0
9 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1885 1
10 V* SX Phe SX* 23 46 32.8928138474 -41 34 54.769886474   7.40 7.12     A3V 323 0

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2022.08.16-06:13:38

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