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Titolo:
SX phoenicis stars in the core of 47 Tucanae
Autore:
Bruntt, H; Frandsen, S; Gilliland, RL; Christensen-Dalsgaard, J; Petersen, JO; Guhathakurta, P; Edmonds, PD; Bono, G;
Indirizzi:
Aarhus Univ, Inst Fys & Astron, DK-8000 Aarhus C, Denmark Aarhus Univ Aarhus Denmark C nst Fys & Astron, DK-8000 Aarhus C, Denmark Space Telescope Sci Inst, Baltimore, MD 21218 USA Space Telescope Sci Inst Baltimore MD USA 21218 , Baltimore, MD 21218 USA Aarhus Univ, Danmarks Grundforskningsfond, Teoret Astrofys Ctr, DK-8000 Aarhus C, Denmark Aarhus Univ Aarhus Denmark C ret Astrofys Ctr, DK-8000 Aarhus C, Denmark Niels Bohr Inst Astron Fys & Geofys, Astron Observ, DK-2100 Copenhagen O, Denmark Niels Bohr Inst Astron Fys & Geofys Copenhagen Denmark O agen O, Denmark Univ Calif Santa Cruz, Univ Calif Observ, Lick Observ, Santa Cruz, CA 95064 USA Univ Calif Santa Cruz Santa Cruz CA USA 95064 v, Santa Cruz, CA 95064 USA Ctr Astrophys, Cambridge, MA 02138 USA Ctr Astrophys Cambridge MA USA 02138 r Astrophys, Cambridge, MA 02138 USA Osservatorio Astron Roma, I-00040 Monte Porzio Catone, Italy Osservatorio Astron Roma Monte Porzio Catone Italy I-00040 Catone, Italy European So Observ, Santiago 19, Chile European So Observ Santiago Chile19 opean So Observ, Santiago 19, Chile
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 2, volume: 371, anno: 2001,
pagine: 614 - 625
SICI:
1432-0746(200105)371:2<614:SPSITC>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUBBLE-SPACE-TELESCOPE; DELTA-SCUTI VARIABLES; 3-DIMENSIONAL HYDRODYNAMICAL SIMULATIONS; GLOBULAR-CLUSTER PHOTOMETRY; MAIN-SEQUENCE STARS; BLUE STRAGGLERS; PULSATION MODELS; CCD PHOTOMETRY; CENTRAL REGION; 47-TUCANAE;
Keywords:
techniques : photometric; stars : blue stragglers; stars : variable : delta set; stars : individual : 47 Tuc;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Bruntt, H Aarhus Univ, Inst Fys & Astron, DK-8000 Aarhus C, Denmark AarhusUniv Aarhus Denmark C Astron, DK-8000 Aarhus C, Denmark
Citazione:
H. Bruntt et al., "SX phoenicis stars in the core of 47 Tucanae", ASTRON ASTR, 371(2), 2001, pp. 614-625

Abstract

We present new results on five of six known SX Phoenicis stars in the coreof 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 bycomparing 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 curvesof 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%.

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Documento generato il 29/09/20 alle ore 09:16:36