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Titolo:
DIRECT CONFIRMATION OF STELLAR LIMB DARKENING WITH THE NAVY PROTOTYPEOPTICAL INTERFEROMETER
Autore:
HAJIAN AR; ARMSTRONG JT; HUMMEL CA; BENSON JA; MOZURKEWICH D; PAULS TA; HUTTER DJ; ELIAS NM; JOHNSTON KJ; RICKARD LJ; WHITE NM;
Indirizzi:
USN OBSERV,3450 MASSACHUSETTS AVE NW WASHINGTON DC 20392 USN,REMOTE SENSING DIV,RES LAB WASHINGTON DC 20375 UNIV SPACE RES ASSOC WASHINGTON DC 20024 USN OBSERV,FLAGSTAFF STN FLAGSTAFF AZ 86002 LOWELL OBSERV FLAGSTAFF AZ 86001
Titolo Testata:
The Astrophysical journal
fascicolo: 1, volume: 496, anno: 1998,
parte:, 1
pagine: 484 - 489
SICI:
0004-637X(1998)496:1<484:DCOSLD>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANGULAR DIAMETER MEASUREMENTS; STARS;
Keywords:
STARS, FUNDAMENTAL PARAMETERS; TECHNIQUES, INTERFEROMETRIC;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
A.R. Hajian et al., "DIRECT CONFIRMATION OF STELLAR LIMB DARKENING WITH THE NAVY PROTOTYPEOPTICAL INTERFEROMETER", The Astrophysical journal, 496(1), 1998, pp. 484-489

Abstract

Using three elements of the Navy Prototype Optical Interferometer andobserving in 20 spectral channels covering 520-850 nm, we have implemented a phase bootstrapping technique in which short baselines with high visibilities are used to keep the longer baselines with low visibilities in phase. Using this method, we have been able to extend the spatial frequency coverage beyond the first zero of the stellar visibility function for two K giants alpha Arietis, and alpha Cassiopeiae. The data are inconsistent with a uniform-disk model and confirm the presence of limb-darkened radial profiles. Adopting a particular limb-darkening law enables us to determine the diameter with small formal errors (one part in 1000). In addition, we have measured closure phases for both stars. The closure phases show a jump of 180 degrees at the first zero in the visibility amplitude, which was expected.

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Documento generato il 25/11/20 alle ore 04:35:42