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Titolo:
Diameters of delta Cephei and eta Aquilae measured with the Navy PrototypeOptical Interferometer
Autore:
Armstrong, JT; Nordgren, TE; Germain, ME; Hajian, AR; Hindsley, RB; Hummel, CA; Mozurkewich, D; Thessin, RN;
Indirizzi:
USN, Res Lab, Remote Sensing Div, Washington, DC 20375 USA USN WashingtonDC USA 20375 Remote Sensing Div, Washington, DC 20375 USA USN Observ, Astrometry Dept, Flagstaff, AZ 86002 USA USN Observ FlagstaffAZ USA 86002 strometry Dept, Flagstaff, AZ 86002 USA USN Observ, Astrometry Dept, Washington, DC 20392 USA USN Observ Washington DC USA 20392 rometry Dept, Washington, DC 20392 USA Thomas Jefferson High Sch Sci & Technol, Fairfax, VA USA Thomas Jefferson High Sch Sci & Technol Fairfax VA USA , Fairfax, VA USA
Titolo Testata:
ASTRONOMICAL JOURNAL
fascicolo: 1, volume: 121, anno: 2001,
pagine: 476 - 481
SICI:
0004-6256(200101)121:1<476:DODCAE>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
PERIOD-LUMINOSITY RELATION; FLUX METHOD IRFM; ANGULAR DIAMETERS; EFFECTIVE TEMPERATURES; MAGELLANIC-CLOUD; VARIABLES; PARAMETERS; RADIUS; STARS; LIGHT;
Keywords:
Cepheids; stars : individual (delta Cephei, eta Aquilae, beta Lacertae, 12 Aquilae); techniques : interferometric;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Armstrong, JT USN, Res Lab, Remote Sensing Div, 4555 Overlook Ave SW, Washington, DC 20375 USA USN 4555 Overlook Ave SW Washington DC USA 20375 C 20375 USA
Citazione:
J.T. Armstrong et al., "Diameters of delta Cephei and eta Aquilae measured with the Navy PrototypeOptical Interferometer", ASTRONOM J, 121(1), 2001, pp. 476-481

Abstract

We have measured the diameters of the Cepheid variables delta Cephei (18 nights) and eta Aquilae (11 nights) with the Navy Prototype Optical Interferometer. The primary results of these observations are the mean angular diameters [theta (LD)] of these Cepheids: 1.520 +/- 0.014 milliseconds of arc (mas) for delta Cep and 1.69 +/- 0.04 mas for eta Aql. We also report limb-darkened diameters for the check stars in this program: for beta Lac, theta (LD) = 1.909 +/- 0.022 mas and for 12 Aql, theta (LD) = 2.418 +/- 0.010 mas. When combined with radius estimates from period-radius relations in the literature, the Cepheid angular diameters suggest distances slightly smallerthan, but still consistent with, the Hipparcos distances. Pulsations are weakly detected at a level of similar to1.5 to 2 sigma for both Cepheids.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 04:48:59