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Titolo:
Astrophysical quantities of Cepheid variables measured with the navy prototype optical interferometer
Autore:
Nordgren, TE; Armstrong, JT; Germain, ME; Hindsley, RB; Hajian, AR; Sudol, JJ; Hummel, CA;
Indirizzi:
USN Observ, Astrometry Dept, NPOI, Flagstaff, AZ USA USN Observ FlagstaffAZ USA rv, Astrometry Dept, NPOI, Flagstaff, AZ USA 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, Washington, DC 20392 USA USN Observ Washington DC USA 20392 rometry Dept, Washington, DC 20392 USA
Titolo Testata:
ASTROPHYSICAL JOURNAL
fascicolo: 2, volume: 543, anno: 2000,
parte:, 1
pagine: 972 - 978
SICI:
0004-637X(20001110)543:2<972:AQOCVM>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
PERIOD-RADIUS RELATION; VISUAL SURFACE BRIGHTNESS; CLASSICAL CEPHEIDS; POLARIS; CONFIRMATION; AMPLITUDE; MASSES;
Keywords:
Cepheids; stars : fundamental parameters; stars : individual (delta Cephei, eta Aquilae, Polaris, zeta Geminorum); techniques : interferometric;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Nordgren, TE USN Observ, Astrometry Dept, NPOI, POB 1149, Flagstaff, AZ USA USN Observ POB 1149 Flagstaff AZ USA 1149, Flagstaff, AZ USA
Citazione:
T.E. Nordgren et al., "Astrophysical quantities of Cepheid variables measured with the navy prototype optical interferometer", ASTROPHYS J, 543(2), 2000, pp. 972-978

Abstract

We present mean angular diameters for two Cepheid variables, alpha UMi andzeta Gem, determined with the Navy Prototype Optical Interferometer (NPOI). We present linear radii for these Cepheids and two additional Cepheids, delta Cep and eta Aql, previously observed at the NPOI. We find the limb-darkened angular diameters of UMi and of zeta Gem to be 3.28 +/- 0.02 and 1.55+/- 0.09 mas, respectively. Using trigonometric parallaxes, we find the linear radii of alpha UMi, zeta Gem, delta Cep, and eta Aql to be 46 =/- 3, 60(-14)(+25), 45(-6)(+28), and 69(-15)(+28) R., respectively. We compare thepulsation periods and linear radii of this sample of Cepheids, which rangein period from 3 to 11 days, to theoretical and empirical period-radius and period-radius-mass relations found in the literature. Ne find that the observed diameter of a UMi is in excellent agreement with the predicted diameter as determined from both surface brightness techniques and theory only if a UMi is a first-overtone pulsator.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 03:38:58